The optimal designing theory of deep foundation pit dewatering for controlling land subsidence was discussed in loose sediment with great thickness and complex characteristics.

优化设计理论的深基坑降水，地面沉降控制在松散沉积物厚度大，复杂的特点进行了讨论。

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The paper expounds the control on ground water table both in and out of foundation pit for foundation pit dewatering, and discusses the utilization of drained ground water in dewatering engineering.

对基坑降水中基坑内外的地下水位控制措施进行了论述，并探讨了降水工程中排出的地下水进行综合利用的问题。

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Dewatering for different foundation pit fencing structures in soft ground has different impacts on the head of ground water, causing different ground settlement.

不同的软土地基基坑围护结构降水设计对地下水水头有不同的影响，从而产生不同的地面沉降。

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