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Study on Asymmetric Deformation Law and Surrounding Rock Control Technology of High Stress Soft Rock Crossing Roadway
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作者 Linhao Zhang 《World Journal of Engineering and Technology》 2023年第2期353-369,共17页
In order to solve the problem of asymmetric large deformation of high-stress soft rock crossing roadway under complex geological conditions in deep mines, taking the 2# total return airway of 76.2# section of Wuyang C... In order to solve the problem of asymmetric large deformation of high-stress soft rock crossing roadway under complex geological conditions in deep mines, taking the 2# total return airway of 76.2# section of Wuyang Coal Mine as the engineering background, the causes of asymmetric deformation and failure of soft rock crossing roadway in deep mines were summarized and analyzed by means of field investigation, theoretical analysis and numerical simulation, and the asymmetric high-efficiency support technology with large row spacing was studied. The results show that the lithology of roadway strata is the main cause of asymmetric deformation and failure of roadway. The shape change of roadway is not the main influencing factor of asymmetric deformation of roadway, but for the control of roadway surrounding rock, the straight wall semi-circular arch roadway is better than the rectangular roadway. The field industrial test shows that after adopting the new support design scheme, the displacement of the roof and floor of the roadway is reduced by 86.39% compared with the original support design scheme, and the displacement of the two sides of the roadway is reduced by 86.05% compared with the original support design scheme, which can ensure the normal and safe production of the roadway during the service period, and provide reference for the support design of other similar geological conditions. 展开更多
关键词 Deep high stress soft rock Penetration Asymmetric Deformation Support FLAC3D
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Instability mechanism and control technology of soft rock roadway affected by mining and high confined water 被引量:12
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作者 Li Guichen Jiang Zuohan +3 位作者 Lv Chuangxin Huang Chao Chen Gui Li Mingyuan 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2015年第4期573-580,共8页
Based on deformation and failure characteristics of the second belt conveyor roadway at level II of Zhuxianzhuang coal mine, laboratory experiments, numerical calculation and field test were adopted to analyze the com... Based on deformation and failure characteristics of the second belt conveyor roadway at level II of Zhuxianzhuang coal mine, laboratory experiments, numerical calculation and field test were adopted to analyze the composition and microstructure of mudstone, the law of mudstone hydration and its strength weakening induced by water, the characteristics of surrounding rock deformation and failure under the action of confined water. Results showed that montmorillonite clay minerals accounted for as much as 76% of mudstone, with a large number of pores existing in the microstructure. Besides, as the molecular structure of montmorillonite changed, mudstone microstructure damage occurred with the macroscopic manifestation of its theological instability. Weakening degree of confined water on residual strength of mudstone was almost 50%. The instability mechanism of soft rock roadway caused by high confined water is that surrounding rock circulates the process of "fracture-seepage-mud ding-closed" twice, which weakens its strength and leads to roadway instability. A combined support technology, namely the, "high-toughness sealing layer + hollow grouting cables + full-length anchoring bolts with deep borehole" was proposed. Based on field observation, the soft rock roadway was controlled effectively, which also verified the effectiveness of new control technology for surrounding rock. 展开更多
关键词 high confined water soft rock roadway Instability mechanism Control technology
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Principle and practice of coupling support of double yielding shell of soft rock roadway under high stress 被引量:10
