采用降低坑底土层渗透性的措施和选择最佳的降水深度能有效地控制坑外地表的沉降。
By reducing the permeability of soil at the bottom of pit and selecting optimal dewatering depth, the settlement of ground surface can be well controlled.
对于降水深度不大的砂性土地基，一般选用轻型井点降水，可以满足安全、适用、经济的要求。
For the sandy soil foundation with not large drop depth it generally selects to use light well drop, so it can meet the requirement of safety, adaptation and economy.
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