辽宁工程技术大学学报（自然科学版）2017，Vol.36Issue(11)：1137-1142,6.DOI:10.11956/j.issn.1008-0562.2017.11.004
采场老顶岩梁破断过程
Breaking process of the main roof
摘要
Abstract
In order to research the fracture process of the main roof,the main roof at the workface before and after initial pressure are respectively simplified as lamped-clamped rock beam and cantilever rock beam.Theoretical analysis combined with experience in which the granite was taken to simulate the old roof rock beam under the initial and periodic compression has been adopted to study this problem.Meanwhile,numerical simulation based on tensile failure criterion,which is independently researched and developed,has been emerged to imitate the failure of the rock beam.Results show that:There are two stages of fracture process of the lamped-clamped rock beam under uniform load:the crack conceives firstly at the end of rock beam and the crack happened in the middle of rock beam;the expansion direction of the crack at the end of lamped-clamped rock beam is related with the ratio of the height and the length of rock beam,however,the expansion direction of crack in the middle of rock beam is always perpendicular to the axial direction;the crack of cantilever rock beam only happened at the end of the beam,and the expansion direction of the crack is related with the ratio of the height and the length of rock beam;with the expansion of the crack of the lamped-clamped rock beam,the fixed part of the rock beam is reducing,and the unbalanced force is increasing,which will lead the speed of crack propagation increasing.关键词
采场老顶岩梁/固支岩梁/悬臂岩梁/裂纹/不平衡力/有限元开裂包/破断过程Key words
old roof beam/lamped-clamped rock beam/cantilever rock beam/crack/unbalanced force/the cracking package of finite element/the fracture procession分类
矿业与冶金引用本文复制引用
王来贵,潘纪伟,赵娜,杨建林,习彦会..采场老顶岩梁破断过程[J].辽宁工程技术大学学报（自然科学版）,2017,36(11):1137-1142,6.基金项目
国家自然科学基金(51274110) （51274110）
国家自然科学基金面上项目(51474121) （51474121）
国家自然基金煤炭联合基金重点项目(U1361211) （U1361211）
