莫桑比克马普托大桥水文地质特征研究

Study on the Hydrogeological Characteristics of Maputo Bridge in Mozambique

以马普托大桥南锚碇深基坑工程为例,由于对下部细砂岩承压水认识不够,地下墙无法发挥阻隔效应,基坑在地下连续墙嵌岩的情况下,发生承压水突涌事故,坑外注浆堵漏效果不明显,致使基坑无法正常开挖施工,停工较长时间。拟采用减压降水进行地下水疏导,但必须对细砂岩重新认识,准确掌握场地的水文地质特征,合理利用参数进行降水设计是深大基坑降水工程中非常重要的一个环节。

The deep foundation pit project in the south anchorage of Maputo bridge as an example,due to the lack of awareness of the fine sandstone water,underground wall can not play the barrier effect,in the excavation of underground continuous wall rock under the condition of frequent confined water outburst accidents,hole grouting effect is not obvious,which can not be normal pit excavation,shut down a long time. The vacuum precipitation of groundwater dredging,but we need to recognize fine sandstone,accurately grasp the hydrogeological characteristics of the site,the rational use of the rainfall parameters design is a very important link in the dewatering engineering of deep foundation pit.