过滤管、止水帷幕对周边地面沉降影响的研究

Research on Effect of Filter Tube,Stop Water Heavy Curtain to Surrounding Ground Settlement

通过分析非完整井和隔水帷幕的减降作用,得出选用非完整井比完整井效果好的结论,继而引出减降系数的概念。在降水优化设计模型的建立中,以减降系数为目标函数,在保证基坑降深的前提下,使周边地面产生的沉降最小。通过国际证券大厦降水工程实例,利用程序进行计算,在保证基坑降深的前提下,找出水头降最低的止水帷幕的深度和滤水管长度的最佳组合值,为深基坑降水优化设计提供了一种思路。

By analyzing the reduction pressure action of non complete penetrateel well and stop water heavy curtain, the paper expounded that effect of non complete penetrateel well was better than complete penetrateel well and put forword the concept of reduction pressure coefficient. In setting up the model of optimizing design of dewatering program, the goal function （ reduction pressure coefficient） was to make surrounding ground .settlement minimum under the promises of ensuring foundation pit draw down. Through an example of dewatering engineering at international stock exchange hotel in Wuhan, calculating with program, and ensuring foundation pit draw down, the optimum unit value of depth of filter tube and stop water heavy curtain to make water drawdown minimum was got, and put forward a sort of method of thinking in optimizing design of foundation pit dewatering.