软土地基上柔性加筋挡土墙的承载机理

发布时间：2018-04-27 18:34

本文选题：软土地基 + 柔性加筋土挡墙　；参考：《福州大学》2013年硕士论文

【摘要】：国内外对刚性地基上的加筋土挡墙性能的试验和理论研究已做了很多,但是对于对软弱地基上加筋土挡墙整体性能的研究还很少。所以,目前的计算理论和方法是基于刚性地基的研究成果,按照普通的加筋挡土墙的设计理论所设计的返包式加筋挡土墙,虽然在刚性地基上已经得到了成功的应用,但对于在软土地基上的应用却一直不尽人意。为此,本文针对修建在软土地基上的柔性加筋挡墙进行较为系统的研究。主要内容有：引用Bergado (2000)和Tanchaisawat (2008)针对Bergado (1995)在泰国曼谷做的软基上的加筋挡土墙的现场试验而进行的数值计算结果与本文的数值计算(HSS)结果进行比较,验证采用有限方法模拟实际工程的可行性。以上述试验挡墙为基本模型分析了墙厚、地基土强度和地下水位对地基承载力的影响。采用有限元法模拟室内三轴试验、剪切试验和拉拔试验,分析上覆土压力、拉力、加筋体长度、加筋体间距、接触面、土体压缩模量和土体强度对加筋土的内部稳定性的影响。此外,针对加筋土的拉拔试验提出解析法并与有限元法进行比较,验证两者的可行性。为了更形象地分析软土地基和面板形式对加筋挡土墙的内力和变形的影响,文章还分别通过与坚硬地基和刚性面板的加筋挡土墙的内力和变形进行了详细的比较,分析了墙厚、加筋体的刚度、加筋体间距、地基土的压缩模量、地基土的渗透系数和地基土的强度对返包式加筋挡墙的内力和变形的影响。采用极限平衡法和有限元强度折减法分别对挡墙的安全系数进行分析,并比较两者的计算结果。采用有限元法分析墙厚、加筋体的刚度、加筋体间距、填土的强度、地基土的压缩模量和地基土的强度对返包式加筋挡土墙的破坏模式的影响,并与坚硬地基的挡墙进行比较。总结本文得出的主要结论,并指出研究的不足之处和研究展望。
[Abstract]:A lot of experiments and theoretical studies have been done on the performance of reinforced earth retaining wall on rigid foundation at home and abroad, but there is little research on the overall performance of reinforced earth retaining wall on soft foundation. Therefore, the current calculation theory and method is based on the research results of rigid foundation, according to the design theory of common reinforced retaining wall, the backpack reinforced retaining wall has been successfully applied in rigid foundation. However, the application in soft soil foundation has been unsatisfactory. In this paper, the flexible reinforced retaining wall built on soft soil foundation is studied systematically. The main contents are as follows: Bergado 2000) and Tanchaisawat 2008) are compared with the results of numerical calculation in this paper in view of the field test of reinforced retaining wall on soft foundation made by Bergado 1995) in Bangkok, Thailand. The feasibility of using finite method to simulate practical engineering is verified. The influence of wall thickness, soil strength and groundwater level on the bearing capacity of the foundation is analyzed based on the above experimental retaining wall. The effects of overlying earth pressure, tensile force, reinforced body length, reinforced body spacing, contact surface, soil compression modulus and soil strength on the internal stability of reinforced soil were analyzed by means of finite element method (FEM) to simulate the indoor triaxial test, shear test and drawing test, and to analyze the influence of overlying earth pressure, tensile force, reinforced body length, contact surface, soil compression modulus and soil strength on the internal stability of reinforced soil. In addition, an analytical method is proposed for the drawing test of reinforced soil and compared with the finite element method to verify the feasibility of the two methods. In order to analyze more vividly the influence of soft soil foundation and slab form on the internal force and deformation of reinforced retaining wall, the paper also compares the internal force and deformation of reinforced retaining wall with hard foundation and rigid slab in detail, and analyzes the thickness of the wall. The influence of the stiffness of reinforced body, the spacing of reinforced body, the compression modulus of foundation soil, the permeability coefficient of foundation soil and the strength of foundation soil on the internal force and deformation of backpack reinforced retaining wall. The limit equilibrium method and the finite element strength reduction method are used to analyze the safety factor of the retaining wall, and the calculated results are compared. The effects of wall thickness, stiffened body stiffness, stiffened body spacing, strength of fill, compression modulus of foundation soil and strength of foundation soil on the failure mode of reinforced retaining wall are analyzed by finite element method, and compared with those of hard foundation retaining wall. This paper summarizes the main conclusions, and points out the deficiencies and research prospects.
【学位授予单位】：福州大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU447;TU476.4

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