基于FLAC3D不同倾角结构面剪切特性研究

为了分析不同倾角结构面对裂隙岩体强度及变形性质的影响,本文通过数值模拟的方法,分析了0°、15°、30°、45°、60°、75°、90°7种典型倾角结构面岩体在三轴压缩条件下的应力应变响应,并从微观角度分析了结构面的变形性质.研究结果表明：在相同围压条件下,随着结构面倾角的增大,不同倾角结构面岩石试件抗压强度呈先减小后增大趋势;含有90°倾角结构面的岩石试件的抗压强度与含有0°倾角结构面岩石试件的相等;随着结构面倾角的增大,结构面上的剪应力的变化趋势是由中部向结构面倾向方向的两侧扩展,并且逐渐趋于集中.

A Numerical Simulation of the Fractured Rock Mass with Different Obliquities Structural Planes under Pressure

In order to analyze the structural planes with different obliquities on strength and deformation properties of the fractured rock mass, the stress-strain response of the fractured rock mass under triaxial compression which is crossed by seven typical inclination structural planes including 0°, 15°, 30°, 45°, 60°, 75°, 90° was analyzed by numerical simulation method in this paper. Analyze the deformation properties of the structural planes from the microscopic point of view. The results show that, in the same confining pressure conditions, the compressive strength first decreases and then increase with the increase of structure plane inclination angle. Compressive strength of sample with 90° structural plane inclination angle equal that of sample with 0° structural plane inclination. Along with the increase of structure plane inclination angle, the shear stress of the structure planes has an expand tendency from the centre to the both sides of the direction, and becoming more and more concentrated.