高速远程滑坡—碎屑流及其涌浪数值模拟分析

发布时间：2018-08-16 08:26

【摘要】：近年来,具有高位、远程、高速特点的高山峡谷区滑坡灾害发生频繁。在滑坡发生的过程中,滑体高速碰撞解体后沿沟谷形成碎屑流。当滑坡-碎屑流前方存在水体时,滑体高速入水,激起涌浪。本文以鸡冠岭滑坡-碎屑流、福泉小坝滑坡为典型实例,通过滑坡动力分析软件DAN-W反演滑坡入水前运动过程;在DAN-W模拟结果的基础上,采用FLUENT软件建立滑体开始入水后涌浪数值模型,对滑坡产生涌浪及其传播过程进行研究,主要工作和成果有:1.以鸡冠岭滑坡-碎屑流、福泉小坝滑坡这两个高速远程滑坡实例为基础背景,建立DAN-W理想模型,模拟滑坡入水前滑体形态、速度分布及堆积体分布等特征。为FLUENT模拟涌浪提供了入水速度及滑体形态的参考数值。2.利用FLUENT软件,选取Heinrich物理试验进行二维物理模型验证。数值模拟结果与模型试验较好吻合,表明FLUENT软件能够精确模拟滑块沿斜坡入水所产生涌浪及其传播过程,为模拟滑坡实例的涌浪灾害提供了可能。3.简述鸡冠岭滑坡-碎屑流、福泉小坝滑坡的工程地质条件、滑坡运动特征及堆积体分布。在DAN-W计算结果的基础上,利用FLUENT软件分别建立鸡冠岭滑坡-碎屑流、福泉小坝滑坡入水后产生涌浪的二维数值模型,将滑体等效为流体,进行滑坡涌浪过程模拟分析。4.基于FLUENT软件对Liu物理模型试验进行三维数值模拟,数值模拟结果与试验监测值可较好吻合。模拟结果表明:在横轴方向上,涌浪传播形成正负波;在径向方向上,涌浪在中心线附近的水面发生明显波动,水面沿中心线对称变化。
[Abstract]:In recent years, landslide disasters occurred frequently in high, long-range and high-speed mountain canyons. In the process of landslide, debris flow is formed along the gully after the high-speed collision and disintegration of the sliding body. When there is water in front of the landslide-debris flow, the sliding body enters the water at high speed and arouses waves. This paper takes Jiguanling landslide-debris flow and Fuquan Xiaoba landslide as a typical example, and inverts the movement process of landslide before entering water through landslide dynamic analysis software DAN-W, based on the results of DAN-W simulation. The numerical model of surge wave after the sliding body began to enter the water is established by using FLUENT software. The main work and results are as follows: 1: 1. The main work and results are as follows: 1. The process of landslide surge and its propagation are studied. Based on the examples of Jiguanling landslide-clastic flow and Fuquan Xiaoba landslide, an ideal DAN-W model is established to simulate the shape, velocity distribution and accumulative body distribution of the landslide before it enters the water. It provides a reference value of inflow velocity and sliding body shape for FLUENT simulation of surge wave. Using FLUENT software, Heinrich physical experiment is selected to verify the two-dimensional physical model. The numerical simulation results are in good agreement with the model test, which indicates that the FLUENT software can accurately simulate the surge and its propagation process caused by the sliding block entering the slope, which provides the possibility of simulating the surge disaster of the landslide example. This paper briefly describes the engineering geological conditions of Jiguanling landslide, debris flow, Fuquan Xiaoba landslide, landslide movement characteristics and accumulation body distribution. Based on the results of DAN-W calculation, the two-dimensional numerical model of surge wave was established by using FLUENT software to simulate the process of landslide surge in Jiguanling landslide and Fuquan Xiaoba landslide after entering water. The sliding body was equivalent to fluid, and the simulation analysis of landslide surge process was carried out. Three-dimensional numerical simulation of Liu physical model test based on FLUENT software shows that the numerical simulation results are in good agreement with the experimental results. The simulation results show that the inrush wave propagates positive and negative waves in the transverse axis direction, and in the radial direction, obvious waves fluctuate in the water surface near the center line, and the water surface changes symmetrically along the center line.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P642.22

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