Modifying Algorithm for the Failure Stress According to the Joint Strength Formula

The Tension-Shear and Compression-Shear Joint Strength Model for Unsaturated Clay and Its Application to Slopes

“…The theoretical research on the joint strength of soil mainly focuses on plane stress conditions and clay and can be roughly divided into two categories. One category is that the joint strength formula is established by using an empirical curve from strength test data (Abbo and Sloan, 1995;Li et al, 2016); the other category is that the joint strength formula is derived by using soil strength index (c, φ, and σ t ) based on some assumptions (Vesga, 2009;Zhang et al, 2010). c is the cohesion of unsaturated soil, φ is the compression-shear internal friction angle of unsaturated soil, and σ t is the uniaxial tensile strength.…”

“…This is mainly because the issue is seemingly simple but actually complex in the intrinsic mechanism. After years of research, some beneficial results of the joint strength theory have been obtained, such as the Griffith strength criterion (Margolin, 1984;Singh and Zimmerman, 2014), the hyperbolic joint strength criterion (Abbo and Sloan, 1995;Li R. J. et al, 2014;Li et al, 2016) and the Griffith-Mohr strength criterion (Vesga, 2009;Zhang et al, 2010). However, most existing research adopts some simplified methods to describe the tension-shear coupling strength owing to the unclear strength mechanism of soil under tension-shear coupling stress.…”