上海陆家嘴地区回灌试验分析

地下水回灌试验表明地下水水位对地面沉降有直接的影响,当进行地下水回灌时,地下水位逐渐回升,地面产生回弹。地面沉降规律与地下水水位变化较为一致,水位回升越大,地面回弹也越大。地面沉降和回弹较地下水水位的变化有一定的滞后性。地下水水位的变化与所在点周围的地面沉降具有较好的时空对应关系。基坑降水设计可采取地表水回灌措施有效抑制地下工程施工过程中因工程降水引起地下水变化引起的地面沉降,基坑降水中选择坑内降水井抽出的地下水对坑外回灌井通过密闭管道在还原环境下实施回灌。

Analysis on Recharge Test at Lujiazui Area in Shanghai

The recharge test of groundwater at Lujiazui Area in Shanghai shows that the groundwater level has a direct impact on the land subsidence, during the recharge, the groundwater level rose gradually to produce ground rebound. The law of land subsidence and groundwater level is consistent with the ground water changes, greater the water level recovery, the greater the ground rebound would be. The changes of the subsidence lag behind the groundwater changes. The land subsidence has good corresponding relation in the space and time with the change of groundwater level. At pit dewatering design the water recharge measures can be taken to effectively inhibit the subsidence caused by dewatering groundwater changes. During the dewatering in the foundation pit to choose the groundwater from the dewatering well in the pit through the closed pipe connected to the recharge well outside the pit, the implementation of recharge is carried out under the reductive environment.