摘要
为探讨陡坡段刚性桩的水平承载力计算方法,基于现有刚性桩承载机理及变形分析研究成果,假定极限状态下的刚性桩桩周地基水平反力分布形式(三角形、矩形、梯形或者非线性曲线形)。根据刚性桩桩顶水平荷载指向下坡方向及上坡方向2种工况,提出对应的边坡破坏模式。基于极限分析下限定理,推导出2种荷载方向下的刚性桩极限地基水平反力,并通过刚性桩静力平衡条件计算其极限水平承载力。引入现场试验验证本文理论分析方法的合理性。研究结果表明:计算刚性桩极限承载力时应考虑边坡破坏的影响;自由段较小的刚性桩水平承载力下限解更接近工程实际。以上分析可为陡坡段桩基设计提供参考,具有一定的理论及工程实用价值。
This paper was presented to evaluate the lateral bearing capacity of rigid piles in inclined ground.The distributions of lateral subgrade reactions around rigid piles(triangle,rectangle,trapezoid,or non-liner curve)under ultimate lateral loads atop piles were assumed on the basis of existing research for the bearing mechanism and deformation analysis of rigid piles.Two different slope failure modes under lateral downhill(or uphill)loads atop the rigid pile were proposed.Then,the subgrade reactions were derived on the basis of the lower limit theorem of limit analysis and lateral bearing capacity of rigid piles was predicted based on the static equilibrium condition.The proposed method is verified by several field tests,the results reveal that the influence of slope failure should be taken into account in evaluating the ultimate bearing capacity of rigid piles,and the lower-bound analysis of the bearing capacity of rigid pile with short free segment is closer to engineering practice.The aforementioned analyses could provide references for pile foundation designs in inclined ground,and are of theoretical and engineering value.
作者
杨博铭
YANG Boming(Design Institute of Hunan University,Changsha 410082,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2020年第9期2243-2250,共8页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51478178)。
关键词
桥梁工程
水平承载力
下限解
刚性桩
边坡
bridge engineering
lateral bearing capacity
lower-bound analysis
rigid pile
slope
