深厚淤泥中浅基坑支护变形分析
发布时间：2018-10-18 11:21
【摘要】：随着城市的发展和人口的增多，城市里必然会大量兴建高层建筑和充分利用地下空间，这样也促进了基坑工程的发展。基坑的开挖和施工，破坏了地基土原来的土压力平衡状态，必然会对周围环境造成影响。因此，开挖之前要求对坑壁进行安全可靠的支护，将基坑开挖对周围环境的影响控制在一定的范围内。然而基坑支护受到场地水文、工程地质条件，周边环境，施工的可行性和难度以及经济等因素限制。这就要求工程设计人员在充分考虑各种影响因素的条件下，做出安全、合理、经济的基坑支护方案和设计。 本文的主要研究内容如下： 1.归纳整理了常见的几种基坑支护类型，分析了它们各自的优缺点和适用范围，总结了基坑选型的原则和影响因素。 2.介绍了基坑开挖过程中支护结构、周围土体变形的一般规律和变形机理，确保了下文有限元计算结果的相对合理，为下一步对有限元计算结果的比较分析提供了依据。 3.结合实际工程，选取了双排桩和水泥土墙两种支护形式，进行了有限元模拟计算。对二者的有限元计算结果进行了分析比较，，选取了二者的支护结构水平位移，基坑外地表面沉降和基坑内土体隆起进行对比分析。
[Abstract]:With the development of the city and the increase of population, the city will build a large number of high-rise buildings and make full use of underground space, which will also promote the development of foundation pit engineering. Excavation and construction of foundation pit destroy the original earth pressure balance of foundation soil, which will inevitably affect the surrounding environment. Therefore, before excavation, the pit wall should be supported safely and reliably, and the influence of excavation on the surrounding environment should be controlled within a certain range. However, foundation pit support is restricted by hydrology, engineering geological conditions, surrounding environment, feasibility and difficulty of construction and economy. This requires engineering designers to make safe, reasonable and economical foundation pit support scheme and design under the condition of fully considering all kinds of influencing factors. The main contents of this paper are as follows: 1. Several common types of foundation pit support are summarized, their respective advantages, disadvantages and applicable scope are analyzed, and the principles and influencing factors of foundation pit selection are summarized. 2. This paper introduces the general rules and deformation mechanism of the supporting structure and surrounding soil during the excavation of foundation pit, which ensures the relative reasonableness of the following finite element calculation results. It provides the basis for the comparison and analysis of the finite element calculation results in the next step. 3. 3. Combined with practical engineering, two kinds of supporting forms of double row pile and cement soil wall are selected, and the finite element simulation calculation is carried out. The finite element calculation results of the two are analyzed and compared. The horizontal displacement of the supporting structure, the settlement of the outside surface of the foundation pit and the uplift of the soil in the foundation pit are selected for comparative analysis.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU470
本文编号：2278976
[Abstract]:With the development of the city and the increase of population, the city will build a large number of high-rise buildings and make full use of underground space, which will also promote the development of foundation pit engineering. Excavation and construction of foundation pit destroy the original earth pressure balance of foundation soil, which will inevitably affect the surrounding environment. Therefore, before excavation, the pit wall should be supported safely and reliably, and the influence of excavation on the surrounding environment should be controlled within a certain range. However, foundation pit support is restricted by hydrology, engineering geological conditions, surrounding environment, feasibility and difficulty of construction and economy. This requires engineering designers to make safe, reasonable and economical foundation pit support scheme and design under the condition of fully considering all kinds of influencing factors. The main contents of this paper are as follows: 1. Several common types of foundation pit support are summarized, their respective advantages, disadvantages and applicable scope are analyzed, and the principles and influencing factors of foundation pit selection are summarized. 2. This paper introduces the general rules and deformation mechanism of the supporting structure and surrounding soil during the excavation of foundation pit, which ensures the relative reasonableness of the following finite element calculation results. It provides the basis for the comparison and analysis of the finite element calculation results in the next step. 3. 3. Combined with practical engineering, two kinds of supporting forms of double row pile and cement soil wall are selected, and the finite element simulation calculation is carried out. The finite element calculation results of the two are analyzed and compared. The horizontal displacement of the supporting structure, the settlement of the outside surface of the foundation pit and the uplift of the soil in the foundation pit are selected for comparative analysis.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU470
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