Mechanical response characteristics of persistent joint planes in tunnel surrounding rock masses with grouting treatments
WANG Jiansheng1, JIANG Zhibin2, LI Lichao2
1.Jiqing High Speed Railway Co., Ltd., Jinan 250100, Shandong, China; 2.College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
Abstract In order to study the influence of grouting reinforcement on the shear strength of the persistent joint planes, the nonpersistent jointed rock samples were sheared to be failed for preparing the persistent joint plane samples. The direct shear tests on grouting reinforced rock mass were carried out to explore the failure characteristics and mechanical properties of them. The results showed that the failure modes of rock mass after grouting treatments could be divided into three types: grouted plane shearing failure, intact rock material failure and grout consolidation failure. The failure modes were mainly affected by the strength of grouted plane, grout consolidation and rock material. The water cement ratio mainly affected the strength of the grout consolidation and the bond strength of the grouted surface. The filling thickness mainly affected the bonded strength of the grouted surface. Through grouting treatments, the cohesion of rock joint surface was significantly improved, while the internal friction angle was rarely affected. The initial failure of non-persistent jointed rock mass had an impact on the effect of grouting treatments. The strength improvement of grouting reinforcement on tension-induced failure planes was better than that on shear-induced ones.
WANG Jiansheng,JIANG Zhibin,LI Lichao. Mechanical response characteristics of persistent joint planes in tunnel surrounding rock masses with grouting treatments[J]. Hazard Control in Tunnelling and Underground Engineering,
2023, 5(2): 80-88.
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