循环进尺对大断面浅埋隧道稳定性的影响
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摘要
依托某高速公路大断面浅埋隧道工程,结合有限元数值分析方法,从围岩竖向位移、隧道净空收敛、支护结构内力、围岩塑性区四个角度对该隧道三台阶施工方法的合理循环进尺展开模拟分析。结果表明:循环进尺长度大于1. 5 m不满足该隧道开挖稳定的要求,从支护结构内力分布角度来看,循环进尺长度越小对支护结构内力分布越有利,因此,三台阶法开挖该隧道时,循环进尺长度设置为1～1. 5 m能保证该隧道的开挖稳定。
Based on a large-section shallow-buried tunnel project of an expressway,combined with the finite element numerical analysis method, the reasonable cyclic footage of the three-step construction method of the tunnel is simulated and analyzed from four angles: vertical displacement of surrounding rock,convergence of tunnel clearance,internal force of supporting structure and plastic zone of surrounding rock. The comprehensive analysis results show that the length of circular footage is larger than 1. 5 m,which does not meet the requirement of the tunnel excavation stability. From the point of view of the internal force distribution of the support structure,the smaller the length of circular footage is,the more favorable the distribution of internal force of the support structure is. Therefore,when the three-step method is used to excavate the tunnel,the length of circular footage is set to 1 ～ 1. 5 m,which can ensure the stability of the tunnel excavation.
Based on a large-section shallow-buried tunnel project of an expressway,combined with the finite element numerical analysis method, the reasonable cyclic footage of the three-step construction method of the tunnel is simulated and analyzed from four angles: vertical displacement of surrounding rock,convergence of tunnel clearance,internal force of supporting structure and plastic zone of surrounding rock. The comprehensive analysis results show that the length of circular footage is larger than 1. 5 m,which does not meet the requirement of the tunnel excavation stability. From the point of view of the internal force distribution of the support structure,the smaller the length of circular footage is,the more favorable the distribution of internal force of the support structure is. Therefore,when the three-step method is used to excavate the tunnel,the length of circular footage is set to 1 ～ 1. 5 m,which can ensure the stability of the tunnel excavation.
引文
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[2]李波,吴立,左清军,等.复杂地质条件下特大断面隧道施工工法及其循环进尺参数的优化研究[J].安全与环境工程,2014,24(4):159-164.
[3]梁桥,孙志彬,潘秋景,等.基于极限平衡与上限法的隧道循环进尺分析[J].中国公路学报,2016,29(4):96-106.
[4]凌同华,周凯,谢伟华,等.深埋隧道断层段循环进尺优化模拟研究[J].交通科学与工程,2016,32(2):73-78.
[5]梁桥,杨小礼,陈翔.隧道循环进尺的极限平衡分析[J].华南理工大学学报(自然科学版),2017,45(5):113-119.
[6]Xu C,Liang L,Chen Q.Explicit analytical solutions for surrounding rock stress of a shallow buried tunnel considering seepage effect[J].European Journal of Environmental and Civil Engineering,2017,1(11):1-15.
[7]Ardakani A,Bayat M,Javanmard M.Numerical modeling of soil nail walls considering Mohr Coulomb,hardening soil and hardening soil with small-strain stiffness effect models[J].Geomechanics and Engineering,2014,4(6):391-401.
[8]Chen Z.Dynamic Response of Shallow Buried Tunnel Subjected to SH Wave[J].Advanced Materials Research,2011,8(5):163-167.
[9]宋玉婷,巢万里.连拱隧道渗流防护措施的数值模拟研究[J].公路工程,2016,41(3):111-116.