拉西瓦水电站果卜岸坡滑坡涌浪数值模拟研究

发布时间：2018-06-10 15:55

本文选题：果卜岸坡 + 滑坡涌浪　；参考：《西安理工大学》2017年硕士论文

【摘要】：我国是一个地质灾害分布广泛、灾害频发、灾害类型复杂的国家,其中滑坡灾害是所有地质灾害中分布最广、危害最严重的一种。尤其是高速滑坡失稳,滑速高,来势猛,在水体中传播后,对过往船只、两岸居民及工程建筑物带来惨重的,甚至毁灭性的灾害。为了研究岸坡失稳体下滑造成的涌浪运动,传播过程的规律及涌浪特性,可能产生的库区涌浪高度,防止潜在失稳及其产生的涌浪危害到电站下部建筑物,选题针对拉西瓦水电站果卜岸坡的地质环境和水库特征,通过数值模拟计算,基于RNGk-ε模型、VOF方法追踪自由表面,对比物理模型试验,并结合经验公式法进行计算。本文主要研究了拉西瓦水电站蓄水状态下变形体滑坡造成的涌浪特征、初始涌浪高度、对岸爬高、传播和衰减规律,主要有以下研究成果:(1)物理模型反复试验了库区水位在190m和202m时的岸坡崩塌涌浪,滑体入水速度为13.001m/s～23.66m/s,对岸最大涌浪高度为22m～47m,28～88m。(2)数值模拟计算了滑坡运动及涌浪形成过程。从滑坡体入水点开始,由于滑坡体的入水,水体呈现出冲溅、前涌、后溃三种基本形态,涌浪的整体传播过程分为:涌浪的形成区域、传播区域、衰减区域,数据表明在滑坡入水区域的上下游附近涌浪衰减最快,距离扰动点越远衰减越慢。(3)揭示了滑坡涌浪的浪高特性。滑坡体入水速度增大,涌浪的首浪波高随之增大,相对应的次浪波高也增大。滑坡体在同一入水角度时,当库区水深不变,首浪高度随着入水速度的增大而增大;当滑坡体高度不变,首浪高度随着水深增大而增大。(4)滑坡涌浪在对岸产生爬高,同一库区水位下,对岸爬坡高度随着滑坡体高度增大而增大;同一入水速度下,对岸爬坡高度随着水深增大而增大。滑块体入水产生的涌浪在上下游l00m范围内衰减最快,此后保持缓慢衰减,当传播至下游600m保持为稳定值。将试验数据与数值模拟对比,误差在5%以内。本文建立的数值模型可以再现物理试验中滑坡体产生的涌浪波浪的追逐、叠加、反射等相互作用的全过程。
[Abstract]:China is a country with a wide distribution of geological hazards, frequent disasters and complex types of disasters, among which landslide disaster is the most widely distributed and most serious one of all geological disasters. Especially, the high speed landslide is unstable, the speed of slide is high, and the coming force is fierce. After spreading in the water body, it brings heavy and even devastating disasters to the passing ships, residents and engineering buildings on both sides of the strait. In order to study the surge motion caused by slope instability body, the law of propagation process and the characteristics of surge wave, the potential instability and the resulting surge wave will be prevented from harming the lower building of the power station, so as to prevent the potential instability and the resulting surge wave from harming the lower building of the power station. According to the geological environment and reservoir characteristics of Gob bank slope of Laxiwa Hydropower Station, the free surface is tracked based on RNGk- 蔚 model and VOF method through numerical simulation. The physical model test is compared with the empirical formula method. In this paper, the characteristics of inrush caused by deformable landslide under the condition of water storage in Lasiwa Hydropower Station, the initial surge height, the climbing on the opposite bank, the law of propagation and attenuation are studied. The main results are as follows: 1) the physical model has repeatedly tested the slope collapse surge at 190m and 202m water level in the reservoir area. The sliding velocity is 13.001 m / s / s 23.66 m / s, and the maximum surge height is 22 m ~ (47) m / m ~ (28) / 88 路m ~ (2) the landslide movement and surge formation process have been calculated by numerical simulation. Starting from the entry point of the landslide, because of the inflow of the landslide, the water body presents three basic forms: splash, forward surge, and backward collapse. The overall propagation process of the surge is divided into three parts: the forming region, the spreading area, the attenuation area, The data show that the inrush attenuation is the fastest near the upstream and downstream area of the landslide, and the farther away from the disturbance point, the slower the attenuation is. 3) the characteristics of the wave height of the landslide surge are revealed. With the increase of inflow velocity, the first wave height and the secondary wave height increase. At the same water entry angle, when the water depth in the reservoir area is constant, the height of the first wave increases with the increase of the inflow velocity, and the height of the first wave increases with the increase of the water depth when the height of the landslide body remains constant. Under the same water level, the climbing height of the opposite bank increases with the increase of the height of the landslide body, and the height of the opposite bank increases with the increase of the water depth at the same water entry speed. The surge produced by the slider body in water decreases fastest in the range of 10m upstream and downstream, and then slowly attenuates, and is stable when it propagates to 600m downstream. The error between the test data and the numerical simulation is less than 5%. The numerical model established in this paper can reproduce the whole process of the interaction of surge waves generated by landslide in physical experiments such as chasing superposition reflection and so on.
【学位授予单位】：西安理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV223;TV139.23

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