毛乌素沙漠高填方路基的稳定性研究

发布时间：2019-02-15 07:45

【摘要】：二十世纪九十年代后期以来,随着我国西部交通建设的快速发展,在沙漠地区已修筑了许多高填方路基,这与以往采用“沿地爬,低路堤(小于5m)”的设计原则及经验不符合。但关于沙漠高填方路基的设计与防护技术及工程经验,目前缺乏系统的研究和总结。风积沙高填方路基稳定性是沙漠高速公路建设中遇到的主要技术问题之一。因此,本文针对已建成的210国道榆林过境线高填方路基工程的后期运营状况,对风积沙高填方路基的稳定性开展了研究。主要内容如下:1.对国内外沙漠公路的相关资料开展调研和现场调查,对毛乌素沙漠风积沙的物理性质和工程力学性质开展了试验分析,提出了有关的统计规律。2.在国内外资料调研及工程现场调查的基础上,对沙漠地区高填方路基稳定性的影响因素、破坏特点及理论分析方法开展研究,提出了针对风积沙高填方路基稳定性的计算模型与理论方法。3.对桥头高填方非均质路基,采用Midas/GTS软件分析不同的边界条件、网格划分、单元阶次等对高填方路基稳定性计算结果精度的影响,按均质路基和非均质路基稳定性分析的两种情况,将有限元数值模拟结果与理论分析的计算结果进行对比。4.利用数值模拟分析不同风积沙填料的力学指标、模型参数和几何断面尺寸对风积沙路基稳定性系数的影响及变化规律。结果表明:风积沙填料的弹性模量、泊松比以及路基高度和宽度对路基整体稳定性影响相对较小,填料的内摩擦角及路基边坡坡比对稳定性影响显著。5.在对210国道榆林过境线高填方路基后期运营状况现场调查、数值模拟分析及理论分析基础上,对毛乌素沙漠地区典型风积沙高填方路段进行实例计算,提出毛乌素沙漠高填方路基设计与防护技术。
[Abstract]:Since the late 1990s, with the rapid development of traffic construction in the west of China, many high fill subgrade has been built in desert areas, which is similar to the previous use of "climbing along the ground." The design principle and experience of low embankment (less than 5m) are not consistent. However, there is a lack of systematic research and summary on the design and protection technology and engineering experience of desert high embankment. The stability of high-fill embankment with aeolian sand is one of the main technical problems in desert highway construction. Therefore, this paper studies the stability of wind-sand high filling embankment according to the later operation condition of Yulin transit line high fill roadbed of 210 national highway. The main contents are as follows: 1. The related data of desert highway at home and abroad were investigated, and the physical and engineering mechanical properties of eolian sand in Maowusu desert were tested and analyzed, and the related statistical rules were put forward. On the basis of domestic and foreign data investigation and engineering field investigation, the factors affecting the stability of high embankment subgrade in desert area, the damage characteristics and the theoretical analysis methods are studied. The calculation model and theoretical method for stability of embankment with aeolian sand height are put forward. In this paper, the influence of different boundary conditions, grid division and unit rank on the accuracy of stability calculation results of high filling subgrade is analyzed by using Midas/GTS software for non-homogeneous embankment with high filling at bridgehead. According to the two conditions of stability analysis of homogeneous subgrade and heterogeneous roadbed, the finite element numerical simulation results are compared with the calculated results of theoretical analysis. 4. The influence of model parameters and geometric section size on the stability coefficient of eolian sand subgrade was analyzed by numerical simulation. The results show that the elastic modulus, Poisson's ratio and the height and width of the roadbed have relatively little influence on the overall stability of the roadbed, and the internal friction angle of the filler and the slope ratio of the side of the roadbed have significant effects on the stability of the roadbed. On the basis of field investigation, numerical simulation and theoretical analysis of the late stage operation of high fill roadbed in Yulin transit line of National Highway 210, the typical wind-sand filling section in Maowusu desert is calculated as an example. The design and protection technology of high fill roadbed in Maowusu desert are put forward.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

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