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Stability of inner dump slope under coal pillar support:case study in an open‑pit coal mine 被引量:4
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作者 Guanghe Li Xiaoxu Yang +2 位作者 Dong Wang Yanting Wang Xiangyu Yu 《International Journal of Coal Science & Technology》 EI CAS CSCD 2022年第2期193-210,共18页
The stability of an inner dump slope was investigated under the efect of coal pillar support considering the development position of dumping.Based on the instability mechanism and load distribution characteristics of ... The stability of an inner dump slope was investigated under the efect of coal pillar support considering the development position of dumping.Based on the instability mechanism and load distribution characteristics of the supporting coal pillar,the three-dimensional mechanical efects of the supporting coal pillar are characterized.Using the two-dimensional equivalent principle and the residual thrust method,the stability of the inner dump slope was analyzed under the efect of pillar support at diferent dump development positions.The quantitative efects of various factors on the inner dump slope stability were revealed,and the coal pillar shape parameters were optimized through numerical simulations.The results indicate that the slope stability coefcient is linearly related to the top width and height of the coal pillar,slope angle,and base inclination angle,and has an exponential relation with the coal pillar strike length and slope height increment.There are quadratic and absolute value relations with the coal pillar outer and the inner bottom angle,respectively.The top width of the coal pillar in the inner dump of Shengli East No.2 open-pit coal mine should be at a level of+824 m,and the optimal top width and height are 15 and 36.7 m,respectively.The instability mechanism of the supporting and retaining coal pillar obtained by numerical simulations and the stability of the inner dump are in good agreement with the theoretical analysis.Our results provide a theoretical basis for the design,treatment,and safe implementation of similar open-pit mine slope engineering. 展开更多
关键词 Inner dump supporting coal pillar slope stability Numerical simulation Morphological parameters
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Time-variant reliability analysis of three-dimensional slopes based on Support Vector Machine method 被引量:4
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作者 陈昌富 肖治宇 张根宝 《Journal of Central South University》 SCIE EI CAS 2011年第6期2108-2114,共7页
In the reliability analysis of slope, the performance functions derived from the most available stability analysis procedures of slopes are usually implicit and cannot be solved by first-order second-moment approach. ... In the reliability analysis of slope, the performance functions derived from the most available stability analysis procedures of slopes are usually implicit and cannot be solved by first-order second-moment approach. A new reliability analysis approach was presented based on three-dimensional Morgenstem-Price method to investigate three-dimensional effect of landslide in stability analyses. To obtain the reliability index, Support Vector Machine (SVM) was applied to approximate the performance function. The time-consuming of this approach is only 0.028% of that using Monte-Carlo method at the same computation accuracy. Also, the influence of time effect of shearing strength parameters of slope soils on the long-term reliability of three-dimensional slopes was investigated by this new approach. It is found that the reliability index of the slope would decrease by 52.54% and the failure probability would increase from 0.000 705% to 1.966%. In the end, the impact of variation coefficients of c andfon reliability index of slopes was taken into discussion and the changing trend was observed. 展开更多
关键词 slope engineering Morgenstern-Price method three dimension support Vector Machine time-variant reliability
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Numerical Analysis of Interaction Between Pile-Supported Pier and Bank Slope 被引量:5
