本文選題：黃土邊坡　切入點：數(shù)值模擬　出處：《長安大學》2015年碩士論文

【摘要】：黃土在我國分布面積廣,厚度大。黃土滑坡是我國分布很廣泛,破壞很嚴重的一種自然災害,對人民生命和財產(chǎn)安全造成了極大危害,因此研究黃土邊坡,在防災減災領域有著重要意義,數(shù)值模擬方法是研究黃土滑坡的較為有效的方法。本文在總結分析黃土邊坡類型、成因、破壞方式的基礎上,研究了黃土邊坡在地震作用下和水滲流作用下邊坡穩(wěn)定性的變化。獲取的主要認識如下:(1)總結了黃土邊坡的成因、類型、破壞形式等(2)概括了邊坡計算的基本模型如極限平衡法-簡化畢曉普法,強度折減法和非飽和滲流的物理模型等;(3)用ABQUS軟件分析了在地震作用下不同結構黃土邊坡的加速度、形變、應力等,總結出軟弱夾層傾角不同黃土邊坡對地震荷載的不同響應,得出規(guī)律性結論。結果表明隨著軟弱夾層傾角反傾到正傾,逐漸增加的過程中,邊坡對地震的響應也隨著增強;(4)用GeoStudio軟件分析在集中入滲,降雨入滲,庫水位突然下降等與水有關工況,黃土邊坡穩(wěn)定性的變化,總結出規(guī)律性結論。表明入滲點的位置不同,對邊坡穩(wěn)定性影響巨大。在考慮總降雨量一樣的情況下,降水時間越大邊坡穩(wěn)定性越差。庫水位突然下降的情況下,由于內(nèi)部孔隙水壓力還沒有來的及消散,而外界水壓力消失,造成穩(wěn)定性下降。
[Abstract]:Loess landslide is a kind of natural disaster which is widely distributed and seriously damaged in our country, which has caused great harm to people's life and property safety, so the loess slope is studied. In the field of disaster prevention and mitigation, numerical simulation method is an effective method to study loess landslide. The variation of slope stability under earthquake and water seepage is studied. The main knowledge obtained is as follows: 1) the causes and types of loess slope are summarized. The basic models of slope calculation, such as the limit equilibrium method, the simplified Bixiaopu method, the strength reduction method and the physical model of unsaturated seepage, are summarized. The acceleration of loess slope with different structures under earthquake action is analyzed by ABQUS software. Deformation, stress and so on, the different responses of loess slope with different dip angles of weak intercalation to earthquake load are summarized, and the regular conclusions are drawn. The results show that with the dip of weak intercalation tilting backwards to the positive inclination, the slope gradually increases. The response of slope to earthquake is also enhanced with the increase of earthquake. The GeoStudio software is used to analyze the variation of stability of loess slope under the conditions of concentrated infiltration, rainfall infiltration and sudden drop of reservoir water level. The results show that the location of infiltration point is different. The larger the precipitation time, the worse the slope stability. When the reservoir water level drops suddenly, because the internal pore water pressure has not come and dissipates, But the external water pressure disappears, causes the stability to drop.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU43

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本文編號：1657769