thank you so much sir 1- How to calculate the cohesion and friction angle for rocks using Hoek brown failure criteria? 2- Is the method same for calculating cohesion and friction angle from stress strain curves obtained by dynamic loading test by using SHPB test machine?
when you have round or square shear boxes of 50; 60 and 100mm; which box should we choose or which parameter allows us to make a more suitable choice than another?