PFC NUMERICAL SIMULATION OF TRUE TRIAXIAL LOADING AND UNLOADING MECHANICAL PROPERTIES OF LAYERED ROCK MASS
In this study,we study the mechanical properties of layered rock mass by numerical simulating true triaxial loading and unloading through PFC3D.The influences of geometric relationship between the direction of principal stress and bedding plane and stress level on the strength and deformation characteristics of layered rock mass are analyzed.The results show that under the condition of true triaxial loading,when the middle principal stress and the minimum principal stress are kept constant,the inclined angle β of joint plane increasing from 0 ° to 90 °,the compressive strength,elastic modulus and peak strain of the specimen decrease first and then increase,and the Poisson s ratio of the specimen increases first and then decreases.When the intermediate principal stress remains unchanged,the compressive strength,elastic modulus and peak strain of the specimen increase with the increase of the minimum principal stress,and the Poisson's ratio of the specimen decreases with the minimum principal stress.Failure occurs when the intermediate principal stress is the same and the minimum principal stress is the same,and the inclined angle β of joint plane is 0 °,15 °,30 °,45°and 90° the compressive strength under true triaxial loading is basically the same as that under true triaxial unloading,but the effect of true triaxial loading and unloading on the peak strain of the specimen is obvious.
Layered rock masstrue triaxial loading and unloadingmechanical propertiesPFC
NETL
NSTL
万方数据
