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土层中地下连续墙开槽容易引起较大的地层变形,且与地层侧向土压力的变化特征有较大关系。基于弹性理论,考虑侧压力与时间及位移相关条件下,建立了地下连续墙开槽引起地层应力和位移变化的理论计算方法。结合地下连续墙开槽的特点,考虑极限情况下,开挖初期作用于地下连续墙槽段周围的有效土压力分布情况,得到与时间和位移有关的土压力计算公式;地下连续墙槽段开挖完成后在远场应力的作用下,槽段周围的应力将重新分布,利用变分原理和保角变换方法,计算得到重分布后的应力计算公式;在此基础上,综合分析地下连续墙矩形槽段施工过程中的水平方向的应力转移问题和竖直方向向下的荷载转移问题,建立了地下连续墙槽段周边沉降量的计算模型,并结合Mindlin解得到三维应力状态下的地表沉降量解析解。通过仿真,将理论成果应用于依托工程,与实际监测结果相对比表明该理论结果正确可行,为规避地下连续墙施工风险提供了理论依据。
Slot formation of underground continuous walls in soil easily leads to large deformation of strata, and has a great relation with the changing characteristics of lateral earth pressure. Based on the elastic theory, considering the relationship between lateral pressure and time and displacement, a theoretical calculation method of formation stress and displacement caused by slotted underground continuous wall is established. Considering the characteristics of slotted underground continuous wall, taking into account the limit case, the effective earth pressure distribution around the continuous diaphragm wall in the initial stage of excavation takes into account the earth pressure calculation formula related to time and displacement; After excavation, the stress around the trenches will be redistributed under the effect of far-field stress. By using the variational principle and the conformal transformation method, the stress calculation formula after redistribution can be calculated. On this basis, the analysis of underground continuous wall The problem of stress transfer in the horizontal direction and the load transfer in the vertical direction during the construction of the rectangular groove are established. The calculation model of settlement around the underground continuous wall trough is established. The settlement of the ground under the three-dimensional stress state is obtained by Mindlin solution Analytical solution. Through the simulation, the theoretical results are applied to relying on the project. Compared with the actual monitoring results, the result of the theory is correct and feasible, which provides a theoretical basis for avoiding the construction risk of the diaphragm wall.