考虑峰后软化的圆形巷道稳定性分析及工程应用

发布时间：2018-04-06 23:03

本文选题：圆形巷道　切入点：统一强度理论　出处：《中国安全生产科学技术》2017年10期

【摘要】：为获得更准确的巷道围岩应力分布和变形特征,基于统一强度理论,考虑围岩塑性软化和中间主应力的影响,引入塑性软化参数,推导出巷道围岩弹塑性区应力、塑性区范围和位移的表达式。通过算例分析,得到塑性软化系数和中间主应力等相关参数对巷道围岩应力分布、塑性区半径和位移的影响规律。研究结果表明:随内摩擦角软化系数和黏聚力软化系数的增大,围岩塑性区半径和位移呈现先急剧后缓慢的减小趋势;中间主应力系数对巷道围岩弹塑性应力有着显著影响,中间主应力系数越大,围岩塑性区半径和位移越小。
[Abstract]:In order to obtain more accurate stress distribution and deformation characteristics of surrounding rock in roadway, considering the influence of plastic softening and intermediate principal stress of surrounding rock on unified strength theory, the stress in elastic-plastic zone of roadway surrounding rock is deduced by introducing plastic softening parameter.The range of plastic zone and the expression of displacement.The influence of plastic softening coefficient and intermediate principal stress on stress distribution, radius of plastic zone and displacement of roadway surrounding rock is obtained by example analysis.The results show that with the increase of internal friction angle softening coefficient and cohesion softening coefficient, the radius and displacement of surrounding rock plastic zone decrease sharply first and then slowly, and the intermediate principal stress coefficient has a significant effect on the elastoplastic stress of roadway surrounding rock.The larger the intermediate principal stress coefficient, the smaller the radius and displacement of surrounding rock plastic zone.
【作者单位】：安徽理工大学深部煤矿采动响应与灾害防控重点实验室;安徽理工大学能源与安全学院;中国矿业大学(北京)资源与安全工程学院;
【基金】：安徽省高校自然科学研究项目重点项目(KJ2017A093)
【分类号】：TD322.4

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