广东山区软土工程特性及软基处理应用研究

发布时间：2018-03-09 14:08

本文选题：山区软土　切入点：工程特性　出处：《东华理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：近几十年来随着广东地区经济的飞速发展,高速公路也相应的加快建设,越来越多的高速公路通往山区。由于山区地形地貌与平原地区有很大的不同,其工程地质条件复杂,所以在山区建设高速公路会遇到各种复杂问题,特别是山区软土地基的处理问题。山区软土与平原软土的物理力学性质虽然差别不大,但是山区软土具有自己独特的工程特性,采用平原地区的软土处理方法可能达不到预期的处理效果。故山区软土的工程特性及软基处理问题就成为了一个具有重要意义的研究课题。本文依托广东山区在建高速公路工程,针对山区软土的工程特性及软土地基处理方法做以下方面的工作。1.通过收集广东省山区多个典型工程勘察资料及相关地质资料,运用统计学对山区软土的物理力学指标进行统计分析。分析山区软土的形成原因、空间分布、颗粒组成成分及物理力学指标的特点,并分析各物理力学指标之间的相关性,找出各指标间的相关规律,并总结山区软土与平原软土工程特性的差异性。本文的统计分析成果对广东山区软土的认识及山区软土区工程建设具有借鉴意义。2.软土地基处理技术在我国已经发展的比较成熟,各种方法在工程实践中都得到应用。本文详细介绍了换填法、强夯法、排水固结法和复合地基法的基本原理,结合软基处理方法的原理分析各种方法的技术特点、施工工艺、适用范围等,并且介绍了软基处理方案的影响因素。3.本文依托广东山区在建高速公路工程,根据山区软土特性及工程特点,本文分析了两种典型的山区软基处理方法,即CFG桩法和管桩法。结合工程段预先埋置的沉降板等,监测软土地基的变形数据,并对两断面的变形数据进行对比,分析了管桩和CFG桩复合地基的处理效果,在经济与技术上综合分析了管桩和CFG桩复合地基处理山区软基的适用性。4.结合室内离心模型试验,分别模拟无软基处理、CFG桩及管桩处理山区软基。通过分级加速模拟路堤分层填筑过程,观测不同软基处理方法的路堤变形特性并分析软基处理的适用性。
[Abstract]:In recent decades, with the rapid development of Guangdong's economy, more and more freeways have been built, and more and more freeways are leading to mountainous areas. Because the terrain and landforms in mountainous areas are very different from those in plain areas, their engineering geological conditions are complex. Therefore, the construction of expressway in mountainous area will encounter various complicated problems, especially the treatment of soft soil foundation in mountainous area. Although the physical and mechanical properties of soft soil in mountainous area and plain are not different, the soft soil in mountain area has its own unique engineering characteristics. Using the soft soil treatment method in the plain area may not achieve the expected treatment effect. Therefore, the engineering characteristics and soft foundation treatment of soft soil in mountainous areas have become an important research topic. Highway construction, In view of the engineering characteristics of soft soil in mountainous areas and the methods of soft soil foundation treatment, the following work is done. 1. Through collecting the survey data and related geological data of several typical projects in mountainous areas of Guangdong Province, The physical and mechanical indexes of soft soil in mountainous area are analyzed by statistics. The formation reason, spatial distribution, particle composition and physical and mechanical properties of soft soil in mountainous area are analyzed, and the correlation between physical and mechanical indexes is analyzed. Find out the correlation between the indicators, And summarizes the difference between soft soil and plain soft soil engineering characteristics. The results of statistical analysis in this paper have reference significance for the understanding of soft soil in Guangdong mountainous area and the engineering construction of soft soil area in mountain area. 2. Soft soil foundation treatment technology has been developed in our country. The development is relatively mature, All kinds of methods have been applied in engineering practice. This paper introduces in detail the basic principles of replacement method, dynamic compaction method, drainage consolidation method and composite foundation method, and analyzes the technical characteristics and construction technology of various methods combined with the principle of soft foundation treatment method. Based on the highway project under construction in Guangdong mountainous area, according to the characteristics and engineering characteristics of soft soil in mountain area, this paper analyzes two typical soft foundation treatment methods in mountainous area. That is, CFG pile method and pipe pile method. The deformation data of soft soil foundation are monitored and compared with the deformation data of two sections. The treatment effect of pipe pile and CFG pile composite foundation is analyzed. In economic and technical aspects, the applicability of pipe pile and CFG pile composite foundation for soft foundation treatment in mountainous area is analyzed. 4. Combined with indoor centrifuge model test, The CFG pile without soft foundation treatment and the soft foundation treatment with pipe pile are simulated respectively. The deformation characteristics of embankment with different soft foundation treatment methods are observed and the applicability of soft foundation treatment is analyzed through the hierarchical acceleration simulation of embankment filling process.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU447

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