江苏扬州中海泵站地基处理施工中地下水位控制

Underground water control during foundation pit construction of Zhonghai Pumping Station in Jiangsu Province

江苏扬州中海泵站所在位置毗邻夹江,因夹江汇入长江处属感潮河段,致使建设区内不但地下水位高,而且地下水还随潮位的变化而变化。泵站地基采用水泥搅拌桩进行处理,桩长15 m,桩径0.6 m。为保证水泥搅拌桩的施工质量,防止地下水的流动和地下水位过高等因素对搅拌桩施工的影响,经多方案比选,决定采用管井井点法降低地下水位。在初步确定相关参数的基础上,布置管井方案,利用群井理论计算浸润线位置,并对初步方案进行了复核和调整,其计算结果与实际监测结果基本一致。

Zhonghai Pumping Station in Yangzhou City of Jiangsu Province is located near the outlet of Jiajiang River, a tidal branch of Jiajiang River to Yangtze River, where the underground water level is high and varies with the tidal fluctuation. The foundation of pumping station was treated by cement mixing piers with length of 15 m and diameter of O. 6 m. For preventing the influence of underground flow movement and high underground water level on the pier construction, and insuring the construction quality of cement mixing piers, through comprehensive comparison, the tube well method was adopted to lower the underground water level. On the basis of preliminarily determining correlative parameters and layout scheme of multi - well, we used multi - well theory to calculate the saturation line and then checked and adjusted the layout scheme. The calculated results were basically in accordance with the monitoring ones. The layout scheme of multi - well is introduced in detail.