Elastic-plastic stress and strain analysis of the dam and foundation is done and the mechanism of sliding is revealed by the strength reserve coefficient method.

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.

Using the RFPA numerical code,the failure process of vertically stratified rock mass around underground excavations is simulated and the failure characteristics between vertically stratified and intact rock mass are comparatively discussed under different lateral pressure coefficients.

The critical phenomenon in rock failure is analyzed with renormalization model on the assumption that strength of rock fallows probability distribution and self-similar characteristic.

Analysis of instability failure of certain inclined bracing steel frame;