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作者 Li Chong Wang Zhongliang Liu Tao 《International Journal of Mining Science and Technology》 SCIE EI 2014年第4期513-518,共6页
In order to ensure the safety and stability of the soft rock roadway under high stress, based on the char- acteristics of the surrounding rock deformation and failure, this paper presented the support technology“coup... In order to ensure the safety and stability of the soft rock roadway under high stress, based on the char- acteristics of the surrounding rock deformation and failure, this paper presented the support technology“coupling support of double yielding shell”, then gave the design method of inner and outer shells and analyzed the principle and requirements of the support technology by taking the -850 meast belt mad-way of Qujiang coal mine as the background. The field application results show that the support technol- ogy can control the soft rock roadway deformation better under high stress. The displacement between roadway sides was 851 mm, the displacement of the roof was 430 mm, and the displacement of the floor was 510 mm. 展开更多
关键词 high stress soft rock roadway Yielding shell Reticulated shell Short bolting
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Failure mechanism and control technology of water-immersed roadway in high-stress and soft rock in a deep mine 被引量:11
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作者 Yang Renshu Li Yongliang +3 位作者 Guo Dongming Yao Lan Yang Tongmao Li Taotao 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2017年第2期245-252,共8页
Aiming at soft rock ground support issues under conditions of high stress and long-term water immersion, the ground failure mechanism is revealed by taking the deep-water sumps of Jiulong Mine as the engineering backg... Aiming at soft rock ground support issues under conditions of high stress and long-term water immersion, the ground failure mechanism is revealed by taking the deep-water sumps of Jiulong Mine as the engineering background and employing field investigation, tests of rock structure, mechanical properties and mineral composition. The main factors leading to the surrounding rock failure include the high and complex stress state of the water sumps, high-clay content and water-weakened rock, and the unreasonable support design. In this paper, the broken and fractured rock mass near roadway opening is considered as ground small-structure, and deep stable rock mass as ground large-structure. A support technology focusing on cutting off the water, strengthening the small structure of the rock and transferring the large structure of the rock is proposed. The proposed support technology of interconnecting the large and small structures, based on high-strength bolts, high-stiffness shotcrete layer plugging water,strengthening the small structure with deep-hole grouting and shallow-hole grouting, highpretensioned cables tensioned twice to make the large and small structures bearing the pressure evenly,channel-steel and high-pretensioned cables are used to control floor heave. The numerical simulation and field test show that this support system can control the rock deformation of the water sumps and provide technical support to similar roadway support designs. 展开更多
关键词 high stress and soft rock Water immersion Failure mechanism Large and small structures Rework control
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An experimental study of a yielding support for roadways constructed in deep broken soft rock under high stress 被引量:7
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作者 Lu Yinlong Wang Lianguo Zhang Bei 《Mining Science and Technology》 EI CAS 2011年第6期839-844,共6页