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作者 WANG Nianxiang(王年香) 《China Ocean Engineering》 SCIE EI 2001年第1期117-128,共12页
Two and three-dimensional finite element analysis programs for pile-soil interaction are compiled. Duncan-Chang's Model is used. The construction sequence of the pier is modeled. The pile-soil interface element is... Two and three-dimensional finite element analysis programs for pile-soil interaction are compiled. Duncan-Chang's Model is used. The construction sequence of the pier is modeled. The pile-soil interface element is used. The influence of the combination type of piles on the deformation of bank slope and pile behaviour is analyzed. Different designs of a pile-supported pier are compared thoroughly. Calculation results show that the stresses and displacements of the pile are directly related to the distance from the bank slope and the direction of inclination. An inclined prop pile set in the rear platform would remarkably reduce the stresses of piles and the displacement of the pier. 展开更多
关键词 INTERACTION pile-supported pier bank slope numerical analysis
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Hybrid response surface method for system reliability analysis of pilereinforced slopes
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作者 Xiangrui Duan Jie Zhang +2 位作者 Leilei Liu Jinzheng Hu Yadong Xue 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第9期3395-3406,共12页
To consider the complex soil-structure interaction in a pile-slope system,it is necessary to analyze the performance of pile-slope systems based on a three-dimensional(3D)numerical model.Reliability analysis of a pile... To consider the complex soil-structure interaction in a pile-slope system,it is necessary to analyze the performance of pile-slope systems based on a three-dimensional(3D)numerical model.Reliability analysis of a pile-slope system based on 3D numerical modeling is very challenging because it is computationally expensive and the performance function of the pile failure mode is only defined in the safe domain of soil stability.In this paper,an efficient hybrid response surface method is suggested to study the system reliability of pile-reinforced slopes,where the support vector machine and the Kriging model are used to approximate performance functions of soil failure and pile failure,respectively.The versatility of the suggested method is illustrated in detail with an example.For the example examined in this paper,it is found that the pile failure can significantly contribute to system failure,and the reinforcement ratio can effectively reduce the probability of pile failure.There exists a critical reinforcement ratio beyond which the system failure probability is not sensitive to the reinforcement ratio.The pile spacing affects both the probabilities of soil failure and pile failure of the pile-reinforced slope.There exists an optimal location and an optimal length for the stabilizing piles. 展开更多
关键词 slope PILES System reliability support vector machine Ordinary kriging
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Analysis of Highway Subgrade Slope Protection and Support Technologies
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作者 Zhipan Yang Haonan Ding Shuai Li 《Journal of World Architecture》 2023年第4期1-5,共5页
As an important transportation hub in China,the traffic volume and driving speed are important aspects of expressways.Therefore,the protection requirements for roadbed side slopes are higher,and it is necessary to res... As an important transportation hub in China,the traffic volume and driving speed are important aspects of expressways.Therefore,the protection requirements for roadbed side slopes are higher,and it is necessary to resist rainwater erosion and other damages by protecting the side slopes.Therefore,it is necessary to adopt effective technical means of subgrade protection and support.This paper mainly summarizes the characteristics of highway subgrade slope protection construction and slope protection and support technologies. 展开更多
关键词 EXPRESSWAY Embankment slope PROTECTION support technology
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h型桩加固边坡动力响应特性及破坏模式研究
