基于离散元法崩塌体动力破碎分析  

Dynamic crush analysis of collapse bodies based on the discrete element method

作　　者：孙新坡[1] 何思明[2] 于忆骅[1] 

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621010 [2]中国科学院水利部成都山地灾害与环境研究所,四川成都610041

出　　处：《浙江工业大学学报》2015年第4期464-467,共4页Journal of Zhejiang University of Technology

基　　金：国家自然科学基金资助项目(41472325);西南科技大学博士基金资助项目(12zx7124);绵阳市科技局项目(14Q0013)

摘　　要：在汶川大地震的影响下,西南地区山体破坏严重.岩质边坡几乎全部出现破坏,崩塌十分严重,产生了大量的崩塌体,堆积于洞口或缓坡地带;且上方陡坡残留大量震裂岩体,在余震和多雨、多风的天气下易产生崩塌,对公路产生威胁.采用离散元法对崩塌体模拟,通过对不同粘结强度的崩塌体动力破碎的影响进行的数值模拟研究.结果显示:崩塌体的粘结强度可以由离散元的平行键强度来模拟,不同粘结强度对崩塌体的运动和堆积形态有重要影响,再现了崩塌体破碎动力演化过程.为崩塌体破碎和防御提供理论依据.Owing to the influence of the Wenchuan earthquake, mountains in the southwest of China were seriously destroyed. Almost all rock slopes were damaged and the collapse was very serious, producing a large amount of collapse bodies at the mouth of caves or in gentle slope zones. There were a large mount of cracked rocks in the upper steep slopes. Under the conditions of aftershock, and rainy and windy weather, these rocks are easily collapsed, threatening the safety of highways. A numerical simulation is conducted on the dynamic crush of collapse bodies with different bond strengths by the discrete element method. The results show that the bond strength of collapse bodies can be modeled by the parallel bond strength designed in the discrete element method. The bond strength has important influence on the movement and accumulation of collapse bodies, and the evolution process of the dynamic crush of collapse bodies is reproduced, which provides a theoretical guidance for the defense of collapse hodies.

关 键 词：崩塌 离散元方法 PFC 破碎 

分 类 号：X4[环境科学与工程—灾害防治]