Study on shear mechanical properties of structural planes grouted with different materials
LU Haifeng1，2，ZHU Chendong1，LIU Quansheng1，2
(1. School of Civil Engineering，Wuhan University，Wuhan，Hubei 430072，China；2. Key Laboratory of Geotechnical and Structural Safety Engineering of Hubei Province，Wuhan University，Wuhan，Hubei 430072，China)
Abstract：Grouting technology is a common reinforcement method for fractured rock mass. Grouting effect on rock mass is mainly reflected in the influence on mechanical properties of structural planes，and different grouting materials have different reinforcement effects and mechanisms. Taking red sandstone as the research object，the structural plane is made by splitting method，and the cement and the epoxy resin are selected for grouting materials. The direct shear tests under different normal pressures are carried out. The shear test results are compared with those of non grouting structural planes，and the shear mechanical properties are analyzed. The 3D scanner is used to scan the structural planes before and after shearing. Based on the calculation formula of the effective shearing angle and the root mean square slope Z2，the roughness of the structural planes before and after shearing is evaluated by using the analysis software，and the influence of grouting on the three-dimensional morphological characteristics of the structural planes is analyzed. The test results show that grouting can increase the cohesion between the structural planes，and change the three-dimensional morphology of the structural planes，so as to increase the shear strength. It is also shown that the mechanical properties of different grouting materials are different. Epoxy grouting material has a prominent effect on structural plane reinforcement，while cement grouting material has a significant effect at low normal stress level.
卢海峰1，2，朱晨东1，刘泉声1，2. 不同注浆材料作用下结构面剪切力学特性研究[J]. 岩石力学与工程学报, 2021, 40(9): 1803-1811.
LU Haifeng1，2，ZHU Chendong1，LIU Quansheng1，2. Study on shear mechanical properties of structural planes grouted with different materials. , 2021, 40(9): 1803-1811.
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2021, Vol. 40 
