基于凝灰岩抗压强度的高架道路嵌岩桩设计与施工

Design and Construction of Rock-socketed Pile for Viaduct Based on Compressive Strength of Tuff

城市高架道路在城市快速路路网建设中具有举足轻重的作用。但在工程地质勘察中,尚无专门针对城市高架道路勘察的规范,往往是参考一些通用或相关的规范,来处理在勘察中的一些具体问题。本文以绍兴市快速路改造高架工程为例,实地钻取凝灰岩岩芯,并进行单轴抗压强度试验,利用统计方法确定了单轴抗压强度的标准值,并结合公路规范和桩基规范计算了嵌岩桩的轴向承载力和竖向极限承载力,分析了其影响因素。研究成果为高架道路勘察软岩区嵌岩桩桩基设计提供了依据。

At present,urban viaducts play an important role in the construction of urban expressway network.While there is no special specification for the survey of urban viaduct in the engineering geological survey,it often refers to some general or related specifications to deal with some problems in the survey.The study taking Shaoxing expressway reconstruction project as an example,the tuff core is drilled in the field,and the uniaxial compressive strength test is carried out to determine the standard value of uniaxial compressive strength by using statistical method.The axial bearing capacity and vertical ultimate bearing capacity of socketed pile are calculated combined with highway code and pile foundation code,and the influencing factors are analyzed.The result provides a basis for the design of rock-socketed pile foundation in soft rock area of viaduct survey.