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该文在超多维科技大厦基坑支护工程开挖实例的基础上,利用有限差分建立分析计算模型,以桩身侧向位移为主,综合分析了影响变形的因素。主要分析结果如下,不同的弹性模量、粘聚力及内摩擦角的设计取值对基坑变形有一定的影响,支护体侧向位移受土体参数变化的敏感性按大小依次为弹性模量、粘聚力、泊松比、内摩擦角。支护桩桩径的增大,桩体侧向变形减小。锚索倾角介于0°~35°之间,桩体最大变形量变化较小,倾角大于35°时,桩体最大位移量随倾角的变大增长较快。锚索预应力增大,支护桩体的最大侧向位移及桩顶位移减小,桩体侧向变形与预应力总体呈线性关系。
Based on the excavation example of the foundation pit supporting project of the ultra-dimensional science and technology building, the finite difference method is used to establish the analysis and calculation model, and the lateral displacement of the pile is the main factor. The factors affecting the deformation are comprehensively analyzed. The main analysis results are as follows. The design values of different elastic modulus, cohesion and internal friction angle have certain influence on the deformation of foundation pit. The sensitivity of the lateral displacement of support body to soil parameter changes according to the size is elastic Modulus, cohesion, Poisson’s ratio, internal friction angle. With the increase of pile diameter, the lateral deformation of the pile is reduced. The inclination of anchor cable is between 0 ° ~ 35 °, and the maximum deformation of the pile body is small. When the inclination angle is greater than 35 °, the maximum displacement of the pile body increases rapidly with the increase of the inclination angle. The prestressing force increases, the maximum lateral displacement of supporting piles and the displacement of pile top decrease, and the lateral deformation of piles has a linear relationship with the prestress.