滚石离散元数值模拟的参数反演

 离散元法(DEM)是数值模拟崩塌落石运动的一个有力方法，但确定离散元输入参数是个难题。提出一个基于已知落石轨迹的离散元参数的反演计算方法。落石轨迹可以通过现场落石试验或者野外实地调查实际落石过程获得。该方法的特征为反演得到的离散元参数可以间接反映边坡与落石冲击时的变形以及植被缓冲效应。建议的几个保证解的有效性得到验证，稳定性措施效果良好。室内落石试验结果和现场落石工程实录验证证明了该算法的有效性和实用性。

IDENTIFICATION OF DEM PARAMETERS FOR ROCKFALL SIMULATION ANALYSIS

Distinct element method(DEM) provides a powerful analytical tool for modeling rockfall behaviors,i.e. trajectories,velocities and energies of falling rocks. Better DEM prediction of the motion of the falling rock requires realistic input parameter values used for the analysis. A methodology is developed in which the DEM parameters are determined from back analysis of a rockfall trajectory observed in field rockfall experiments or traced by site investigation of natural rockfall events. A number of techniques and strategies are proposed to ensure the efficiency and robustness of the solution procedure. The method is also extended into non-homogeneous slope cases,by applying repeatedly the presented procedure to each of the homogeneous segments along a given rockfall trajectory. Laboratory rockfall experiments on small model slopes are carried out to verify the proposed method. Case studies on well-documented rockfall records are also presented to show good performance of the method for both homogeneous and non-homogeneous slopes.