公路桥梁超长钻孔灌注桩的可靠度研究

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．

Research on Reliability of Super-Long Bored Pile in Highways Bridge

With the investment of the national infrastructure, the construction of large bridges crossing the big river and harbor has become more and more common. The super-long bored piles with large capacity and adaptability have become increasingly widespread in the application of bridge foundation. The present design of bridge piles based on the ＂code for design of ground base and foundation of highway bridges and culverts＂ which most of the design parameters are summarized from the ordinary pile becomes unsuitable for the super-long bored piles because of the difference in the load transfer mechanism and deformation. Therefore, based on the information gathered from the pile tests, we can obtain the statistical parameter of the typical strata properties. Then calculating the reliability index value and analyzing the impact factor of reliability index. At last, it can provide a theoretical reference for the design of super-long bored pile.