中文摘要：

以都江堰-汶川高速公路龙洞子隧道出口的崩塌灾害为对象,研究崩塌体的运动以及优化防护结构。采用基于离散元方法对崩塌灾害进行数值模拟,并开展了崩塌体与拦石墙动力冲击响应研究。结果表明：冲击动力响应结果与拦石墙高度、崩塌体运动距离、崩塌体内部块石摩擦系数及坡脚与拦石墙间的缓冲区距离均有一定的关系;拦石墙在崩塌体动力冲击作用下表现为宏观裂缝张开、微观具有冲击力超过颗粒平行连接强度而断裂的特征;进一步通过数值模拟优化了拦石墙的结构模型和设计参数。

英文摘要：

Numerical simulations of coupling computational methods of Discrete Element Method（DEM）is used to study the motion of collapse and its optimizing prevention structure in the Longdongzi Dujiangyan-Wenchuan Expressway and to explore the dynamic impact response of landslide body to buttress.It shows that the dynamic impact response is related with the height of buttress,motion distance of landslide body,friction coefficient of fragments in the collapse body and the buffer distance between buttress and basal slope.Macroscopically,cracks occurs when collapse body strikes the buttress and microscopically,the impact force excesses the parallel connective strength of particles and produce fractures.The structural model and design parameters of buttress are optimized according to numerical simulation and it proves that the buttress structure model and design parameters are of certain application value.