摘要
深厚砂卵石覆盖层岩溶地区施工桩基时,漏浆、塌孔、偏孔和埋钻是最普遍现象,由于深厚砂卵石覆盖层的孔壁极不稳定,容易引起覆盖层连锁坍塌,埋钻或地陷现场经常发生。目前国内岩溶地区桩基大都以冲孔灌注桩为主,旋挖成孔灌注桩为辅,合适的桩基成孔工艺和施工措施是特殊地质条件下桩基施工成功的关键因素。本研究全面对比了在郑万高铁湖北段某大桥项目深厚砂卵石覆盖层岩溶地区桩基施工过程中,冲击钻与旋挖钻两种不同的施工工艺的异同及优缺点,分析两种不同成孔工艺的各自施工病害发生原因和机率,综合考虑了施工质量及对环境影响等多方面因素,获得了深厚砂卵石覆盖层岩溶地区桩基成孔的有效经验。
Mortar leakage,wall collapse,hole shift and buried drill are the most common phenomena when pile foundation is constructed in Karst area with thick sand and pebble overlay. Such phenomena are easily happened due to the instable hole wall under this overlay. Currently,pile foundation constructed in Karst area is dominated by impact-cone cast-in-situ pile followed by rotary drilled cast-in-situ pile,proper hole boring technology and construction measures are the key factors in construction of pile foundation under special geological conditions. The similarities, differences, advantages and disadvantages of percussion drilling process and rotary drilling process,which are adopted in the construction of pile foundation in Karst area with thick sand and pebble overlay in a bridge project in Hubei section of Zhengzhou-Wanzhou highspeed railway,are comprehensively compared. The cause and possibility of construction disasters of the 2 technologies are analyzed,various factors such as construction quality and environmental impact of the 2 technologies are considered,and the experience of hole forming technology of pile foundation in karst area with deep sand and pebble overlay is obtained.
出处
《公路交通科技》
CAS
CSCD
北大核心
2018年第S1期153-158,共6页
Journal of Highway and Transportation Research and Development
关键词
桥梁工程
深厚砂卵石
深桩成孔工艺
岩溶地区
旋挖钻进
冲击钻进
bridge engineering
deep sand and pebble
deep pile hole forming technology
karst area
rotary drilling
percussion drilling
