地铁空间施工中基坑降水对渗流场的影响模拟预测研究

Simulation and prediction study on the effect of pitfall on seepage field during metro space construction

为了对地下水层结构稳定性进行模拟预测,从而保障地铁施工过程的安全,研究利用构建的地质水文模型分析测试三种基坑降水方案的性能。研究结果表明,隔水帷幕下辐射井降水方案在辐射管管径为0.1~0.3 m时,疏降时间维持在5~12 d,最大总抽水量为291279.124 m^(3)。实践结果证明隔水帷幕下辐射井降水方案降水效果较好,应用价值更高,对地铁空间施工中地下地质水文结果的稳定性提升有帮助。

In order to simulate and predict the stability of underground water layer structure,so then ensure the safety of subway construction process,a geological hydro-logical model was constructed to analyze and test the performance of three foundation pitfall schemes.The research results indicate that under the waterproof curtain,the radiation well rainfall scheme maintains a drainage time of 5~12 days with a maximum total pumping capacity of 291279.124 m^(3)when the diameter of the radiation pipe is 0.1~0.3 m.The practical results have proven that the radiation well rainfall scheme under the waterproof curtain has better rainfall effect and higher application value,which is helpful for improving the stability of underground geological and hydro-logical results in subway space construction.