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对于富水地层中深埋圆形巷道,为研究多种因素影响下巷道围岩塑性区范围和洞周位移的变化规律,对巷道围岩进行了弹塑性理论分析。对围岩应力场和渗流场进行耦合分析,基于统一强度理论和非关联流动法则,推导出多种因素影响下深埋圆形巷道围岩应力、位移和塑性区半径的解析计算式。结合工程实例进行计算分析,结果表明:中间主应力参数、围岩侧压系数、初始孔隙水压和剪胀角对围岩塑性区径向位移和塑性区范围均有显著影响,但影响规律各不相同;考虑中间主应力作用时,其他各因素的影响效应减弱。综合考虑以上各因素对围岩稳定性的影响,计算结果更加接近工程实际情况。
For deep-buried circular roadway in water-rich strata, in order to study the variation of plastic zone and perimeter displacement of surrounding rock under the influence of many factors, elasto-plastic theory analysis is carried out for the surrounding rock of roadway. Based on the unified strength theory and the non-associated flow law, the analytical formulas for the stress, displacement and plastic zone radius of surrounding rock under deep buried tunnel are deduced based on the coupling analysis of surrounding rock stress field and seepage field. The calculation results show that the parameters of middle principal stress, the lateral pressure coefficient of surrounding rock, initial pore pressure and dilatancy angle have significant influence on the radial displacement of plastic zone and the range of plastic zone, but the influence laws Not the same; consider the role of intermediate principal stress, the impact of other factors weakened. Considering the above factors on the stability of surrounding rock, the calculation results closer to the actual situation of the project.