本文關(guān)鍵詞：交通荷載作用下濱海地區(qū)加固軟土路基變形穩(wěn)定性分析　出處：《青島理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 軟土地基 交通荷載 數(shù)值模擬 變形分析 穩(wěn)定性

【摘要】：隨著基本建設(shè)的發(fā)展，在軟土地區(qū)興建公路、堤壩、機(jī)場(chǎng)、碼頭等項(xiàng)目將會(huì)日益增多，對(duì)地基的穩(wěn)定性要求也在不斷提高。由于軟土具有高含水量、低密度、低強(qiáng)度、高壓縮性、低透水性和中等靈敏度的基本特點(diǎn)，交通荷載作用下軟土路基的變形穩(wěn)定性分析一直是工程界普遍關(guān)心的問(wèn)題，也是一個(gè)值得深入研究的課題。 本文首先介紹了我國(guó)常采用的軟土地基加固技術(shù)，研究了適合青島高新區(qū)軟土地基加固的最優(yōu)方案，并分析加固后地基的各項(xiàng)物理、力學(xué)指標(biāo)。然后介紹了交通荷載的特性和模擬實(shí)現(xiàn)問(wèn)題，并選擇采用半波正弦荷載模擬交通荷載。最后通過(guò)數(shù)值模擬，研究交通荷載作用下加固軟土地基的變形和穩(wěn)定性。 本文采用理論分析和數(shù)值模擬相結(jié)合的方法研究交通荷載作用下加固軟土地基的變形和穩(wěn)定性，并取得了以下研究成果： （1）分別采用移動(dòng)恒載和移動(dòng)簡(jiǎn)諧荷載模擬交通荷載作用，將研究的路基簡(jiǎn)化為三維模型，采用數(shù)值分析法研究路基在兩種荷載下的瞬態(tài)響應(yīng)，最終選擇采用移動(dòng)簡(jiǎn)諧荷載模擬交通荷載。 （2）應(yīng)用數(shù)值模擬分析路基在移動(dòng)簡(jiǎn)諧荷載作用下的動(dòng)力響應(yīng)，獲得了加固軟土路基在交通荷載作用下，，不同深度和寬度范圍內(nèi)的豎向位移、加速度和動(dòng)應(yīng)力變化規(guī)律。 （3）研究了不同行車荷載、不同行車速度、不同路基剛度下的豎向位移、加速度和動(dòng)應(yīng)力的變化規(guī)律。 本文采用的研究方法和成果可作為交通荷載作用下加固軟土路基變形穩(wěn)定性分析的依據(jù)和參考。
[Abstract]:With the development of capital construction, the construction of highway, dyke, airport, wharf and other projects in soft soil area will be increasing day by day, and the requirement of foundation stability will also be raised. Because soft soil has high water content and low density. The basic characteristics of low strength, high compressibility, low permeability and medium sensitivity. The analysis of deformation and stability of soft soil roadbed under traffic load is always concerned by the engineering field. It is also a subject worthy of further study. This paper first introduces the soft soil foundation reinforcement technology which is often used in our country, studies the optimum scheme of soft soil foundation reinforcement suitable for Qingdao High-tech Zone, and analyzes the physics of the strengthened foundation. Then the characteristics of traffic load and its realization are introduced, and the half-wave sinusoidal load is chosen to simulate traffic load. Finally, numerical simulation is carried out. The deformation and stability of soft soil foundation strengthened by traffic load are studied. In this paper, the deformation and stability of soft soil foundation under traffic load are studied by combining theoretical analysis and numerical simulation. The following research results are obtained: 1) the traffic load is simulated by moving dead load and moving harmonic load respectively. The subgrade is simplified as a three-dimensional model, and the transient response of roadbed under two loads is studied by numerical analysis. Finally, the moving harmonic load is used to simulate the traffic load. 2) using numerical simulation to analyze the dynamic response of roadbed under moving harmonic load, the vertical displacement in different depth and width of reinforced soft soil roadbed under traffic load is obtained. The change of acceleration and dynamic stress. The changes of vertical displacement, acceleration and dynamic stress under different driving loads, different driving speeds and different subgrade stiffness are studied. The research method and results used in this paper can be used as the basis and reference for the analysis of deformation stability of soft soil roadbed strengthened by traffic load.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U416.1

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