2026-10-11T10:25:22Z https://www.scidb.cn/oai

10.57760/sciencedb.46402 2026-08-21T17:12:52Z

2026-08-21 Roughness-filling interaction controlling shear behavior and failure mechanisms of gypsum-filled rock joints doi:10.57760/sciencedb.46402 en The interaction between joint roughness and infilling material makes the shear behavior of filled rock discontinuities difficult to predict. Direct shear tests were conducted on gypsum-filled joints to investigate the effects of filling thickness, JRC, and gypsum-to-water ratio on shear responses and failure mechanisms. The results show that increasing filling thickness decreases peak shear strength, residual strength, and normal dilation, with a more pronounced weakening effect for rougher joints. Conversely, increasing JRC enhances shear performance, but this strengthening effect is progressively reduced by thicker filling layers. The gypsum-to-water ratio does not alter the overall influence trends of filling thickness and roughness, but it regulates the compactness and fragmentation characteristics of the infill medium, with higher ratios improving roughness-induced strengthening and reducing infill crushing. The coupled effect of filling thickness and JRC controls the transition of dominant shear mechanisms, shifting from infill-dominated abrasion to asperity-controlled brittle fracture with decreasing filling thickness or increasing roughness. The agreement between failure morphology and mechanical responses reveals the intrinsic relationship between damage evolution and shear behavior, providing new insights into the failure mechanisms of gypsum-filled rock joints. Roughness; Filling thickness; Gypsum-to-water ratio; Shear performance; Morphology deterioration Shuguang Zhang Xiangpan Zeng Wenbo Liu Gui Cheng Chunxue Yang Junkang Zhao Yingbo Li Jinxin Han Yipin Liu Dipeng Zhu Wenwu Ou RESTRICTED dataset Science Data Bank