珊瑚礁灰岩地区超长钢管桩工程性状

Engineering characteristics of super long steel pipe pile in coral reef limestone area

针对珊瑚礁灰岩地质下超长钢管桩的工程性状的研究,结合东非某水工项目的桩基施工情况,剖析钢管桩在该地质情况下的沉桩规律。该桩基为1.2m直径钢管桩,采用锚桩法进行3根基桩静载荷试验,分别为12、18和24mm壁厚,最大桩长为71.2m,基桩持力层为东非的珊瑚礁灰岩,进入持力层最大为31.8m。通过预先埋设在桩身上的低温敏光纤光栅传感器,结合沉桩规律总结和静载荷试验,揭示不同桩顶荷载作用下珊瑚礁灰岩的工程特性。为该地质条件下钢管桩设计及理论研究提供参考。

In order to enrich the domestic industry’s research on the engineering characteristics of super-long steel pipe pile under coral reef limestone geology,combining with the pile foundation construction of a hydraulic project in East Africa,we analyze the rules of pile sinking of steel pipe pile under this geological condition.The 1.2 m-diameter steel pipe piles are used in this project.The anchor pile method of static load test is used for three piles,with 12 mm,18 mm and 24 mm wall thickness respectively and the maximum pile length of 71.2 m.The pile bearing layer is coral reef limestone and has a maximum into the bearing layer of 31.8 m.Through the low-temperature sensitive fiber grating sensor embedded in the pile,the engineering characteristics of the coral reef limestone under different pile top loads are revealed by the pile-sinking rule and static load test,It provides reference for the design and theoretical research of steel pipe piles under coral reef limestone.