基于连续退化计算的各向异性岩体爆破损伤研究

项目名称： 基于连续退化计算的各向异性岩体爆破损伤研究

项目编号： No.51304239

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 矿业工程

项目作者： 刘科伟

作者单位： 中南大学

项目金额： 25万元

中文摘要： 在对爆破荷载作用下地下岩体结构进行稳定性分析时，构建基于连续退化计算的各向异性岩体模型能够更加准确地评估爆破荷载作用下的岩体损伤，目前这方面的研究鲜有报道。本项目以等效岩体材料属性方法考虑节理和裂隙的影响，获得岩体三个方向的等效初始破坏值，以等效岩石材料硬度和强度的连续退化研究各向异性破坏累计并利用主拉应变的指数函数对其进行计算，同时，结合一系列小规模的爆破试验，验证所建立的岩体各向异性等效材料模型，实现对各向异性岩体的连续损伤计算。在此基础上，将该模型应用到地下岩体结构的爆破损伤分析中，进一步研究地下岩体结构对应力波主频、频带内容和能量分流的影响机理。项目研究不仅可以用来评估地下岩体结构在爆破荷载作用下的稳定性，还可以在工程实践中正确指导爆破作业，更重要的是，采用各向异性破坏理论分析爆破荷载作用下的岩体损伤，为深入认识岩体在高应变率动态荷载下的岩体行为提供了更为丰富的研究手段。

中文关键词： 各向异性岩体；台阶爆破；应力波；爆破损伤；有限元

英文摘要： It is meaningful to use a three-dimensional anisotropic model based on calculation of continuous degradation for rock mass in order to have more accurate damage estimations under blasting loads. However, few papers can be found to use the anisotropic damage theory to analyze the behavior of a rock mass under blasting loads. In this project, the effects of existing cracks and joints will be considered by using equivalent material properties to get the statistical initial damage in three directions, and the anisotropic damage accumulation will be studied by the continuous degradation of equivalent material stiffness and strength during the loading process and calculated using an exponential function with respect to the principal tensile strain. Besides that, Some blasting tests of smaller scale will be carried out in an open-pit mining site and the field blasting test data will be used to verify the accuracy of the numerical simulations in order to achieve accurate calculation of anisotropic continuum damage under blasting loads. The verified numerical model is then used to perform a series of simulation to further study the mechanism of effect of existing underground rock structure on principal frequency, content of frequency band of stress wave induced by blast and energy distribution. These researches of this p

英文关键词： Anisotropic Rock Mass；Bench Blasting；Stress Wave；Blast-Induced Damage；Finite Element