层状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 姚晓旭 高炳琪 闫建 张波 Zhang Wu;Yao Xiaoxu;Gao Bingqi;Yan Jian;Zhang Bo(China Academy of Beijing Research,Beijing 100013,China)

机构地区：[1]中国建筑科学研究院有限公司

出　　处：《建筑科学》2019年第9期39-45,共7页Building Science

摘　　要：本文推导了层状地基中单桩竖向抗压刚度的解析表达式。说明在确定地基条件下,层状地基中单桩竖向抗压刚度是单桩本身固有的力学性质,并取决于其桩身刚度与桩周土层的地基弹性参数。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。分析了桩侧土弹性模量、桩端地基的基床系数对单桩竖向抗压刚度的影响。讨论了提高层状地基中单桩竖向抗压刚度、减少单桩沉降的工程措施。The analytical expressions of vertical compressive stiffness of single pile in layered foundation are derived in this paper.It is indicated that the vertical compressive stiffness of single pile foundation in the pile foundation is determined under the foundation condition,and the mechanical properties of the single pile itself depend on the elastic parameters of foundation stiffness and soil layer.The theoretical value of single pile vertical compression stiffness and static load test are compared with engineering examples.The influence of soil elastic modulus and foundation bed coefficient on vertical compressive stiffness of single pile is analyzed.The engineering measures to increase the vertical compressive stiffness of single pile in layered foundation and reduce single pile settlement are discussed.

关 键 词：层状地基 抗压刚度 分段递推法 灌注桩后注浆 静载试验 

分 类 号：TU473.1[建筑科学—结构工程]