基坑土钉支护应力和加固机理分析

通过有限元数值分析软件ANSYS对深基坑开挖与土钉支护的全过程进行了模拟。分析研究了施加土钉前后基坑坡体的应力与变形特性、土钉轴力分布规律以及坡体潜在破裂面的位置。通过对比无土钉和施加土钉两种情况的土中主应力变化及摩尔圆分析,说明了土钉支护的加固机理和效果。文中还给出了土钉和面层的内力分布规律。研究结果对基坑土钉墙支护的设计与施工具有一定的参考价值。

Analysis on Stress Properties for Soil-nail-reinforced Foundation Pit

The whole procedure of a foundation pit's excavation and it's soil-nailing support is simulated with the FEM software ANSYS. Based on the results, the stress redistribution and the deformation properties of the foundation pit are discussed in the case with and without soil-nailing support, the axial stresses of soil-nailing distribution of different load steps and the location of the potential sliding surface in the foundation pit are also discussed. The soil-nailing support's reinforcement mechanics and it's effect are represented by comparison of principal stress in the case with and without soil-nailing support and analysis of Mohr circles. The rules of the internal forces and the surface layer are analyzed. The research results are valuable to the similar design and construction of Soil-nail-reinforced Foundation.