本文選題：震裂邊坡 + 降雨��； 參考：《江蘇科技大學》2015年碩士論文

【摘要】：地震和降雨都是引起邊坡失穩(wěn)的重要誘導因素,地震不僅能引發(fā)山體滑坡等直接災害,還能使大量山體出現(xiàn)開裂松動,形成具有潛在災害的震裂邊坡,而降雨入滲使得邊坡土體內(nèi)的孔隙含水量增大,地下水潛水面升高,從而導致滑面處土體軟化,進一步產(chǎn)生滑坡災害,對于一些地震災區(qū),同樣也屬于降雨較為充分的地區(qū),大量的地震震裂邊坡在降雨的作用下穩(wěn)定性如何變化是防災減災的重要課題。本文根據(jù)大量的地震震裂邊坡的發(fā)生資料,歸納出震裂邊坡的發(fā)展規(guī)律,初步分析了地震震裂邊坡的破壞機制,并在飽和—非飽和土滲流及非飽和土強度理論的基礎上,運用Abaqus有限元軟件對地震震裂邊坡降雨入滲過程進行模擬,并得出其穩(wěn)定性變化規(guī)律。本文的主要內(nèi)容如下:1.整理古浪8.0級地震、汶川8.0級地震和玉樹7.1級地震三次典型大地震地震災區(qū)震裂邊坡的詳細調(diào)查資料,歸納和總結(jié)了地震震裂邊坡的發(fā)生、發(fā)展及其分布的特點和規(guī)律。2.基于邊坡特性的影響效應分析和地震波對邊坡的作用效應理論,采用示意圖的方式直觀地分析了地震震裂邊坡的破壞機制。3.基于飽和—非飽和土滲流理論,利用Abaqus有限元軟件對震裂邊坡的降雨過程進行了數(shù)值模擬,分析了降雨過程中震裂邊坡(特別是地震裂縫附近特征點)的孔隙水壓力、飽和度、位移和等效塑性應變的變化情況,從而評價降雨過程中地震裂縫對邊坡滲流產(chǎn)生的影響。4.基于前文統(tǒng)計分析的震裂邊坡發(fā)展特征,設計不同的數(shù)值模擬工況,在非飽和土強度理論的基礎上,利用強度折減法對不同裂縫位置、裂縫深度、降雨強度、降雨持時和土體滲透系數(shù)下震裂邊坡降雨穩(wěn)定性進行研究,分析出不同影響因素對震裂邊坡穩(wěn)定性的影響規(guī)律。
[Abstract]:Earthquake and rainfall are important inductive factors of slope instability. Earthquake can not only cause landslide and other direct disasters, but also cause cracking and loosening of a large number of mountain bodies, forming a cracked slope with potential disasters. Rainfall infiltration increases the pore water content in the slope soil and the groundwater diving surface, which results in the softening of soil on the slip surface and further landslide disaster. For some earthquake-stricken areas, they also belong to the areas with relatively adequate rainfall. How to change the stability of a large number of seismic cracked slopes under the action of rainfall is an important subject of disaster prevention and mitigation. Based on a great deal of data of earthquake crack slope, this paper sums up the development law of earthquake crack slope, analyzes the failure mechanism of earthquake crack slope, and based on the theory of saturated-unsaturated soil seepage and unsaturated soil strength, The process of rainfall infiltration of seismic crack slope is simulated by Abaqus finite element software, and its stability variation law is obtained. The main contents of this paper are as follows: 1. In this paper, the detailed investigation data of earthquake crack slope in three typical earthquake areas of Gulang earthquake (M = 8.0), Wenchuan earthquake (M = 8.0) and Yushu earthquake (M = 7.1) are reviewed, and the occurrence, development and distribution characteristics and regularity of seismic crack slope are summarized and summarized. Based on the analysis of the influence effect of slope characteristics and the theory of the effect of seismic wave on the slope, the failure mechanism of seismic cracked slope is analyzed intuitively by means of schematics. Based on the theory of saturated-unsaturated soil seepage, the rainfall process of the cracked slope is simulated by using Abaqus finite element software. The pore water pressure and saturation of the cracked slope (especially the characteristic points near the seismic fracture) during the rainfall process are analyzed. The variation of displacement and equivalent plastic strain, so as to evaluate the influence of seismic cracks on the seepage of slope during rainfall. Based on the statistical analysis of the characteristics of seismic crack slope development, different numerical simulation conditions are designed. On the basis of the strength theory of unsaturated soil, the strength reduction method is used to analyze the different crack positions, crack depth, rainfall intensity. The rainfall stability of cracked slope was studied under rainfall duration and soil permeability coefficient, and the influence of different factors on the stability of cracked slope was analyzed.
【學位授予單位】：江蘇科技大學
【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：1925408