湖相沉积软土地区高速公路路基沉降规律研究

发布时间：2018-05-16 00:28

本文选题：软土特性 + 软土地基处理　；参考：《石家庄铁道大学》2015年硕士论文

【摘要】：改革开放以来,我国的经济实力不断提高,高速公路建设得到了迅猛发展,为地质及岩土工程的发展提供了有利条件,同时也对地质及岩土工程提高了要求以应对兴建现代高速公路的需要。我国沿海及内陆平原、山区广泛分布着饱和软土,在这类软土地基上修建高速公路难度极大,为了防止路基失稳或者过度沉降的出现,必须对地基进行加固处理,否则,极易对工程的建设和公路的正常使用造成不可估量的影响。在当今社会已经积累了很多处理软土地基的方法和经验。本文主要依托邢衡高速公路衡水段一期工程对长短桩复合地基、强夯法、水泥搅拌桩复合地基进行研究。分别对三种地基处理方式的作用机理以及现场施工要点进行分析。沉降是高速公路地基处理及路基填筑质量检测的重要指标之一,沉降监测是最直观了解高速公路沉降情况的方式。高速公路工程中路基不均匀沉降量的大小直接关系到在工程完工通车后道路的使用是否能够达到要求,过大的沉降差会导致路面开裂,甚至路基失稳塌陷,所以对高速公路工程进行沉降监测工作以进行施工控制是非常必要的。本文使用ABAQUS软件分别对三种不同地基处理方法进行模拟,根据施工中实测所得数据与有限元模拟计算所得数据进行校核分析,对高速公路地基发生下降的原因进行了细致的分析,从而深入挖掘高速公路地基下沉的规律。在得到不同工况不同施工时期的沉降数据后,对不同条件下高速公路软土路基沉降的规律进行研究。通过数学的方法对沉降监测中所得到的实测数据进行相应的数据拟合,通过拟合得到的曲线图预测出后期沉降变化,以便对未来的施工采取相应合理的施工控制措施。
[Abstract]:Since the reform and opening up, the economic strength of our country has been continuously improved, and the highway construction has been developed rapidly, which provides favorable conditions for the development of geological and geotechnical engineering. At the same time, the geological and geotechnical engineering requirements are raised to meet the needs of modern highway construction. The saturated soft soil is widely distributed in the coastal and inland plains of our country. It is very difficult to build expressway on this kind of soft soil foundation. In order to prevent the subgrade from unstable or excessive settlement, the foundation must be strengthened or treated. It is easy to cause incalculable influence on the construction of engineering and the normal use of highway. In today's society, many methods and experiences have been accumulated to deal with soft soil foundation. Based on the first stage of Hengshui section of Xingheng Expressway, this paper studies the composite foundation of long and short piles, dynamic compaction and cement mixing piles. The action mechanism of three kinds of foundation treatment methods and the key points of site construction are analyzed respectively. Settlement is one of the most important indexes of expressway foundation treatment and subgrade filling quality detection, and settlement monitoring is the most intuitionistic way to understand expressway settlement. The magnitude of uneven settlement of roadbed in expressway engineering is directly related to whether the use of road can meet the requirements after the completion of the project. The excessive settlement difference will lead to pavement cracking and even subgrade instability collapse. So it is very necessary to monitor the settlement of expressway engineering to control the construction. In this paper, three kinds of different foundation treatment methods are simulated by ABAQUS software, and checked and analyzed according to the measured data in construction and the data obtained from finite element simulation calculation. This paper makes a detailed analysis of the causes of the subgrade descent of the expressway, so as to excavate deeply the law of the foundation subsidence of the expressway. After obtaining the settlement data of different working conditions and different construction periods, the settlement law of soft soil subgrade of expressway under different conditions is studied. The measured data obtained in settlement monitoring are fitted by mathematical method, and the later settlement changes are predicted by the curves obtained in order to take appropriate construction control measures for future construction.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

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