复杂地层中超深地下连续墙的质量控制研究

Study on quality control of ultra deep diaphragm wall in complex stratum

落底式地下连续墙和内支撑,是控制侧壁变形和周边沉降的有效手段。但对于软土地区高承压水地质条件下的深基坑,如何保证槽壁稳定、垂直度控制以及接头渗水,依然是困扰设计和施工的重大难题。以实际工程为例,通过采用泥浆质量把控、配备垂直度监测和纠偏装置的成槽机、以及改进的H型钢接头等技术,有效解决深基坑变形和止水问题。研究成果对于软土地区高承压水地质条件下深基坑设计和施工具有重要的参考价值。

Bottom-fall diaphragm wall and bracing system is the effective technology for confined water foundation pit in soft soil area.However,the stability and construction precision of slurry trench,as well as diaphragm joints seepage resistance measure,are the key points of design and construction.Several Technology,such as mud quality control,a trenching machine which can monitor and verify Perpendicularity,and a new joints seepage resistance measure,are investigated by taking the actual project as example.The results show that those key problems can be solved well by the methods,and it should be valuable to solve deformation control and water curtain Technology for confined water foundation pit in soft soil area for design and construction.