基于CPTU测试p-y曲线法及其在桩基水平承载中的应用  

A p-y curve method for defermining the horizontal bearing capacity of single pile based on CPTU test and its application

作　　者：李洪江[1,2] 刘松玉[1,2] 童立元[1,2] 

机构地区：[1]东南大学岩土工程研究所,江苏南京210096 [2]东南大学江苏省城市地下工程与环境安全重点实验室,江苏南京210096

出　　处：《岩石力学与工程学报》2017年第2期513-520,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(51279032);"十二五"国家科技支撑计划项目(2012BAJ01B02);江苏省建设系统科技计划项目(2014ZD66)~~

摘　　要：孔压静力触探(piezocone penetration test,CPTU)原位测试提供的是最直接、最原始的土性参数,可以精细化反映土层信息随深度的非线性变化。采用原位测试CPTU锥尖贯入参数对桩基水平承载力进行评价,建立锥尖参数与p-y曲线参数的综合对应关系,提出基于CPTU原位测试的单桩p-y曲线计算及水平承载力确定方法。依托典型场地(靖江长江漫滩,宿迁废黄河泛滥区,苏州昆山太湖流域)水平试桩资料,对比验证了CPTU法p-y曲线模型的准确性及其在桩基水平承载预测中的可行性。结论表明:CPTU测试p-y曲线法能准确反映水平受荷桩的土抗力发挥特点,是一种高效、快速的桩基水平承载力确定方法。Piezocone penetration test（CPTU） has advantages in directly providing the most original soil parameters and reflecting in detail the nonlinear variation of deformation with depth. The relationships between the parameters of piezocone profiles and the parameters of p-y curve were established and the p-y curve method using the CPTU data for determining the horizontal bearing capacity of single pile was proposed. The method was verified by comparison with the in-situ pile data from Jingjiang,Suqian and Kunshan sites. Results indicate that the p-y curve method based on CPTU can accurately reflect soil resistance development characteristics,which is a highly efficient and rapid method for determining the horizontal bearing capacity of pile foundation.

关 键 词：桩基础 孔压静力触探 P-Y曲线 水平承载力 原位测试 

分 类 号：TU473[建筑科学—结构工程]