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作者 代和树 李龙起 《三峡大学学报(自然科学版)》 CAS 北大核心 2025年第1期50-56,共7页
为探究h型桩加固边坡的动力响应及破坏特征,本文以四川康定某铁路沿线堆积体边坡为原型,开展大型振动台模型试验,探究了坡体在多次地震作用下其加速度和频谱响应规律,分析了强震作用下加固边坡的破坏模式及桩身破坏特征.结果表明:随地... 为探究h型桩加固边坡的动力响应及破坏特征,本文以四川康定某铁路沿线堆积体边坡为原型,开展大型振动台模型试验,探究了坡体在多次地震作用下其加速度和频谱响应规律,分析了强震作用下加固边坡的破坏模式及桩身破坏特征.结果表明:随地震荷载强度增大,边坡内部及坡表加速度均沿高程表现出不同程度放大效应;基岩与滑体发生不协调变形,进而导致其傅里叶频谱的响应差异增大;h型桩加固边坡表现出张拉-剪切-滑移式的复合破坏模式;在h型桩支护体系中,h型桩横梁与短桩连接处为薄弱点,1~3号桩体均在此处发生损伤破坏;边缘桩体对内部结构具有支撑和约束作用,降低了内部桩的破坏;相较于传统抗滑桩,h型桩破坏后,其后排桩仍能提供抗滑力,支护体系表现出一定的残余支护能力. 展开更多
关键词 振动台 边坡支护 h型桩 动力响应 破坏模式
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山区斜坡地段桩板墙有效嵌固段分析与应用
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作者 吴泽 《山西建筑》 2025年第3期78-81,共4页
桩板墙常用于空间有限的填方边坡工程中,支护桩的锚固段是按半无限体考虑,但斜坡上桩前的三角体难以形成半无限体的锚固条件,为明确山区斜坡地段桩板墙有效嵌固段,此次研究模拟分析主要采用Madis GTS NX有限元软件进行,通过改变桩前土... 桩板墙常用于空间有限的填方边坡工程中,支护桩的锚固段是按半无限体考虑,但斜坡上桩前的三角体难以形成半无限体的锚固条件,为明确山区斜坡地段桩板墙有效嵌固段,此次研究模拟分析主要采用Madis GTS NX有限元软件进行,通过改变桩前土的坡度,得到桩板墙桩顶水平位移及桩身内力变化趋势:当桩板墙其他条件相同时,桩顶水平位移及桩身内弯矩均随着桩前土体坡度增大同步增加,总结出不同坡度时桩板墙有效嵌固段起算位置,经某实际项目监测成果验证,得出计算数值与监测数值较为相符,验证了计算方法的合理性,可为今后山区斜坡地段桩板墙设计项目提供有益参考。 展开更多
关键词 山区 桩板墙 边坡支护 有限元 斜坡 嵌固段
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Deformation Mechanism and Stability of a Rocky Slope 被引量:4
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作者 黄润秋 肖华波 +1 位作者 巨能攀 赵建军 《Journal of China University of Geosciences》 SCIE CAS CSCD 2007年第1期77-84,共8页
A high slope is located on the side of the spillway at a hydropower station in Southwest China, which has some weak inter-layers inclining outwards. Parts of the slope show heavy weathering and unloading. There appear... A high slope is located on the side of the spillway at a hydropower station in Southwest China, which has some weak inter-layers inclining outwards. Parts of the slope show heavy weathering and unloading. There appeared deformation and tensile crack either on the surface or on the afteredge of the slope during excavation, and under a platform (elev. 488 m), two levels of slopes collapsed on the downriver side. Based on the investigation in situ and the analysis of the geological structure, the conceptual model of deformation and failure mechanism was erected for this slope. Furthermore, the deformation characteristics were studied with FLAC^3D numerical simulation. Comprehensive analysis shows that the whole deformation of the slope is unloading rebound in certain depth scope and the whole body does not slide along any weak interlayer. In addition, two parts with prominent local deformation in the shallow layer of the slope show the models of "creep sfiding-tensile cracking" and "slidlng-tensile cracking", respectively. Based on the above analysis, the corresponding project of support and reinforcement is proposed to make the slope more stable. 展开更多
关键词 high rock slope deformation and failure mechanism STABILITY support
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Cut slope reinforcement technique in open-pit mines 被引量:3
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作者 YongtaoGao JianboSun +1 位作者 ShunchuanWu AibingJin 《Journal of University of Science and Technology Beijing》 CSCD 2004年第4期289-292,共4页
The design and practice in supporting the cut slope of an open-pit mine wereintroduced, in which the high pressure grouting method was used in reinforcing the weak formation inthe slopes. Based on a detailed geologica... The design and practice in supporting the cut slope of an open-pit mine wereintroduced, in which the high pressure grouting method was used in reinforcing the weak formation inthe slopes. Based on a detailed geological survey of the slope, a theoretical analysis was carriedout, and the design parameters were proposed, where the Tresca or Mohr-Coulomb yield criteria wasemployed. A patent technology, named 'Technology of high pressure and multiple grouting in differentlevels within a single hole', was employed in the construction. Anchor bars were also installed asgrouting proceeds. This method combines anchoring and grouting comprehensively and was foundsuccessful in practice. 展开更多
关键词 mining engineering open-pit slope weak formation supporting high pressuregrouting
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Slope RMS在三镜支撑设计与面形评价中的应用
