基于离散元方法的落石冲击力变化规律研究  

Study on Change Law of Rockfall Impact Force Based on Discrete Element Method

作　　者：王林峰[1] 姚昌银 邹政[1] 宋男男[1] 杨培丰 WANG Linfeng YAO Changyin ZOU Zheng SONG Nannan YANG Peifeng(Institute of Geotechnical Engineering, Chongqing Jiaotong University, Chongqing 400074, Chin)

机构地区：[1]重庆交通大学岩土工程研究所,重庆400074

出　　处：《铁道建筑》2017年第6期101-105,共5页Railway Engineering

基　　金：国家自然科学基金(51408084);重庆市教委2014年度科学技术研究项目(KJ1400317);重庆交通大学科学基金(2013kjc043)

摘　　要：采用PFC 2D离散元软件模拟落石冲击铁路棚洞现场试验,从落石冲击力大小、冲击作用时间2方面将数值计算结果与试验结果进行对比分析,验证了数值模拟计算结果与试验结果基本一致。对不同半径、不同密度的落石冲击作用进行了数值模拟,发现在冲击能量相同的情况下,同一密度而半径小或者相同半径而密度小的落石冲击力更大;落石回弹加速度在相同高度的条件下也遵循同一密度而半径小或者相同半径而密度小的落石回弹加速度更大的规律。The PFC 2D discrete element software was used to simulate the field test of rockfall impacting railway shed tunnel. The numerical results were compared with the test results to analyze rockfall impact force and rockfall impact time. It is verified that the numerical simulation results are basically the same as the test results. The numerical simulations of rockfall impact at different radiuses and different densities were carried out. It is found that when the impact energy is the same,the smaller the rockfall radius（ with the same density） or the rockfall density（ with the same radius） is,the larger the impact force is. When the rockfalls have the same drop heights,the rebound accelerations followthe same rules.

关 键 词：线路工程 棚洞 落石冲击力 数值计算 PFC 2D离散元 冲击能量 回弹加速度 

分 类 号：U216.415[交通运输工程—道路与铁道工程]