吴楚大道软土路基沉降预测研究

发布时间：2018-08-15 19:44

【摘要】：2008年以来,作为武汉城市圈核心层的鄂州市已进入一个全新的发展阶段。现有交通体系已不能满足城市规划的发展,为改善现有交通状况,加快城区发展,建设吴楚大道刻不容缓。但由于项目所处地质情况复杂,其中软土地基较多,有些区域淤泥厚度甚至高达6m,如果软土路基处理不当,不仅工程质量难以得到保证,也给公路投入运营带来隐患。因此对于软土路基,如何准确预测施工期沉降及工后沉降将直接影响到工程质量是否能够满足国家路网规划中的高品质、高安全和经济合理的要求。本文依据吴楚大道工程(西段)第2标段实际情况,结合工程前期地质勘查资料及后期在实验室取得的试验数据,对所选取的代表该标段三种工况的三个典型断面进行沉降分析,采用曲线拟合法和FLAC3D数值模拟法进行计算。通过对两种方法的结果对比分析,双曲线拟合法的拟合结果比FLAC3D数值模拟法的拟合结果更加贴近实测沉降数据。这说明双曲线拟合法更适合本工程的实际情况,可以应用于本标段其他路段的沉降预测。在本工程的一般路段,应用双曲线法便可以得到较好的拟合结果。但是对于一些土体性状发生较大变化的界面,可作为特殊路段应用FLAC3D数值模拟法进行模拟计算。但需要对参数及模型的选取严格把关,使误差降低至要求范围内。本文对三个典型断面的沉降预测分析结果对吴楚大道项目及其他类似软土路基工程具有一定的参考价值。
[Abstract]:Since 2008, as the core layer of Wuhan City Circle, Ezhou City has entered a new stage of development. The existing traffic system can not meet the development of urban planning, in order to improve the existing traffic situation and speed up the development of urban areas, the construction of Wuchu Avenue is urgent. However, because of the complex geological conditions of the project, there are more soft soil foundations, and in some areas the thickness of silt is as high as 6 m. If the soft soil subgrade is not treated properly, it is not only difficult to guarantee the engineering quality, but also brings hidden trouble to the operation of the highway. Therefore, for soft soil subgrade, how to accurately predict the settlement during construction period and after construction will directly affect whether the quality of the project can meet the requirements of high quality, high safety and reasonable economy in the national road network planning. According to the actual situation of the second section of Wuchu Avenue Project (West Section), combined with the geological exploration data of the early stage of the project and the experimental data obtained in the laboratory at the later stage, The settlement analysis of three typical sections representing the three working conditions of the section was carried out, and the curve fitting method and FLAC3D numerical simulation method were used to calculate the settlement. By comparing and analyzing the results of the two methods, the fitting result of hyperbolic fitting method is closer to the measured settlement data than that of FLAC3D numerical simulation method. This shows that the hyperbolic fitting method is more suitable for the actual situation of the project and can be applied to the settlement prediction of other sections of this section. In the general section of the project, the hyperbolic method can be used to obtain better fitting results. However, for some interfaces where soil behavior has changed greatly, FLAC3D numerical simulation method can be used as a special section of road to simulate and calculate. However, the selection of parameters and models should be strictly checked to reduce the error to the required range. The results of settlement prediction of three typical sections in this paper have certain reference value for Wuchu Avenue Project and other similar soft soil subgrade projects.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

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