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作者 李明璇 张景旭 +1 位作者 陈宝刚 杨飞 《激光与红外》 CAS CSCD 北大核心 2015年第11期1349-1354,共6页
针对镜面面形均方根(RMS)无法反映表面面形的空间频域特性,借鉴了国际上先进的斜率均方根(Slope RMS)作为面形评价方法。本文以2 m级望远镜三镜作为例子,将Slope RMS作为优化目标函数,计算了支撑点的位置,给出的支撑之后面形误差RMS值为... 针对镜面面形均方根(RMS)无法反映表面面形的空间频域特性,借鉴了国际上先进的斜率均方根(Slope RMS)作为面形评价方法。本文以2 m级望远镜三镜作为例子,将Slope RMS作为优化目标函数,计算了支撑点的位置,给出的支撑之后面形误差RMS值为6.88 nm,在空间间隔为0.25 mm时的Slope RMS值为0.17809μrad。利用Zernike多项式作为面形拟合基底函数,将对成像质量没有影响的刚体位移从面形误差中分离出来,得到最终的面形误差的RMS值为3.30 nm,在空间间隔为0.25 mm时的Slope RMS值为0.15943μrad。研究结果表明,以Slope RMS为目标函数优化支撑点的支撑结果位置满足光学设计的要求,对更大口径光学元件的支撑设计提供了一种指导方法。 展开更多
关键词 斜率均方根 三镜支撑 泽尼克多项式 面形拟合
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Assessing model of highway slope stability based on optimized SVM 被引量:1
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作者 Peng-fei Niu Ai-hong Zhou Hu-cheng Huang 《China Geology》 2020年第2期339-344,共6页
Considering the geological hazards attributed to the highway slope,using a common simple model cannot accurately assess the stability of the slope.First,principal component analysis(PCA)was conducted to extract the pr... Considering the geological hazards attributed to the highway slope,using a common simple model cannot accurately assess the stability of the slope.First,principal component analysis(PCA)was conducted to extract the principal components of six factors(namely,bulk density,cohesion,internal friction angle,slope angle,slope height,and pore water pressure ratio)affecting the slope stability.Second,four principal components were adopted as input variables of the support vector machine(SVM)model optimized by genetic algorithm(GA).The output variable was slope stability.Lastly,the assessing model of highway slope stability based on PCA-GA-SVM is established.The maximal absolute error of the model is 0.0921 and the maximal relative error is 9.21%by comparing the assessment value and the practical value of the test sample.The above studies are conducive to enrich the assessing model of highway slope stability and provide some reference for highway slope engineering treatment. 展开更多
关键词 Highway slope Principal component analysis Genetic algorithm support vector machine STABILITY Geological hazard engineering
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Decision Support Scheme for Lishan Landslide Prewarning System 被引量:1
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作者 Miau Bin Su I Hui Chen 《Journal of Civil Engineering and Architecture》 2011年第8期706-714,共9页
This study combines the analytical model to build a landside monitoring decision support system of the Web GIS. The landslide area of Lishan is a case study for the research. The analysis of the risk degree for the la... This study combines the analytical model to build a landside monitoring decision support system of the Web GIS. The landslide area of Lishan is a case study for the research. The analysis of the risk degree for the landslide area in Lishan is based on the three-layer architecture of Fuzzy Analytic Hierarchical Process (FAHP). There are four fuzzy model structures used in monitoring devices: rainfall, groundwater level, Time Domain Reflectometry (TDR) monitored the subsurface deformation, and Global Positioning System (GPS) monitored ground displacement. These structures are relative to four membership functions that are used to classify four states, including safety, attention, warning, and danger. The risk degree of the landslide area can be obtained through the fuzzy rules by determining management criteria. Calculating the total scores of historical monitoring record of the rainfall, groundwater level, TDR, and GPS through the fuzzy theory can determine the analytical results of risk degrees in Lishan landslide area. In this whole area, management criterion is in the state of attention when the total score is larger than 72, in the state of warning when total score is larger than 95, and in the state of danger when total score is larger than 113. The system provides real-time monitoring data, and prewarning decision support in order to announce and prevent the disaster at the earliest time. 展开更多
关键词 slope monitoring decision support system fuzzy theory Web 3D GIS.
