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为了研究高地应力软岩巷道挤压变形及其控制对策,根据实测地应力值和围岩力学参数,分别从基于Hoek-Brown准则的解析计算和有限元数值计算进行了围岩稳定性分析,计算结果显示巷道变形失稳严重,拱顶位移和底臌量大,与现场情况吻合;此外,根据Hoek挤压变形等级曲线判定该巷道围岩变形为非常严重的挤压变形。基于深部巷道围岩稳定性控制理论和“分步联合支护”理论制定了控制围岩挤压变形的支护方案,通过有限元数值软件计算和现场监测验证了该支护方案的效果,结果表明所提出的支护方案能够有效的控制围岩挤压变形。
In order to study the extrusion deformation of soft rock roadway with high geostress and its control measures, according to the measured geostress and mechanical parameters of the surrounding rock, the stability analysis of the surrounding rock is carried out from the analytical calculation and the finite element numerical calculation respectively based on the Hoek-Brown criterion. The results show that the deformation of the roadway is serious and the deformation and stability of the roadway are large. The deformation and deformation of the surrounding rock in the roadway are judged to be very serious according to the Hoek crushing deformation grade curve. Based on the control theory of surrounding rock stability in deep tunnels and the theory of “step-by-step united support”, the supporting scheme for controlling the extrusion deformation of surrounding rock was established. The effect of this supporting scheme was verified by the software of finite element numerical calculation and on-site monitoring The results show that the proposed support scheme can effectively control the extrusion deformation of surrounding rock.