中国岩溶2016，Vol.35Issue(6)：674-680,7.DOI:10.11932/karst20160609
贵广铁路甘棠江特大桥19、20号墩异常沉降原因分析及整治措施
Cause analysis and treatment measures to the abnormal subsidence of Gantangjiang bridge No.19&20 piers of Guiyang-Guangzhou railway
付开隆 1蒋良文 1冯涛 1刘蜀江1
作者信息
- 1. 中铁二院工程集团有限责任公司,成都610031
- 折叠
摘要
Abstract
From May 15,2014 to September 1,the No.19 and No.20 piers of Gantangjiang super major bridge at Guiyang-Guangzhou railway had experienced abnormal subsidence with the downward displacement of 50.6-52.2 mm and 12.4-16.3 mm,respectively.In order to understand the reason of the subsidence and to propose appropriate measures to the problem of bridge pier displacement,mobile drilling,in situ and laboratory geotechnical tests were completed.Field observation and testing data jointly shew that the agelong heavy rainfall condition and subsequent underground karst water fluctuation caused karst collapse occurred at the underlying strongly karstified limestone.This was the main reason of geological impact on the subsidence of No.19 and No.20 piers with friction pile foundation and the pile length of about 20 m.For engineering remediation,end bearing pile foundations were respectively added in the both bridge piers.After about 1 year's displacement monitoring,the subsidence of the piers has been properly controlled,which suggest that the reinforced measurement is safe and reliable;and the end bearing pile foundation is generally suitable when other railway bridges are carried out in the similar case of deep covered strong karst limestone area.关键词
桥墩异常沉降/原因分析/岩溶塌陷/细粒土流失/整治/甘棠江特大桥Key words
bridge pier subsidence/cause analysis/karst collapse/fine-grained soil loss/engineering remediation/Gantangjiang railroad bridge分类
交通工程引用本文复制引用
付开隆,蒋良文,冯涛,刘蜀江..贵广铁路甘棠江特大桥19、20号墩异常沉降原因分析及整治措施[J].中国岩溶,2016,35(6):674-680,7.
