摘要
为了研究巷道断层处围岩体的力学行为,基于岩石力学的弹塑黏性理论,建立了过断层围岩体的物理模型,分析了不同物理参数对围岩体力学行为的影响;同时通过有限元模拟了围岩体周围应力场的分布。结果表明:断层段围岩体起始应变、起始应变率和稳定应变率均随围岩体应力增大而增加;当断层处围岩体应力小于断层滑移的极限应力时,岩体应变呈线性增长,应变率保持恒定,当其应力大于断层滑移极限应力时,应变率在起始阶段逐渐减小随后保持恒定,且完整岩体弹模的增加使得岩体初始应变减小,断层岩体弹模的增大减少了岩体达到稳定应变率的时间;此外发现围岩体第一和第二主应力的应力集中发生在断层两端,方向集中指向断层,而围岩体第三主应力的应力集中发生在断层和巷道的交叉处,方向集中指向巷道。
In order to study the mechanical behavior of the surrounding rock mass at the fault section, a physical model of surrounding rock mass crossing fault has been established based on the elastic-plastic viscous theory of rock mechanics. And the influences of different physical parameters on the mechanical behavior of surrounding rock mass has been analyzed. At the same time, the distribution of stress field around the surrounding rock mass has been analyzed through the finite element numerical simulation and calculation. The results have shown that the initial strain, initial strain rate and stable strain rate of the surrounding rock mass fault segment increase with stress intensity. When the stress intensity of surrounding rock mass at the fault is less than the limit stress of fault slip, the strain of rock mass will increase linearly and the strain rate remain constant. When the stress intensity of surrounding rock mass at the fault is greater than the limit stress of fault slip, the strain rate will decrease gradually at the initial stage and then remain constant. And the initial strain of rock mass decreases with the elastic modulus of intact rock mass, and the increase of elastic modulus of fault rock mass reduces the time for rock mass to reach a stable strain rate. In addition, it is found that the stress concentration of the first and second principle stresses of surrounding rock mass mainly occurs at both ends of the fault and the direction of the stress concentration points to the fault. While the stress concentration of the third principal stress of surrounding rock mass mainly occurs at the intersection of the fault and roadway, and the direction is concentrated towards the roadway.
作者
宋彦琦
李向上
郝亮钧
马宏发
李小龙
SONG Yanqi;LI Xiangshang;HAO Liangjun;MA Hongfa;LI Xiaolong(State Key Laboratory for GeoMechanics and Deep Underground Engineering,China University of Mining&Technology-Beijing,Beijing 100083,China;School of Mechanics and Civil Engineering,China University of Mining&Technology-Beijing,Beijing 100083,China;The China ENFI Engineering Co Ltd,Beijing 100083,China)
出处
《采矿与安全工程学报》
EI
CSCD
北大核心
2020年第5期1061-1066,共6页
Journal of Mining & Safety Engineering
基金
中国矿业大学(北京)深部岩土力学与地下工程国家重点实验室开放基金项目(SKLGDUEK2017)
国家重点研发计划课题项目(2018YFC0808402)。
关键词
断层构造
围岩体
力学行为
弹塑黏性理论
有限元模拟
fault structure
surrounding rock
mechanical behavior
elastic-plastic-viscous theory
finite element simulation
