真空管井降水技术在上海古北国际财富中心工程中的应用研究

发布时间：2018-06-26 00:59

本文选题：真空管井 + 地面沉降　；参考：《湖北工业大学》2013年硕士论文

【摘要】：随着我国经济的迅猛增长，城市建设规模高速发展，同时涌现出大量深基坑工程。上海作为我国的经济中心，地处滨海平原，水文地质条件复杂，多年以来基坑降水一直是该地区深基坑工程的难题。工程实践证明，常规降水方法无法有效疏干上海地区深基坑工程中的界面残留水、上层滞水、弱透水层中的饱和水，这将对施工进度和施工安全产生很大影响。针对上海地区深基坑施工中的降水难题，论文将真空技术与管井技术相结合，提出真空管井降水技术，经济有效的解决了界面残留水、上层滞水、弱透水层中的饱和水的疏干难题。论文首先对真空管井降水的基本理论进行了研究。在分析降水目的和水文地质条件的基础上，得出真空管井降水适用的典型地层结构；得出了辅助真空对增大毛细水的渗流增强弱透水层的渗透性起了较大的作用；讨论了真空作用对不同特性含水层中地下水运动的影响，真空管井降水对水文参数的影响。论文以上海古北国际财富中心真空管井降水工程为依托，设计中采用了真空疏干井、真空混合井和减压管井的降水方案。介绍了真空管井降水系统的组成及原理、真空管井降水的施工工艺。并对真空管井降水设计中的渗流和地面沉降进行了计算，，根据上海地区水文地质特征建立了地面沉降计算模型，在分析水位降深及周边地面沉降的基础上，得出了真空管井作用下降水过程中降深及地面沉降的规律。发现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，距井点越近真空影响越明显，真空场只在井点附近一定范围内产生影响，在影响范围以外地下水仍然以重力的方式排出；真空管井降水期间地面沉降表现出三阶段规律，真空管井降水引起的沉降相对于建筑物总的沉降量较小。论文的研究成果为类似地层的工程提供了可借鉴的成功经验和方法，具有很大的推广价值和应用前景。
[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.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU463

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