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复杂地质条件下多级高边坡组合支护方案与稳定性预测研究 被引量:4
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作者 焦卫宁 穆日盛 李征 《建筑技术》 2024年第14期1697-1701,共5页
以镇赫高速陈贝屯至煤灰堡段为例,根据工程地质、边坡等级和边坡特性等因素对边坡不同剖面采用衡重式挡墙、俯斜式挡墙、桩+锚索、锚杆+面板等支护形式。从病害原因分析和处治手段出发,研究了多级高边坡支护的质量保证措施。基于LightGB... 以镇赫高速陈贝屯至煤灰堡段为例,根据工程地质、边坡等级和边坡特性等因素对边坡不同剖面采用衡重式挡墙、俯斜式挡墙、桩+锚索、锚杆+面板等支护形式。从病害原因分析和处治手段出发,研究了多级高边坡支护的质量保证措施。基于LightGBM算法建立边坡稳定性预测模型,验证模型精确性后给出预测模型的特征相对重要性结果和预测结果。结果表明:建立预测模型可较好地预测边坡稳定性;影响边坡稳定性最关键的因素为中土体粘聚力,其次为边坡角β,孔隙压力比和土体重度对边坡稳定性影响不大;镇赫高速K2+051~K2+340段边坡稳定概率为0.9,失稳概率为0.1。本项目运营经验表明,组合支护方案及质量保障措施有效提高了项目施工质量、减少了返工现象,保证了项目的经济效益。 展开更多
关键词 边坡支护 多级高边坡 质量保障措施 稳定性预测 LightGBM 混淆矩阵
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高边坡下方管廊基坑支护设计方案比选
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作者 欧孝夺 梁枫 +1 位作者 江杰 白露 《工程勘察》 2024年第4期1-6,12,共7页
人工填土高边坡的坡体稳定性差,因其土体未经压实,开挖极易引起坍塌,对周边建(构)筑物的基坑开挖产生严重的安全隐患。根据人工填土高边坡下南宁凤岭管廊基坑开挖的工程地质条件,分析了基坑设计的难点。对钻孔灌注桩、SMW工法桩、钢板桩... 人工填土高边坡的坡体稳定性差,因其土体未经压实,开挖极易引起坍塌,对周边建(构)筑物的基坑开挖产生严重的安全隐患。根据人工填土高边坡下南宁凤岭管廊基坑开挖的工程地质条件,分析了基坑设计的难点。对钻孔灌注桩、SMW工法桩、钢板桩3种管廊基坑常用的支护形式进行了对比,在综合考虑整体刚度和强度、基坑安全性、费用、施工速度等因素后,最终确定采用具有降低施工成本、可对施工材料重复利用、地下空间资源污染低的SMW工法桩作为该基坑的最佳支护方案。此方案可对今后类似工程的设计施工提供借鉴和参考。 展开更多
关键词 基坑支护 方案比选 高边坡 管廊
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基于GA-PSO混合优化SVR的边坡危岩体稳定性评价模型
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作者 庞俊勇 刘俊 +2 位作者 郑靓婧 李瑶鹤 苏红艳 《金属矿山》 CAS 北大核心 2024年第9期237-244,共8页
边坡危岩体稳定性评价是地质灾害防治的重要内容之一。传统的稳定性评价方法在求解复杂非线性问题时存在着精度较低、收敛速度慢等问题,为此,提出了一种基于GA-PSO混合优化支持向量回归(SVR)的边坡危岩体稳定性评价模型。首先,通过采集... 边坡危岩体稳定性评价是地质灾害防治的重要内容之一。传统的稳定性评价方法在求解复杂非线性问题时存在着精度较低、收敛速度慢等问题,为此,提出了一种基于GA-PSO混合优化支持向量回归(SVR)的边坡危岩体稳定性评价模型。首先,通过采集大量的实测数据和监测数据,建立了边坡危岩体的训练样本集;然后,将SVR算法引入稳定性评价中,利用其非线性映射性能拟合边坡危岩体的稳定性函数。为提高SVR模型的优化能力,将遗传算法(GA)和粒子群优化算法(PSO)相结合,形成了GA-PSO混合优化算法,并用于求解SVR模型中的优化问题。选取了多个现场实际边坡危岩体工程案例进行了算法测试。结果表明:相对于传统方法,GA-PSO混合优化SVR模型能够准确预测边坡危岩体的稳定性,并且具有较高的精度和较快的收敛速度。 展开更多
