【摘要】 利用颗粒离散元软件PFC^3D,通过三轴实验与数值实验结果对比,得到与宏观参数相对应的细观参数,选取两组顺倾结构面,建立边坡模型,分析坡体破坏的细观机理。模拟结果表明,坡体的破坏往往会追踪软弱面,沿最危险滑动面发生移动;边坡颗粒沿最危险面朝坡底移动,坡体内部应力重新分布,两个方向的应力都沿临空面方向有偏移;速度矢量在原坡肩位置附近最大,其愈往坡体内部速度愈小;当多组软弱面坡体内部微裂缝数量足够多时,会形成连续贯通的滑移面,造成边坡的滑移。数值模拟的结果与实际较为吻合,表明采用颗粒离散元法研究发育软弱结构面土坡的破坏机理是可行的。更多还原

【Abstract】 In this paper, by using the particle discrete element software PFC^{3 D}, and based on the comparison of the results of the triaxial experiment and the numerical experiment, the mesoscopic parameters corresponding to the macroscopic parameters are obtained, and two sets of the inclined structure planes were determined to establish the numerical slope model to analyze the meso-mechanical failure of soil slope. The simulation results show that the failure of the slope tends to track the weak surface and move along the most dangerous sliding surface. The slope particles move along the most dangerous surface toward the bottom of the slope, the internal stress of the slope is redistributed and the stresses in both directions are offset along the direction of the free surface, the velocity vector is the largest near the original shoulder position of the slope and the inside more, the smaller. When the number of micro-cracks in slope with weak structural planes is enough, a continuous slip surface will be formed and the slope slip. The results of numerical simulation are in good agreement with the actual ones, which indicates that it is feasible to study the failure mechanism of soil slopes with weak structural planes by particle discrete element method.更多还原