考虑止水帷幕的深基坑降水预测解析计算

提出止水帷幕条件下的深基坑降水预测的解析算法。以武汉长江航运中心深基坑为实例，概化其水文地质模型，以现场抽水试验数据分析止水帷幕的止水效果。基于此，修正非完整型干扰井群降深公式，结合镜像法原理编制计算程序进行降水预测解析计算，并与实测结果和数值模拟结果分别进行对比验证。研究表明：所概化的水文地质模型为承压含水层，东侧止水效果最差，南侧止水效果不如北侧，西侧止水效果最好。按原布井方案进行降水解析计算发现，在基坑南侧将达不到安全降水的目的，当增加2口降水井后降水效果有所改善，与实测结果和数值模拟结果基本一致。研究成果可指导工程设计，具有一定的实际应用价值。

Dewatering forecast of deep foundation pit considering waterproof curtain using analytic approach

The objective of this study is to provide an analytical approach to the dewatering forecast of deep foundation pit under the condition of waterproof curtain. The hydrogeological model is generalized in a case study of deep foundation pit of Wuhan Changjiang Shipping Center. Effectiveness of waterproof curtain is analyzed using field pumping test. A modified non-complete well group formula associated with the mirror method is used to conduct the dewatering forecast. The results are therefore compared with numerical results and measured results respectively. Results show that simplified hydrogeological condition is confined aquifer. The effectiveness waterproof curtain of the eastern side is the worst. The north is better than the south, and the best is on the west side. According to the calculation results of original well spacing plan, there will not be safe in the south of deep foundation pit. Dewatering effect is improved after adding two dewatering wells. The analytic solution is consistent with the numerical results and the measured results.