摘要
以石家庄地铁3号线东里站轨排井段深基坑施工为研究背景,运用FLAC3D软件对桩锚混合围护结构体系在深基坑中的受力演化规律进行模拟研究。从受力方面对桩锚混合围护结构在深基坑应用中的演化规律进行定量分析,发现支护体系受力随基坑开挖深度的增加而增加;进一步对桩锚围护结构中的锚索轴力损失机理进行探究,得到入射角度在5°~30°范围内轴力损失较小,增加预加轴力和自由段长度均可适当增加锚索自由段轴力;通过对补偿张拉和超张拉两种锚索预应力补偿措施进行分析,确定最佳锚索预应力补偿措施。
Taking the construction of deep foundation pit of the mine drainage section of Dongli Station of Shijiazhuang Metro Line 3 as the research background,the simulation study on the force evolution law of pile-anchor mixed retaining structure system in deep foundation pit using FLAC3 D software was conducted.The evolutionary law of pile-anchor mixed enclosure structure in deep foundation pit was quantitatively analyzed from the aspect of stress.It was found that the force of supporting system increased with the increase of excavation depth of foundation pit.Then the mechanism of axial force loss of anchor cable in pile-anchor enclosure structure was further studied,it was found that the axial force loss was less in the range of 5°~30°and the axial force of the free section of the anchor cable could be increased appropriately by increasing the axial force and the length of the free section.Besides,compensation measures of compensate tension and super tension were analyzed to determine the best anchor stress compensation measures.
作者
张志
朱正国
李振源
安海涛
Zhang Zhi;Zhu Zhengguo;Li Zhenyuan;An Haitao(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Hebei Technology and Innovation Center on Safe and Efficient Mining of Metal Mines,Shijiazhuang 050043,China)
出处
《石家庄铁道大学学报（自然科学版）》
2020年第2期33-38,45,共7页
Journal of Shijiazhuang Tiedao University(Natural Science Edition)
基金
国家自然科学基金(51978424)
河北省高校百名创新人才支持计划(Ⅲ)(SLRC2017054)
河北省人才工程培养经费资助项目(A201802005)。
关键词
深基坑
桩锚支护结构
预应力损失
补偿措施
deep foundation pit
pile-anchor structure
prestress loss
compensation measures
