煤矿安全2025，Vol.56Issue(11)：64-74,11.DOI:10.13347/j.cnki.mkaq.20240972
冲击地压煤矿巷道锚杆动力响应特征与破坏规律研究
Study on dynamic response characteristics and damage law of anchor bolts in coal mine roadway under rock burst
孙怀明 1李文洲 2李中伟 2褚鹏 1孙越 1李想3
作者信息
- 1. 山东能源集团鲁西矿业有限公司,山东 菏泽 274700
- 2. 中煤科工开采研究院有限公司,北京 100013||天地科技股份有限公司 开采设计事业部,北京 100013
- 3. 武汉理工大学 土木工程与建筑学院,湖北 武汉 430070
- 折叠
摘要
Abstract
Aiming at the problem of frequent occurrence of rock burst disaster in deep coal mine roadway and unclear dynamic re-sponse mechanism of anchor bolt support,we adopt numerical simulation and field test to systematically analyze the mechanical re-sponse characteristics and damage law of anchor bolts with different impact toughness under dynamic load;based on LS-DYNA software,the impact model of anchor bolts was established,and the dynamic response of anchor bolts with yield strength of 500 MPa and impact absorbed work of 15-94 J under 20 ms isosceles triangle load was simulated.By analyzing the Mises stress distribution,fracture characteristics,displacement change and energy absorption law of the anchor bolts,the mechanism of impact toughness on the damage mode of the anchor bolts was revealed,and applied to the design of anchor bolt support in Tangkou Coal Mine 7307 track roadway.The results show that with the increase of impact toughness,the Mises stress at anchor bolt fracture increases,and the fracture necking phenomenon is significantly enhanced;the higher the impact absorption work of the anchor bolt under the same im-pact load,the higher the displacement at fracture,to cause an anchor bolt with high impact toughness to break within a fixed impact time,high impact loads need to be applied.The higher the impact load the greater the deformation rate of the anchor bolt in the plastic deformation stage,resulting in the anchor bolt breaking without giving full play to the deformation capacity,there will be a high impact toughness and low elongation of the anchor bolt.The deformation of the anchor bolt increases with the decrease of dis-tance from the impact load application,but it does not change much in the range of 1.5 m from the fixed end,the study further re-veals the local effect of anchor bolt deformation,in the range of 1.5-2.0 m from the impact point,the deformation increases 50%compared with the section of 1.0-1.5 m,and the plastic strain firstly occurs in the fixed end and extends to the impact point,and fi-nally destroys centrally in the threaded section.关键词
锚杆支护/数值模拟/冲击地压/动力响应特征/冲击韧性Key words
anchor bolt support/numerical simulation/rock burst/dynamic response characteristic/impact toughness分类
矿山工程引用本文复制引用
孙怀明,李文洲,李中伟,褚鹏,孙越,李想..冲击地压煤矿巷道锚杆动力响应特征与破坏规律研究[J].煤矿安全,2025,56(11):64-74,11.
