Research on entropy catastrophic regularity and failure criterion in the deformation and failure process of rocks;

Study on slope failure criterion based on strength reduction and gravity increase method;

Study on plane instability model and failure criterion of horizontal-strata landslide

Numerical simulation was made on the thick- ness of mid-pillars in small internal tunnel with finite element method;fitting curve of maximum tensile stress,yield func- tion criteria and small interval was obtained through Griffith damage criteria and Drucker-Prager criteria.

The results show that the load bearing capacity of the ELPER depends mainly on the critical load of instable failure instead of the ultimate load capacity of the soil close to the pile point.

A Simple and clear criterion of instable failure of rock specimen in uniaxial compression was obtained.

Theoretic study of rock unstable failure;

In fact,the roadway debris flow is the result of sudden unstable failure of the comprehensive function of fault structure,hydraulic water dashing rock gravitation and unjust construction opera- tion in a large rock body,analysed in detail the forming process and thus put.