堰塞体形成全过程的连续离散耦合数值模拟
发布时间：2019-03-11 19:15
【摘要】：地震是触发边坡失稳、滑动形成堰塞湖的重要因素,以云南鲁甸"8·03"地震引发红石岩滑坡为例,应用连续-离散耦合分析方法(FDEM),模拟了三维滑坡体从变形破坏至堆积形成堰塞体的全过程。采用双轴压缩数值试验率定各岩土层的FDEM模拟参数,以对应实际岩土体物理力学参数。建立了滑坡体和河谷的三维有限元模型,滑坡体部分采用较小的网格密度,并在实体有限单元之间插入无厚度界面单元模拟。随着滑坡体的失稳和滑动,失效界面单元不断增加,导致滑坡体由连续体向非连续体转换,并最终形成松散的堆积体。三维FDEM数值模拟表明,地震引发边坡岩体内部损伤和变形累积,结构面贯通,滑坡体高速下滑并伴随破坏、解体、撞击对岸、堆积河道、不断密实,形成堰塞体。最终形成的堆积体形态与现场情况比较接近。
[Abstract]:Earthquake is an important factor to trigger slope instability and slide to form barrier lake. Taking the red rock landslide caused by "8 路03" earthquake in Ludian, Yunnan Province as an example, the continuous-discrete coupling analysis method (FDEM),) is applied. The whole process of three-dimensional landslide body from deformation failure to accumulation to form barrier body is simulated. The FDEM simulation parameters of each rock and soil layer are determined by using the biaxial compression numerical test rate to correspond to the physical and mechanical parameters of the actual rock and soil mass. A three-dimensional finite element model of the landslide body and valley is established. The landslide body is simulated with a small mesh density and a thickness-free interface element is inserted between the solid finite elements. With the instability and sliding of the landslide, the failure interface element increases constantly, which results in the transition from continuum to discontinuity, and finally forms loose accumulations. The three-dimensional FDEM numerical simulation shows that the damage and deformation accumulated in the slope rock mass caused by the earthquake, the structure plane is connected, the landslide body declines at high speed and accompanied with the destruction, disintegrates, impacts the opposite bank, accumulates the river channel, and compacts continuously, forming the dammed body. The final formation of the accumulation body shape is close to the field situation.
【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;武汉大学水工岩石力学教育部重点实验室;
【基金】：国家自然科学基金面上项目(51379161) 中国博士后科学基金面上资助(2016T907272)
【分类号】：P642.2
，
本文编号：2438545
[Abstract]:Earthquake is an important factor to trigger slope instability and slide to form barrier lake. Taking the red rock landslide caused by "8 路03" earthquake in Ludian, Yunnan Province as an example, the continuous-discrete coupling analysis method (FDEM),) is applied. The whole process of three-dimensional landslide body from deformation failure to accumulation to form barrier body is simulated. The FDEM simulation parameters of each rock and soil layer are determined by using the biaxial compression numerical test rate to correspond to the physical and mechanical parameters of the actual rock and soil mass. A three-dimensional finite element model of the landslide body and valley is established. The landslide body is simulated with a small mesh density and a thickness-free interface element is inserted between the solid finite elements. With the instability and sliding of the landslide, the failure interface element increases constantly, which results in the transition from continuum to discontinuity, and finally forms loose accumulations. The three-dimensional FDEM numerical simulation shows that the damage and deformation accumulated in the slope rock mass caused by the earthquake, the structure plane is connected, the landslide body declines at high speed and accompanied with the destruction, disintegrates, impacts the opposite bank, accumulates the river channel, and compacts continuously, forming the dammed body. The final formation of the accumulation body shape is close to the field situation.
【作者单位】： 武汉大学水资源与水电工程科学国家重点实验室;武汉大学水工岩石力学教育部重点实验室;
【基金】：国家自然科学基金面上项目(51379161) 中国博士后科学基金面上资助(2016T907272)
【分类号】：P642.2
，
本文编号：2438545
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