黄土地区深基坑桩锚支护结构内力及变形分析  

Analysis of internal forces and deformation of the pre-stressd anchor cable bitten piles in deep foundation pit in loess area

作　　者：马亮 张繁祥 麻升刚 Ma Liang;Zhang Fanxiang;Ma Shenggang(Gansu Academy of Building Research(Group)Co.,Ltd.,Lanzhou Gansu 730070,China;Gansu Construction Engineering Inspection and Testing Certification Center Co.,Ltd.,Lanzhou Gansu 730070,China)

机构地区：[1]甘肃省建筑科学研究院(集团)有限公司,甘肃兰州730070 [2]甘肃省建设工程检验检测认证中心有限公司,甘肃兰州730070

出　　处：《山西建筑》2025年第8期83-87,共5页Shanxi Architecture

基　　金：甘肃省住房和城乡建设厅2019年建设科技项目计划:BIM技术在兰州市区复杂环境深大基坑中的研究与应用(项目编号:JK2019-06)。

摘　　要：在黄土地区深基坑开挖是建设工程的重点,为了研究黄土地区深基坑不同开挖阶段桩锚索支护结构内力及变形规律,以实际工程为基础对支护桩桩身钢筋应力、预应力锚索轴向拉力、桩身变形及桩顶位移进行了监测,结合监测数据对深基坑开挖过程中桩锚支护结构位移与内力的动态变化规律和特点进行了全面分析。结果表明:深基坑开挖过程中,空间效应对基坑开挖初期支护结构变形影响较小,对基坑开挖后期支护结构变形影响相对较为明显;预应力锚索的设置对支护桩桩身内力分布影响显著,最大值出现位置逐渐下移,一般在基坑底部内侧附近出现,且其对基坑支护结构内力和变形发展起到很好的控制作用。Excavation of deep foundation pits in loess area is a key focus of construction projects.In order to study the internal forces and deformation laws of pile anchor support structures in different excavation stages of deep foundation pits in loess areas,based on actual engineering,the stress of the steel bars in the supporting pile body,the axial tension of the pre-stressed anchor cable,the deformation of the pile body,and the displacement of the pile top were monitored.Combined with the monitoring data,a comprehensive analysis was conducted on the dynamic changes and characteristics of the displacement and internal forces of the pile anchor support structure during the excavation process of deep foundation pits.The research results indicate that during the excavation process of deep foundation pits,spatial effects have a relatively small impact on the deformation of the support structure in the initial stage of excavation,but have a relatively significant impact on the deformation of the support structure in the later stage of excavation;The setting of pre-stressed anchor cables has a significant impact on the internal force distribution of the supporting pile body.The maximum internal force value gradually moves downwards and generally appears near the bottom of the foundation pit.The pre-stressed anchor cables play a good role in controlling the internal forces and deformation development of foundation pit support structures.

关 键 词：黄土地区 深基坑 咬合桩 预应力锚索 内力 变形 

分 类 号：TU473.2[建筑科学—结构工程]