To more reasonably describe the creep behavior of rock,especially the 2nd and 3rd stages of rock creep,a non-linear creep model of rock was established based on the creep mechanism of rock and introducing a plasticity strengthening function and a viscosity weakening function into the visco-plasticity model.

Some aspects that should be enhanced in research hereafter are pointed out,including the limitation of creep model in application,paying attention to the application of new technical method,and the water action on creep mechanism,etc.

In comparison with the common austenitic stainless steel, it has better performance of anti-oxidation, corrosion resistance and high temperature creep strength.

It emphasized that for the long-term engineering,the creep strength should be chosen in design,while not the quality control strength.

If only considering thepreceding two stages of creep proeess,we can describe it with the unified creep fomula: (2) With development of time,the creep strength submits attenuated trend and finallytend towards the long-term strength limit.

According to the testing results,the creep theory about flabby rocks has been put forward to analyse the stress field,displacement field and rheologic crustal pressure of the underground engineering.

Using ageing theory, hereditary creep theory, hardening theory and flowing theory, the creep of frozen soil under increasing stress was analyzed in processes of attenuation creep, non-attenuation creep and from attenuation to non-attenuation creep.