长沙理工大学学报（自然科学版）2025，Vol.22Issue(1)：82-90,9.DOI:10.19951/j.cnki.1672-9331.20231008001
考虑方向性与应力状态的粉砂质泥岩节理面粗糙度系数研究
Investigation on roughness coefficient of silty mudstone joint surfaces considering direction and stress state
摘要
Abstract
[Purposes]This paper aims to deeply investigate the method for determining the roughness coefficient of silty mudstone joint surfaces(JRC)under different shear directions and stress states.[Methods]Materials similar to silty mudstone and 3D printing technology were used to fabricate joint surfaces.Direct shear tests were conducted on the joint surfaces under different stress states.Furthermore,based on the morphological parameters of joint surfaces proposed by Grasselli,the shear direction was considered to investigate the shear strength of silty mudstone joint surfaces.[Findings]The failure types of silty mudstone joint surfaces are different due to the fluctuation degree of joint surfaces,shear direction,and normal stress,and the JRC value obtained by inversion of test results is larger than the empirical JRC value proposed by Barton et al.In addition,a method of calculating JRC value of silty mudstone joint surfaces considering direction and stress state was proposed.The error between the predicted value and the calculated value is less than 10%.[Conclusions]The roughness coefficient of joint surfaces has a significant relationship with the undulation pattern of shear direction.With the increase in normal stress,the JRC value increases,but the rate of increase decreases.The JRC value calculation method considering the shear direction and normal stress of the joint surfaces can effectively predict the shear strength of silty mudstone joint surfaces under different shear direction and normal stress conditions.关键词
粉砂质泥岩节理面/粗糙度系数/抗剪强度/直剪试验/强度特性Key words
silty mudstone rock joints/roughness coefficient/shear strength/direct shear test/strength characteristics分类
交通运输引用本文复制引用
吴俊哲,史振宁,魏笑..考虑方向性与应力状态的粉砂质泥岩节理面粗糙度系数研究[J].长沙理工大学学报（自然科学版）,2025,22(1):82-90,9.基金项目
国家自然科学基金资助项目(51838001) （51838001）
湖南省自然科学基金资助项目(2022JJ40491) （2022JJ40491）
湖南省教育厅青年基金资助项目(22B0295) Project(51838001)supported by the National Natural Science Foundation of China （22B0295）
Project(2022JJ40491)supported by Natural Science Foundation of Hunan Province （2022JJ40491）
Project(22B0295)supported by Youth Foundation of Hunan Provincial Department of Education （22B0295）
