高应变率下难动用铁矿爆破回采损伤规律研究  

Research on Damage Rule of Blasting and Stoping Difficult-to-use Iron Ore under High Strain Ratio

作　　者：李新平 洪吉松 罗忆 董千 徐家云[1] 任贤峰 

机构地区：[1]道路桥梁与结构工程湖北省重点实验室,湖北武汉430070 [2]武汉理工大学土木工程与建筑学院,湖北武汉430070 [3]武汉地产开发投资集团有限公司,湖北武汉430022 [4]武汉钢铁集团开圣科技有限责任公司,湖北武汉430000

出　　处：《金属矿山》2017年第10期141-148,共8页Metal Mine

基　　金：湖北省自然科学基金重点项目(编号:2015CFA136);国家自然科学基金项目(编号:51378500);国家自然科学基金面上项目(编号:51274157)

摘　　要：随着资源的不断减少,难动用资源的开发利用愈显重要。以程潮铁矿西区保安矿柱爆破回采工程为背景,考虑到爆破过程中高应变率会导致材料的动力硬化行为以及爆破作用引起的岩体损伤,建立了自定义动态损伤本构模型。并通过二次开发将其嵌入LS-DYNA中,通过与程潮铁矿西区爆破回采实例验证自定义本构模型的正确性。最后基于改进损伤本构模型进一步深入分析,得到较为合适的回采方式和回采顺序,并研究了采场岩体的损伤特性,研究成果可为实际施工提供指导。With the continuous reduction of resources, the development and utilization of difficult-to-use resources is more and more important. In the background of safety pillar blasting stope at Western District in Chengchao Iron Mine, consid- ering the high strain rate which will cause the dynamic hardening of the material during the blast and the impact of the rock mass from the blast, the user-defined dynamic damage constitutive model was built and inserted in LS-DYNA by secondary de- velopment. Its correctness had been verified through comparison with the blast stoping example of Western District in Chengchao ; Finally, the further research was carried out on the basis of the improved damage constitutive model, the applicable stoping method and stoping sequence was obtained. The damage characteristic of the rock mass in the stope was investigated, which offered guidance for the actual construction.

关 键 词：高应变率 改进损伤本构模型 爆破回采 损伤特性 

分 类 号：TD853.391[矿业工程—金属矿开采]