坑中坑开挖对桩锚支护基坑稳定性与变形的影响

发布时间：2018-02-12 04:27

本文关键词： 深基坑工程坑中坑桩锚支护结构稳定性与变形数值模拟　出处：《地下空间与工程学报》2016年S2期 　论文类型：期刊论文

【摘要】：桩锚支护结构是深基坑常用的支护形式之一,在工程中已获得广泛应用。深基坑开挖后再次开挖内坑会对基坑整体稳定性与变形造成不利的影响。依据合肥市滨湖新区恒大中心深基坑为原型,基于Flac3d数值模拟,分析了坑趾系数、内外坑深度比、外坑支护结构插入比对基坑整体稳定性及变形的影响。分析结果表明:该基坑坑中坑支护设计是可靠和安全的;内坑施工对基坑整体稳定性及围护结构最大变形的影响随坑趾系数、外坑支护结构插入比的增大而减小,随内外坑深度比的增大而增大;内外坑深度比和坑趾系数的变化对基坑整体稳定性及围护结构最大变形的影响皆敏感,且对围护结构最大变形的影响更为显著。
[Abstract]:Pile-anchor support structure is one of the common support forms in deep foundation pit. It has been widely used in engineering. Excavation of inner pit after excavation of deep foundation pit will adversely affect the overall stability and deformation of foundation pit. According to the prototype of Evergrande Center Foundation Pit in Binhu New District of Hefei City, the numerical simulation is based on Flac3d. The influence of pit toe coefficient, depth ratio of inside and outside pit and the ratio of external pit support structure to the whole stability and deformation of foundation pit are analyzed. The results show that the pit support design in the pit is reliable and safe. The influence of internal pit construction on the overall stability of foundation pit and the maximum deformation of retaining structure decreases with the increase of pit toe coefficient, the insertion ratio of external pit support structure, and increases with the increase of depth ratio of inside and outside pit. The change of the depth ratio and the coefficient of pit toe are sensitive to the overall stability of foundation pit and the maximum deformation of the retaining structure, and the influence on the maximum deformation of the retaining structure is more significant.
【作者单位】：中铁建设集团有限公司;武汉理工大学土木工程与建筑学院;
【基金】：中铁建设集团科技项目(LX13-14)
【分类号】：TU753

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