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| Experimental study on effect of roughness on strength and deformation characteristics of interface between siliceous slate and mudstone |
| ZHU Yanbo1，ZHANG Yuxuan1，LI Wenjie1，YANG Fanfan1，HAN Yutao1，LI Futong1，LAN Hengxing1，2 |
| (1. College of Geological Engineering and Geomatics，Chang′an University，Xi′an，Shaanxi 710054，China；
2. Institute of Geographic Sciences and Natural Resources Research，Chinese Academy of Sciences，Beijing 100101，China)
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Abstract To investigate the effect of the roughness on the strength and deformation characteristics of the interface between siliceous slate and mudstone，the direct shear test of interface specimens was conducted using an interface shear apparatus. The shear failure mode，the shear deformation and the strength characteristics of interfaces were analyzed，and then the influence mechanism of roughness on the shear strength increase of the interfaces was discussed. The results indicate that：(1) The shear failure modes of the interfaces of siliceous slate and mudstone are divided into cutting off along the interfaces，cutting off in mudstone and mixed shear-off between the interface and the mudstone. (2) Roughness has a significant effect on the shear deformation characteristic of the siliceous slate-mudstone interface. With increasing the roughness，the deformation modulus of the samples decreases and the shear displacement corresponding to peak strength increases，indicating that the deformation of interface samples during shearing are larger. (3) The roughness significantly improves the shear strength of siliceous slate-mudstone interface. The greater the interface roughness，the greater the increment of the peak strength and the residual strength of the interface are. The cohesion of the interface samples increases greatly with the roughness，whereas the friction angle hardly increases. (4) The mudstone is continuously scraped and compacted by the rough interface of siliceous slate during shearing，forming a “hardening shear band”. The greater the roughness of siliceous slate，the thicker the hardening shear band，and the shear plane of samples tends to occur in mudstone. As the shear strength of mudstone is greater than that of interfaces，the shear strength of interface samples increases continuously with increasing roughness，and its increment is mainly controlled by the cohesive strength of mudstone.
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2022, Vol. 41 
