均匀地基中的单桩竖向抗压刚度  

Vertical compressive stiffness of single pile in the uniform subsoil

作　　者：张武 高炳琪 姚晓旭 闫建 Zhang Wu;Gao Bingqi;Yao Xiaoxu;Yan Jian(China Academy of Building Research,Beijing 100013,China)

机构地区：[1]中国建筑科学研究院有限公司,北京100013

出　　处：《建筑科学》2019年第3期29-37,共9页Building Science

摘　　要：本文基于单桩竖向受压性状分析的传递函数法和剪切位移法,推导了均匀地基中单桩竖向抗压刚度的解析表达式,说明均匀地基中单桩竖向抗压刚度是确定地基条件下单桩本身固有的力学性质,取决于桩身刚度与桩周土层的地基弹性参数,并以工程实例对比了单桩竖向抗压刚度理论值与静载试验实测值。分析了桩长、桩径、桩身材料模量、桩侧土弹性模量、泊松比及桩端地基的基床系数对单桩竖向抗压刚度的影响。讨论了不同地基弹性参数及单桩几何尺寸与材料时提高单桩竖向抗压刚度、减少单桩沉降的工程措施。Based on the load transfer method and shear displacement method for the analysis of vertical compression behavior of single pile,the analytical expression of vertical compression stiffness of single pile in uniform foundation is derived in this paper.It is shown that the vertical compressive stiffness of single pile in uniform subsoil is the inherent mechanical property of single pile,which depends on the stiffness of pile body and the elastic parameters of soil layer around pile.The theoretical value of vertical compressive stiffness of single pile and the measured value of static load test are compared with engineering examples.The influence of pile length,pile diameter,pile material modulus,pile side soil elastic modulus,Poisson’s ratio and coefficient of subgrade reaction of pile tip foundation on the vertical compressive rigidity of single pile is analyzed.The engineering measures are discussed in order to improve the vertical compressive rigidity of single pile and reduce the settlement of single pile when the elastic parameters of different foundation and the geometrical dimensions and materials of single pile are different.

关 键 词：均匀地基 抗压刚度 传递函数法 剪切位移法 灌注桩后注浆 静载试验 

分 类 号：TU473.1[建筑科学—结构工程]