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随着国家基础建设的投入,跨江、跨海湾大型桥梁建设日益增多,而超长钻孔灌注桩基具有承载能力强、适应性大的特点在桥梁桩基中应用也越来越广泛.超长钻孔灌注桩的荷载传递机理、变形沉降与普通桩型存在一定的区别,而目前公路桥梁桩基设计依据主要为《公路桥涵地基基础设计规范》,该规范设计参数大多数是在普通桩型基础上进行统计归纳的,对超长钻孔灌注桩的设计不具有针对性.因此论文在搜集超长桥梁桩基资料基础上,统计了典型地层土性参数,计算了目前公路桥梁中超长钻孔灌注桩的承载力的可靠度指标,并分析了影响其可靠度指标值的因素,为此后公路桥梁项目中超长钻孔灌注桩的设计提供一定的理论参考依据.
With the input of national infrastructure, the construction of large-span bridges across the river and across the bay is increasing day by day. However, the super-long bored and cast-in-place pile foundations have the advantages of strong carrying capacity and large adaptability, and are widely used in bridge pile foundations. The load transfer mechanism and deformation settlement of long bored piles have some differences from ordinary piles. At present, the design basis of highway bridges and bored piles is mainly “the code for foundation design of highway bridges and culverts”, and most of the design parameters of this standard are on ordinary piles Based on the statistical summary, the design of the super-long bored piles is not targeted.Therefore, based on the collection of super-long bridge pile foundation information, the paper statistics of typical formation of soil parameters, calculate the current highway bridge long The reliability index of the bearing capacity of cast-in-place bored pile and the analysis of the factors that affect its reliability index value, which will provide some theoretical reference for the design of super-long bored piles in highway bridge project.