节理岩巷应力分布规律与失稳机制研究

为研究具有层状特征的节理岩巷应力分布规律与变形机制及控制对策,通过将巷道直墙拱形断面等效为圆形断面,分析层状节理岩巷应力分布和应力集中影响,并以云南某矿埋深为750 m的阶段运输巷道为研究对象,通过现场调查和Phase 2数值模拟等方法,分析了巷道变形机制并给出了相应的支护对策.结果表明:通过粒子群算法得出的巷道应力集...

Study on stress distribution and instability mechanism of jointed rock roadway

For the study of layered characteristics of joints and rock stress distribution and deformation mechanism and control countermeasures, by putting a straight wall arch section of roadway equivalent for circular cross section, analysis of layered joint rock stress distribution and stress concentration effects, and embedded depth of a mine in Yunnan province is 750 m phase transport roadway as the research object, through field investigation and phase 2 numerical simulation method, etc. The deformation mechanism of roadway is analyzed and the corresponding supporting countermeasures are given. The research results show that the influence of tunnel stress concentration obtained by particle swarm optimization algorithm shows that the influence index of tunnel stress concentration is the largest when the tunnel extreme Angle is 135° and the rock strata dip Angle is 45°.The deformation and failure mechanism of the surrounding rock is analyzed. The joints in the surrounding rock develop and the cracks expand to the deep under the action of the ground stress, which eventually leads to the deformation and failure of the surrounding rock. Through the analysis of the designed asymmetric support scheme, the scheme can effectively control the deformation of surrounding rock and ensure the overall stability of surrounding rock. The research results provide a reference for the deformation mechanism analysis and control of this kind of jointed rock roadway.