Anisotropic shearing mechanism of Kangding slate:Experimental investigation and numerical analysis  

作　　者：Ping Liu Quansheng Liu Penghai Deng Yucong Pan Yiming Lei Chenglei Du Xianqi Xie 

机构地区：[1]The Key Laboratory of Geotechnical and Structural Engineering Safety of Hubei Province,School of Civil Engineering,Wuhan University,Wuhan,430072,China [2]State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan,430072,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第5期1487-1504,共18页岩石力学与岩土工程学报（英文版）

基　　金：support from the Natural Science Foundation of China(Grant Nos.41941018,U21A20153,42177140).

摘　　要：The shear mechanical behavior is regarded as an essential factor affecting the stability of the surrounding rocks in underground engineering.The shear strength and failure mechanisms of layered rock are significantly affected by the foliation angles.Direct shear tests were conducted on cubic slate samples with foliation angles of 0°,30°,45°,60°,and 90°.The effect of foliation angles on failure patterns,acoustic emission(AE)characteristics,and shear strength parameters was analyzed.Based on AE characteristics,the slate failure process could be divided into four stages:quiet period,step-like increasing period,dramatic increasing period,and remission period.A new empirical expression of cohesion for layered rock was proposed,which was compared with linear and sinusoidal cohesion expressions based on the results made by this paper and previous experiments.The comparative analysis demonstrated that the new expression has better prediction ability than other expressions.The proposed empirical equation was used for direct shear simulations with the combined finite-discrete element method(FDEM),and it was found to align well with the experimental results.Considering both computational efficiency and accuracy,it was recommended to use a shear rate of 0.01 m/s for FDEM to carry out direct shear simulations.To balance the relationship between the number of elements and the simulation results in the direct shear simulations,the recommended element size is 1 mm.

关 键 词：ANISOTROPY Empirical expression of cohesion foliation angles Combined finite-discrete element method(FDEM) Shear rate Element size 

分 类 号：TU45[建筑科学—岩土工程]