摘要
针对冲击地压作用下巷道周边的力学特征,运用应力波传递理论进行推导,并根据现场实测数据,采用数值模拟方法进行研究。根据应力波在巷道周边的传递与反射效应推导巷道围岩的动力响应机理。利用LS-DYNA软件,模拟不同方位冲击源影响下的动力响应。研究发现冲击地压下巷道边界的动力放大效应。在巷道周边的松动圈范围内,动力放大程度与其至边界的距离呈负相关,即动力放大程度从松动圈边界向巷道边界方向逐步增大,并在巷道表面处达到最大。在巷道及其周边的支护设计中,应考虑到不同位置动力响应的差异。经过对比研究,增加锚杆长度、减小锚索长度的参数调控策略相较依据静载条件设置的初步方案,在承受动力冲击时对巷道及其周边可以起到更为明显的控制作用。
In view of the mechanical characteristics of the surrounding roadway under the action of rockburst, the stress wave theory is applied and the numerical simulation method is used to analyze the field measured data. According to the reflection effect of stress wave on the surface of the roadway, the dynamic response mechanism of the surrounding rock of the roadway is derived. The dynamic response of the impact source under different azimuth impacts is simulated with LS-DYNA software. The study has found the dynamic amplification effect of the roadway boundary under impact ground pressure. Within the range of loose circles around the roadway, the degree of dynamic response is inversely related to its distance from the boundary. That is, the degree of dynamic response gradually increases from the boundary of the loose ring to the boundary of the roadway, and reaches the maximum at the surface of the roadway. In the design of the roadway and its surrounding support, the difference in dynamic response at different locations should be considered. After comparative study, the parameter regulation strategy of increasing bolt length and reducing anchor length has a more obvious control effect on the roadway and its surrounding area than the preliminary scheme based on the static load condition.
作者
吕可
王金安
李鹏波
LYU Ke;WANG Jin'an;LI Pengbo(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;State Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mines,Beijing 100083,China;School of Civil and Architectural Engineering,Changzhou Institute of Technology,Changzhou,Jiangsu 213022,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2019年第6期1168-1177,共10页
Journal of Mining & Safety Engineering
基金
国家重点研发计划项目(2017YFC1503104)
关键词
冲击地压
数值模拟
应力波
动力放大
rock burst
numerical simulation
stress wave
dynamic amplification
