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对TBM斜井围岩应力场和渗流场进行耦合分析,基于统一强度理论对斜井围岩进行弹塑性力学研究,考虑中间主应力、侧压力系数、斜井倾角和渗流作用的影响,推导出TBM斜井衬砌和围岩中应力、位移解析表达式及塑性区半径计算式。结合工程实例计算分析,结果表明考虑中间主应力作用时,围岩自身稳定性得到增强;在二向非等压状态下,围岩侧压力系数、斜井倾角和渗流作用会对围岩塑性区分布和应力大小产生不同程度的影响。研究结果为渗流条件下TBM斜井施工及安全性评价提供了理论依据,具有工程参考意义。
Based on the unified strength theory, the elastic and plastic mechanics of the surrounding rock of inclined shaft is studied, and the influences of intermediate principal stress, lateral pressure coefficient, inclined shaft inclination and seepage are deduced Analytical Expression of Stress and Displacement in Tunnel Lining and Surrounding Rock of Inclined Shaft and Computation Formula of Plastic Zone Radius. The results show that the stability of the surrounding rock itself is enhanced when considering the action of the intermediate principal stress. Under the condition of two-dimensional non-equal pressure, the lateral pressure coefficient, inclined angle and seepage of the surrounding rock will affect the plastic zone Distribution and stress size have varying degrees of impact. The results provide a theoretical basis for the construction and safety evaluation of TBM inclined shaft under seepage conditions, and have the engineering reference meaning.