本文關(guān)鍵詞： 超高填方 邊坡 持續(xù)強降雨 穩(wěn)定性　出處：《重慶大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：在典型山區(qū)河谷地帶等地形復(fù)雜地區(qū)開展城鎮(zhèn)基礎(chǔ)設(shè)施建設(shè)通常相當(dāng)困難，具有可用地資源極為緊缺與缺少適合大規(guī)模工程建設(shè)的自然“開闊平地”的突出矛盾，這意味著在這類山地城市建設(shè)中進(jìn)行開山填溝造地的人工高填方工程將成為解決建設(shè)用地的重要途徑之一，超高填方體的穩(wěn)定性便成了影響工程安全穩(wěn)定運營的關(guān)鍵。在影響超高填方體穩(wěn)定性的眾多因素中，降水入滲是誘發(fā)填方邊坡失穩(wěn)破壞的主要因素，尤其是持續(xù)強降雨對邊坡的穩(wěn)定性的威脅更不容忽視，研究降雨入滲對超高填方邊坡穩(wěn)定性的影響機理和變形破壞過程對于填方體排水設(shè)計、施工等具有重要的參考價值。鑒于此，本文以重慶市某機場擴建工程的超高填方體為依托，開展持續(xù)降雨對超高填方體邊坡穩(wěn)定性影響的研究。 本文通過收集資料、野外地質(zhì)調(diào)查等手段，查明場區(qū)的工程地質(zhì)及水文地質(zhì)環(huán)境條件，掌握了基巖邊坡的結(jié)構(gòu)類型以及填方體堆載變形破壞模式；通過施工前現(xiàn)場調(diào)研，從總體上掌握場區(qū)地形、地質(zhì)及基巖邊坡穩(wěn)定性狀況；在對場區(qū)地質(zhì)條件、施工設(shè)計方案、現(xiàn)場試驗、高填方變形、沉降監(jiān)測及相關(guān)檢測成果分析的基礎(chǔ)上，結(jié)合工程地質(zhì)和數(shù)值反饋仿真研究，明確施工區(qū)高填方體的穩(wěn)定性狀況，并為其施工設(shè)計方案提供參考；通過場地水文地質(zhì)調(diào)研和現(xiàn)場地下水及孔隙水壓力監(jiān)測分析，結(jié)合現(xiàn)場滲透試驗研究，闡明降雨入滲對超高填方體坡體穩(wěn)定性的影響，，為機場施工過程中高填方出現(xiàn)的穩(wěn)定性及加固設(shè)計提供參考。本文主要研究工作和成果如下： ①運用極限平衡原理，采用巖土計算軟件Geostudio中的穩(wěn)定性計算模塊，計算在不同施工過程超高填方體邊坡的穩(wěn)定性系數(shù)。 ②運用有限差分法，采用FLAC3D計算軟件討論了復(fù)雜山體模型的建立過程和方法。 ③對高填方邊坡變形和穩(wěn)定性進(jìn)行更加全面深入的分析，從機理、內(nèi)部成因等闡述了導(dǎo)致此類變形破壞現(xiàn)象的原因。 ④通過FLAC3D數(shù)值模擬對超高填方邊坡穩(wěn)定性分析可知：在復(fù)雜地基基巖條件下，原地基形態(tài)、地基剛度及其填方體高度對高填方體邊坡的變形存在一定的影響，其變形模式主要以豎向變形為主，并伴隨一定量向坡外的位移。 ⑤在研究區(qū)內(nèi)選取典型剖面模擬持續(xù)降雨條件下的超高填方邊坡穩(wěn)定性，得出其邊坡穩(wěn)定性系數(shù)隨降雨持時的變化曲線，并得出在持續(xù)降雨24～36h是對邊坡穩(wěn)定性影響最大的時間段，并據(jù)此采取相關(guān)措施保證邊坡的穩(wěn)定性。 ⑥在研究區(qū)內(nèi)選取典型剖面研究具體施工過程中的邊坡穩(wěn)定性，從沉降等值線圖中可以發(fā)現(xiàn)最大沉降并不是發(fā)生在填筑最上層，而是發(fā)生在填筑體中間層，從剪應(yīng)變增量等值線圖中可以發(fā)現(xiàn)剪應(yīng)變增量最大的位置大都集中在基巖與填方體交界處，因此基巖的基覆界面是不易忽視的滑坡位置。
[Abstract]:It is usually very difficult to develop urban infrastructure in typical mountainous and valley areas with complex topography. There is a serious contradiction between the shortage of available land resources and the lack of natural "open flat land" suitable for large-scale engineering construction. This means that in the construction of this kind of mountain cities, the artificial high fill project will become one of the important ways to solve the problem of construction land. The stability of super-high embankment has become the key to the safe and stable operation of the project. Among the many factors affecting the stability of the super-high embankment, precipitation infiltration is the main factor that induces the unstable failure of the fill slope. Especially the threat to slope stability caused by continuous heavy rainfall can not be ignored. The influence mechanism of rainfall infiltration on the stability of super-high fill slope and the process of deformation and failure for the drainage design of fill body are studied. In view of this, the influence of continuous rainfall on the slope stability of a certain airport extension project in Chongqing is studied in this paper. In this paper, by means of collecting data and field geological survey, the engineering geology and hydrogeological environment conditions in the field area are found out, and the structural types of bedrock slope and the failure mode of the filling body heaped deformation are mastered. Through the field investigation before construction, we can master the terrain, geology and stability of bedrock slope in general. Based on the analysis of geological conditions, construction design scheme, field test, high fill deformation, settlement monitoring and related detection results, combined with engineering geology and numerical feedback simulation research. The stability of the high fill in the construction area is clarified, and the reference is provided for the construction design. Through site hydrogeological investigation and field monitoring and analysis of groundwater and pore water pressure, combined with field permeation test, the influence of rainfall infiltration on slope stability of ultra-high fill is clarified. This paper provides a reference for the stability and reinforcement design of high fill during airport construction. The main research work and results are as follows: 1 using the limit equilibrium principle and the stability calculation module in Geostudio software, the stability coefficient of super-high fill slope in different construction process is calculated. 2 the process and method of building complex mountain model are discussed by using finite difference method and FLAC3D software. (3) the deformation and stability of high fill slope are analyzed comprehensively and deeply, and the causes of such deformation and failure are explained from the mechanism and internal cause of formation. (4) through the FLAC3D numerical simulation, the stability analysis of the super-high fill slope shows that under the condition of complex foundation rock, the original foundation form. The stiffness of the foundation and the height of the fill have a certain influence on the deformation of the high fill slope. The deformation mode is mainly vertical deformation and accompanied by a certain amount of displacement outside the slope. 5. Select typical sections to simulate the stability of super-high fill slope under the condition of continuous rainfall in the study area, and obtain the curve of slope stability coefficient with rainfall duration. It is concluded that the maximum influence on slope stability is in 24 ~ 36 h of continuous rainfall, and the relevant measures are taken to ensure the stability of the slope. 6 select typical sections in the study area to study the slope stability in the concrete construction process. From the settlement isoline map, we can find that the maximum settlement does not occur in the top layer of the filling, but in the middle layer of the filling body. From the isoline diagram of shear strain increment, it can be found that the position of maximum shear strain increment is mostly concentrated at the junction of bedrock and fill body, so the base interface of bedrock is not easy to ignore.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU43

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