公路双连拱隧道施工过程中中隔墙的变形及稳定性  

Deformation and Stability of Mid-board in Process of Highway Double-arch Tunnel Construction

作　　者：夏永旭[1] 王文正[1] 胡庆安[1] 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《中国公路学报》2007年第5期83-88,共6页China Journal of Highway and Transport

基　　金：陕西省交通科技项目(03-07K)

摘　　要：应用线弹性平面应变和空间模型,考虑了施工中可能出现的各种不利因素,对双连拱隧道三导洞法施工时,中隔墙的变形和稳定性进行了详细的数值模拟分析。结果表明:右洞(先开挖洞)开挖对中隔墙的影响约在开挖面前后1.5B(B为右洞开挖宽度)的范围,左右两洞的开挖面间距以2.5B^3.0B为宜;右洞施工时,中隔墙产生整体向左的偏转,墙身中部向左侧鼓出,基部右趾向上抬起;同时在纵断面方向,产生向左的横向弯曲;随着左洞施工推进,中隔墙的偏转得到纠正,基部右趾回落,横向弯曲逐渐恢复;在整个施工过程中,中隔墙顶部和左侧的密实回填,对抑制中隔墙的变形和降低中隔墙的内力十分有效。Applying plane strain and three dimension models, considered disadvantaged factors in process of construction, the deformation and stability of the mid-board of double-arch tunnel were analyzed by numerical method. Results show that the influence area for the mid-board as a result of the construction of right tunnel is 1.5B （B is the excavation width of right tunnel） interval excavation face. The interval between the right and left tunnels should be less than 2.5B^3.0B. During the construction of right tunnel, the mid-partition behind the excavating face deflects to the left side as a whole; middle part of the mid-board bulges to the left and the right toe rises. Along with the progress of construction of the left tunnel, the bulge is corrected , the rise is debased and the deflection comes back. In the construction of double-arch tunnel, the top of midboard and the foot of left tunnel at the side of mid-board must be reinforcing backfilled which are very efficacious to prevent deformation of the mid-board.

关 键 词：隧道工程 双连拱隧道 数值分析 中隔墙 三导洞法 变形 稳定性 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]