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深部岩土工程领域面临的井筒、巷道以及硐室等埋深较深结构物,其上方的土体大多处于非极限状态。现有理论很少关注非极限状态的土压力计算,基于此建立了考虑土拱效应的滑移面间非极限状态土压力计算模型。基于主应力旋转理论和简化的抛物线型滑移面,推导了滑移面上的侧向土压力系数;基于大主应力拱假设,采用极限平衡法建立了滑移面间土体中平均竖向应力的微分方程,并给出了解析解答;进一步,采用文中方法和经典理论解答分析了极限状态时滑移面间的土压力并与物理模型试验结果进行了对比,验证了方法的正确性;最后,进行了滑移面间非极限状态土压力算例分析,结果表明,建立的土压力解答能够较好地反映土体内部土拱演化过程中结构物上方及土体内部滑移面间的土压力状态及其与滑移面之间的演化关系。
In the deep geotechnical field, deep well structures, such as wellbores, tunnels and chambers, are exposed, and the soil above it is mostly in a non-limit state. Existing theories pay little attention to the calculation of soil pressure in the non-limit state. Based on this, the earth pressure calculation model for the non-limit state of slip surface considering the soil arching effect is established. Based on the principle of principal stress rotation and the simplified parabolic slip surface, the lateral earth pressure coefficient is deduced. Based on the principal stress arch hypothesis, the average vertical The differential equation of stress is given and the analytical solution is given. Furthermore, the earth pressure of the slip surface at the limit state is analyzed by the method of the paper and the classical theory and compared with the results of the physical model test to verify the correctness of the method. Finally, a case study of the earth pressure at the non-limit state between the sliding surfaces is carried out. The results show that the established earth pressure solution can well reflect the relationship between the soil structure above the structure and the internal slip surface Earth pressure state and its evolution relationship with slip surface.