混凝土内支撑尺寸效应对基坑支护的影响分析  

Analysis of the impact of scale effect of concrete inner support on foundation pit support

作　　者：潘骏[1] 黄广龙[2] 赵升峰[3] 

机构地区：[1]芜湖职业技术学院,安徽芜湖241000 [2]南京工业大学交通学院,江苏南京210009 [3]南京市测绘勘察研究院有限公司,江苏南京210019

出　　处：《合肥工业大学学报（自然科学版）》2015年第4期520-524,563,共6页Journal of Hefei University of Technology：Natural Science

基　　金：南京市建设行业科研计划资助项目(201207)

摘　　要：文章基于南京河西某工程的地质模型,进行了不同长度支撑约束下基坑支护桩位移、弯矩、剪力以及支撑轴力的变化情况对比分析。结果表明:随着支撑长度的增加,第1道支撑轴力均减小,且减幅较小,下部支撑轴力均增大;随着支撑长度的增加,挖深6.0 m时支护桩变形和内力变化均较小;挖深10.0 m和14.0m时,支护桩弯矩均增大,正剪力均减小,负剪力均增大。Based on the geological model of a project in Hexi,Nanjing City,the changes of the displacement,bending moment,shear force and axial force of support of the foundation pit supporting piles under the constraints of different supporting length are comparatively analyzed.The result shows that with the increase of the supporting length,the first axial forces of support reduce slightly,while the lower axial forces of support increase.With the increase of the supporting length,the deformation and the internal force change of the supporting piles are relatively small when the foundation is excavated to 6.0m,while the bending moments increase,the positive shear forces decrease and the negative shear forces increase when excavated to 10.0mand 14.0m.

关 键 词：支撑刚度 混凝土内支撑 尺寸效应 桩身位移 桩身内力 支撑轴力 

分 类 号：TU47[建筑科学—结构工程]