摘要
在工程建设领域,经常需要把条形基础设置在临坡地基上,但在现行成果中,对临坡地基极限承载力的确定没有给出具体计算方法.建立双侧非对称滑移破坏模型,将坡后土体强度进行折减,用发挥系数m来表征其强度.基于极限平衡法和叠加原理,求得三个承载力系数的表达式.基于极限分析法原理,推导出临坡地基极限承载力上限解.采用离心模型试验对理论分析结果进行验证,并就条形基础作用下的临坡地基变形破坏特征以及基底接触条件、基础位置、边坡高度等诸多因素对临坡地基极限承载力的影响开展研究.研究表明:发挥系数m随相对坡顶距呈规律性变化;其他条件均相同时,基础宽度越大,临坡地基极限承载力越高;基底接触条件对于临坡地基极限承载力具有显著影响;离心模型试验结果与理论计算结果较为吻合,总体误差在10%以内.
In the field of engineering construction,foundations were often placed adjacent to slopes.In the present research work,the evaluation of the maximum bearing capacity of slope foundations lacked a sufficiently accurate method.A bilateral asymmetry slip failure model for ground foundation adjacent to slope was developed,the strength of soil on the side of flat ground was reduced and this is characterized by a mobilization factor.Base on limit equilibrium method and superposition principle,three bearing capacity factors were expressed.The upper bound bearing capacity for ground foundation adjacent to slope was deduced based on limit analysis approach.Centrifugal model tests were used to verify the theoretical analysis results;and the deformation and failure characteristics of these foundations were studied.In addition,the influence of various factors such as the contact conditions of the foundation,the location of the foundation,and the height of slope on the maximum bearing capacity of these foundations was also studied.Research showed that,(1)The value of mobilization factor m varied regularly with the relative distance from the edge of slope.(2)As other conditions were constant,the larger value of foundation width,the higher value of the ultimate bearing capacity of theses foundations.(3)Roughness of foundation had a significant impact on the ultimate bearing capacity of ground foundation adjacent to slope.(4)Results from centrifugal model test were almost consistent with which from theoretical calculation,the overall error was within 10%.
作者
蒋洋
郭建坤
王晓谋
侯超群
JIANG Yang;GUO Jiankun;WANG Xiaomou;HOU Chaoqun(Faculty of Architecture and Civil Engineering,Huaiyin Institute of Technology,Huai'an 223001,China;School of Highway,Chang'an University,Xi'an 710064,China;School of Traffic and Transportation Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《郑州大学学报（工学版）》
CAS
北大核心
2019年第3期85-91,共7页
Journal of Zhengzhou University（Engineering Science）
基金
淮安市应用研究与科技攻关计划(工业)项目(HAG2015026)
江苏省住房与城乡建设厅指导项目(2015ZD50)
关键词
临坡地基
极限承载力
双侧非对称破坏模式
离心模型试验
影响因素
ground foundation adjacent to slope
the ultimate bearing capacity
bilateral asymmetry failure mode
centrifugal model test
influencing factors
