(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)
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.
许东俊，耿乃光. 岩石强度随中间主应力的变化规律[J]. 固体力学学报，1985，6(1)：72-80.(XU Dongjun，GENG Naiguang. The variation law of rock strength with increase of intermediate principal stress[J]. Acta Mechanica Solida Sinica，1985，6(1)：72-80.(in Chinese))
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2015, Vol. 34 
