摘要
针对地下一定深度处圆形均布荷载作用引起的地基压缩问题,对Mindlin位移解进行优化,根据岩土体原位自平衡试桩测试的桩端Q-S曲线建立单桩基底沉降计算的半经验半理论方法。假设试桩试验所得Q-S曲线为双曲线方程,建立双曲线模型,将改进的Mindlin位移解与原位Q-S曲线相结合获得土体的初始切线模量;利用桩端土体应力应变的DuncanChang模型假设,计算出桩轴线以下不同深度岩土体的切线模量,并将其应用于分层总和法地基沉降计算中,同时引入修正系数R_m,获得基底沉降量理论解。通过对大量实测数据与理论计算进行对比研究,获了修正系数R_m在桩底处于不同类型持力地层中的经验取值范围,建立地下深部基底沉降量计算的双曲线切线模量法,为深长桩基的沉降计算理论发展提供新的参考途径。
A new semi-empirical method settlement computation of the foundation is presented to calculate the subgrade settlement during circular uniform loading at a certain depth,basing on in-situ O-cell testing Q-S curve.Supposing that the load settlement Q-S curve at pie bottom is governed by a hyperbola equation,a hyperbola model is established.The tangent modulus is obtained from the Duncan-Zhang model and the improved Mindlin equation.Combining a large amount of measured data and theoretical calculation comparison study,the value range of a correction coefficient Rmin different type of holding strata under the pier bottom is accounted.The semi-empirical method can be formed by the tangent modulus being used in the layer-wise summation method to compute the foundation settlements.This paper provides a new reference for settlement calculation in deep pile foundation.
作者
王金淑
吴光
潘岳
姜永杰
何刘
Wang Jinshu;Wu Guang;Pan Yue;Jiang Yongjie;He Liu(School of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 610031,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2019年第S01期92-99,共8页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金(41602293).
作者简介
王金淑(1990—),女,河南新乡人,博士,主要从事岩土工程、地下工程等领域的科研工作。E-mail:jinshuwang@my.swjtu.edu.cn
