土钉结构支护基坑数值研究分析  

Numerical Study and Analysis of Soil Nail Structure Supporting Foundation Pit

作　　者：冯环[1] 梁冠军[1] 李策 FENG Huan;LIANG Guan-jun;LI Ce(School of Civil Engineering,Chuzhou Vocational and Technical College,Chuzhou 239000,Anhui;College of Resources and Environmental Engineering,Anhui University,Hefei 230601,Anhui)

机构地区：[1]滁州职业技术学院建筑工程学院,安徽滁州239000 [2]安徽大学资源与环境工程学院,安徽合肥230601

出　　处：《陇东学院学报》2025年第2期62-66,共5页Journal of Longdong University

基　　金：教育部高等学校科学研究发展中心专项课题“校企协同开发建筑工程技术专业群虚拟仿真实训资源的应用研究”(ZJXF2022080);安徽省省级培育项目“建筑技术虚拟仿真实训基地”(2022TZPY050)。

摘　　要：在粉土等特殊地质条件下,基坑容易发生失稳和严重变形,因此采用复合土钉支护对粉土基坑进行支护。为进一步研究复合土钉支护效果,对某小学地库复合土钉支护结构进行了研究,探讨复合土钉支护对粉土基坑的影响。结果表明基坑开挖深度对其稳定性有显著影响。基坑外土体呈抛物线状,土体抬升主要发生在底部。基坑侧壁土体水平位移呈“体腹”形式。此外,土钉的轴向力中部较大,两端较小,呈纺锤形;且其水平位移与土钉倾角、土钉间距呈显著正相关,与搅拌桩嵌体直径、土钉深度呈显著负相关。土钉的倾斜度应小于30°,预应力值不超过20kN。搅拌桩直径应小于1.5m;当搅拌桩埋深超过临界深度时,搅拌桩对水平位移的限制作用不显著。Under geological conditions such as chalk soil,the foundation pit is prone to instability and severe deformation,so composite soil nail support is used to support the chalk soil foundation pit.In order to study the effect of composite soil nail support,the composite soil nail support structure of an elementary school basement was investigated to explore the effect of composite soil nail support on the foundation pit of chalk soil.The results show that the pit excavation depth has a significant effect on its stability.The soil body outside the foundation pit is parabolic,and soil lifting mainly occurs at the bottom.The horizontal displacement of the soil body on the side walls of the pit was in the form of“body belly”.In addition,the axial force of soil nails is larger in the middle and smaller at both ends,which is spindle-shaped.And its horizontal displacement and soil nail inclination angle,soil nail spacing is positively correlated,and mixing pile embedded body diameter,soil nail depth is negatively correlated.The inclination of soil nails should be less than 30°,and the value of prestress should not exceed 20 kN.The diameter of stirred piles should be less than 1.5 m;when the embedment depth of stirred piles exceeds the critical depth,the limiting effect of stirred piles on horizontal displacement is not significant.

关 键 词：地库 土钉结构 基坑支护 数值研究 

分 类 号：TU753[建筑科学—建筑技术科学]