考虑软弱夹层的土钉墙设计参数对基坑变形与稳定性影响分析  

Influence Analysis of Soil Nail Design Parameters on Foundation Pit Deformation and Stability Considering the Weak Interlayer

作　　者：曹程明 时轶磊 龙照 闫文进 CAO Chengming;SHI Yilei;LONG Zhao;YAN Wenjin(Gansu CSCEC Municipal Engineering Investigation and Design Institute Co.,Ltd.,Lanzhou 730000,China;CSCEC Aecom Consultants Co.,Ltd.,Lanzhou 730000,China)

机构地区：[1]甘肃中建市政工程勘察设计研究院有限公司,甘肃兰州730000 [2]中国市政工程西北设计研究院有限公司,甘肃兰州730000

出　　处：《甘肃科学学报》2022年第6期85-90,共6页Journal of Gansu Sciences

基　　金：甘肃省建设科技攻关计划项目(JK2019-01);甘肃省科技计划资助(20JR10RA570)。

摘　　要：土钉设计参数直接影响基坑的变形与稳定性,对于局部存在软弱夹层的基坑工程,土钉参数对基坑稳定性的影响更为明显。为分析局部存在软弱夹层时不同土钉参数对基坑稳定性的影响,采用水平条分法建立土钉墙计算模型,并进行稳定性计算。结合工程实例,采用PLAXIS 3D软件建立不同土钉参数的三维有限元模型,分析土钉长度、水平间距与竖向间距对基坑稳定性与变形的影响。结果表明,对于存在软弱夹层的基坑工程,水平位移在软弱夹层处产生突变;土钉长度以及设置位置对基坑变形具有明显的控制作用,并使基坑稳定性安全系数提高;土钉的水平间距与竖向间距减小均能提高基坑的稳定性,且竖向间距影响更明显。研究结果可为局部存在软弱夹层的基坑工程土钉墙优化设计提供一定的参考。The design parameters of soil nailing directly affect the stability and deformation of foundation pit.For the foundation pit engineering with weak interlayer, the influence of soil nail parameters on the foundation pit stability was more obvious.In order to analyze the influence of different soil nailing parameters on the stability of foundation pit under the condition of weak interlayer, the horizontal strip method was adopted to establish the calculation model and the stability was calculated.Then combining with engineering examples, PLAXIS 3 D software was used to establish finite element models, and the influence of length, horizontal and vertical spacing of soil nails on foundation pit deformation and safety factor were analyzed.The results showed that for the foundation pit with weak interlayer, the horizontal displacement produces mutation at the weak interlayer.The length and location of soil nails can control the deformation of the foundation pit and improve the stability of the factor of safety.Both the horizontal and vertical spacing of soil nails can improve the stability of the foundation pit, and the vertical spacing has more obvious influence.The results could provide some reference for the optimization design of soil nails in foundation pit engineering with weak interlayer.

关 键 词：基坑 土钉长度 水平间距 竖向间距 有限元分析 

分 类 号：TU473[建筑科学—结构工程]