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
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
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
The purpose of this paper is to reveal the stress distribution characteristic along the full length anchor bolt. Based on the mechanic model set up, the author calculated the anchor mechanism of the full length resin ...The purpose of this paper is to reveal the stress distribution characteristic along the full length anchor bolt. Based on the mechanic model set up, the author calculated the anchor mechanism of the full length resin rock bolt. The stress distribution characteristic is different according to different type of surrounding rock. The conclusion is important to optimize the roadway bolt support design.展开更多
为探究小断面TBM隧洞锚杆支护在地层围岩中的受力特性及支护参数的合理性,依托安徽桐城抽水蓄能电站自流排水洞工程,分别采用岩体力学法和数值模拟法计算得到隧洞Ⅲ类围岩工况下的锚杆内力和围岩位移,并在洞内TBM掘进段紧随TBM选取3个...为探究小断面TBM隧洞锚杆支护在地层围岩中的受力特性及支护参数的合理性,依托安徽桐城抽水蓄能电站自流排水洞工程,分别采用岩体力学法和数值模拟法计算得到隧洞Ⅲ类围岩工况下的锚杆内力和围岩位移,并在洞内TBM掘进段紧随TBM选取3个监测断面,分别采用锚杆应力计和多点位移计监测得到实际工况下的锚杆内力和围岩位移。对3种方法得到的结果进行对比分析后得出:1)数值模拟法和岩土力学法计算得到的轴力值变化趋势相近,均在锚杆中间部位出现轴力最大值,与中性点理论相符,最大轴力值为4.78 k N;2)3种方法得到的围岩位移值变化趋势相似,均在隧洞围岩表面出现位移最大值,在岩层内部围岩位移最小,最大位移为2.03 mm。进一步,与已有关于较大断面隧洞结构受力研究成果对比发现:小断面TBM隧洞的锚杆轴力及围岩变形均较小,锚杆支护作用未得到充分利用,据此提出了延迟、减少或取消小断面TBM隧洞锚杆支护的优化建议。展开更多
文摘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°.
文摘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.
基金support by the National Natural Science Foundation of China (No.51174195)the Fundamental Research Funds for the Central Universities of China (No.2010QNA31)
文摘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.
文摘The purpose of this paper is to reveal the stress distribution characteristic along the full length anchor bolt. Based on the mechanic model set up, the author calculated the anchor mechanism of the full length resin rock bolt. The stress distribution characteristic is different according to different type of surrounding rock. The conclusion is important to optimize the roadway bolt support design.
文摘为探究小断面TBM隧洞锚杆支护在地层围岩中的受力特性及支护参数的合理性,依托安徽桐城抽水蓄能电站自流排水洞工程,分别采用岩体力学法和数值模拟法计算得到隧洞Ⅲ类围岩工况下的锚杆内力和围岩位移,并在洞内TBM掘进段紧随TBM选取3个监测断面,分别采用锚杆应力计和多点位移计监测得到实际工况下的锚杆内力和围岩位移。对3种方法得到的结果进行对比分析后得出:1)数值模拟法和岩土力学法计算得到的轴力值变化趋势相近,均在锚杆中间部位出现轴力最大值,与中性点理论相符,最大轴力值为4.78 k N;2)3种方法得到的围岩位移值变化趋势相似,均在隧洞围岩表面出现位移最大值,在岩层内部围岩位移最小,最大位移为2.03 mm。进一步,与已有关于较大断面隧洞结构受力研究成果对比发现:小断面TBM隧洞的锚杆轴力及围岩变形均较小,锚杆支护作用未得到充分利用,据此提出了延迟、减少或取消小断面TBM隧洞锚杆支护的优化建议。
