Experimental research on the shear strength of thinly-infilled rock joints during shearing
XIAO Weimin1，2，YU Huan1，2，LI Rui1，2，JIANG Kun3
(1. School of Civil Engineering，Sichuan Agricultural University，Dujiangyan，Sichuan 611830，China；2. Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction，Sichuan Agricultural University，Dujiangyan，Sichuan 611830，China；3. Dalian Municipal Design and Research Institute Co.，Ltd.，Dalian，Liaoning 116001，China)
Abstract：The shear strengths of thinly-infilled rock joints are different from both clean rock joints and thickly-infilled rock joints. In order to study their shear strength characteristics，fine digitization was performed on five standard profiles proposed by Barton，and on the bases of which rock joint surfaces with standard profile topography were duplicated by using 3D printing technology. Then cement paste was used to prepare rock joints specimens. Quartz sands were adopted as infill to prepare thinly-infilled rock joints with infill thickness to asperity height ratios of 0.0，0.25，0.5，0.75 and 1.00. The laboratory direct shear tests were carried out on and corresponding shear stress vs. shear displacement curves，shear dilation curves and failure properties were obtained，and then the effects of infill thickness to asperity height ratio and joint roughness on the peak shear strength and dilation of thinly-infilled rock joints were analysed. The results indicate that both the peak shear strength and dilation decrease with infill thickness to asperity height ratio and the influence of joint roughness on the peak shear strength also decrease with infill thickness to asperity height ratio. Furthermore，the failure characteristics of thinly-infilled rock joints after shearing were significantly affected by infill thickness to asperity height ratio and joint roughness.
肖维民1，2，余 欢1，2，李 锐1，2，蒋 坤3. 薄层充填岩石节理抗剪强度特性试验研究[J]. 岩石力学与工程学报, 2019, 38(S2): 3420-3428.
XIAO Weimin1，2，YU Huan1，2，LI Rui1，2，JIANG Kun3. Experimental research on the shear strength of thinly-infilled rock joints during shearing. , 2019, 38(S2): 3420-3428.
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2019, Vol. 38 
