【摘 要】
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By means of numerical simulation, the roadway deformation affected by joints was analyzed and the pre-tensioned bolts for reinforcing roadway roof in jointed rock mass was studied. The results show that the roadway roof deformation increases gradually wit
【机 构】
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Key Laboratory of Mine Disaster Prevention and Control, Shandong University of Science and Technolog
论文部分内容阅读
By means of numerical simulation, the roadway deformation affected by joints was analyzed and the pre-tensioned bolts for reinforcing roadway roof in jointed rock mass was studied. The results show that the roadway roof deformation increases gradually with the accretion of joint length, the increase of joint number, the de- crease of intervals, angles and friction angles of joints. The increase is obvious at beginning and then tends slowly. After pre-tensioned bolts are used, roadway roof deformations reduce obviously,and the supporting action of pre-tensioned bolts is more remarkable with accretion of joint length, increasing of joint number, reducing of joint interval, decreasing of joints angle and joint friction angle, and increasing of joint number that bolts drilling through. With comparison of different cases, the joints supporting effect is more remarkable at a small angel.It indicates that the supporting mechanism of pre-tensioned bolts is to reinforce weak faces, such as joints. The more joints the roof includes, the more visible the pre-tensioned bolts strengthening effect is.
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