滨海路堤桥头过渡段地基处理关键技术研究

发布时间：2018-01-28 08:07

  本文关键词： 滨海路堤 桥头过渡段 地基处理 软土工程特性 泡沫混凝土 桩承式加筋路堤 沉降 稳定 极限平衡法 有限元　出处：《浙江工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：滨海路堤桥头过渡段地基处理成效事关公路工程质量和运营安全,是滨海深厚软土区域高等级公路行车舒适性的关键技术保障之一。本文研究立足于乐清湾港区疏港公路建设,首先,通过对乐清湾港区41只钻孔、875件原状土样的试验资料统计分析,对该区域软弱土的基本物理特性进行了系统分类统计;然后,运用GEOSLOPE、MIDAS等软件,采用极限平衡分析方法、有限元法对部分桥头路堤的稳定性、沉降规律进行了深入分析,为目前桥头路堤最为常用的两种地基处理方式(桩承式加筋路堤和泡沫混凝土轻质路堤)的设计参数提供了重要的定量依据,为工程实施做出了重要的技术指导,取得了较好的工程实效。 本文主要研究工作和创新点如下： 1、基于乐清湾港区大量原状软土土样的室内试验数据的统计分析,首次对乐清湾区域软土的物理力学性质指标的进行了统计计算,并得出了乐清湾区域各类软土主要物理力学参数统计特征值及其分布规律、主要物理力学参数之间的相关性,从而为乐清湾区域的工程建设提供了定量分析的基础； 2、通过对乐清湾港区疏港公路一低矮路堤开裂滑移机理进行了分析,计算出了不同反压护道高度、宽度工况组合下的路堤稳定系数,并首次提出了反压护道高度和宽度与路堤稳定性的关系； 3、运用GEOSLOPE、MIDAS等有限元软件开展了桥头路堤稳定分析与沉降控制技术研究,探讨了该区域路堤的安全系数与c、φ值之间的相关性； 4、对桩承式加筋路堤的优缺点进行了系统归纳,结合工程实例,对桩承式加筋路堤的稳定性和沉降特性进行了分析； 5、系统总结了滨海公路桥头路堤地基处理的常用方法、工艺特点,并重点对泡沫混凝土路堤的适用性、可行性及优势进行了分析； 6、基于极限平衡法,本文首次对泡沫混凝土桥头路堤的稳定性进行了分析；通过有限元建模,对滨海地区泡沫混凝土桥头路堤沉降规律进行了分析研究；通过对桥台台后路堤泡沫混凝土纵向填筑不同台阶宽度的过渡模式的对比分析,提出乐清湾滨海区域泡沫混凝土路堤的填筑高度约为6m时,泡沫混凝土桥头填筑的台阶宽度宜为：L≥6.0m。
[Abstract]:The effect of foundation treatment on the bridge head of coastal embankment is related to the quality of highway engineering and the safety of operation. It is one of the key technical guarantee for the driving comfort of high grade highway in the coastal deep soft soil area. This paper is based on the construction of open port highway in Yueqing Bay Port area. Firstly, 41 boreholes are drilled through the port area of Yueqing Bay. Based on the statistical analysis of 875 undisturbed soil samples, the basic physical characteristics of soft soil in this area are classified and analyzed systematically. Then, using GEOSLOPEPEMIDAS and other software, the limit equilibrium analysis method, finite element method is used to analyze the stability and settlement of part of the bridge embankment. It provides an important quantitative basis for the design parameters of the two most commonly used foundation treatment methods (pile-supported reinforced embankment and foam concrete lightweight embankment). It provides important technical guidance for engineering implementation and achieves good engineering results. The main research work and innovation of this paper are as follows: 1. Based on the statistical analysis of laboratory test data of a large number of undisturbed soft soil samples in Yueqing Bay, the physical and mechanical properties of soft soil in Yueqing Bay are calculated for the first time. The statistical characteristic values and distribution of main physical and mechanical parameters of various soft soil in Yueqing Bay area are obtained, as well as the correlation between the main physical and mechanical parameters. Thus it provides the basis of quantitative analysis for the engineering construction of Yueqing Bay area. 2. Through the analysis of the mechanism of cracking and sliding of a low embankment in Yueqing Bay Port area, the stability coefficient of embankment under different backpressure protection road height and width is calculated. The relationship between the height and width of backpressure retaining road and the stability of embankment is put forward for the first time. 3. The stability analysis and settlement control technology of bridgehead embankment are studied by using the finite element software GEOSLOPEPEMIDAS, and the safety factor and c of the embankment in this area are discussed. Correlation between 蠁 values; 4. The advantages and disadvantages of pile-supported reinforced embankment are systematically summarized, and the stability and settlement characteristics of pile-supported reinforced embankment are analyzed in combination with engineering examples. 5. The common methods and technical characteristics of foundation treatment for bridge head embankment of coastal highway are systematically summarized, and the applicability, feasibility and advantages of foamed concrete embankment are analyzed. 6. Based on the limit equilibrium method, the stability of foamed concrete bridgehead embankment is analyzed for the first time. The settlement law of foamed concrete bridgehead embankment in coastal area is analyzed by finite element modeling. Based on the comparison and analysis of the transition modes of foam concrete filled with foam concrete at the back of abutment, it is proposed that the filling height of foamed concrete embankment in the coastal area of Yueqing Bay is about 6 m. The step width of foamed concrete bridge tip should be 鈮，

本文编号：1470215