交通荷载作用下滨海地区加固软土路基变形稳定性分析

发布时间：2018-01-12 03:03

本文关键词：交通荷载作用下滨海地区加固软土路基变形稳定性分析　出处：《青岛理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着基本建设的发展，在软土地区兴建公路、堤坝、机场、码头等项目将会日益增多，对地基的稳定性要求也在不断提高。由于软土具有高含水量、低密度、低强度、高压缩性、低透水性和中等灵敏度的基本特点，交通荷载作用下软土路基的变形稳定性分析一直是工程界普遍关心的问题，也是一个值得深入研究的课题。本文首先介绍了我国常采用的软土地基加固技术，研究了适合青岛高新区软土地基加固的最优方案，并分析加固后地基的各项物理、力学指标。然后介绍了交通荷载的特性和模拟实现问题，并选择采用半波正弦荷载模拟交通荷载。最后通过数值模拟，研究交通荷载作用下加固软土地基的变形和稳定性。本文采用理论分析和数值模拟相结合的方法研究交通荷载作用下加固软土地基的变形和稳定性，并取得了以下研究成果：（1）分别采用移动恒载和移动简谐荷载模拟交通荷载作用，将研究的路基简化为三维模型，采用数值分析法研究路基在两种荷载下的瞬态响应，最终选择采用移动简谐荷载模拟交通荷载。（2）应用数值模拟分析路基在移动简谐荷载作用下的动力响应，获得了加固软土路基在交通荷载作用下，，不同深度和宽度范围内的竖向位移、加速度和动应力变化规律。（3）研究了不同行车荷载、不同行车速度、不同路基刚度下的竖向位移、加速度和动应力的变化规律。本文采用的研究方法和成果可作为交通荷载作用下加固软土路基变形稳定性分析的依据和参考。
[Abstract]:With the development of capital construction, the construction of highway, dyke, airport, wharf and other projects in soft soil area will be increasing day by day, and the requirement of foundation stability will also be raised. Because soft soil has high water content and low density. The basic characteristics of low strength, high compressibility, low permeability and medium sensitivity. The analysis of deformation and stability of soft soil roadbed under traffic load is always concerned by the engineering field. It is also a subject worthy of further study. This paper first introduces the soft soil foundation reinforcement technology which is often used in our country, studies the optimum scheme of soft soil foundation reinforcement suitable for Qingdao High-tech Zone, and analyzes the physics of the strengthened foundation. Then the characteristics of traffic load and its realization are introduced, and the half-wave sinusoidal load is chosen to simulate traffic load. Finally, numerical simulation is carried out. The deformation and stability of soft soil foundation strengthened by traffic load are studied. In this paper, the deformation and stability of soft soil foundation under traffic load are studied by combining theoretical analysis and numerical simulation. The following research results are obtained: 1) the traffic load is simulated by moving dead load and moving harmonic load respectively. The subgrade is simplified as a three-dimensional model, and the transient response of roadbed under two loads is studied by numerical analysis. Finally, the moving harmonic load is used to simulate the traffic load. 2) using numerical simulation to analyze the dynamic response of roadbed under moving harmonic load, the vertical displacement in different depth and width of reinforced soft soil roadbed under traffic load is obtained. The change of acceleration and dynamic stress. The changes of vertical displacement, acceleration and dynamic stress under different driving loads, different driving speeds and different subgrade stiffness are studied. The research method and results used in this paper can be used as the basis and reference for the analysis of deformation stability of soft soil roadbed strengthened by traffic load.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1

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