不排水悬浮桩复合地基固结解析理论研究

发布时间：2018-03-02 03:37

本文关键词： 不排水桩复合地基固结解析解加固区下卧层　出处：《上海理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：复合地基固结理论是复合地基理论的重要组成部分。目前散体材料桩复合地基的固结分析计算问题上已经进行了比较深入的研究，但对于不排水桩（例如水泥土桩）复合地基的固结计算研究很少。针对这一课题进行深入研究既有重要的理论意义又有实际应用价值。本文对不排水悬浮桩复合地基的固结解析理论进行了分析研究，主要工作如下： 1.利用Plaxis有限元分析软件对不排水悬浮桩复合地基的固结特性进行了数值模拟分析，为不排水悬浮桩复合地基固结解析解的建立奠定了基础。 2.在等应变假定的基础上，推导出在瞬时加荷情况下不排水悬浮桩复合地基加固区桩间土和下卧层土各自的固结方程。在双层地基固结理论的基础上，建立了不排水悬浮桩复合地基的固结解析解，包括分别按沉降定义和孔压定义的复合地基固结度解答。根据提出的复合地基固结度的解析解，分析了相对加固深度、置换率以及桩与桩间土模量比对复合地基固结速率的影响。 3.分别建立了不排水悬浮桩复合地基加固区桩间土和下卧层土固结解析解。分析了置换率和桩土模量比对各自固结速率的影响。最后，将不排水悬浮桩复合地基的加固区简化为下卧层的半透水边界，给出了半透水边界厚度的计算公式，建立了下卧层固结度的简化计算方法。
[Abstract]:Consolidation theory of composite foundation is an important part of composite foundation theory. However, the consolidation calculation of undrained pile (such as cement soil pile) composite foundation is seldom studied. It has important theoretical significance and practical application value to further study this subject. This paper is of great value to the composite of undrained suspended pile. The analytical theory of foundation consolidation is analyzed and studied. The main tasks are as follows:. 1. The consolidation characteristics of undrained suspension pile composite foundation are simulated and analyzed by using Plaxis finite element analysis software, which lays a foundation for the establishment of consolidation analytical solution of undrained suspension pile composite foundation. 2. On the basis of the assumption of equal strain, the consolidation equations of soil between piles and substratum soil in the consolidation zone of undrained suspended pile composite foundation under instantaneous loading are derived. On the basis of the consolidation theory of double-layer foundation, An analytical solution of consolidation of composite foundation with undrained suspended pile is established, including the solution of consolidation degree of composite foundation according to the definition of settlement and pore pressure, respectively. According to the analytical solution of consolidation degree of composite foundation, the relative reinforcement depth is analyzed. The effect of replacement rate and the ratio of soil modulus between pile and pile on consolidation rate of composite foundation. 3. The analytical solutions of the consolidation of soil between piles and subsoil in the consolidation zone of undrained suspended pile composite foundation are established respectively. The effects of replacement rate and ratio of modulus of pile to soil on the consolidation rate are analyzed. The consolidation zone of undrained suspended pile composite foundation is simplified as the semi-permeable boundary of the underlying layer. The formula for calculating the thickness of the semi-permeable boundary is given, and the simplified calculation method for the consolidation degree of the underlying layer is established.
【学位授予单位】：上海理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU470

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