本文選題：含砂礫石成層邊坡　切入點(diǎn)：變形破壞機(jī)理　出處：《湖南科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國經(jīng)濟(jì)建設(shè)的高速發(fā)展,城市高層建筑越來越多,基坑開挖也朝深大方向發(fā)展,基坑開挖過程中,成層土夾層狀砂礫石的情況較常見,設(shè)計(jì)時(shí)常將其視為均質(zhì)邊坡進(jìn)行穩(wěn)定性分析,計(jì)算結(jié)果與實(shí)際差別較大。因此,對超載作用下含砂礫石成層邊坡破壞機(jī)理及穩(wěn)定性進(jìn)行研究具有一定的現(xiàn)實(shí)意義。在熟悉邊坡穩(wěn)定性理論及方法的基礎(chǔ)上,通過設(shè)計(jì)室內(nèi)模型試驗(yàn)、數(shù)值模擬、理論分析相結(jié)合的方法對超載作用下含砂礫石成層邊坡的變形破壞機(jī)理、工作性狀及穩(wěn)定性進(jìn)行研究。相關(guān)研究成果如下:1、通過室內(nèi)模型試驗(yàn)得出含砂礫石成層邊坡在坡頂超載作用下的位移變化規(guī)律,對照各類工況發(fā)現(xiàn)含砂礫石成層邊坡在失穩(wěn)破壞時(shí)均為局部剪切破壞,滑動面為圓弧+直線型。2、采用FLAC對室內(nèi)試驗(yàn)各工況進(jìn)行數(shù)值模擬,結(jié)果表明各類工況下的模型破壞機(jī)理與室內(nèi)模型試驗(yàn)吻合,滑動面為圓弧+直線型。并通過多種工況計(jì)算,分析了超載作用下含砂礫石成層邊坡的極限承載能力和位移隨不同砂礫石層厚度、不同砂礫石層位置、不同坡比、加載面積的差異等因素下的變化規(guī)律。對承載力影響較大的因素有:砂礫石層厚度、砂礫石層位置,坡比。3、建立超載作用下含砂礫石成層邊坡的滑動面模式的運(yùn)動容許速度場,采用極限分析上限法求出了其極限承載力的計(jì)算公式,并將其與室內(nèi)試驗(yàn)結(jié)果和數(shù)值模擬結(jié)果進(jìn)行相互對比,得出上限法在求解超載作用下含砂礫石成層邊坡的極限承載力時(shí)與室內(nèi)試驗(yàn)的差值在10.42%左右,具有一定的工程實(shí)用價(jià)值。
[Abstract]:With the rapid development of economic construction in our country, more and more high-rise buildings are built in cities, and the excavation of foundation pit also develops in the direction of deep. During the excavation of foundation pit, the situation of layered soil intercalated sand and gravel is more common. The design often regards it as a homogeneous slope for stability analysis, and the result of calculation is quite different from that of practice. It is of practical significance to study the failure mechanism and stability of the slope with sand and gravel layers under overload. On the basis of familiar with the theory and method of slope stability, the numerical simulation is carried out through the model test in the design room. The mechanism of deformation and failure of sandy gravel stratified slope under the action of overload is analyzed by the method of theoretical analysis. The related research results are as follows: 1. Through the indoor model test, the displacement variation law of the slope with sand and gravel layers under the action of overloading on the top of the slope is obtained. Compared with all kinds of working conditions, it is found that the slope with sand and gravel layers is local shear failure when it is unstable, and the sliding surface is circular arc linear type. FLAC is used to simulate each working condition of indoor test. The results show that the failure mechanism of the model under various working conditions is consistent with that of the indoor model test, and the sliding surface is a circular arc straight line. The ultimate bearing capacity and displacement of the gravel-bearing slope under the action of overload are analyzed with different thickness of gravel layer, different location of gravel layer and different slope ratio. The influence factors on the bearing capacity are: the thickness of gravel layer, the location of gravel layer, the slope ratio. The allowable velocity field of the sliding surface model of the slope with sand gravel layer under overload action is established. The calculation formula of ultimate bearing capacity is obtained by using the upper limit method of limit analysis, and the results of indoor test and numerical simulation are compared with each other. It is concluded that the difference between the upper limit method and laboratory test is about 10.42% when the ultimate bearing capacity of sandy gravel layered slope is calculated under the action of overload, which has certain engineering practical value.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TU43

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本文編號：1576765