摘要
为了解斜桩的水平承载变形性状及荷载传递性状,本文在砂土地基中开展了2组斜桩的水平承载模型试验,研究了桩身倾角及长径比对斜桩水平承载力的影响,分析了水平荷载作用下斜桩桩身轴力、弯矩、剪力及摩阻力的分布特征.试验结果表明:桩长相同时,正斜桩的水平承载力最大,负斜桩的水平承载力最小,直桩的水平承载力居中.水平荷载作用下,正斜桩桩身全长受拉,负斜桩桩身上部区段受压,下部区段受拉,不论正斜桩还是负斜桩,桩身轴力最大值均在桩顶下一定深度的截面.承受相同的水平荷载时,正斜桩的弯矩最小,负斜桩的弯矩最大,直桩弯矩居中,桩较长时,桩身弯矩较小.正斜桩的剪力最小,直桩居中,负斜桩最大,不论正斜桩还是负斜桩,剪力最大值均在桩顶截面,桩顶下一定深度处还存在极值剪力.正负斜桩桩身上部区段均存在负摩阻力,下部区段为正摩阻力.
Two series of model tests were conducted to investigate the behaviors of single batter piles embedded in sand under horizontal load,the effect of inclined angle and pile length to shaft diameter ratio(L/D)on the lateral capacity,the axial force,the bending moment,the shear force and the skin friction of batter piles was analyzed.The results show that the horizontal bearing capacity of the positive inclined pile is the biggest;the negative inclined pile has the smallest capacity,while the vertical pile’s capacity falls in between the former and the latter.The horizontally loaded positive inclined piles will be tensioned over its full length,while compressed over upper segment and tensioned over lower segment for negative inclined piles.The maximum axial force,for either the positive or the negative batter piles doesn’t appear at pile head but at a position below the pile head.The bending moments induced in the vertical piles by horizontal load are bigger than that in the positive batter piles but smaller than that in the negative batter piles;and the longer the length of the pile,the smaller the bending moments.A maximum value and an extreme value of shear force will be caused on the pile head and a position below the pile head respectively for vertical piles as well as for batter piles.The shear force for the positive batter piles is the smallest while the biggest for the negative batter piles and the intermediate for the vertical ones.The horizontal load will cause negative skin friction on the upper shaft,irrespective of positive or negative battered.
作者
曹卫平
赵呈
葛欣
赵敏
CAO Weiping;ZHAO Cheng;GE Xin;ZHAO Min(School of Civil Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China;Shaanxi Key Lab.of Geotechnical&Underground Space Engineering,Xi′an 710055,China.3.China Railway ERJU 3st Engineering Co.Ltd.,Chengdu 610031,China;School of Civil and Architecture Engineering,Xi′an Technological University,Xi′an 710032,China)
出处
《西安建筑科技大学学报（自然科学版）》
北大核心
2020年第2期168-176,共9页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
陕西省自然科学基础研究计划一般项目(2019JM-006)。
关键词
斜桩
模型试验
桩身倾角
长径比
水平承载力
batter pile
model test
inclined angle
pile length to shaft diameter ratio
horizontal bearing capacity
