本文選題：果卜岸坡 + 滑坡涌浪�。� 參考：《西安理工大學》2017年碩士論文

【摘要】：我國是一個地質(zhì)災害分布廣泛、災害頻發(fā)、災害類型復雜的國家,其中滑坡災害是所有地質(zhì)災害中分布最廣、危害最嚴重的一種。尤其是高速滑坡失穩(wěn),滑速高,來勢猛,在水體中傳播后,對過往船只、兩岸居民及工程建筑物帶來慘重的,甚至毀滅性的災害。為了研究岸坡失穩(wěn)體下滑造成的涌浪運動,傳播過程的規(guī)律及涌浪特性,可能產(chǎn)生的庫區(qū)涌浪高度,防止?jié)撛谑Х�(wěn)及其產(chǎn)生的涌浪危害到電站下部建筑物,選題針對拉西瓦水電站果卜岸坡的地質(zhì)環(huán)境和水庫特征,通過數(shù)值模擬計算,基于RNGk-ε模型、VOF方法追蹤自由表面,對比物理模型試驗,并結合經(jīng)驗公式法進行計算。本文主要研究了拉西瓦水電站蓄水狀態(tài)下變形體滑坡造成的涌浪特征、初始涌浪高度、對岸爬高、傳播和衰減規(guī)律,主要有以下研究成果:(1)物理模型反復試驗了庫區(qū)水位在190m和202m時的岸坡崩塌涌浪,滑體入水速度為13.001m/s～23.66m/s,對岸最大涌浪高度為22m～47m,28～88m。(2)數(shù)值模擬計算了滑坡運動及涌浪形成過程。從滑坡體入水點開始,由于滑坡體的入水,水體呈現(xiàn)出沖濺、前涌、后潰三種基本形態(tài),涌浪的整體傳播過程分為:涌浪的形成區(qū)域、傳播區(qū)域、衰減區(qū)域,數(shù)據(jù)表明在滑坡入水區(qū)域的上下游附近涌浪衰減最快,距離擾動點越遠衰減越慢。(3)揭示了滑坡涌浪的浪高特性。滑坡體入水速度增大,涌浪的首浪波高隨之增大,相對應的次浪波高也增大�；麦w在同一入水角度時,當庫區(qū)水深不變,首浪高度隨著入水速度的增大而增大;當滑坡體高度不變,首浪高度隨著水深增大而增大。(4)滑坡涌浪在對岸產(chǎn)生爬高,同一庫區(qū)水位下,對岸爬坡高度隨著滑坡體高度增大而增大;同一入水速度下,對岸爬坡高度隨著水深增大而增大。滑塊體入水產(chǎn)生的涌浪在上下游l00m范圍內(nèi)衰減最快,此后保持緩慢衰減,當傳播至下游600m保持為穩(wěn)定值。將試驗數(shù)據(jù)與數(shù)值模擬對比,誤差在5%以內(nèi)。本文建立的數(shù)值模型可以再現(xiàn)物理試驗中滑坡體產(chǎn)生的涌浪波浪的追逐、疊加、反射等相互作用的全過程。
[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.
【學位授予單位】：西安理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TV223;TV139.23

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