EXPERIMENT STUDY OF ROCK STRENGTH DEGRADATION
Rock material strength will degrade with the damage in the rock failure process. This paper reports one self-designed method to test rock strength degradation and introduce the technical routine, sample preparation (including its key technique) and experiment procedure in details. Through self-designed direct shear tests by XJ-1 portable type of shear apparatus, the relationships between shear stress and compressive stress of irregular rock samples which are produced in normal uniaxial and biaxial compressive experiments were obtained. Comparing the Coulomb strength curve gained by the direct shear tests with the ultimate Mohr circle envelope obtained from previous uniaxial and triaxial compressive experiments, it can be seen that the cohesion result measured by uniaxial and triaxial experiments before failure is obviously greater than that obtained by direct shear tests of irregular rock blocks. This difference mainly results from the damage in the rock failure processes of uniaxial and triaxial compressive experiments, not the deviation by the different testing methods.
HOU-QUAN ZHANG YONG-NIAN HE LI-JUN HAN BING-SONG JIANG
Slate Key Laboratory for Geomechanics and Deep Underground Engineering, School of Architecture and Civil Engineering, China University of Mining and Technology Xuzhou, 221008 P.R.China
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
119-124
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）