以北京地铁8号线永定门外站为例，提出悬挂式帷幕阻水条件下基坑排水量计算方法以及悬挂式帷幕阻水中存在的问题。介绍了3种结合悬挂式帷幕采取的封底阻水措施，即水下灌注混凝土封底，深孔注浆封底以及超高压旋喷桩封底，并分别探讨了其优缺点。提出了悬挂式帷幕阻水结合基坑底部封底阻水的最佳建议方案，以达到有效节约地下水资源、降低工程施工难度和工程造价之目的。%Taking the Beijing Metro Line 8 Yongding outside as an example, the calculation method of the foundation pit drainage quantity under the suspension type water stop curtain and the problems in the suspended water curtain stop water are put forward. Discuss the advantages and disadvantages of three kinds of pit bottom measures, namely, underwater concrete grouting and sealing, deep hole grouting and deep ultra high pressure rotary spraying how to improve the permeability of bottom layer of foundation pit in order to achieve the purpose of ‘back cover”. Putting forward the best suggestion of the suspension type curtain stop water combined with foundation pit bottom treatment, in order to achieve the purpose of saving groundwater resources, reducing the dififculty of construction and engineering construction cost.
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