摘要
景德镇某基坑地层主要以卵石、灰岩为主,为满足施工作业空间和施工进度要求,原设计方案采用桩锚式围护结构。在基坑的开挖过程中,围护结构出现较大变形,威胁工程安全,需采取相关措施进行防护。对围护结构发生较大变形的可能原因进行初步分析,结果表明:围护结构发生较大变形是预应力锚索失效导致。提出施作局部主体结构加临时内撑的解决方案,并通过有限元数值方法,模拟原有围护桩及改进方案后支护效果。研究表明:采用改进方案,围护桩变形及弯矩得到有效控制,满足相应监控量测预警值要求,可为相关工程提供借鉴。
The stratum of a certain foundation pit in Jingdezhen is mainly pebble and limestone.In order to meet the requirements of construction operation space and construction schedule,the original design plan adopts a pile-anchored enclosure structure.During the excavation of the foundation pit,the enclosure structure was deformed greatly,threatening the safety of the project,and relevant measures need to be taken for protection.The possible causes of the larger deformation of the retaining structure,and the results showed that the larger deformation of the retaining structure was caused by the failure of the prestressed anchor cable.In view of the current situation,a solution of constructing a local main structure with temporary internal bracing was proposed,and the finite element numerical method was used to simulate the support effect of the original retaining pile and the improved plan.The research showed that the improved scheme could effectively control the deformation and bending moment of the retaining pile,and met the requirements of the corresponding monitoring and measuring early warning value,which could provide reference for related projects.
作者
贺斯进
赵一行
张慧鹏
饶凯
袁聪聪
石钰锋
HE Sijin;ZHAO Yixing;ZHANG Huipeng;RAO Kai;YUAN Congcong;SHI Yufeng(Nanchang Rail Transit Group Co..Ltd.,Nanchang 330013,Jiangxi,China;Jiangxi Key Laboratory of Geotechnical Engineering Infrastructure Safety and Control,East China Jiaotong University,Nanchang 330013,Jjiangxi,China)
出处
《隧道与地下工程灾害防治》
2020年第4期59-64,共6页
Hazard Control in Tunnelling and Underground Engineering
基金
国家地区科学基金资助项目(51768020)
江西省自然科学基金资助项目(20192BAB206043)。
关键词
桩锚支护
较大变形
有限元
内支撑
位移
pile-anchor support
large deformation
finite element
internal support
displacement
