深长嵌岩桩承载力计算方法研究

 基于收集的120根嵌岩桩试验数据，应用于大型公路桥涵及其他重大工程中的深长嵌岩桩(嵌岩深度大于5倍桩径)承载力的计算，沿用设计规范1]的形式及思路，对计算公式中岩层端阻发挥系数和侧阻发挥系数的取值进行分析研究，确定不同桩端岩石强度下岩层端阻发挥系数和侧阻发挥系数的取值，并引入到承载力计算公式。对西堠门大桥、青岛海湾大桥、荆岳长江公路大桥、坝陵河大桥等大型桥梁工程的试桩极限承载力进行验算，并将计算值和实测值进行比较，结果显示计算值和实测值吻合很好，能满足工程设计要求。

STUDY OF CALCULATING METHODS FOR BEARING CAPACITY OF DEEP-ROCK-SOCKETED PILE

Based on the database of 120 piles tests，for the calculations of bearing capacity of the deep piles (the socket depth greater than 5 times pile diameter) used in large highway bridges and culverts，considering the form and ideas in the specification1]，the factors of frictional resistance and base resistance related to the corresponding unconfined compression strength are analyzed for different ranges of unconfined compression strength and introduced in the formula. To verify the calculation formula，ultimate bearing capacity of tested piles of four projects，including Xihoumen Highway Bridge，Qingdao Bay Bridge，Jinyue Yangtze River Highway Bridge，and Balinhe River Highway Bridge，are checked. The results showed that calculated and measured values are in good agreement，to meet the engineering design requirements.