【摘要】：三峽工程是迄今為止最大的水利工程,對(duì)庫(kù)區(qū)滑坡災(zāi)害的監(jiān)測(cè)和機(jī)制研究一直是重要的研究課題。本文利用Terra SAR-X的強(qiáng)度圖進(jìn)行相關(guān)計(jì)算,求解出2009年5月20日至8月5日期間三峽樹(shù)坪滑坡的形變場(chǎng)。該形變場(chǎng)特征和樹(shù)坪滑坡體的地形特征吻合甚好,位移大小、方向和三峽大學(xué)對(duì)滑坡體的野外觀測(cè)結(jié)果基本吻合。以此高精度位移場(chǎng)為外部約束,結(jié)合野外觀測(cè)資料對(duì)滑坡體介質(zhì)力學(xué)性質(zhì)進(jìn)行分類并選取邊界條件,利用有限元方法對(duì)滑坡活動(dòng)進(jìn)行動(dòng)力學(xué)計(jì)算模擬。計(jì)算過(guò)程中對(duì)滑坡體的滑動(dòng)面形狀、因降雨引起材料參數(shù)變化和三峽水庫(kù)水位等因素分別反演和調(diào)整,得出符合其變形和發(fā)展過(guò)程的滑坡動(dòng)力學(xué)特征。發(fā)現(xiàn)軟弱帶的物性參數(shù)決定滑坡體總體滑動(dòng)量,滑坡體的物性參數(shù)決定位移分布的峰值位置。在確定了滑坡動(dòng)力學(xué)特征之后,進(jìn)一步討論降雨和庫(kù)區(qū)水位下降對(duì)滑坡產(chǎn)生的貢獻(xiàn)權(quán)重,得出降雨是樹(shù)坪滑坡的決定因素。
[Abstract]:The three Gorges Project (TGP) is the largest water conservancy project so far, the monitoring and mechanism study of landslide disaster in the reservoir area has been an important research topic. In this paper, the deformation field of Shuping landslide in three Gorges from May 20 to August 5, 2009 is calculated by using the intensity diagram of Terra SAR-X. The characteristics of the deformation field are in good agreement with the topographic characteristics of the Shuping landslide, and the displacement and direction are basically consistent with the field observation results of the three Gorges University. Taking the high precision displacement field as the external constraint and combining the field observation data to classify the mechanical properties of the landslide medium and select the boundary conditions, the dynamic calculation and simulation of the landslide activity are carried out by using the finite element method. In the course of calculation, the shape of sliding surface of landslide body is inversed and adjusted respectively because of the variation of material parameters caused by rainfall and the water level of three Gorges Reservoir, and the dynamic characteristics of landslide in accordance with its deformation and development process are obtained. It is found that the physical parameters of the weak zone determine the total slip of the landslide, and the physical parameters of the landslide determine the peak position of the displacement distribution. After determining the dynamic characteristics of landslide, the contribution weight of rainfall and water level drop in reservoir area to landslide is discussed further, and it is concluded that rainfall is the decisive factor of Shuping landslide.
【作者單位】： 北京大學(xué)地球物理學(xué)系;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(40874043、41274094、40872133)資助
【分類號(hào)】：P642.22

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