摘要
基于PLAXIS 3D建立地铁隧道明挖段深基坑分步开挖和支护的三维数值模型,模拟计算得到的基坑坑壁水平位移和地表沉降曲线符合一般规律,且最大值在相关建筑规范允许范围之内。采用变量分析的方法改变基坑支护设计参数,对不同土钉长度、土钉间距、土钉倾角及边坡坡比的支护设计方案进行模拟,获得坑壁水平位移及周围地表沉降情况所受变化参数的影响结果,结果表明,四者影响下基坑坑壁水平位移及周边沉降的趋势曲线几乎一致,对比基坑最大变形值,得到最佳优化设计方案。
Based on PLAXIS 3D,a three-dimensional numerical model of step-by-step excavation and support of deep foundation pit in open-cut section of subway tunnel is established.The horizontal displacement of foundation pit wall and surface settlement curve obtained by simulation calculation conform to the general law,and the maximum value is within the allowable range of relevant building codes.The variable analysis method is used to change the design parameters of foundation pit support.The support design schemes with different soil nail length,soil nail spacing,soil nail inclination angle and slope ratio are simulated to obtain the horizontal displacement of the pit wall and the surrounding surface settlement.The results show that the trend curves of the horizontal displacement of the pit wall and the surrounding settlement are almost the same under the influence of the four factors.The optimal design scheme is obtained by comparing the maximum deformation value of the foundation pit.
作者
杜立成
DU Licheng(China Railway 12th Bureau Group Co.,Ltd.,Xi'an 710021,China)
出处
《四川建材》
2025年第8期132-135,共4页
Sichuan Building Materials
关键词
基坑工程
土钉支护
地表变形
方案优化
foundation pit engineering
soil nailing support
surface deformation
scheme optimization
