Shear strength of jointed rock is much lower than the strength of intact rocks. In the field, it represents the plane of weakness, and it can be associated with rock mass movements. There are several things considered in the estimation of jointed rock shear strength. If you are not familiar with them, you should watch the following videos first:
Simple Formula to Estimate Total Vertical Stress in Rock Mass • Simple Formula to Esti...
How to Measure Friction between Two Rock Surfaces I Tilt Test Procedure • How to Measure Frictio...
Schmidt Hammer Test | Testing Procedure on How to Measure Rock Strength in Field • Schmidt Hammer Test | ...
Schmidt Hammer Test | Part 2: Data analysis • Schmidt Hammer Test | ...
How To Measure Rock Surface Roughness | Joint Roughness Coefficient • Easy Way To Measure Ro...
Other failure criteria:
Hoek-Brown failure criteria • Hoek-Brown Failure Cri...
Using Mohr-Coulomb Failure Criteria for Rocks • Using Mohr-Coulomb Fai...
Shear Strength of Jointed Rock | Barton's Equation • Shear Strength of Join...