围护结构封闭条件下断层及溶蚀带抽水试验研究

Experimental Study on Pumping Water from Fault and Dissolution Zone under Closed Condition of Envelope

为降低白云机场T3交通枢纽站基坑开挖的风险,在围护结构封闭条件下对F1断层及溶蚀带进行抽水试验,得出F1断层及溶蚀带地下水为岩溶水及构造裂隙水,具承压性,平均渗透系数为1.41m·d^(-1),基坑开挖过程有较高突涌水风险等结论,建议在后续施工过程中开展动态止水、防水设计,为类似断层及溶蚀带不良地质下的基坑施工提供了参考。

In order to reduce the risk of excavation of the foundation pit of the T3 transportation hub station at Baiyun Airport,a pumping test was conducted on the F1 fault and the dissolution zone under the condition of closed enclosure structure.It was concluded that the groundwater in the F1 fault and dissolution zone is karst water and structural fissure water,which is pressurized with an average permeability coefficient of 1.41m·d^(-1).During the excavation process,there is a high risk of sudden water inrush.It is recommended to carry out dynamic water stop and waterproof design in the subsequent construction process,which provides a reference for foundation pit construction under similar fault and dissolution zone unfavorable geological conditions.