A rationally designed support for deep roadways excavated in broken soft rock under high stress was investigated. The deformation and failure characteristics and the mechanism of ''yielding support'' w... A rationally designed support for deep roadways excavated in broken soft rock under high stress was investigated. The deformation and failure characteristics and the mechanism of ''yielding support'' was studied for anchor bolts and cables. The rail roadway of the 2-501 working face in the Liyazhuang Mine of the Huozhou coal area located in Shanxi province was used for field trials. The geological conditions used there were used during the design phase. The new ''highly resistant, yielding'' support system has a core of high strength, yielding bolts and anchor cables. The field tests show that this support system adapts well to the deformation and pressure in the deep broken soft rock. The support system effectively controls damage to the roadway and ensures the long term stability of the wall rock and safe production in the coal mine. This provides a remarkable economic and social benefit and has broad prospects for fur- ther application. 展开更多
关键词 high stress Broken soft rock roadways Yielding support Yielding anchor bolt
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The principle of stability control of surrounding rock-bearing structures in high stress soft rock roadways 被引量:2
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作者 WANG Wei-jun ZHU Yong-jian LI Shu-qing ZHANG Peng 《Journal of Coal Science & Engineering(China)》 2009年第1期24-27,共4页
Through the description of the deformational features of the surrounding rockaround high stress engineering soft rock roadways,the coupling stabilization principle ofinner and outer structures in surrounding rock was ... Through the description of the deformational features of the surrounding rockaround high stress engineering soft rock roadways,the coupling stabilization principle ofinner and outer structures in surrounding rock was put forward.The supporting principlesof high stress engineering soft rock roadway (high resistance and yielding support,timelysupport,high strength and high stiffness supports) were proposed,which were applied inengineering practices,and obtained better achievements. 展开更多
关键词 high stress engineering soft rock mass inner and outer structures high resistance and yielding support timely support
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Engineering study on roadway support in high-stress composite soft rock
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作者 贾明魁 程东泉 《Journal of Coal Science & Engineering(China)》 2003年第1期42-46,共5页
The present study is focused on the roadway support in high stress composite soft rock. This paper expounds the two main features of roadway in soft rock, i.e., great deformation of surrounding rock and remarkable rhe... The present study is focused on the roadway support in high stress composite soft rock. This paper expounds the two main features of roadway in soft rock, i.e., great deformation of surrounding rock and remarkable rheological deformation. Furthermore, on the basis of analyzing physico chemical component of surrounding rock and the situation of the damaged roadway, the method of adopting strong bolting and shotcreting mesh for the primary support, bolting and grouting for the secondary support is put forward in light of the on the spot investigation of stress tension, mechanical parameter and engineering geology. The application reveals the method facilitates the continuation of west main roadway and the restoration of shaft station and chambers. Consequently, better techno economic results have been achieved. 展开更多
关键词 high stress composite soft rock roadway strong force bolting and shotcreting mesh bolting and grouting
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Failure mechanism of bolting support and high-strength bolt-grouting technology for deep and soft surrounding rock with high stress 被引量:16
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作者 李术才 王洪涛 +5 位作者 王琦 江贝 王富奇 郭念波 刘文江 任尧喜 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第2期440-448,共9页
