天津站交通枢纽基坑降水工程策略

Dewatering strategy of foundation pit engineering at Tianjin transport hub

根据地质勘察报告确定了天津站地下含水层分布,分别对现场大型单井抽水试验和群井抽水试验进行了参数反演和数值模拟,得到了各含水层类型和水文地质参数,为基坑降水设计提供了依据。应用基坑底板突涌稳定验算公式确定了各开挖深度的安全水位埋深,针对基坑降水工程中的疏干和降压目的,分别布置了疏干井和降压井。为保证基坑工程安全实施,在考虑环境影响的同时研究设计了应急预案。

According to the geological survey report the distribution of the aquifers were found out.Through the inverted calculation and numerical modeling based on the aquifer tests including single well tests and group wells tests for every aquifer, the hydro-geological parameters which are the basis of the design of the dewatering engineering$were obtained.The heaving stability formula was used to control the groundwater level in the pumping wells.The dewatering wells and water head reducing wells were employed.The influence of the environment caused by the lowing the groundwater level in dewatering engineering was evaluated,and the emergency pump and schemes were prepared as the precautions for emergencies related to the underground water.