TRIAXIAL TESTING STUDY ON CREEP CHARACTERISTICS OF MICA-QUARTZOSE SCHIST

A quite number of triaxial creep tests were conducted on mica-quartzose schist,and the characteristics of creep deformation and long-term strength for this schist was analyzed by comparing with radial creep and axial creep in the tests.It was shown that,for this schist,taking the long-term strength of radial creep as the long-term strength was more reasonable since the radial creep is more sensitive than the axial creep.Besides,the higher confining compression is,the stronger the restraint of compression was to radial deformation,which resulted in decrease of both the long-term strength of radial creep and the long-term strength of axial creep.However,the ratio of the long-term strength of radial creep to the long-term strength of axial creep reduces with increasing of confining compression.This case study also indicated that the study of radial creep is significant.