关键词 边坡危岩体 稳定性评价 支持向量机回归算法 遗传算法 粒子群优化算法
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昆明长水国际机场T2航站楼结构设计关键问题探讨
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作者 周健 蒋本卫 +6 位作者 张耀康 李俊敏 顾乐明 季俊杰 朱铁城 蒋海燕 李建宇 《建筑结构》 北大核心 2024年第22期1-8,27,共9页
昆明长水国际机场T2航站楼面临高填方边坡、高抗震设防烈度、高铁下穿等多项复杂条件,给结构设计带来诸多挑战。在简单介绍T2航站楼结构体系基础上,从场地、隔震、振动控制和钢屋盖等四个方面对结构设计的关键问题进行了探讨,并给出了... 昆明长水国际机场T2航站楼面临高填方边坡、高抗震设防烈度、高铁下穿等多项复杂条件,给结构设计带来诸多挑战。在简单介绍T2航站楼结构体系基础上,从场地、隔震、振动控制和钢屋盖等四个方面对结构设计的关键问题进行了探讨,并给出了解决问题的途径。得出如下结论:复杂场地条件下的地震动参数应通过三维建模条件下的场地地震反应分析确定;高填方边坡在地震下的稳定性应结合拟静力法和时程分析法进行分析;不等标高基底隔震时,隔震层层间位移角限值应以控制罕遇地震下的支座变形为目标来确定;超长结构隔震应采取措施缓解混凝土收缩和温度效应对隔震支座变形的影响;混合使用不同竖向频率的隔振支座解决高铁运行导致的结构振动是可行的;树形柱分枝角度对柱的受力效率影响明显;与大跨屋盖相连的单索幕墙结构可通过自平衡方式减小索拉力对屋盖的作用。 展开更多
关键词 昆明长水国际机场 航站楼 高填方边坡 隔震结构 振震双控 树形柱 索承幕墙
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基于PSO-LSSVM-BP模型的高边坡力学参数反分析及稳定性评价
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作者 徐卫亚 陈世壮 +5 位作者 张贵科 胡明涛 黄威 许晓逸 张海龙 王如宾 《河海大学学报(自然科学版)》 CAS CSCD 北大核心 2024年第5期52-59,共8页
基于粒子群优化(PSO)算法和最小二乘支持向量机(LSSVM)算法构建非线性映射关系,结合反向传播(BP)神经网络对非线性映射关系生成的数据库进行机器学习,构建了PSO-LSSVM-BP模型确定最优岩体力学参数。PSO-LSSVM-BP模型以高边坡监测位移数... 基于粒子群优化(PSO)算法和最小二乘支持向量机(LSSVM)算法构建非线性映射关系,结合反向传播(BP)神经网络对非线性映射关系生成的数据库进行机器学习,构建了PSO-LSSVM-BP模型确定最优岩体力学参数。PSO-LSSVM-BP模型以高边坡监测位移数据作为输入信息,通过反分析获得高边坡岩体力学参数,将反分析参数用于FLAC3D位移数值计算,结果表明模拟结果与监测数据吻合较好,验证了该模型的可行性和有效性。基于PSO-LSSVM-BP模型,对不同蓄水位下两河口水电站进水口高边坡稳定性进行了评价,发现水位是影响边坡稳定性的主要因素,随着水位上升,边坡位移逐渐增大,其表面和断层处损伤程度加深,边坡局部点安全系数有所下降,但整体点安全系数均大于1.30,有一定安全裕度。 展开更多
关键词 高边坡 力学参数反分析 粒子群优化 最小二乘向量机 反向传播神经网络 两河口水电站
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基于混沌粒子群改进支持向量机对露天矿边坡稳定性的分类预测
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作者 赵国彦 邹景煜 王猛 《矿冶工程》 CAS 北大核心 2024年第2期8-12,共5页
