岩体开挖爆破滚石碰撞破碎过程模拟  

Simulation of blasting rockfall impact fragmentation process during rock mass excavation

作　　者：熊峻巍 卢文波[1,2] 唐杰伟[3] 郑祥[3] 陈明[1,2] XIONG Junwei;LU Wenbo;TANG Jiewei;ZHENG Xiang;CHEN Ming(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China;Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education,Wuhan University,Wuhan 430072,China;The First Branch of Sinohydro 7 Co.,Ltd.,Meishan 620860,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072 [2]武汉大学水工岩石力学教育部重点实验室,湖北武汉430072 [3]中国水利水电第七工程局有限公司第一分局,四川眉山620860

出　　处：《武汉大学学报（工学版）》2023年第2期139-147,共9页Engineering Journal of Wuhan University

基　　金：国家自然科学基金项目(编号:51979205,51779193)。

摘　　要：基于叶巴滩水电站高边坡爆破开挖的工程背景,利用动力有限元分析软件ANSYS/LS-DYNA,建立了爆破滚石-地面碰撞破碎模型,研究了滚石碰撞破碎形态及对后续运动的影响,比较了滚石入射速度、滚石形状和碰撞部位、坡面类型对碰撞破碎的影响,分析了滚石初始裂隙宽度和裂隙产状对碰撞破碎难易程度的影响。数值模拟结果表明:滚石的碰撞破碎使得个别块石具有更大的横向飞散距离,其破碎程度和运动影响范围主要与法向撞击速度、撞击部位和坡面类型有关;滚石初始裂隙的存在使滚石与地面碰撞后更易发生破碎,且一般沿初始裂隙发生剪切破坏。Based on the engineering geological data of high slopes rock blasting excavation in Yebatan Hydropower Station, the model of blasting rockfall-ground collision crushing is established to study the broken form and the effect of rockfall impact fragmentation on subsequent movement by using dynamic finite element analysis software ANSYS/LS-DYNA. Influencing factors including incident velocity, shape and contact sites of rockfall and slope type are researched. Especially, this paper mainly studies the influences of the initial crack width and crack occurrence on the impact fragmentation. Numerical simulation results show that the collision and broken of rockfall cause individual pieces to get greater lateral flying distance. Its degree of crushing and range of movement are mainly affected by normal velocity, contact sites and slope type. In addition, rock containing initial cracks is more easily broken after the collision with the ground, and shear failure generally occurs to it along the initial crack.

关 键 词：爆破滚石 碰撞 破碎 裂隙 横向飞散距离 数值模拟 

分 类 号：TD235[矿业工程—矿井建设]