考虑土拱效应的滑移面间非极限状态土压力解答

发布时间：2018-06-04 08:02

本文选题：土拱效应 + 非极限状态　；参考：《岩土力学》2017年11期

【摘要】：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。
[Abstract]:In the field of deep geotechnical engineering, most of the deep buried structures such as shaft, roadway and chamber are in non-limit state. The existing theories pay little attention to the calculation of the earth pressure in the non-limit state. Based on this, a calculation model of the non-limit state earth pressure between slip planes considering the soil arch effect is established. Based on the principal stress rotation theory and the simplified parabolic slip plane, the lateral earth pressure coefficient on the slip plane is derived, and the differential equation of the average vertical stress in the soil between the slip planes is established by using the limit equilibrium method based on the assumption of large principal stress arch. The analytical solution is given. Furthermore, the earth pressure between the slip planes in the limit state is analyzed by using the method and the classical theory, and the results of the physical model test are compared to verify the correctness of the method. A numerical example of non-limit state earth pressure between slip planes is presented, and the results show that, The soil pressure solution can well reflect the soil pressure state above the structure and the slip surface and the relationship between the soil pressure and the slip surface in the evolution process of soil arch.
【作者单位】：中国矿业大学深部岩土力学与地下工程国家重点实验室;中国矿业大学力学与建筑工程学院;河南省城乡规划设计研究总院有限公司;
【基金】：国家重点基础研究发展计划(No.2012CB026103) 国家自然科学基金(No.41271096) 国家高等学校学科创新引智计划(No.B14021) 江苏省研究生培养创新工程(No.KYLX15_1406)~~
【分类号】：TU432

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