In deep underground mining, the surrounding rocks are very soft with high stress. Their deformation and destruction are serious, and frequent failures occur on the bolt support. The failure mechanism of bolt support i... In deep underground mining, the surrounding rocks are very soft with high stress. Their deformation and destruction are serious, and frequent failures occur on the bolt support. The failure mechanism of bolt support is proposed to solve these problems. A calculation theory is established on the bond strength of the interface between the anchoring agent and surrounding rocks. An analysis is made on the influence law of different mechanical parameters of surrounding rocks on the interfacial bond strength. Based on the research, a new high-strength bolt-grouting technology is developed and applied on site. Besides, some helpful engineering suggestions and measures are proposed. The research shows that the serious deformation and failure, and the lower bond strength are the major factors causing frequent failures of bolt support. So, the bolt could not give full play to its supporting potential. It is also shown that as the integrity, strength, interface dilatancy and stress of surrounding rocks are improved, the bond strength will increase. So, the anchoring force on surrounding rocks can be effectively improved by employing an anchoring agent with high sand content, mechanical anchoring means, or grouting reinforcement. The new technology has advantages in a high strength, imposing pre-tightening force, and giving full play to the bolt supporting potential. Hence, it can improve the control effect on surrounding rocks. All these could be helpful references for the design of bolt support in deep underground mines. 展开更多
关键词 high stress soft rock bolting support interface dilation failure mechanism high strength bolt-grouting technology
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Study on mechanism and practice of surrounding rock control of high stress coal roadway
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作者 王卫军 杨磊 欧阳广斌 《Journal of Coal Science & Engineering(China)》 2006年第2期6-10,共5页
The mechanical principle and surrounding rock deformation feature of highstress coal roadway was analyzed.The condition of stress balance of the kind of theroadway was put forward.The surrounding rock control principl... The mechanical principle and surrounding rock deformation feature of highstress coal roadway was analyzed.The condition of stress balance of the kind of theroadway was put forward.The surrounding rock control principle and supporting techniqueof high stress coal roadway were discussed.It was very important to control early daysdeformation of coal sides.The supporting strength is should increased,so the strengthloss of coal sides is decreased.The range of plastic fluid zone is reduced.The abovemention-ned principle is applied in industrial test,and the new supporting technique is ap-plied successfully. 展开更多
关键词 high stress coal roadway surrounding rock control
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Bolt-grouting combined support technology in deep soft rock roadway 被引量:12
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作者 Chen Yanlong Meng Qingbin +2 位作者 Xu Guang Wu Haoshuai Zhang Guimin 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第5期777-785,共9页
Analyzing the mineral composition, mechanical properties and ground stress testing in surrounding rock,the study investigated the failure mechanism of deep soft rock roadway with high stress. The boltgrouting combined... Analyzing the mineral composition, mechanical properties and ground stress testing in surrounding rock,the study investigated the failure mechanism of deep soft rock roadway with high stress. The boltgrouting combined support system was proposed to prevent such failures. By means of FLAC3D numerical simulation and similar material simulation, the feasibility of the support design and the effectiveness of support parameters were discussed. According to the monitoring the surface and deep displacement in surrounding rock as well as bolt axial load, this paper analyzed the deformation of surrounding rock and the stress condition of the support structure. The monitor results were used to optimize the proposed support scheme. The results of field monitors demonstrate that the bolt-grouting combined support technology could improve the surround rock strength and bearing capacity of support structure, which controlled the great deformation failure and rheological property effectively in deep soft rock roadway with high stress. As a result, the long term stability and safety are guaranteed. 展开更多
关键词 Deep soft rock roadway Bolt-grouting support Numerical simulation Similar material simulation high stress
