基于实测资料的高速公路软基长期沉降研究

发布时间：2018-01-11 23:09

本文关键词：基于实测资料的高速公路软基长期沉降研究　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：在软土地基上修建高速公路往往出现沉降过大、裂缝等公路病害,影响高速公路的使用效益,因此,软土地基高速公路的工后沉降值得重点关注和研究。本文基于连盐高速公路连云港段与崇明至启东长江公路大桥(江苏境)接线工程的实测资料,从各个角度比较这两个区域地基工后沉降的影响因素,主要内容包括：(1)对两个区域软土地基的成因以及工程地质条件进行对比分析并且对工后第一年与第二年沉降的总体变化规律进行了详细的统计分析。(2)分别采用修正双曲线法、指数曲线法以及灰色Verhulst模型预测方法预测沉降,并通过相对误差与相关系数对沉降预测效果进行评价,得出修正双曲线法较适用于连盐高速的沉降预测,灰色Verhulst模型在崇启接线工程路基沉降预测中效果较优。(3)填土高度和软土厚度均与工后沉降呈正相关性；连盐三种地基处理方式在控制软土路基工后沉降方面的效果由高到底依次为：粉喷桩湿喷桩片石+砼,崇启四种地基处理方式在控制软土路基工后沉降方面的效果由高到底依次为：PHC管桩湿喷桩+堆载预压湿喷桩堆载预压。(4)运用ABAQUS软件针对两区域典型断面分别建立两个有限元模型,一是不考虑土体的蠕变特性,二是考虑土体的蠕变特性,以此来分析工后沉降中由蠕变引起的沉降大小及发展变化规律。
[Abstract]:Highway construction on soft soil foundation is often caused by excessive settlement, cracks and other highway diseases, which affect the efficiency of highway use. The post-construction settlement of soft ground expressway is worthy of attention and research. This paper is based on the measured data of Lianyungang section of Lianyan Expressway and the connection project between Chongming and Qidong Yangtze River Highway Bridge (Jiangsu boundary). The influence factors of foundation settlement in these two regions are compared from various angles. The main contents include: (1) Comparative analysis of the causes of formation and engineering geological conditions of the soft ground in the two regions, and detailed statistical analysis of the overall variation of settlement in the first year and the second year after construction. (. 2) the modified hyperbolic method was used respectively. The exponential curve method and grey Verhulst model are used to predict the settlement, and the relative error and correlation coefficient are used to evaluate the effect of settlement prediction. It is concluded that the modified hyperbolic method is more suitable for predicting the settlement at high speed. The grey Verhulst model has a positive correlation with post-construction settlement in the prediction of roadbed settlement in Chongqi connection Project. The height of fill and the thickness of soft soil are all positively correlated with the settlement of the roadbed after construction. The effect of three kinds of ground treatment with salt in controlling the settlement of soft soil subgrade after construction is as follows: powder jet pile wet jet pile stone concrete. The effect of the four kinds of foundation treatment methods in controlling the settlement of soft soil subgrade after construction is from high to high in the order of: PHC pipe pile, wet jet pile, pile load, wet jet pile, pile load, pile load, preload, etc.). Two finite element models for typical sections of two regions are established by using ABAQUS software. One is that the creep characteristics of soil are not considered, the other is considering the creep characteristics of soil, so as to analyze the settlement size caused by creep and the law of development and change in post-construction settlement.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U416.1

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