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Parameter analysis of anchor bolt support for large-span and jointed rock mass 被引量:5
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作者 李夕兵 周子龙 +1 位作者 李启月 胡柳青 《Journal of Central South University of Technology》 EI 2005年第4期483-487,共5页
In order to obtain the optimal parameters of anchor bolt supporting system for large-span and jointed rock mass in Kaiyang Phosphor Mine, it is expensive and unavailable with the method of in-situ experiments. This pa... In order to obtain the optimal parameters of anchor bolt supporting system for large-span and jointed rock mass in Kaiyang Phosphor Mine, it is expensive and unavailable with the method of in-situ experiments. This paper describes a numerical modeling with discrete element method for the supporting effects of different type of anchor bolts. The anchor bolts with variant length of 0.5m, 0.8m, 1.0m, diameter of 10mm, 15mm, 20mm, setting spacing of 3.0m, 2.5m, 2.0m, and setting angle of 10°, 20°, 30°, are simulated respectively. The results show that there exist optimal parameters of anchor bolt support for large-span and jointed rock mass. For the bolt support of the concerning, the optimal length is 2.53.5m, the diameter is 2535mm, the spacing is 0.50.6m, and the setting angle is 105°. 展开更多
关键词 jointed rock mass anchor bolt support optimal parameter
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Anchoring mechanism and application of hydraulic expansion bolts used in soft rock roadway floor heave control 被引量:20
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作者 Chang Qingliang Zhou Huaqiang +1 位作者 Xie Zhihong Shen Shiping 《International Journal of Mining Science and Technology》 SCIE EI 2013年第3期323-328,共6页
Comparing with the resin bolt, the hydraulic expansion bolt has different anchoring mechanism and application advantage. According to the working mechanism of the hydraulic expansion bolt, its anchoring force is expre... Comparing with the resin bolt, the hydraulic expansion bolt has different anchoring mechanism and application advantage. According to the working mechanism of the hydraulic expansion bolt, its anchoring force is expressed in four forms including support anchoring force, tension anchoring force, expansion anchoring force and tangent anchoring force, and their values can be obtained on the basis of each calculation formula. Among them, the expansion anchoring force, which is the unique anchoring force of the hydraulic expansion bolt, can provide confining pressure to increase the strength of rock. Aiming at solving the problem of stability control in the soft rock roadway in Jinbaotun Coal Mine which has a double layer of 40 U-type sheds and cannot provide enough resistance support to control floor heave, the study reveals the mechanism of floor heave in the soft rock roadway, and designs the reasonable support parameters of the hydraulic expansion bolts. The observed results of floor convergence indicate that the hydraulic expansion bolts can prevent the development and flow of the plastic zone in the floor rock to control floor heave. Research results enrich the control technology in the soft rock roadway. 展开更多
关键词 Hydraulic expansion bolt anchoring force Soft rock roadway Floor heave Shed support
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Applied on bolting-cable anchor support of full-seam roadway in weaker thick coal seam
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作者 赵庆彪 张生华 郭励生 《Journal of Coal Science & Engineering(China)》 2003年第1期61-66,共6页
The designing method and the supporting mechanism of both bolt and small cable anchor for full seam roadway in the weaker thick coal seam are systematically analyzed, and the construction technology and the supporting... The designing method and the supporting mechanism of both bolt and small cable anchor for full seam roadway in the weaker thick coal seam are systematically analyzed, and the construction technology and the supporting results are briefly summarized. 展开更多
关键词 full seam roadway bolting cable anchor support dynamic monitoring
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High-resistance controlled yielding supporting technique in deep-well oil shale roadways 被引量:3
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作者 Yu Yang Bai Jianbiao +3 位作者 Wang Xiangyu Wang Junde Xue Shizhi Xu Ke 《International Journal of Mining Science and Technology》 SCIE EI 2014年第2期229-236,共8页
In order to avoid the deep-well oil shale roadway being deformed, damaged, or difficult to maintain after excavating and supporting in Haishiwan coal mine, this paper has analyzed the characteristics of the deformed r... In order to avoid the deep-well oil shale roadway being deformed, damaged, or difficult to maintain after excavating and supporting in Haishiwan coal mine, this paper has analyzed the characteristics of the deformed roadway and revealed its failure mechanism by taking comprehensively the methods of field geological investigation, displacement monitoring of surrounding rock, rock properties and hydration properties experiments and field application tests. Based on this work, the high-resistance controlled yielding supporting principle is proposed, which is: to "resist" by high pre-tightening force and high stiff- ness in the early stage, to "yield" by making use of the controlled deformation of a yielding tube in the middle stage, and to "fix" by applying total-section Gunite in the later stage. A high-resistance controlled yielding supporting technique of "high pre-tightening force yielding anchor bolt + small-bore pre-tight- ening force anchor cable + rebar ladder beam + rhombic metal mesh + lagging gunite" has been estab- lished, and industrial on site testing implemented. The practical results show that the high-resistance controlled yielding supporting technique can effectively control the large deformation and long-time rheology of deep-well oil shale roadways and can provide beneficial references for the maintenance of other con-generic roadways.Deep-well Oil shale 展开更多
关键词 Deformation failure mechanism High-resistance controlled yielding supporting Yielding anchor bolt
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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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