珊瑚礁地层桥梁基础钢管打入桩承载特性

钢管桩基础作为桥梁、港口码头、海上风机、近海钻井平台等领域广泛应用的基础型式之一,单桩竖向承载力是钢管桩基础设计的关键内容之一。但由于珊瑚礁地质条件复杂性,珊瑚礁地质钢管桩承载特性尚未明确。对中马友谊大桥28根钢管桩基础开展试验研究与数值计算,结果表明中等-强胶结的礁灰岩地层取芯岩样具较高抗压强度,能提供一定桩端承载力,可作为临时结构打入桩基础的持力层。揭示了珊瑚礁地质钢管桩承载机理,提出了改进的钢管桩竖向承载力设计方法,为珊瑚礁地质区域的工程建设提供有力支撑。

Study on bearing characteristics of steel pipe driven pile for bridge foundation in coral reef

As one of the widely used foundation types in the fields of bridge, port, offshore fan and offshore drilling platform, the vertical bearing capacity of single pile is one of the key contents in the design of steel pipe pile foundation. However, due to the complexity of the geological conditions of coral reefs, the bearing characteristics of steel pipe piles in coral reefs are not clear. The experimental study and numerical calculation of 28 steel pipe pile foundations of Zhong-ma friendship bridge are carried out. The results show that the core rock samples of medium strong cemented reef limestone stratum have high compressive strength, can provide a certain bearing capacity of pile end, and can be used as the bearing layer of temporary structure driven pile foundation. The bearing mechanism of steel pipe pile in coral reef geology is revealed, and the improved design method of vertical bearing capacity of steel pipe pile is put forward, which provides strong support for engineering construction in coral reef geology area.