为了简便有效地评估边坡稳定性状态,针对目前传统机器学习的算法选择与超参数优化等难题,提出了基于混沌粒子群优化算法的4种机器学习模型,并对其预测性能进行了对比。建立了包含221组露天矿边坡稳定性案例的数据库,其中80%的数据用于训... 为了简便有效地评估边坡稳定性状态,针对目前传统机器学习的算法选择与超参数优化等难题,提出了基于混沌粒子群优化算法的4种机器学习模型,并对其预测性能进行了对比。建立了包含221组露天矿边坡稳定性案例的数据库,其中80%的数据用于训练,20%的数据用于模型测试。4种模型预测结果及工程实例验证结果表明,基于混沌粒子群改进支持向量机模型的预测效果上总体优于其他3种机器学习模型,预测准确率88%,能够有效预测边坡稳定性,可为露天矿边坡安全提供可靠的预测结果。 展开更多
关键词 边坡稳定性 混沌粒子群优化 支持向量机 预测
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圆形抗滑桩-拱形挡土板支挡性能与参数分析
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作者 凌贤长 邢文强 +2 位作者 唐亮 卢凡 丛晟亦 《哈尔滨工程大学学报》 EI CAS CSCD 北大核心 2024年第3期517-525,共9页
为规避当前施工方法的不足,发展安全、高效和可靠的施工方法。依托东北地区某高速铁路路堑边坡工程,采用适于机械钻孔的圆形抗滑桩代替现行矩形抗滑桩,预制拱形挡土板,本文提出一种新型拱形板-桩墙支挡体系;并构建有限元模型,分析桩长... 为规避当前施工方法的不足,发展安全、高效和可靠的施工方法。依托东北地区某高速铁路路堑边坡工程,采用适于机械钻孔的圆形抗滑桩代替现行矩形抗滑桩,预制拱形挡土板,本文提出一种新型拱形板-桩墙支挡体系;并构建有限元模型,分析桩长、桩径、桩间距以及拱形挡土板矢跨比对新型拱形板-桩墙支挡体系支护性能的影响;揭示不同参数下桩顶水平位移与桩身内力的变化规律。研究结果表明:桩长与桩身弯矩和剪力大小呈正相关关系,与桩顶水平位移呈负相关关系。桩长超过14 m时,其对桩顶水平位移、桩身弯矩和剪力的影响效应明显减弱;随着桩间距增大,桩顶水平位移增大但变化幅度逐渐减小。拱形挡土板矢跨比增大时,桩顶水平位移、桩身弯矩和剪力均减小。影响拱形板-桩墙体系支挡性能的因素依次为桩间距、桩长、桩径和矢跨比。研究结果为圆形抗滑桩-拱形挡土板支挡体系在实际工程中的应用提供新思路。 展开更多
关键词 高速铁路 路堑边坡 圆形抗滑桩 拱形挡土板 三维数值模型 正交分析 机械钻孔 支护性能
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大采高综采工作面切顶留巷矸石帮变形控制技术研究
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作者 孙闯 刘义鹏 《煤炭工程》 北大核心 2024年第8期78-85,共8页
为解决厚煤层大采高综采工作面切顶留巷矸石帮围岩控制难题,首先利用理论分析建立了不同挡矸支护条件下矸石帮位移变化的力学公式,以此为基础提出矸石帮变形控制双策略,减弱矸石帮变形压力和增强矸石帮的抗变形能力;其次利用现场实验设... 为解决厚煤层大采高综采工作面切顶留巷矸石帮围岩控制难题,首先利用理论分析建立了不同挡矸支护条件下矸石帮位移变化的力学公式,以此为基础提出矸石帮变形控制双策略,减弱矸石帮变形压力和增强矸石帮的抗变形能力;其次利用现场实验设计两种类别共4组挡矸支护方案,探讨不同支护方案的矸石帮控制效果,验证理论研究成果。结果表明:①增强矸石帮侧顶板支护强度,能减弱矸石帮变形压力;②增架卡兰个数、增加卡兰预紧力、增加卡兰个数、增强U型钢之间的摩擦力等能增加U型钢滑移初始滑移应力,增强矸石帮的抗变形能力;③挡矸支护控制效果为:2副卡兰+单体支柱<2副卡兰+单元支架<2副卡兰+单元支架+呛柱<3副卡兰+单元支架。该研究可为同类条件下切顶留巷矸石帮变形控制提供参考。 展开更多
关键词 厚煤层 切顶留巷 矸石帮 挡矸支护
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