地下连续墙槽壁“缩颈”与地下水位关系研究

Study on Relationship between Slot Wall Necking of Concrete Diaphragm Wall and Groundwater Level

本文通过对地连墙地下水位、渗流路径的研究,分析了沿海区域粉细砂、淤泥质粉质粘土、砂层的地下水位和渗流路径等因素对地下连续墙成槽、泥浆的影响,尤其是对沿海区域地下连续墙成槽后槽壁“缩颈”的研究,通过采取施打降水井、降排水措施截断涨落潮对地下水位的补充,保证了施工期间泥浆的浓度,过程中通过超声波垂直度检测,有效控制了地下连续墙成槽期间和成槽后“缩颈”的问题,对于后续类似工程项目,具有重要的指导意义。

Based on the study on groundwater level and seepage path of concrete diaphragm wall,an analysis is carried out for the influence of such factors as groundwater level and seepage path of silty fine sand,muddy silty clay and sand layers in coastal area on the formation and mud concentration of concrete diaphragm wall,especially the slot wall necking after the formation of concrete diaphragm wall in coastal area.Dewatering wells and other dewatering/drainage measures are adopted to prevent rising and falling tides from groundwater level,which ensures mud concentration during construction process.In addition,the application of ultrasonic perpendicularity detection is an effective solution to the problem of slot necking during and after the formation of concrete diaphragm wall,which has important guiding significance for similar projects in the future.