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.
|
|
|
|
|