Mechanical properties and reinforcement effect of jointed rock mass with pre-stressed bolt
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Mechanical properties and reinforcement effect of jointed rock mass with pre-stressed bolt YANG Wen-dong(杨文东), LUO Guang-yu(罗光宇), BO Chun-jie(薄纯杰), WANG Ling(王令), LÜ Xian-xian(吕显先), WANG Ying-nan(王英男), WANG Xue-peng(王学鹏) College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: Pre-stressed bolt anchorage is the key technology for jointed rock masses in rock tunnelling, slope treatment and mining engineering. To investigate the mechanical properties and reinforcement effect of jointed rock masses with pre-stressed bolts, in this study, uniaxial compression tests were conducted on specimens with different anchoring types and flaw inclination angles. ABAQUS software was used to verify and supplement the laboratory tests. The laws of the uniaxial compressive strength (UCS) obtained from the numerical simulations and laboratory tests were consistent. The results showed that under the same flaw angle, both the UCS and elastic modulus of the bolted specimens were improved compared with those of the specimens without bolts and the improvements increased with an increase in the bolt pre-stress. Under the same anchoring type, the UCS and elastic modulus of the jointed specimens increased with an increase in the flaw angle. The pre-stressed bolt could not only restrain the slip of the specimens along the flaw surface but also change the propagation mode of the secondary cracks and limit the initiation of cracks. In addition, the plot contours of the maximum principal strain and the Tresca stress of the numerical models were influenced by the anchoring type, flaw angle, anchoring angle and bolt position. Key words: jointed rock mass; pre-stressed bolt; laboratory test; numerical simulation Cite this article as: YANG Wen-dong, LUO Guang-yu, BO Chun-jie, WANG Ling, LÜ Xian-xian, WANG Ying-nan, WANG Xue-peng. Mechanical properties and reinforcement effect of jointed rock mass with pre-stressed bolt [J]. Journal of Central South University, 2020, 27. DOI: https://doi.org/10.1007/s11771-020-4469-9.
1 Introduction A rock mass is characterized by a long geological history and is affected by tectonism, weathering and other factors, resulting in the presence of many holes, fissures and joints in the rock mass. These discontinuities develop under the action of a load and make the mechanical properties and failure forms of the rock mass change [1−8]. Bolt support is one of the most effective and common support means for jointed rock masses
[9−13]. It has the advantages of a convenient construction, a high adaptability and a low cost and has been widely applied to rock tunnelling, slope treatment and mining engineering since its first application in 1913 [14−16]. Pre-stressed bolts expanded the application scope and scale of bolt support and became the key technology in anchorage engineering [17−19], as they can actively provide the support resistance, obviously improve the shear strength of th
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