劲性复合管桩承载力设计的应用研究

Application research on the bearing capacity design of stiff composite pipe piles

针对已有典型工程案例的单桩竖向极限承载力进行分析,开展不同地质条件的现场试验,采用与实际受荷性状接近的竖向抗压桩的试验方法,确定单桩竖向极限承载力,在此基础上提出劲性复合桩的承载力修正公式。在连镇铁路五峰山特大桥和跨宁启特大桥基础的工程桩试验验证,表明改进的公式具有较高的可靠性,为该桩型进一步推广应用提供技术依据。

This paper analyzes the vertical ultimate bearing capacity of single piles in typical engineering cases,and carries out field tests of different geological conditions.The test method of vertical compression piles close to the actual load bearing behavior is used to determine the single pile.Based on the vertical ultimate bearing capacity,the correction formula of the bearing capacity of the stiff composite pile is proposed.The test results of the engineering piles on the foundation of the Wufengshan Bridge and the Crossing Ningqi Bridge of the Lianzhen Railway show that the improved formula has higher reliability and provides the technical basis for further promotion and application of the pile type.