基坑工程潜水涌水量研究及双井回灌参数化分析

发布时间：2018-08-27 05:53

【摘要】：随着城市的大发展,越来越多的城市中心区域出现高层及超高层建筑物,随之带来的就是超深基坑等地下工程建设。而在有些地下水位较高的城市(如上海、天津等)地下工程建设的过程中,地下水的处理则是其中一个难点。由于超深基坑受到承压水的影响,基坑施工中除了考虑潜水层的施工降水以外,还要根据基底抗承压水稳定验算。若不能进行合理的承压水突涌验算,尤其在承压水水位较高区域,当坑底承压水压力增加到一定程度时,基坑内隔水层土体即会发生涌砂、开裂、变形过大等形式的突涌破坏。本文主要针对上述问题进行以下几方面的研究:1、主要结合天津地区土层及地下水的分布特点,通过典型工程案例以及数值软件模拟总结出关于天津地区基坑潜水降水、承压水降压的涌水量的经验值,为天津地区的基坑工程中设计的降水涌水量问题提供一些帮助。2、天津于家堡地区出现较多的大面积基坑群降水,降水不但会对周边已有建筑物产生影响,部分区域由于紧邻海河,大面积长期的降水,尤其是深层的承压水降压可能会导致海河海水入侵到基坑的围护结构。海水会对其围护结构造成腐蚀,甚至破坏结构本身。本文主要研究由于大面积基坑群降水造成的海水入侵,以及利用回灌措施对入侵进行防治,并对回灌井的各种参数进行分析,寻找最佳方案。3、针对目前还较少应用的双井回灌进行参数化研究,分别给定回扬抽水流量分析回灌井的位置、给定回灌井的位置分析回灌流量两种方式综合分析,并对比分析,探索出双井回灌的部分规律。
[Abstract]:With the development of the city, more and more high-rise and super-tall buildings appear in the central area of the city, which brings about the construction of underground engineering such as ultra-deep foundation pit. In some cities with high groundwater level (such as Shanghai, Tianjin, etc.), the treatment of groundwater is one of the difficulties. Due to the influence of confined water on the ultra-deep foundation pit, in addition to considering the dewatering of the submersible layer in the foundation pit construction, it is also necessary to check and calculate the stability of the foundation pit based on the anti-pressure water. If it is not possible to carry out a reasonable check calculation of the burst of confined water, especially in the area of high water level of confined water, when the pressure of pressurized water at the bottom of the pit increases to a certain extent, the soil of the waterproof layer in the foundation pit will gush, crack, and cause sudden surge failure in the form of excessive deformation. This paper mainly focuses on the following aspects: 1, combining the distribution characteristics of soil layer and groundwater in Tianjin area, through typical engineering cases and numerical software to summarize the groundwater precipitation of foundation pit in Tianjin area. The empirical value of pressure relief water discharge of confined water provides some help for the design of precipitation discharge in the foundation pit engineering in Tianjin area, and there is more precipitation in large area of foundation pit in Jiapu area of Tianjin. The precipitation will not only affect the existing buildings around the Haihe River, but also lead to sea water intrusion into the enclosure structure of the foundation pit in part of the area, especially in the deep confined water, because of the large area of long-term precipitation. Seawater can corrode its enclosure and even destroy the structure itself. This paper mainly studies the seawater intrusion caused by the precipitation of large area foundation pit, and uses the recharge measures to prevent the invasion, and analyzes the various parameters of the recharge well. To find out the best scheme. 3. To carry out parameterized research on dual well recharge, which is seldom used at present, to analyze the position of recharge well and the position of given recharge well to analyze the recharge flow rate, respectively, and to compare and analyze the two ways. Some rules of double well recharge are explored.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753

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