基坑止水帷幕优化设计探讨

Discussion on optimization design of the water sealing curtain in foundation pit

在基坑降水过程中,外围地下水位降低会对已有建筑物或设施产生不利影响。因此,基坑止水帷幕的设置是工程中至关重要的部分。为了选择合适、经济的桩型,需要对止水帷幕的选择方案进行优化分析。本文按照控制基坑外某一点地下水位降落值为约束条件,以总造价最小作为目标函数,利用有限元软件模拟基坑降水时的渗流场。通过模型模拟的方法,把已列出的方案进行分析修改,最终确定最优方案。结论表明,对止水帷幕方案进行优化分析非常有必要,可以使设计人员更准确地把握方案的优劣。

The dewatering in foundation pit would be harmful for the existing buildings or facilities.So it is very important that the settings of the water sealing curtain in foundation pit.It is necessary to optimize and analyze the schemes in order to choose the most suitable and economic piles.Taking the groundwater line drawdown value of one point outside the foundation pit as the constraint condition and taking the minimum cost as the target function,the seepage field is simulated by using the finite element software.The design schemes are analyzed and modified by using the model simulation method and then the best optimal scheme is decided.The conclusion shows that it is very necessary to optimize the water sealing curtain schemes,which could enable the designer to master the advantages and disadvantages of the schemes accurately.