發(fā)布時間：2019-01-17 09:33

【摘要】：井筒式地下連續(xù)墻基礎(chǔ)具有承載能力強(qiáng)、抗橫向荷載能力強(qiáng)、施工方便等諸多優(yōu)點,作為一種新型的橋梁基礎(chǔ)形式,隨著各項試驗和模擬研究的開展,其相對于其他基礎(chǔ)形式的優(yōu)勢及良好的經(jīng)濟(jì)效益也日漸顯現(xiàn)。本文利用數(shù)值模擬的方法對井筒式地下連續(xù)墻橋梁基礎(chǔ)靜力荷載下的承載性狀以及地震荷載下抵抗地基液化的能力進(jìn)行了探究。主要內(nèi)容和結(jié)論如下： (1)論述了地下連續(xù)墻的發(fā)展、分類和其在橋梁基礎(chǔ)中的應(yīng)用狀況,并總結(jié)了關(guān)于地基液化的研究歷程。 (2)利用FLAC3D軟件對井筒式地連墻基礎(chǔ)進(jìn)行了靜力承載性能分析,并著重對其縱向荷載下承載性狀進(jìn)行了研究。 (3)探究了土體物理力學(xué)性質(zhì)：粘聚力、內(nèi)摩擦角、剪切模量、密度和體積模量等對井筒地連墻基礎(chǔ)的承載性能的影響程度。結(jié)果表明：土質(zhì)越好,墻體的承載力越大,而墻體增大到一定尺寸(墻深達(dá)26m或墻寬達(dá)7m)后,繼續(xù)增大尺寸并不能增強(qiáng)其承載能力。 (4)首次用FLAC3D對井筒式地下連續(xù)墻基礎(chǔ)在地震荷載作用下的動力響應(yīng)進(jìn)行了模擬分析。得出結(jié)論,井筒式地下連續(xù)墻基礎(chǔ)對土芯土有一定的保護(hù)作用,能夠阻斷砂土的液化趨勢；基礎(chǔ)墻體的橫向剛度,能夠滿足抵抗地震橫向作用的要求。
[Abstract]:As a new type of bridge foundation, the underground continuous wall foundation of wellbore type has many advantages, such as strong bearing capacity, strong lateral load resistance, easy construction and so on. Its relative to other basic forms of advantage and good economic benefits are also increasingly apparent. In this paper, the bearing behavior of underground diaphragm wall bridge foundation under static load and the ability to resist foundation liquefaction under seismic load are investigated by numerical simulation. The main contents and conclusions are as follows: (1) the development, classification and application of underground continuous wall in bridge foundation are discussed, and the research history of foundation liquefaction is summarized. (2) using FLAC3D software, the static load-bearing behavior of shaft wall foundation is analyzed, and the load-bearing behavior under longitudinal load is studied emphatically. (3) the physical and mechanical properties of soil, such as cohesive force, angle of internal friction, shear modulus, density and volume modulus, are studied. The results show that the better the soil quality, the greater the bearing capacity of the wall, and when the wall increases to a certain size (the depth of the wall reaches 26m or the width of the wall reaches 7m), the bearing capacity of the wall can not be enhanced by increasing its size. (4) for the first time, FLAC3D is used to simulate the dynamic response of underground diaphragm wall foundation under seismic load. It is concluded that the foundation of borehole diaphragm wall can protect the soil core and soil to some extent, and can block the liquefaction trend of sand, and the lateral stiffness of the foundation wall can meet the requirement of resisting the lateral action of earthquake.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.55

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