摘要
解析降水及桩侧地面等效堆载作用下,桩周不同区域土体有效应力增量分布的异同,用规范提供的解析式和数值方法研究降水与等效堆载时单桩侧摩阻力特性的差异,结果表明规范给出的负摩阻力解析式属极限分析法,在桩土相对位移较小时结果偏大,依照解析法进行桩基设计偏于安全。数值法得到的侧摩阻力曲线呈明显的三段式,而解析法得到的侧摩阻力曲线存在突变,中性点处侧摩阻力不为0,与实际显然不符。
The differences and similarities of soil effective stress increment distribution in different regions around pile is analyzed theoretically, which is respectively under the action of dewatering and pile-side equivalent surcharge loading. Then through the analytical formulas provided by specification and numerical method, the skin friction characteristics separately subjected to dewatering and pile-side surcharge loading are comparatively studied. Since the negative skin friction analytical formula given by specification belongs to limit analysis essentially, when the pile-soil relative displacement is smaller, the calculation result will be too large, and the pile foundation design directly according to analytical method seems somewhat safe. The curve of skin friction by numerical method appears a three-stage form, but there exists a sudden change in the curve obtained through analytical method;moreover the side friction at neutral point is not zero, which is obviously not match with the actual.
作者
原华
李临庆
YUAN Hua;LI Lin-qing(Institute of Geotechnical and Rail Transport Engineering,Henan University,475004,Kaifeng,He'nan,China;Laboratory for Recycled and Functional Building Materials,Henan University,475004,Kaifeng,He'nan,China;Luohe Municipal Engineering Design Institute Co.,Ltd.,462000,Luohe,He'nan,China)
出处
《建筑技术》
2019年第2期146-149,共4页
Architecture Technology
基金
河南省基础与前沿技术研究计划项目(142300410290)
河南省教育厅科学技术研究重点项目(14A560018)
关键词
降水
堆载
负摩阻力
有效应力增量
桩基设计
dewatering
surcharge loading
negative skin friction
effective stress increment
pile foundation design