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Deformation mechanism of high-stress and broken-expansion surrounding rock and supporting optimization based on the gray correlation theory 被引量:6
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作者 余伟健 WANG Ping DU Shao-hua 《Journal of Chongqing University》 CAS 2014年第3期99-114,共16页
Aiming at the large deformation and support problems of high-stress and broken-expansion surrounding rock, and taking 1 000 m level roadway of Mine II in Jinchuan as the research object, an investigation on the deform... Aiming at the large deformation and support problems of high-stress and broken-expansion surrounding rock, and taking 1 000 m level roadway of Mine II in Jinchuan as the research object, an investigation on the deformation and damage of roadway surrounding rock and an analysis of its mechanism were carried out. The gray correlation theory was used in support scheme optimization design. First, causes and mechanism of deformation of the 1 000 m horizontal transport channel were analyzed through field investigation, laboratory test and data processing methods. We arguued that poor engineering geological conditions and deep pressure increases were the main factors, and the deformation mechanism was mainly the ground deformation pressure. Second, the gray correlation theory was used to construct supporting optimization decision method in the deep roadway. This method more comprehensively considers various factors, including construction, costs, and supporting material functions. The combined support with pre-stressed anchor cables, shotcrete layer, bolt and metal net was put forward according to the actual roadway engineering characteristics. Finally, 4 support schemes were put forward for new roadways. The gray relational theory was applied to optimizing the supporting method, undertaking technical and economic comparison to obtain the correlation degree, and accordingly the schemes were evaluated. It was concluded as follows: the best was the flexible retaining scheme using the steel strand anchor; the second best was the one using plate anchors on the top and rigid common screw steel bolt on the two sides; the ttiird was; the rigid common screw steel bolt in full section of roadway; and the worst is the planished steel rigid support. The optimized scheme was applied to the 1000 m level of new excavation roadway. The results show that the roadway surrounding rock can reach a stable state after 5 to 6 months monitoring, with a convergence rate less than 1 mm/d. 展开更多
关键词 deep high stress broken-expansion surrounding rock deformation and failure of roadways gray correlation theory
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Mechanism of rock deformation and failure and monitoring analysis in water-rich soft rock roadway of western China 被引量:4
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作者 MENG Qing-bin HAN Li-jun +2 位作者 QIAO Wei-guo LIN Deng-ge YANG Ling 《Journal of Coal Science & Engineering(China)》 2012年第3期262-270,共9页
Aiming to get the strata behavior and stability rules of surrounding rock of the main return airway of Yushujing Coal Mine, convergence deformation of two sides and force of U-shaped steel yieldable support and bolt w... Aiming to get the strata behavior and stability rules of surrounding rock of the main return airway of Yushujing Coal Mine, convergence deformation of two sides and force of U-shaped steel yieldable support and bolt were monitored, and deformation of surrounding rock and mechanical characteristics of support structure were timely obtained to guide the informa- tion construction and optimize supporting parameters in water-rich soft rock roadway. The field monitoring results indicate the following. (1) Convergence displacement of rock surface increases with time continuity and shows surrounding rock's intense theological behavior. The original support scheme cannot control the large deformation and strongly theological behavior; (2) Without backfilling, the U-shaped steel support begins to bear load after erecting for 4-7 days and increases rapidly in the first 30 days. The U-shaped steel support at the right shoulder and top of roadway bears a larger force and the left side and shoulder bears a smaller force; (3) The stress of bolt increasing over time and at the right shoulder of roadway has larger growth and value. The mechanism of rock deformation and the failure and strata behavior in water-rich soft rock roadway are revealed based on the results of the measured relaxation zone of surrounding rock, measured stresses, and the rock mechanics tests. 展开更多
