Engineering characteristics of PHC piles in coral gravel sandstone area of East Africa
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摘要:
东非坦桑尼亚达累斯萨拉姆港码头项目地处珊瑚礁砾砂岩地区，采用PHC桩作为桩基础，桩径分别为800 mm和1 000 mm。通过珊瑚礁砾砂岩的土工试验和不同桩径PHC桩沉桩规律研究，得到珊瑚礁砾砂岩碎屑的PHC桩-土界面峰值摩擦角和残余摩擦角值。通过总结2种桩径各200根基桩的沉桩规律，得到桩靴长度为1.5 m的φ800 mm和φ1 000 mm PHC桩进入强风化珊瑚礁砾砂岩深度及沉桩规律；珊瑚礁砾砂岩地区φ1 000 mm PHC桩比φ800 mm PHC桩穿透能力强，φ1 000 mm PHC桩宜采用高程控制为主、贯入度为辅的终锤标准，而φ800 mm PHC桩可采用高程和贯入度双控进行沉桩施工。研究结果可为该地质条件下PHC沉桩施工及理论研究提供指导。
Abstract:
The Dares Salaam project in Tanzania locates in the coral gravel sandstone area. PHC piles with diameter of 800 mm and 1 000 mm are used as pile foundation. Carrying out the geotechnical test on coral gravel sandstone and studying on the law of pile sinking with difference diameter of PHC pile，we obtain the peak friction angle of PHC pile-soil interface of coral gravel sandstone debris and the residual friction angle. Summarizing the law of piling of 200 foundation piles with 1.5m long pile shoe and with diameter of 800 mm and 1 000 mm respectively，we get to know the depth of piles into the strongly weathered coral reef limestone and law for pile sinking. The penetration ability of the 1 000 mm-diameter pile is stronger，and its elevation control shall be taken as the main criterion，while penetration shall be the complementary for sinking stopping. But both are main criteria for 800 mm-diameter piles. The research results provide a guidance for PHC sinking and theoretical research under similar geologic conditions.
