块石土地层浅埋双线隧道开挖进尺分析  

ANALYSIS OF EXCAVATION ADVANCE IN SHALLOW-BURIED TWIN-LINE TUNNELS WITHIN BLOCK STONE SOIL STRATA

作　　者：廖玉辉 LIAO Yuhui(Chongqing Three Gorges University,Chongqing 404100,China)

机构地区：[1]重庆三峡学院,重庆404100

出　　处：《低温建筑技术》2025年第3期138-142,共5页Low Temperature Architecture Technology

基　　金：重庆市三峡水库岸坡与工程结构灾变防控工程技术研究中心开放基金资助项目(SXAPGC23XC09);重庆市重庆三峡学院研究生科研创新项目(YJSKY24050)。

摘　　要：为研究城市浅埋双线隧道穿越块石土地层且土地层含大量孤石条件下,不同开挖进尺对地表沉降的影响,文中以重庆市万州区北山隧道为工程依托,结合现场实际监测数据和MIDAS/GTSNX有限元软件,研究0.5、1、2 m3种不同开挖进尺对地表横纵方向沉降的影响。结果表明3种不同开挖进尺地表沉降峰值位于双线隧道轴线上方,其数值分别为63.49、62.59、61.15 mm;右线隧道核心土开挖后地表沉降增量分别为28.33、27.60、29.60 mm;地表纵向沉降曲线变形速率呈现先增大后减小,再增大最后减小的趋势,隧道开挖面穿过监测点20 m左右时,地表沉降变形稳定。3种开挖进尺完成后横纵向沉降规律相似,最后将实测结果与数值模拟结果对比发现数值差异较小且沉降规律相同,此结果可为类似地层施工提供参考。To investigate the impact of different excavation advances on surface settlement when an urban shallow-buried twin-line tunnel passes through a block stone soil stratum with numerous boulders,this study is based on the Beishan tunnel project in Wanzhou district,Chongqing.By integrating field monitoring data with MIDAS/GTS NX finite element software,the study analyzes the effects of excavation advances(0.5,1 and 2 m)on transverse and longitudinal surface settlement.The results show that the peak surface settlement for all three excavation advances occurs directly above the twin-line tunnel axis,with values of 63.49,62.59 and 61.15 mm,respectively.After the excavation of the right tunnel core soil,the surface settlement increments are 28.33,27.60 and 29.60 mm.The longitudinal settlement deformation rate follows a pattern of initially increasing,then decreasing,increasing again,and finally stabilizing when the tunnel face advances approximately 20 m past the monitoring point.After completing the three excavation advances,the transverse and longitudinal settlement trends are similar.A comparison between measured data and numerical simulation results reveals minimal discrepancies,confirming a consistent settlement pattern.These findings provide valuable references for tunnel construction in similar geological conditions.

关 键 词：浅埋隧道 不同开挖进尺 地表沉降变形 

分 类 号：TU449[建筑科学—岩土工程]