关键词 mining engineering soft rock roadway site monitoring DEFORMATION fracture mechanism
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Optimization of construction scheme and supporting technology for HJS soft rock tunnel 被引量:8
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作者 Wang Shuren Li Chunliu +1 位作者 Liu Zhaowei Fang Junbo 《International Journal of Mining Science and Technology》 SCIE EI 2014年第6期847-852,共6页
For a soft rock tunnel under high stress in jointed and swell soft rock (HJS), two construction schemes pilot-tunneling enlarging excavation and step-by-step excavation were optimized using FLAC20, and the deformati... For a soft rock tunnel under high stress in jointed and swell soft rock (HJS), two construction schemes pilot-tunneling enlarging excavation and step-by-step excavation were optimized using FLAC20, and the deformation effects of the two construction schemes were verified by field tests. Based on engineer- ing geological investigation and mechanical analysis of large deformations, the complex deformation mechanisms of stress expansion and structural deformation of the soft rock tunnel were confirmed, and support countermeasures from the complex deformation mechanism converted to a single type were proposed, and the support parameters were optimized by field tests. These technologies were proved by engineering practice, which produced significant technical and economic benefits. 展开更多
关键词 soft rock tunnel high stress Deformation mechanism Support parameters Optimization
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Study on the Deformation Mechanism of a Soft Rock Tunnel
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作者 Jianhui Yang Kai Shen +2 位作者 Shoudong Pan Shuren Wang Zhengsheng Zou 《Fluid Dynamics & Materials Processing》 EI 2022年第2期243-255,共13页
The large deformation of soft rock tunnel is one of the key problems to be overcome in the tunnel construction stage.In the present study,the deformation mechanism of a representative tunnel and some related counterme... The large deformation of soft rock tunnel is one of the key problems to be overcome in the tunnel construction stage.In the present study,the deformation mechanism of a representative tunnel and some related countermeasures are investigated using field tests and engineering geological analysis.Owing to the scarce performances of methods based on other criteria such as small pipe spacing,anchor bolt length and steel frame spacing,a new support scheme is implemented and optimized.Results show that shear failure and bedding sliding are produced under high horizontal stress conditions.The low strength of the surrounding rock results in the uneven convergence of both sides of the tunnel.With the aforementioned new support scheme,however,most of such problems can be mitigated leading to good stability properties and ensuing economic advantages. 展开更多
关键词 soft rock tunnel high stress deformation mechanism supporting countermeasure
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Experimental study on stability control technology of surrounding rock of deep roadways in coal mine
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作者 Luo Yong Yuan Liang Yang Yang 《Engineering Sciences》 EI 2014年第2期12-21,共10页
