孟加拉卡纳普里河底隧道富水砂层深大基坑降水设计

以孟加拉卡纳普里河底隧道项目明挖及工作井段深基坑为背景，针对其复杂的工程地质及水文条件，结合支护方案及周边环境，采用疏干与合理布置降压井对深大基坑进行降水，并实时监测支护结构及周边敏感建筑物位移、沉降。监测数据表明：降水方案效果良好，支护结构及周边建筑物指标控制较好。

Design of Deep and Large Foundation Pit Dewatering in Water-rich Sand Layer of BottomTunnel of Karnaphuli River in Bangladesh

Taking the tunnel project under Karnaphuli River in Bangladesh with open cut and deep foundation pit of working well section as the background, aiming at its complex engineering geological and hydrological conditions, combining the support scheme and surrounding environment, and reasonable arrangement of dredging and depressurization wells is used to dewater the deep and large foundation pit, and real-time monitoring of the displacement and settlement of the supporting structure and surrounding sensitive buildings is carried out. The monitoring data shows that the precipitation program has a good effect and the supporting structure and surrounding building indicators are well controlled.