深基坑复合土钉墙受力性能的计算机模拟分析

为了揭示土钉+水泥土搅拌桩复合土钉墙的受力规律,采用数值模拟方法,建立了整体三维有限元计算模型,模型考虑了基坑的空间作用,克服了二维平面或局部三维有限元模型的不足,模拟了复合土钉墙的施工过程,分析了土钉的轴力,计算结果表明:(1)基坑的"角点效应"对土钉轴力的影响范围约为0.5倍的开挖深度;(2)每排土钉轴力峰值处距开挖面0.2~0.25倍的钉长;(3)中下部土钉受力较大.

Computer Simulation Analysis of Stress of Composite Soil Nail Wall in Deep Foundation Pit Excavation

In order to reveal the laws of the stress of the composite soil nail wall of soil nails and cement-soil piles,a whole three-dimensional finite element calculation model was established on the basis of the numerical simulation method,which considered the spatial action of the foundation pit and overcome the deficiencies of two-dimensional plane model or a partial spatial one.The construction process of the composite soil nail wall was simulated and the axial forces of the soil nails were analyzed.The calculation results showed that:(1) The influence of the corner of the foundation pit was about 0.5 times of the depth of the excavation on axial forces of soil nails,(2) The location of maximal axial force of every row soil nails was 0.2- 0.25 times of the length of soil nail from the excavation face,(3) Axial forces of the middle and lower soil nails were bigger.