Estimation of rock mass parameters based on quantitative GSI system and Hoek-Brown criterion

Compared with Mohr-Coulomb strength criterion,Hoek-Brown strength criterion considers more influential factors such as the rock structure,rock mass strength,rock mass stress state,and so on.It reflects the nonlinear failure characteristics more accurately and consists with practical rock engineering much better.The estimated mechanical parameters of rock masses based on Hoek-Brown strength criterion could provide important reference for ultimate determination mechanical parameters of rock masses.A quantitative geological strength index(GSI)rock mass classification system based on volumetric joint count Jv and joint condition factor JC and Hoek-Brown strength criterion can estimate mechanical parameters of rock masses,and connected with the practical engineering to verify its application effect.The results will provide important guiding significance to engineering design and construction.