本文選題：雅安-康定高速公路　切入點：瀘定互通綜合體　出處：《成都理工大學(xué)》2015年碩士論文

【摘要】：瀘定互通綜合體是雅安至康定高速公路交通轉(zhuǎn)換服務(wù)設(shè)施重要組成部分,更是后期二郎山超特長隧道安全運營的重要保障之一;該互通綜合體及其配套棄渣場地,根據(jù)各方面綜合考慮,位置定于高山峽谷區(qū)且需要經(jīng)過兩條泥石流溝。泥石流溝的危險性評價對瀘定互通綜合體以及棄渣場選址的可行性有至關(guān)重要的作用。同時由于目前有大量公路、鐵路將要或正在山嶺重丘區(qū)建設(shè),場地利用受限且地災(zāi)發(fā)育的問題尖銳。由于開挖土石方量巨大和場地有限,棄土場的選址考慮利用現(xiàn)有泥石流溝。因此棄土場位置的選擇與泥石流溝的綜合利用也都是這些工程項目至關(guān)重要的關(guān)鍵問題。本論文在研究了雅安至康定高速公路設(shè)計過程中,根據(jù)現(xiàn)場自然地理情況及水文、地質(zhì)條件,分別分析治理前和治理后泥石流溝對瀘定互通綜合體及棄土大壩的危險性,并給出合理的工程設(shè)計建議。通過本文的研究,希望為今后類似地區(qū)公路建設(shè),綜合利用泥石流溝進行有關(guān)設(shè)計提供可行的思路。通過本文研究,取得了以下幾點成果:(1)通過選取地形地貌、地質(zhì)條件、物源條件、植被、氣候等泥石流形成的多種因子,采用對五里溝主溝及其支溝進行泥石流危險性評價。通過評判,五里溝主溝泥石流易發(fā)程度的量化分值為80分,該溝泥石流的易發(fā)程度為輕度易發(fā);五里溝支溝泥石流易發(fā)程度的量化分值為72分,該溝泥石流的易發(fā)程度為輕度易發(fā)。(2)通過野外調(diào)查、遙感影像判識等手段,對五里溝進行泥石流溝域分區(qū)和啟動條件進行分析。分析表明,五里溝及其支溝在有利的地形地貌、物源條件及極端降雨條件下,較易發(fā)生泥石流災(zāi)害。(3)結(jié)合五里溝現(xiàn)場調(diào)查資料,參考相關(guān)規(guī)范、經(jīng)驗參數(shù),計算得出五里溝泥石流主要特征值。五里溝最大泥石流峰值流量為237.599m3/s,泥石流體中大石塊沖擊力為2302.19k N,五里溝主溝泥石流最大爬高為2.024m。(4)運用類比法,參考相關(guān)設(shè)計規(guī)范,分析五里溝泥石流對橋墩的危險性。計算得出橋墩能承受的最大沖擊力為2636k N,大于泥石流體中大石塊沖擊力。但考慮泥石流夾帶的大量石塊會對橋墩進行多次的沖擊,短時間內(nèi)可能會對橋墩造成毀滅性的破壞。(5)通過建立棄土大壩的數(shù)值模型,考慮暴雨、地震及極端情況(暴雨+地震)工況等因素,運用flac3d軟件對棄土大壩進行數(shù)值分析和動力響應(yīng)分析。根據(jù)FLAC模擬計算,大壩在泥石流發(fā)生并伴隨地震工況下最不穩(wěn)定,易發(fā)生整體失穩(wěn),對瀘定互通及雅康高速公路存在很大危險。(6)通過分析治理后泥石流對大壩危險性,對比工程措施的有效性,對泥石流防治及高速公路的設(shè)計提出了進一步的設(shè)計建議。
[Abstract]:Luding Intercommunication complex is an important part of traffic conversion service facilities of Ya'an to Kangding Expressway, and is also one of the important guarantees for the safe operation of Erlangshan Super long Tunnel in the later period.According to the comprehensive consideration of all aspects, the location is located in the alpine canyon area and two debris flow gullies are needed.The risk assessment of debris flow gullies plays an important role in the feasibility of Luding interworking complex and site selection.At the same time, because there are a large number of highways, the railway is going to be or is being built in the mountainous and heavy hill area, so the utilization of the site is limited and the problems of the disaster development are acute.Because of the large amount of excavation and the limited site, the site of the dump site is considered to use the existing debris flow ditch.Therefore, the selection of disposal site and the comprehensive utilization of debris flow gullies are also the key problems of these projects.In this paper, during the design of Ya-Kangding Expressway, according to the natural geographical situation, hydrological and geological conditions, the risk of debris flow gully to Luding interworking complex and abandoned dam is analyzed respectively before and after treatment.Reasonable engineering design suggestions are also given.Through the research of this paper, the author hopes to provide feasible ideas for highway construction in similar areas in the future and comprehensive use of debris flow gullies for relevant design.Through the research of this paper, the following results are obtained: 1) through selecting various factors of debris flow formation, such as landform and geomorphology, geological condition, provenance condition, vegetation, climate and so on, the risk of debris flow in the main gully of Wuli gully and its branches is evaluated.According to the evaluation, the quantitative score of debris flow susceptibility in Wuli gully is 80 points, the vulnerability degree of debris flow in this ditch is mild, the quantitative score of debris flow vulnerability in Wuligou branch ditch is 72 points.The susceptibility degree of debris flow in the gully is mildly easy to occur. (2) by means of field investigation and remote sensing image recognition, the zoning and starting conditions of debris flow gully area in Wuli gully are analyzed.The analysis shows that the Wuligou and its branch gullies are prone to debris flow disasters under favorable topographical and geomorphological conditions, provenance conditions and extreme rainfall conditions.The main characteristic values of debris flow in Wuli gully were calculated.The maximum peak flow of debris flow in Wuli ditch is 237.599m3 / s, the impact force of large rock in debris flow body is 2302.19kN, and the maximum climbing height of debris flow in main ditch of Wuligou is 2.024m. 4) the hazard of debris flow in Wuligou to pier is analyzed by analogy method and referring to relevant design specifications.The maximum impact force of pier is 2636kN, which is larger than that of rock mass in debris flow.However, considering a large number of rocks contained in debris flows will impact the pier many times, and may cause devastating damage to the pier in a short time. (5) by establishing a numerical model of the abandoned dam, the rainstorm is considered.The seismic and extreme conditions (rainstorm earthquake) and other factors are used to analyze the dynamic response and numerical value of the abandoned dam by using flac3d software.According to the FLAC simulation calculation, the dam is the most unstable under the condition of debris flow and accompanied by earthquake, which is prone to overall instability. There is a great danger to Luding Intercommunication and Yakang Expressway by analyzing the risk of debris flow to the dam after treatment.Compared with the effectiveness of engineering measures, further design suggestions are put forward for debris flow prevention and highway design.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U418.56;P642.23

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