我项目部承建的恒阳花苑住宅小区内,有多层住房、高层住房、综合楼等,占地面积为6万多m2。室外雨水、污水管道和窨井布置密集。工程处于地下水位高、粉砂质粘土中。开挖管道基槽和窨井基坑时,刚挖至设计底标高,来不及做垫层,就发生塌方和窨井基坑内积水。频繁抽水和多次清除基坑内的塌 In the residential area of ​​Hengyang Garden, which is constructed by our project department, there are multi-storey houses, high-rise houses and comprehensive buildings, covering an area of ​​more than 60,000 m2. Outdoor rainwater, sewage pipes and cellar layout intensive. The project is in high groundwater level, silty clay. Excavation of the foundation trench and the scouring pit pit, just dig to the design of the end elevation, too late to do cushion, landslides and scour pit pit occurred. Frequent pumping and multiple pit clearance