摘要
对于承受负摩阻力的桩基,桩顶和土表的承载一般存在先后的次序,但针对承载顺序对桩身负摩阻力影响的研究相对匮乏。通过开展不同加载顺序下砂土中单桩负摩阻力模型试验,测得了不同加载作用下桩身轴力、桩顶位移以及土体分层沉降。研究结果表明:砂土中加载顺序对桩基负摩阻力具有明显影响。先施加土表荷载的组次较先施加桩顶荷载的组次,桩身中性点位置更靠近桩底。先施加土表荷载后,桩顶荷载作用下的桩顶沉降明显小于先施加桩顶荷载的情况,而不同加载顺序下,土表荷载作用下的桩顶沉降的变化规律基本一致,且桩顶沉降增长随土面荷载趋缓。
As for piles under negative skin friction, there exists a sequence loaded on pile head and surcharge around piles.However, the influence of the loaded sequence on negative skin friction is less studied.Aiming at researching the influence of the loaded sequence, the indoor model tests for negative skin friction on single pile in sand were carried out.The axial force of pile shaft, settlement of pile top and each soil layer were measured.The results showed that the influences of the loaded sequence were obvious on the negative skin friction of the pile in sand.When the surcharge around piles were loaded first, the neutral plane were closer to piles tips.Settlement of piles loaded on surcharge around piles first were significantly smaller than that of piles loaded on the tops first.The pile head settlements under the action of surcharge load were basically identical with the different loaded sequence, and the increase amplitudes of pile head settlements slowed down gradually with the increasing of surcharge load around piles.
出处
《工业建筑》
CSCD
北大核心
2015年第6期98-102,86,共6页
Industrial Construction
基金
国家自然科学基金项目(51408185)
江苏省自然科学基金项目(BK20130843)
江苏省博士后科研资助计划项目(1302048B)
中国博士后科学基金资助项目(2014M561564)
重庆交通大学国家内河航道整治工程技术研究中心暨水利水运工程教育部重点实验室开放基金资助项目(SLK2013B01)
关键词
加载顺序
桩
负摩阻力
模型试验
中性点
下拉力
loaded sequence
pile
negative skin friction
model test
neutral plane
dragload
