中南大学学报（自然科学版）2017，Vol.48Issue(5)：1252-1260,9.DOI:10.11817/j.issn.1672-7207.2017.05.018
深部岩体在掏槽爆破过程中的损伤演化机制
Damage evolution mechanism of deep rock mass in process of cut blasting
摘要
Abstract
For the purpose of research on the damage evolution mechanism of deep rock mass in the process of cut blasting, a coupled model between the Cowper-Symonds hardening model and tension-compression damage model was implemented into commercial software LS-DYNA to simulate the damage evolution mechanism of deep rock mass in the process of cut blasting. The numerical results show that the in-situ stress and existence of free surface have an influence on the damage evolution mechanism of deep rock mass in the process of cut blasting. Since the in-situ stress exerts the resistance on the pressure load induced by blasting load in the rock mass, the damage scope of the rock mass surrounding the cut holes is influenced accordingly, and the damage scope decreases with the increase of the in-situ stress. However, in the process of cut blasting, the center hole as a free surface can enlarge the damage scope surrounding the cut holes. That is because the stress waves change into tensile stress waves upon the reflection at the free surface, here, and the tensile damage caused by tensile stress waves at the free surface propagates toward the inner rock mass, and eventually the damage scope of the rock mass surrounding the cut holes is enlarged.关键词
深部岩体/掏槽爆破/拉压损伤模型/地应力/抵制作用/损伤范围Key words
deep rock mass/cut blasting/tension-compression damage model/in-situ stress/resistance/damage scope分类
建筑与水利引用本文复制引用
谢理想,卢文波,姜清辉,张乾兵,王高辉,陈明,严鹏..深部岩体在掏槽爆破过程中的损伤演化机制[J].中南大学学报（自然科学版）,2017,48(5):1252-1260,9.基金项目
国家自然科学基金资助项目(51125037) （51125037）
国家重点基础研究发展规划(973计划)项目(2011CB013501) （973计划）
中央高校基本科研业务费专项(2014210020202) (Project(51125037) supported by the National Natural Science Foundation of China （2014210020202）
Project(2011CB013501) supported by the National Basic Research Development Program (973 Program) of China （2011CB013501）
Project(2014210020202) supported by the Fundamental Research Funds for the Central Universities) （2014210020202）
