本文關(guān)鍵詞： 濱海路堤 橋頭過渡段 地基處理 軟土工程特性 泡沫混凝土 樁承式加筋路堤 沉降 穩(wěn)定 極限平衡法 有限元　出處：《浙江工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：濱海路堤橋頭過渡段地基處理成效事關(guān)公路工程質(zhì)量和運營安全,是濱海深厚軟土區(qū)域高等級公路行車舒適性的關(guān)鍵技術(shù)保障之一。本文研究立足于樂清灣港區(qū)疏港公路建設(shè),首先,通過對樂清灣港區(qū)41只鉆孔、875件原狀土樣的試驗資料統(tǒng)計分析,對該區(qū)域軟弱土的基本物理特性進行了系統(tǒng)分類統(tǒng)計;然后,運用GEOSLOPE、MIDAS等軟件,采用極限平衡分析方法、有限元法對部分橋頭路堤的穩(wěn)定性、沉降規(guī)律進行了深入分析,為目前橋頭路堤最為常用的兩種地基處理方式(樁承式加筋路堤和泡沫混凝土輕質(zhì)路堤)的設(shè)計參數(shù)提供了重要的定量依據(jù),為工程實施做出了重要的技術(shù)指導(dǎo),取得了較好的工程實效。 本文主要研究工作和創(chuàng)新點如下： 1、基于樂清灣港區(qū)大量原狀軟土土樣的室內(nèi)試驗數(shù)據(jù)的統(tǒng)計分析,首次對樂清灣區(qū)域軟土的物理力學(xué)性質(zhì)指標(biāo)的進行了統(tǒng)計計算,并得出了樂清灣區(qū)域各類軟土主要物理力學(xué)參數(shù)統(tǒng)計特征值及其分布規(guī)律、主要物理力學(xué)參數(shù)之間的相關(guān)性,從而為樂清灣區(qū)域的工程建設(shè)提供了定量分析的基礎(chǔ)； 2、通過對樂清灣港區(qū)疏港公路一低矮路堤開裂滑移機理進行了分析,計算出了不同反壓護道高度、寬度工況組合下的路堤穩(wěn)定系數(shù),并首次提出了反壓護道高度和寬度與路堤穩(wěn)定性的關(guān)系； 3、運用GEOSLOPE、MIDAS等有限元軟件開展了橋頭路堤穩(wěn)定分析與沉降控制技術(shù)研究,探討了該區(qū)域路堤的安全系數(shù)與c、φ值之間的相關(guān)性； 4、對樁承式加筋路堤的優(yōu)缺點進行了系統(tǒng)歸納,結(jié)合工程實例,對樁承式加筋路堤的穩(wěn)定性和沉降特性進行了分析； 5、系統(tǒng)總結(jié)了濱海公路橋頭路堤地基處理的常用方法、工藝特點,并重點對泡沫混凝土路堤的適用性、可行性及優(yōu)勢進行了分析； 6、基于極限平衡法,本文首次對泡沫混凝土橋頭路堤的穩(wěn)定性進行了分析；通過有限元建模,對濱海地區(qū)泡沫混凝土橋頭路堤沉降規(guī)律進行了分析研究；通過對橋臺臺后路堤泡沫混凝土縱向填筑不同臺階寬度的過渡模式的對比分析,提出樂清灣濱海區(qū)域泡沫混凝土路堤的填筑高度約為6m時,泡沫混凝土橋頭填筑的臺階寬度宜為：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，

本文編號：1470215