长江漫滩地区深基坑管涌处理案例分析

Case History of a Piping Remediation in a Pipe Jacking Pit Site in Yangtze River Floodplains

在基坑施工过程中,由于降水措施或围护结构施工存在质量缺陷,容易引发基坑管涌事故。若应急不及时或施工处理方法不当,将严重影响基坑施工安全,威胁周边建筑物结构,造成更为严重的经济损失,产生不良的社会影响。以顶管工作井发生管涌事故为例,分析了基坑发生管涌事故的原因,阐述了应急处理措施,通过现场分析及专家评审,确定了封堵处理方案,采用围护结构加固、基坑降水、施工监测等综合方法,有效地控制了管涌险情的进一步发展,确保了工程顺利进行。

During the deep excavations in the high groundwater area,the piping hazards are frequently encountered due to the inadequate dewatering measured or inappropriate supporting structure.If these piping hazards are not promptly remediated or inappropriately treated,the safety of the deep excavation will be jeopardized and excessive deformation the supporting structure might affect the stability of adjacent buildings and other structures and even induces the loss of properties and human life.This paper presents a groundwater piping within a pipe jacking pit.Factors that might induce the piping were evaluated and the emergency response program was developed with structural supporting,dewatering and the construction monitoring program.The results indicate that these measures were effective.