摘要
桩侧负摩阻力问题广泛存在于桩基工程中,由于湿陷性黄土浸水沉降过程缓慢,桩基负摩阻力具有明显的时效性.笔者首先探讨了黄土的湿陷以及负摩阻力产生的机理,重点研究了桩和土的相对位移与时间的关系,引入荷载传递模型,推导出桩侧负摩阻力与时间的关系.通过计算表明,单桩的负摩阻力随时间的增长而增大,但增长速率逐渐减小,最终负摩阻力将趋于一个稳定值.该计算结果能够很好的体现湿陷性黄土中单桩负摩阻力的时效性,并对湿陷性黄土中桩基础的施工具有很好的指导意义.
The problem of negative skin friction on pile side is widely existed in pile foundation engineering. Due to the slow process of water infiltration and settlement of collapsible loess, negative skin friction on pile foundation has obvious timeliness.Firstly, the mechanism of the loess’ s subsidence and negative friction resistance is discussed, and the relationship between the relative displacement and time of pile and soil is studied. The calculation shows that the negative friction resistance of single pile increases with the increase of time, but the increase rate decreases gradually, and the negative friction resistance will reach a stable value eventually. The calculation results can well reflect the timeliness of negative friction resistance of single pile in collapsible loess and have a good guiding significance for the construction of pile foundation in collapsible loess.
作者
杨逾
孔美婷
崔雄飞
YANG Yu;KONG Meiting;CUI Xiongfei(School of civil engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China;No.5 Engineering Company Ltd. of CCCC First Harbor Engineering Company Ltd., Qinhuangdao 066000, Hebei, China)
出处
《力学季刊》
CSCD
北大核心
2019年第2期384-391,共8页
Chinese Quarterly of Mechanics
基金
国家重点研发计划(2018YFC604705)
国家自然科学基金(51774167)
辽宁省重点实验室课题(LJZS002)
关键词
湿陷性
相对位移
沉降量
负摩阻力
时间效应
collapsibility
relative displacement
settlement
negative skin
time effect
作者简介
杨逾,教授,博士.研究方向:地下工程.Email:yangyu9300@163.com;通信作者:孔美婷,硕士生.研究方向:岩土工程设计与研究.Email:2449001256@qq.com.
