Abstract
Abstract To better study the shear characteristics of infilled joints with soil having different moisture contents, the influence of the moisture content on the shear characteristics of the infilled joint was explored in this paper, and a revised shear strength model of infilled joint surface is proposed. The results show that the shear dilatation modes of joints can be divided into four types: pure shear dilatation, pure shear compression, shear dilation-shear compression and shear compression-shear dilation. As the joint roughness coefficient (JRC) value increases, the normal displacement of the joint surface gradually increases during the shearing process and the normal stress has an inhibitory effect on dilatation. The infill material will weaken the peak shear stress of the joint surface. When the JRC value of joint surface is small, the weakening effect of soil with moisture content of 30% on peak shear stress is obvious. The revised joint roughness coefficient-joint wall compressive strength (JRC-JCS) model of infilled joint is proposed and the maximum shear stress value calculated by the model has a good linear relationship with the test value.
Highlights
Rock mass is a geological body composed of structural body and joint surface
The results show that the shear dilatation modes of joints can be divided into four types: pure shear dilatation, pure shear compression, shear dilation-shear compression and shear compression-shear dilation
As the joint roughness coefficient (JRC) value increases, the normal displacement of the joint surface gradually increases during the shearing process and the normal stress has an inhibitory effect on dilatation
Summary
Rock mass is a geological body composed of structural body and joint surface. The existence of joint surface seriously. Pereira [10] designed a rotating shear test to study the shear characteristics of the discontinuous surfaces of the filled thin sand, and compared it with the results of the unfilled and planar discontinuous shear test. Jahanian [13] conducted a series of constant normal load direct shear tests to study the shear strength of joints with different roughness and filling characteristics. Zhao [15] studied the shear behavior of the joint surface filled with sand and clay. In this paper, direct shear test of rock-like material infilled joint is designed to obtain peak strength, normal displacement and shear displacement of joint surface filled with soil with different moisture contents, and the influence of water content on the shear characteristics of joint surface is obtained. The JRC-JCS formula proposed by Barton is further improved, and the application scope is expanded, which is closer to the real situation in practical application
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
