三峡树坪滑坡动力学的有限元模拟
发布时间：2018-11-04 08:17
【摘要】：三峡工程是迄今为止最大的水利工程,对库区滑坡灾害的监测和机制研究一直是重要的研究课题。本文利用Terra SAR-X的强度图进行相关计算,求解出2009年5月20日至8月5日期间三峡树坪滑坡的形变场。该形变场特征和树坪滑坡体的地形特征吻合甚好,位移大小、方向和三峡大学对滑坡体的野外观测结果基本吻合。以此高精度位移场为外部约束,结合野外观测资料对滑坡体介质力学性质进行分类并选取边界条件,利用有限元方法对滑坡活动进行动力学计算模拟。计算过程中对滑坡体的滑动面形状、因降雨引起材料参数变化和三峡水库水位等因素分别反演和调整,得出符合其变形和发展过程的滑坡动力学特征。发现软弱带的物性参数决定滑坡体总体滑动量,滑坡体的物性参数决定位移分布的峰值位置。在确定了滑坡动力学特征之后,进一步讨论降雨和库区水位下降对滑坡产生的贡献权重,得出降雨是树坪滑坡的决定因素。
[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.
【作者单位】： 北京大学地球物理学系;
【基金】：国家自然科学基金项目(40874043、41274094、40872133)资助
【分类号】：P642.22
本文编号：2309262
[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.
【作者单位】： 北京大学地球物理学系;
【基金】：国家自然科学基金项目(40874043、41274094、40872133)资助
【分类号】：P642.22
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