桥梁桩基础设计的岩土参数标准值统计应用  

An Application of Rock Parameter Standard Value Statistics of Bridge Pile Foundation Design

作　　者：窦文俊[1] 卢永成[1] 黄虹[1] 高大铭[1] 

机构地区：[1]上海市政工程设计研究总院,上海200092

出　　处：《中国市政工程》2010年第6期65-68,共4页China Municipal Engineering

摘　　要：现行岩土工程勘察规范(国标)及公路规范中岩土参数、岩石强度标准值的确定,基本上吸取了适用于小样本的t分布统计方法。通过对东海大桥陆上段桥梁各墩的沉桩施工及静力触探Ps标准值的统计分析表明,为保证各墩台岩土参数标准值95%的置信概率,在工程详勘阶段应按规范采用小样本统计。因此,对于长大桥梁,如高架道、大型立交、长大引桥等,应根据土层、土质均匀性变化情况合理划分区段进行统计,而对桥梁大型基础则应单独统计。The t-distribution statistics method being suitable for small sample embodied basically in Code for Investigation of Geotechnical Engineering(National Standard) and code for highways is used to determine rock parameter and rock strength standard value.Through a statistical analysis of pile sinking construction and standard value Ps of different pier on the land of Donghai Bridge,it may show that small sample statistics shall be adopted according to the code during the stage of engineering investigation to guarantee the confidence probability of 95% for the rock parameter standard value of different pier.Therefore,to long & large bridges such as viaducts,large-scale interchanges and long & large approach bridges,it shall make a distribution statistics according to soil layer and soil quality uniformity changes;and to large-scale foundation of bridges,it shall make a seperate statistics.

关 键 词：桥梁桩基础 岩土均匀性 变化随机性 小样本统计 划分区段 岩土参数标准值 

分 类 号：U442.2[建筑科学—桥梁与隧道工程]