【摘要】 介绍采用自平衡法在GMS湄公河大桥桩基承载性能检验情况。结合检测工况对自平衡测试数据的影响,采用摩擦桩位移协调转换法和嵌岩桩的荷载协调转换法,获得P-S曲线。所得测试结果表明湄公河大桥桩基承载力符合设计要求;分析获得湄公河大桥试桩的侧摩阻力和端承力分布,结果表明湄公河大桥地区各土层发挥的侧摩阻力值与《公路桥涵地基与基础设计规范》(JTG D63-2007)所列侧摩阻力标准值一致。文中还分析实际检测工况中诸因素对自平衡法检测所获侧摩阻力-位移结果的影响,进一步分析表明,嵌岩桩中所得侧摩阻力-位移关系存在特殊性,继续完善桩-岩关系可更广泛推动自平衡法在嵌岩桩承载力检测中的应用。更多还原

【Abstract】 A self-balance method was used to evaluate bearing performances of GMS Mekong Bridge pile foundations. Considering detecting condition impacts on test data by using the self-balance method, conversion methods(displacement compatibility for friction piles and loads compatibility for rock-socket piles) were employed to obtain p-s curves. Test results show that Mekong Bridge pile foundations meet design requirements. Distributions of the lateral frictions and end bearing capacities for Mekong Bridge test piles show that shaft friction values of soil layers under Mekong bridges are consistent with those specified in "Codes for design of basements and foundations of highways, bridges and culverts"(JTG D63-2007). Factors impacting on a relationship between the lateral frictions and the displacements(obtained from the self-balance method) are presented. Further research on a relationship between the shaft frictions and the displacements for rock-socket piles is needed for identifying the rock-socket pile bearing capacities.更多还原