裂隙岩体精细化数值模型构建与爆破模拟  

Refined Numerical Model Construction and Blasting Simulation of Fractured Rock Mass

作　　者：叶海旺[1] 韦文蓬 周汉红 余梦豪 李兴旺 雷涛[1] 温颖 王其洲[1] 石斌宏 于燕[3] 张生 钟传山 高玉文 HASSAN Abdou Mohamed Abdelkader YE Hai-wang;WEI Wen-peng;ZHOU Han-hong;YU Meng-hao;LI Xing-wang;LEI Tao;WEN Ying;WANG Qi-zhou;SHI Bin-hong;YU Yan;ZHANG Sheng;ZHONG Chuan-shan;GAO Yu-wen;HASSAN Abdou Mohamed Abdelkader(School of Resources and Environment Engineering,Wuhan University of Technology,Wuhan 430070,China;Security Administration of Wuhan Public Security Bureau,Wuhan 430077,China;Huaxin Cement Co.,Ltd.,Wuhan 430200,China;Minmetals Exploration and Development Co.,Ltd.,Beijing 100044,China)

机构地区：[1]武汉理工大学资源与环境工程学院,武汉430070 [2]武汉市公安局治安管理局,武汉430077 [3]华新水泥股份有限公司,武汉430200 [4]五矿勘查开发有限公司,北京100044

出　　处：《爆破》2023年第4期44-51,共8页Blasting

基　　金：国家重点研发计划(2020YFC1909602、2021YFC2902901);湖北省重点研发计划(2021BCA152)。

摘　　要：裂隙岩体爆破数值模拟过程中,裂隙分布模型的真实性,是影响数值模拟结果的关键因素之一,现有节理裂隙构建方法难以实现三维分布上的复杂表征或是实现操作过于繁杂。为探索在LS-DYNA软件中构建三维分布上真实、复杂表征的节理裂隙模型简单可行的操作方法,通过MATLAB软件对爆破数值模型K文件进行解析重组,按照节理裂隙三维分布规律进行勾勒并赋予节理裂隙材料本构,构建出符合节理裂隙分布规律的节理岩体三维精细化数值模型。以某露天石灰石矿山为实例,开展节理裂隙三维分布规律统计分析并在台阶爆破数值模型中进行还原,基于裂隙岩体精细化数值模型,开展露天台阶爆破数值模拟试验和现场爆破试验对比研究。结果表明:采用解析重组方法构建的数值节理模型与实际节理裂隙的误差小于13%;节理裂隙面使岩体内的损伤分布规律发生了变化,与完整岩体相比,损伤范围增加了12.04%,粒径处于0~100 mm的占比降低了8.11%;爆破模拟得到的损伤结果与现场破碎效果接近,统计粒径在0~100 mm之间的碎块的占比,误差为4.16%。解析重组法构建三维节理裂隙,可行、操作简便,数值模拟结果接近实际。The authenticity of fracture distribution model is one of the key factors during numerical simulation of blasting in jointed rock mass,which would obviously affect the numerical simulation results.It is hard to represent the complex three-dimensional joint distribution in the existing joint construction method.To explore a simple and feasible operation method for constructing the complex 3D joint model in LS-DYNA software,a K file of blasting numerical model was analyzed and reorganized by MATLAB software.Furthermore,a 3D refined numerical model for jointed rock mass was constructed by the 3D joint distribution law and the constitutive joint model parameters.Finally,a statistical analysis of the three-dimensional joint distribution law was carried out in an open-pit limestone mine,and the joints were reconstructed in the numerical model of a bench blasting.Consequently,a comparative study of the numerical simulation and the field blasting test for open-pit bench blasting was carried out.The results show that the error between the joints built in the numerical model and the actual joints is less than 13%.The joint surface changes the damage distribution of the rock mass.Compared with the intact rock mass,the damage rock mass range increases by 12.04%,and the proportion of fragments with the size of 0~100 mm decreases by 8.11%.The damage results obtained by blasting simulation are close to the field rock breaking effect,and the percentage error of fragments with the size of 0~100 mm is 4.16%.The analytical reconstruction method is feasible and easy to represent the complex three-dimensional joint distribution,and the numerical results are close to experimental results.

关 键 词：裂隙岩体 裂隙分布规律 地质模型 LS-DYNA 爆破数值模拟 爆破试验 

分 类 号：TD235.3[矿业工程—矿井建设]