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| STRENGTH PARAMETERS OF QUARTZ-MICA SCHIST UNDER COMPLEX STRESS STATE |
| ZHOU Huoming1，SHAN Zhigang2，ZHANG Yihu1，LI Weishu1，CHAI Nengbin1，WANG Shuai1 |
| (1. Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources，Yangtze River Scientific Research Institute，Wuhan，Hubei 430010，China；2. PetroChina Huadong Engineering Corporation，Hangzhou，Zhejiang 310014，China) |
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Abstract Strength and rheological properties of quartz-mica schist is obtained by new technology of the situ true triaxial test which can simulate complex stress state of tunnel sidewall. D-P criterion which could reflect three shear stress state is utilized to study strength parameters of quartz-mica schist under complex stress state. Under the specific condition when stress is unloaded in the direction perpendicular to the foliation plane，shear strength parameters obtained from D-P criterion are lower than shear strength parameters obtained from M-C criterion. Due to more practical stress state，true triaxial rheological parameters of D-P criterion under the condition with unloaded side pressure path can reflects the strength characteristics of rock masses of tunnel better than those under the condition with axial loaded path.
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2015, Vol. 34 
