软土地基上加筋土挡墙的性能研究

发布时间：2018-02-20 23:06

本文关键词： 软土地基加筋土挡墙固结数值模拟稳定性可靠度　出处：《福州大学》2013年硕士论文　论文类型：学位论文

【摘要】：加筋土挡墙是由填土和在填土中布置的一定数量的筋体以及墙面板三部分组成的一个整体复合结构。加筋土挡墙因具有造价低、施工简便、造型美观、对地基要求不高、变形协调能力强、抗震性能好等优点在全世界范围内广泛的应用。对于建造在坚硬地基上的加筋土挡墙的工作性能的研究,国内外学者开展了大量的试验和理论研究,且很多现行的设计准则是基于这些研究成果的。但对于在软弱地基上修建加筋土挡墙,国内外的研究甚少,理论研究明显滞后于工程应用,设计规范也没有考虑软土地基对加筋土挡墙的影响。为此,本文针对修建在软土地基上的加筋挡墙进行较为系统的研究。主要内容有：简要介绍一实际修建在软土地基上的加筋挡墙工程,并利用有限元软件Plaxis 8.5进行模拟,将数值计算结果与实测结果进行对比,验证使用有限元方法模拟实际问题的可行性。详细分析了软土地基上加筋挡墙的变形特征、力学性能以及加筋体应变拉力分布规律。在此基础上,进一步系统的分析影响加筋挡墙性能的关键因素,包括加筋间距、加筋长度、筋材刚度、填土强度、填土刚度、筋土界面强度等。具体分析了加筋土挡墙墙面水平位移、墙底沉降、墙背水平土压力、基底竖向应力等随软土地基固结沉降的变化,并讨论了挡墙施工过程对挡墙性能的影响。本文针对软弱地基土的各项参数如软弱土层的强度、刚度、软土层相对于挡墙的位置等对上部加筋挡墙的影响进行较深入的讨论。采用有限元强度折减法和极限平衡法分别计算软基上加筋土挡墙的安全系数,并对二者计算结果进行对比,讨论软土地基加筋土挡墙的稳定性。较为系统的讨论了加筋挡墙各个组成部分对其稳定性的影响,如筋土界面强度、填土强度参数、加筋间距、加筋长度。利用概率分析方法对软基上加筋挡墙的稳定性进行可靠度分析,通过Geo-Slope软件计算得到能定量评估边坡的稳定性或风险水平的破坏概率和可靠性指标。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]:Reinforced earth retaining wall is an integral composite structure composed of a certain number of reinforcement and wall panels arranged in the fill. Because of its low cost, simple construction, beautiful shape and low requirement for foundation, reinforced earth retaining wall has the advantages of low cost, simple construction and beautiful shape. The advantages of strong deformation coordination ability and good seismic performance are widely used all over the world. For the study of the working performance of reinforced earth retaining wall built on hard foundation, domestic and foreign scholars have carried out a large number of experiments and theoretical studies. Many of the current design criteria are based on these research results. However, there are few studies at home and abroad on the construction of reinforced earth retaining wall on weak foundation, and the theoretical research is obviously lagging behind the engineering application. The design code also does not take into account the influence of soft soil foundation on reinforced earth retaining wall. In this paper, the reinforced retaining wall built on soft soil foundation is studied systematically. The main contents are as follows: a practical reinforced retaining wall project built on soft soil foundation is briefly introduced, and the finite element software Plaxis 8.5 is used to simulate it. By comparing the numerical results with the measured results, the feasibility of using finite element method to simulate practical problems is verified. The deformation characteristics of reinforced retaining wall on soft soil foundation are analyzed in detail. On the basis of this, the key factors affecting the performance of reinforced retaining wall are analyzed systematically, including reinforcement spacing, reinforcement length, reinforcement stiffness, fill strength, fill stiffness. The horizontal displacement of reinforced retaining wall, the settlement of the bottom of the wall, the horizontal earth pressure on the back of the wall and the vertical stress of the base are analyzed with the consolidation settlement of the soft soil foundation. The influence of the construction process of the retaining wall on the performance of the retaining wall is discussed. The influence of the position of soft soil layer relative to the retaining wall on the upper reinforced retaining wall is discussed in depth. The safety factor of reinforced earth retaining wall on soft foundation is calculated by using the finite element strength reduction method and the limit equilibrium method, respectively. The stability of reinforced earth retaining wall on soft soil foundation is discussed, and the influence of each component of reinforced retaining wall on its stability is discussed systematically, such as the interface strength of reinforced soil, the strength parameter of fill soil, the spacing of reinforcement, and so on. The reliability of reinforced retaining wall on soft foundation is analyzed by using probability analysis method. The failure probability and reliability index which can quantitatively evaluate the slope stability or risk level are obtained by Geo-Slope software. The main conclusions of this paper are summarized and the shortcomings and prospects of the research are pointed out.
【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

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