In order to solve effectively the problems of deep mining with safety and high efficiency, the multi- pie factors influencing the stability of deep rock roadway and technical problems are analyzed in the light of the ... In order to solve effectively the problems of deep mining with safety and high efficiency, the multi- pie factors influencing the stability of deep rock roadway and technical problems are analyzed in the light of the severe situation of effective mining for deep coal resource, and the stability control methods for deep rock road- way are provided, which are based on the idea of combined support with separated steps and integral control of surrounding rock of deep rock roadway. The suggested methods were applied to a deep rock roadway with -648 m depth in Gubei coal mine of Huainan area. The field test was carried out and the in-situ monitoring was imple- mented, and the support scheme was optimized and adjusted to improve the stability of the surrounding rock of the roadway based on the feedback analysis. The results showed that the stability can be improved greatly by the provided control methods tbr deep roadway. The present methods lbr stability control of deep rock roadway can be used to other deep rock roadways with the similar conditions. 展开更多
关键词 deep rock roadway mining with safety and high efficiency STABILITY in-situ monitoring softrock
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极高地应力软岩隧道非对称变形机理及支护优化研究 被引量:2
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作者 陈志敏 赵吉万 +3 位作者 龚军 陈宇飞 李增印 孙胜旗 《防灾减灾工程学报》 CSCD 北大核心 2024年第1期109-119,共11页
针对极大断面公路隧道施工中出现的非对称大变形问题,考虑高地应力第一主应力与隧道轴线关系、层状软岩夹层与互层状态、掌子面软岩空间不对称、地下水等因素,基于对工程地质条件、围岩与支护结构失效及破坏特征的分析,结合岩样物理力... 针对极大断面公路隧道施工中出现的非对称大变形问题,考虑高地应力第一主应力与隧道轴线关系、层状软岩夹层与互层状态、掌子面软岩空间不对称、地下水等因素,基于对工程地质条件、围岩与支护结构失效及破坏特征的分析,结合岩样物理力学特性室内试验研究及地应力实测情况,探究了非对称大变形形成机理并提出针对性的支护结果优化方案。结果表明:高地应力层状软岩隧道围岩不对称变形是在岩层倾角α、最大水平主应力与隧道轴线夹角β和岩层夹角γ、围岩岩性和地下水综合作用下的大变形,围岩不对称部位由以上几种因素共同决定;当主应力σ1与隧道轴线既不垂直也不平行时,会产生挤压性偏压构造水平地应力,使隧道横断面侧向受力不对称,发生偏压性非对称大变形;通过改变锚杆的布设方式、提高超前注浆小导管的长度和刚度、喷射临时封闭、在防水板与喷射砼间增加高密度橡塑海绵板缓冲层等措施,可以有效的减少变形量,防止围岩因开挖扰动而松动和坍塌。 展开更多
关键词 极高地应力 软岩隧道 非对称变形 支护优化
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深部极松软围岩沿空巷道稳定性控制及应用
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作者 袁安营 田鑫 +1 位作者 李唐 徐超凡 《煤炭工程》 北大核心 2024年第4期36-44,共9页
针对深部高应力作用下极松软围岩变形量大、破碎程度高、巷道难支护等问题,以丁集煤矿1232(3)沿空巷道为工程背景,采用数值模拟、现场监测和井下试验相结合的方法,对深部高应力极松软围岩沿空巷道破坏特征及阶段性控制原理和技术进行研... 针对深部高应力作用下极松软围岩变形量大、破碎程度高、巷道难支护等问题,以丁集煤矿1232(3)沿空巷道为工程背景,采用数值模拟、现场监测和井下试验相结合的方法,对深部高应力极松软围岩沿空巷道破坏特征及阶段性控制原理和技术进行研究。结果表明:随着距巷道迎头距离的不断增大,巷道两帮应力的不对称性逐渐增大,实体煤侧应力峰值为37.18 MPa大于煤柱侧35.21 MPa,1242(3)终采线50 m范围内存在应力集中,最大达33 MPa,巷道围岩塑性区发育程度为煤柱帮大于实体煤帮大于顶底板;从巷道掘进过程中所经历的复杂围岩变化过程,将全巷道划分为5种典型的围岩变化阶段来分析围岩变形破坏特征和破坏机理,揭示了在高应力作用下深部软岩沿空巷道围岩变形量大,在空间上呈现出明显的区域性和非对称性的特征;基于巷道初步设计方案和围岩变形破坏特征,及时有效的调整支护方案,对巷道进行分段式、非对称、区域化综合治理,形成深部软岩巷道围岩控制长效机制,为同类型深部软岩巷道地压治理提供了理论和技术支撑。 展开更多
关键词 深部高应力 极松软围岩 沿空巷道 围岩控制 阶段性支护
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高地应力缓斜半煤岩巷道断面形状优化研究
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作者 王志强 尹安然 +2 位作者 李敬凯 柴虎虎 王燕飞 《煤炭工程》 北大核心 2024年第1期105-112,共8页
为了优化高地应力缓斜半煤岩巷道的断面形状,以东欢坨矿3018工作面运道为工程背景展开研究。通过复变函数理论推导得出了倾斜煤层中不同断面形状的应力解析解,然后运用FLAC3D数值模拟求解了不同断面形状巷道的应力集中和塑性区情况,并... 为了优化高地应力缓斜半煤岩巷道的断面形状,以东欢坨矿3018工作面运道为工程背景展开研究。通过复变函数理论推导得出了倾斜煤层中不同断面形状的应力解析解,然后运用FLAC3D数值模拟求解了不同断面形状巷道的应力集中和塑性区情况,并以此为基础确定了巷道最优断面形状,最后结合现场工业性试验对研究结果的可靠性进行了验证。研究结果表明:高地应力作用下缓斜半煤岩巷道破坏呈现非对称形式;不管断面形状如何,巷道均在左、右两底角处呈现高应力集中,且应力集中程度矩形>梯形>直墙拱形;直墙拱形巷道稳定性最佳,梯形巷道次之,矩形稳定性最差,确定直墙拱形为最终巷道断面形状;现场巷道表面位移量监测结果表明,直墙拱形巷道更能满足现场安全生产要求。 展开更多
关键词 高地应力 缓斜半煤岩巷道 巷道断面形状 复变函数
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复杂破碎巷道支护难度分级方法研究与应用
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作者 李德贤 王文杰 +2 位作者 黄永祥 张鹏强 朱文韬 《金属矿山》 CAS 北大核心 2024年第9期51-57,共7页
为解决复杂破碎巷道支护方式选取缺乏定量化方法和标准、支护效果不稳定等难题,以金川三矿区为例,基于灾变耦合原理得到巷道变形破坏耦合路径,选取岩石强度应力比、矿岩破碎系数及岩体结构等级作为巷道支护难度评价指标,利用改进的LEC... 为解决复杂破碎巷道支护方式选取缺乏定量化方法和标准、支护效果不稳定等难题,以金川三矿区为例,基于灾变耦合原理得到巷道变形破坏耦合路径,选取岩石强度应力比、矿岩破碎系数及岩体结构等级作为巷道支护难度评价指标,利用改进的LEC分级评价方法提出了巷道支护难度分级方法,将支护难度划分为Ⅰ~Ⅳ级。根据所提支护难度分级方法对该矿1 438 m分段进行了快速分级,并依据不同分级结果采取了对应的支护策略,支护效果良好。研究表明:所提巷道支护难度分级方法能够快速实现复杂破碎巷道支护级别分类,具有较高可靠性,为实现巷道安全、经济支护目标提供了技术支撑。 展开更多
关键词 分级支护 复杂巷道 破碎岩体 围岩变形 高地应力
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采动应力作用巷道交岔点稳定性分析及支护优化
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作者 刘小虎 查文华 +3 位作者 姚直书 赖斯祾 黄仁贵 梁译文 《煤炭技术》 CAS 2024年第7期14-19,共6页
深部软岩巷道交岔点稳定性控制是地下开采的难题,采区内巷道交岔点受采动应力作用更易发生变形破坏。针对该问题,依托805工作面下伏西二回风巷道交岔点工程背景进行研究,建立考虑工作面采动集中应力影响的巷道交岔点垂直应力计算式,采... 深部软岩巷道交岔点稳定性控制是地下开采的难题,采区内巷道交岔点受采动应力作用更易发生变形破坏。针对该问题,依托805工作面下伏西二回风巷道交岔点工程背景进行研究,建立考虑工作面采动集中应力影响的巷道交岔点垂直应力计算式,采用数值计算方法分析不同采动应力集中系数、不同交岔角度下交岔点围岩应力及塑性区分布规律。得知随着采动应力集中系数增大,交岔点岩柱应力集中现象加剧、围岩塑性区发育范围增大、交岔点变形破坏加剧。基于上述分析,提出以全长预应力锚杆+锚索+围岩注浆的综合化主动支护方法。结合矿压监测,优化后支护效果良好。研究结果为类似采动应力影响下的巷道交岔点围岩稳定性控制提供技术参考。 展开更多
关键词 深部软岩 巷道交岔点 采动应力 支护加固设计 矿压监测
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