水位降深

Because of the high water level and large permeability in sand, the cement mixing pile was also used as the anti-seepage pensile curtain, and deep-well system was set up at the same time to depress the water line.

场地水位高且与闽江有直接水力联系，砂层渗透系数大，设计最大坑内水位降深为11m，通过设置水泥搅拌桩悬挂止水帷幕，采用深井降水系统成功地降低了坑内水位。

Based on data of pumping test, this paper summarized the variational law of well in phreatic aquifer of loess and the diversified relationship between water table and pumping time.

本文根据抽水试验资料总结了黄土潜水井水跃值的变化规律并分析了其成因；总结了水位降深随抽水时间的变化关系，并建立了经验公式；提出了公式中参数的确定方法。

In the paper,the critical water lever is determined according to the linear cor re lation between land subsidence and groundwater drawdown,simultaneously,as comp ared with the critical water level by preconsolidation stress,the results show t hat their physical meaning is agreeable for two methods of acquiring critical w ater le vel,only exist some differences on value domain.

该文通过地面沉降与地下水头降深之间的线性相关关系来确定临界水位，并将其与根据超固结应力确定的临界水位进行比较，结果表明：两种理论依据下提出的临界水位具有相同的物理意义，仅在值域上存在一些差异。

From overburden layer s,semipervious layers above depression-cone level drainage consolidation,porous media(geo-formation) compression and water compression,the ground settlement mechanism is analysed during foundation pit dewatering.

从降落漏斗水位以上覆盖层、弱透水层的排水固结过程到多孔介质的压缩、水的压缩三方面分析了深井降水引起地面沉降的机理，得出降水引起地面沉降的压缩层厚度主要为降落漏斗水位以上降深范围内的覆盖层和弱透水层厚度的结论。

As the caves and cracks developed in the carbonate rocks were usually joined together with the leterite foundation soil and the water acting in the caves and cracks erode the leterite foundation soil,so that the earth cave s be formed in the soil and will lead a building to destroy.

研究结果表明，在抽水降深12m的条件下，虽然教学大楼地基中的岩溶地下水位与基岩面高程比较相近，有可能导致土洞形成，但由于该建筑场地土层厚度较大，胶结较为紧密，粗颗粒含量较多，可在一定程度上抑制土洞向地表塌陷发展的进程。

The procedure is applied in two projects:(1) Shanghai Huanqiu finance center tower foundation pit dewatering, the complicated flow state of groundwater is simulated under these conditions which the aquifers deposite layer by layer, the bottom of the aquifers goes deep to 149m, the horizontal flow barrier goes deep to 34m, the extraction wells are penetrated to 55m, the filters of the extraction wells are located between 34m to 55m, and the water level in the deep foundation pit is decreased to 26m under land surface, the result of 8 pumping wells optimization project is designed.(2) The forth subway of Dong Jia-du tunnel repair foundation pit dewatering in Shanghai, the complicated flow state of groundwater is simulated under these conditions which the aquifers deposite layer by layer, the bottom of the aquifers goes deep to 144.45m, the horizontal flow barrier goes deep to 65m, the extraction wells are penetrated to 60m, the filters of the extraction wells are located between 45m to 60m, and the water level in the deep foundation pit is decreased to 42.45m under land surface, then an optimization project is designed.

最后将成果分别应用于两个工程实例中：(1)上海环球金融中心塔楼基坑降水，模拟了在多层含水层复合存在、含水层最深底板埋深达149m、基坑周围挡水连续墙埋深达34m、抽水井埋深达55m、抽水井过滤器埋深为34至55m，基坑内地下水位降至埋深达26m的情况下的地下水复杂流动状态，得出了8口抽水井优化降水方案；(2)上海地铁4号线董家渡隧道修复基坑降水，模拟了在多层含水层复合存在、含水层最深底板埋深达144.45m、基坑周围挡水连续墙埋深达65m、抽水井埋深达60m、抽水井过滤器埋深为45至60m，基坑内地下水位降至埋深达42.45m的情况下的地下水复杂流动状态，确定出了最优降水方案。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。