叠层隧道基坑回填过程中底层隧道响应分析  

Response analysis of surrounding soil and tunnel during backfilling of laminated tunnel

作　　者：吴佳欢 WU Jiahuan(China Railway 12th Bureau Group Co.,Ltd.,Taiyuan 030024,China)

机构地区：[1]中铁十二局集团有限公司,山西太原030024

出　　处：《四川建材》2025年第3期144-147,共4页Sichuan Building Materials

摘　　要：为了研究采用明挖法叠层隧道基坑大范围回填过程中对底层隧道响应分析,一方面,隧道基坑回填工程中会对基坑周围土体产生形变,另一方面,会对底部叠层隧道的内力与位移产生影响。因此,以昌北机场一号隧道某段基坑回填工程为背景,通过利用数值模拟软件(PLAXIS3D)对回填过程进行全精细化模拟,同时考虑到回填过程中土体内部土钉拔出情况研究对底层隧道响应分析,结果表明,回填高度对底部隧道内力与位移的影响规律,可以采用一元线性函数描述回填高度对底部隧道内力与位移的变化规律,最大主应力值出现在矩形隧道拱顶外侧,最大竖直位移出现在右侧外墙。总体来看,基坑回填过程中底部隧道结构内力与变形都处于相对安全的范围之内,可为相类似重叠隧道的回填设计与施工提供参考。In order to study the response analysis to the bottom tunnel in the process of large-scale backfilling in the pit of laminated tunnel with open-cut method,on the one hand,the soil around the foundation pit will be deformed in the backfilling engineering of tunnel foundation pit,and on the other hand,the internal force and displacement of the bottom laminated tunnel will be affected.Therefore,based on the foundation pit backfilling project of a section of Changbei Airport No.1 Tunnel,this paper uses numerical simulation software(PLAXIS3D)to conduct a fully fine simulation of the backfilling process.At the same time,considering the withdrawal of soil nails inside the soil during the backfilling process,the response analysis of the underlying tunnel is studied.The effect of backfill height on the internal force and displacement of the tunnel at the bottom can be described by using a linear function of one variable.The maximum principal stress value appears on the outside of the arch of the rectangular tunnel and the maximum vertical displacement appears on the right external wall.In general,the internal force and deformation of the bottom tunnel structure in the process of foundation pit backfill are within the relatively safe range,so this study can provide reference for the backfill design and construction of similar overlapping tunnels.

关 键 词：基坑回填 数值模拟 隧道响应 

分 类 号：U451[建筑科学—桥梁与隧道工程]