不同位置爆源作用下硐室围岩损伤规律的数值模拟研究  

Numerical Simulation of Damage Law of Chamber Surrounding Rock Mass under Different Blasting Sources

作　　者：唐海 马谕杰 夏祥[2] 袁超 张肖雨 范磊 姜威振 TANG Hai;MA Yu-jie;XIA Xiang;YUAN Chao;ZHANG Xiao-yu;FAN Lei;JIANG Wei-zhen(School of Resources Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;State Key Laboratory of Geomechanics and Geotechnical Engineering,Institute of Rock and Soil Mechanics,Chinese Academy of Sciences,Wuhan 430071,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湘潭411201 [2]中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室,武汉430071

出　　处：《爆破》2023年第2期181-190,共10页Blasting

基　　金：湖南省教育厅资助科研项目(20A196);湖南省自然科学基金项目(2021JJ40211)。

摘　　要：爆破作用下硐室围岩的损伤扩展过程对硐室抗爆设计具有重要意义。为探究不同位置爆源作用下硐室围岩的损伤扩展规律,利用有限元模拟软件ANSYS/LS-DYNA建立了顶爆、拱顶侧爆、侧爆、底部侧爆及底爆5个等爆源距数值计算模型,对模型中的岩体采用RHT模型分析了不同位置爆源作用下硐室围岩的损伤扩展过程。在此基础上,在模型中沿爆源至硐室边界处等距离地设置了10个振速监测点,研究了爆源中心至硐室边界处的振动速度衰减规律。结果表明:相同爆源距不同爆源位置下硐室围岩的损伤扩展规律为首先在距爆源最近距离处出现“损伤点”,在“损伤点”形成后,损伤区沿着硐室边界逐步扩展,最终形成沿硐室边界处的损伤区。相较于爆破振动速度衰减规律,爆破振动波在硐室围岩处发生全反射,使硐室围岩处爆破振动速度出现放大效应。同时,爆源至硐室围岩处的损伤演化与峰值振速变化规律相互对应,将硐室围岩处峰值振速放大效应与硐室围岩的损伤结合,认为硐室围岩是否产生损伤可通过监测其振动速度进行确定。The study of damage expansion process of the surrounding rock mass under blasting is of great significance to the blast resistance design of a chamber.In order to explore the damage propagation law of the surrounding rock mass around a chamber under the action of different blasting sources,a numerical calculation model including top explosion,vault side explosion,side wall explosion,bottom side explosion and bottom explosion was established by using the finite element simulation software ANSYS/LS-DYNA.The RHT model was used to analyze the damage propagation process of the chamber surrounding rock mass at different positions.On this basis,10 vibration velocity monitoring points were set equidistantly from the blast source to the chamber boundary in the model,and the vibration velocity attenuation law from the blast source center to the chamber boundary was studied.The results show the damage point first appears at the shortest distance from the blast source,and is then formed subsequently.The damage zone expands gradually along the boundary of the chamber and finally forms the damage zone.Compared with the decay law of the blasting vibration velocity,the blasting vibration wave is fully reflected in the surrounding rock mass,which makes the blasting vibration velocity appear an amplification effect.At the same time,the damage evolution from the blast source to the surrounding rock mass corresponds to the change law of the peak vibration velocity,which can be used to determine if damage happens.

关 键 词：不同爆源位置 RHT模型 围岩损伤 振动速度 数值模拟 

分 类 号：TD235.3[矿业工程—矿井建设]