本文選題：真空管井 + 地面沉降　； 參考：《湖北工業(yè)大學(xué)》2013年碩士論文

【摘要】：隨著我國經(jīng)濟(jì)的迅猛增長，城市建設(shè)規(guī)模高速發(fā)展，同時(shí)涌現(xiàn)出大量深基坑工程。上海作為我國的經(jīng)濟(jì)中心，地處濱海平原，水文地質(zhì)條件復(fù)雜，多年以來基坑降水一直是該地區(qū)深基坑工程的難題。工程實(shí)踐證明，常規(guī)降水方法無法有效疏干上海地區(qū)深基坑工程中的界面殘留水、上層滯水、弱透水層中的飽和水，這將對(duì)施工進(jìn)度和施工安全產(chǎn)生很大影響。針對(duì)上海地區(qū)深基坑施工中的降水難題，論文將真空技術(shù)與管井技術(shù)相結(jié)合，提出真空管井降水技術(shù)，經(jīng)濟(jì)有效的解決了界面殘留水、上層滯水、弱透水層中的飽和水的疏干難題。論文首先對(duì)真空管井降水的基本理論進(jìn)行了研究。在分析降水目的和水文地質(zhì)條件的基礎(chǔ)上，得出真空管井降水適用的典型地層結(jié)構(gòu)；得出了輔助真空對(duì)增大毛細(xì)水的滲流增強(qiáng)弱透水層的滲透性起了較大的作用；討論了真空作用對(duì)不同特性含水層中地下水運(yùn)動(dòng)的影響，真空管井降水對(duì)水文參數(shù)的影響。 論文以上海古北國際財(cái)富中心真空管井降水工程為依托，設(shè)計(jì)中采用了真空疏干井、真空混合井和減壓管井的降水方案。介紹了真空管井降水系統(tǒng)的組成及原理、真空管井降水的施工工藝。并對(duì)真空管井降水設(shè)計(jì)中的滲流和地面沉降進(jìn)行了計(jì)算，，根據(jù)上海地區(qū)水文地質(zhì)特征建立了地面沉降計(jì)算模型，在分析水位降深及周邊地面沉降的基礎(chǔ)上，得出了真空管井作用下降水過程中降深及地面沉降的規(guī)律。發(fā)現(xiàn)真空管井降水的水位降深比普通管井降水的水位降深要大，距井點(diǎn)越近真空影響越明顯，真空?qǐng)鲋辉诰c(diǎn)附近一定范圍內(nèi)產(chǎn)生影響，在影響范圍以外地下水仍然以重力的方式排出；真空管井降水期間地面沉降表現(xiàn)出三階段規(guī)律，真空管井降水引起的沉降相對(duì)于建筑物總的沉降量較小。 論文的研究成果為類似地層的工程提供了可借鑒的成功經(jīng)驗(yàn)和方法，具有很大的推廣價(jià)值和應(yīng)用前景。
[Abstract]:With the rapid economic growth of our country, the scale of urban construction has developed rapidly, and a large number of deep foundation pit projects have emerged at the same time. As the economic center of our country, Shanghai is located in the coastal plain, and the hydrogeological conditions are complex. For many years, the dewatering of foundation pit has been a difficult problem for deep foundation pit engineering in this area. Engineering practice has proved that the conventional dewatering method can not effectively drain the residual water in the interface of deep foundation pit engineering in Shanghai area, the upper layer stagnant water, and the saturated water in the weak permeable layer, which will have a great impact on the construction schedule and construction safety. Aiming at the difficult problem of dewatering in deep foundation pit construction in Shanghai area, this paper combines vacuum technology with pipe well technology, and puts forward the vacuum pipe well dewatering technology, which can effectively solve the problem of interface residual water and upper layer stagnant water. The problem of draining saturated water in a weak permeable layer. Firstly, the basic theory of vacuum tube well precipitation is studied. On the basis of analyzing the purpose of precipitation and hydrogeological conditions, the typical stratigraphic structure suitable for dewatering in vacuum tube wells is obtained, and the auxiliary vacuum plays an important role in increasing the seepage of capillary water and enhancing the permeability of weakly permeable layer. The effect of vacuum action on groundwater movement in aquifer with different characteristics and the influence of vacuum well precipitation on hydrological parameters are discussed. Based on the vacuum tube well dewatering project of Shanghai Gubei International Wealth Center, the dewatering scheme of vacuum drain well, vacuum mixed well and decompression pipe well is adopted in the design. The composition and principle of vacuum tube well dewatering system and the construction technology of vacuum tube well dewatering are introduced. The seepage flow and land subsidence in the design of vacuum tube well dewatering are calculated. According to the hydrogeological characteristics of Shanghai area, the calculation model of land subsidence is established. Based on the analysis of the depth of water level and the surrounding land subsidence, The law of depth reduction and land subsidence in the process of precipitation under the action of vacuum tube well is obtained. It is found that the water level drop of vacuum tube well is greater than that of common tube well, and the effect of vacuum field is more obvious when the well is near the well point, and the vacuum field only affects in a certain range near the well point. The ground water is still discharged by gravity outside the influence range, and the ground subsidence of vacuum tube wells shows three stages during the precipitation period, and the settlement caused by the precipitation of vacuum tube wells is smaller than that of the total settlement of buildings. The research results of this paper provide successful experiences and methods for similar strata engineering, and have great value of popularization and application prospect.
【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU463

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