岩土类边坡稳定性分析及加固设计

发布时间：2018-06-10 05:44

本文选题：边坡稳定 + 刚体极限平衡法　；参考：《湖北工业大学》2013年硕士论文

【摘要】：随着人类社会的发展，全球每年因边坡失稳而引发的边坡灾害给人民造成了巨大的伤害。边坡稳定性研究及边坡加固已成为岩土界学者研究的重要课题。刚体极限平衡法和有限元法都广泛应用于边坡稳定性评价，其中极限平衡法的力学模型比较简单，可对边坡稳定性进行定量分析。有限元法能够建立边坡的三维有限元模型，其能考虑土体的应力~应变性质，可对边坡进行施工阶段模拟和稳定性分析。在经过长期的工程实践应用后，两种方法都已积累丰富的使用经验。预应力锚索抗滑桩是一种新型有效的边坡加固措施，在边坡工程中使用的越来越多，但其实践应用却超前于理论研究，由于桩锚体系与土体之间相互作用的复杂性，导致目前计算方法的不足。本文以实际工程为背景，采用有限元分析软件MIDAS-GTS对预应力抗滑桩进行数值模拟研究。本文的主要工作内容为：（1）介绍了边坡稳定性研究的历史和进展，，简述了目前常用的边坡加固措施。（2）探讨了边坡病害的类型和影响边坡稳定的各种内外因，介绍了几种常用的边坡稳定性分析方法及其优缺点。（3）简述了有限元法的基本原理，有限元模型中土体的本构模型，抗滑桩、锚索结构、接触面的数值模拟和有限元解的收敛性。（4）采用有限元分析软件MIDAS-GTS建立二维预应力锚索抗滑桩加固边坡的源模型，在考虑桩土接触、锚索与土体接触、桩锚协调变形的条件下，分析了预应力锚索抗滑桩的基本工作原理与力学作用。采用单因素分析法，分析了锚索预应力、桩的抗弯刚度、锚索刚度对预应力锚索抗滑桩桩身内力、位移的影响。（5）采用极限平衡法和有限元强度折减法对深圳南澳水头沙村平安宝昌永耀珠宝来料加工厂边坡治理工程进行稳定性分析。在考虑桩土接触、锚索与土体接触、桩锚协调变形的条件下，利用MIDAS-GTS软件建立三维有限元加固模型，模拟边坡治理的施工过程，对施工后边坡的稳定性、预应力锚索抗滑桩的内力、变形和锚索拉力进行了分析。
[Abstract]:With the development of human society, slope disasters caused by slope instability in the world cause great harm to people every year. The study of slope stability and slope reinforcement has become an important subject for geotechnical scholars. Rigid body limit equilibrium method and finite element method are widely used in slope stability evaluation, and the mechanical model of limit equilibrium method is simple, which can be used for quantitative analysis of slope stability. The finite element method can establish the three-dimensional finite element model of the slope, which can consider the stress-strain property of the soil, and can simulate and analyze the stability of the slope in the construction stage. After a long period of engineering practice, both methods have accumulated rich experience in use. Pre-stressed anchor cable anti-slide pile is a new and effective method for slope reinforcement, which is used more and more in slope engineering. However, its practical application is ahead of the theoretical research. Due to the complexity of the interaction between the pile-anchor system and the soil, the present calculation method is insufficient. In this paper, the finite element analysis software MIDAS-GTS is used to simulate the prestressed anti-slide pile. The main contents of this paper are as follows: 1) the history and progress of slope stability research are introduced, and the commonly used slope reinforcement measures are briefly described. The types of slope diseases and various internal and external factors affecting slope stability are discussed. This paper introduces several commonly used slope stability analysis methods and their advantages and disadvantages. (3) the basic principle of finite element method (FEM), the constitutive model of soil mass in finite element model, anti-slide pile, anchor cable structure, etc. Numerical simulation of contact surface and convergence of finite element solution. The finite element analysis software MIDAS-GTS is used to establish the source model for reinforcement of slope with two-dimensional prestressed anchor cable anti-slide pile. Under the condition of considering pile-soil contact, contact between anchor cable and soil, and coordinated deformation of pile and anchor, The basic working principle and mechanical action of prestressed Anchorage cable anti-slide pile are analyzed. In this paper, single factor analysis method is used to analyze the internal force of prestressed cable prestressed pile, pile bending stiffness and anchor cable stiffness on prestressed anchor cable anti-slide pile body. The influence of displacement. The stability analysis of slope treatment of Ping an Bao Changyao Jewelry processing Plant in Shuitousha Village, Nanao, Shenzhen is carried out by using limit equilibrium method and finite element strength reduction method. Under the condition of considering the contact between pile and soil, the contact between anchor cable and soil, and the coordinated deformation of pile and anchor, the 3D finite element reinforcement model is established by using MIDAS-GTS software, and the construction process of slope treatment is simulated, and the stability of slope after construction is simulated. The internal force, deformation and cable tension of prestressed anchor-cable anti-slide pile are analyzed.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU43

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