基于湿陷性黄土流变特性的隧道稳定性分析
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摘要
以甘肃兰州定远隧道为研究对象,利用flac3d软件建立了湿陷性黄土隧道数值模型,基于隧道台阶法开挖过程中不同工况下的围岩应力和位移变化规律,分析了隧道开挖过程中的围岩稳定性.结合湿陷性黄土的流变特性,选取burgers蠕变模型,对二衬结束后的隧道围岩进行了30年蠕变计算,通过围岩的位移收敛趋势和支护结构的应力变化规律,研究了隧道的长期稳定.研究表明,对隧道稳定性最不利的断面在隧道的最大埋深处,在230d左右后,其沉降基本收敛,隧道进入稳定阶段.
Taking the Dingyuan tunnel in Lanzhou,Gansu Province as the research object,the numerical model of the collapsible loess tunnel was established with the flac3 dsoftware,and the variation laws of the stress and displacement of the surrounding rock were analyzed under different working conditions during the tunnel excavation process,then the stability of surrounding rock in tunnel excavation was evaluated.Based on the rheological properties of collapsible loess,the burgers creep model was selected,and the 30 years creepage of the tunnel surrounding rock after the completion of the second liner was calculated.Through analyzing the convergence trend of the surrounding rock and the supporting structure,the long-term stability of the tunnel was analyzed.The study shows that the most dangerous section of the tunnel is at the maximum depth.After about 230 days,the settlement is basically converged and the tunnel enters a stable stage.
Taking the Dingyuan tunnel in Lanzhou,Gansu Province as the research object,the numerical model of the collapsible loess tunnel was established with the flac3 dsoftware,and the variation laws of the stress and displacement of the surrounding rock were analyzed under different working conditions during the tunnel excavation process,then the stability of surrounding rock in tunnel excavation was evaluated.Based on the rheological properties of collapsible loess,the burgers creep model was selected,and the 30 years creepage of the tunnel surrounding rock after the completion of the second liner was calculated.Through analyzing the convergence trend of the surrounding rock and the supporting structure,the long-term stability of the tunnel was analyzed.The study shows that the most dangerous section of the tunnel is at the maximum depth.After about 230 days,the settlement is basically converged and the tunnel enters a stable stage.
引文
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[5]陈殿强,郝哲,于永江,等.大跨度公路隧道围岩长期稳定性反分析[J].辽宁工程技术大学学报(自然科学版),2011(6):866-869.
[6]HU S,WU T.Study on deformation characteristics of surrounding rock in excavation construction with three-step method for sanming railway tunnel[J].Construction Technology,2016(1):55-59.
[7]YUAN X,LIAO D,CORPORATION P C.Research on surrounding rock long-term stability of soft rock tunnel[J].Chinese Journal of Underground Space&Engineering,2017(2):248-253.
[8]马骏.对大跨度公路隧道围岩长期稳定性的研究[J].交通世界,2014(6):110-111.
[2]张登飞,陈存礼,杨炯,等.侧限条件下增湿时湿陷性黄土的变形及持水特性[J].岩石力学与工程学报,2016,35(3):604-612.
[3]马莉英,肖树芳,王清.黄土的流变特性模拟与研究[J].实验力学,2004,19(2):178-182
[4]KORZENIOWSKI W.Rhelogical model of hard rock pillar[J].Rock Mech and Rock Engong,1991,24:155-166.
[5]陈殿强,郝哲,于永江,等.大跨度公路隧道围岩长期稳定性反分析[J].辽宁工程技术大学学报(自然科学版),2011(6):866-869.
[6]HU S,WU T.Study on deformation characteristics of surrounding rock in excavation construction with three-step method for sanming railway tunnel[J].Construction Technology,2016(1):55-59.
[7]YUAN X,LIAO D,CORPORATION P C.Research on surrounding rock long-term stability of soft rock tunnel[J].Chinese Journal of Underground Space&Engineering,2017(2):248-253.
[8]马骏.对大跨度公路隧道围岩长期稳定性的研究[J].交通世界,2014(6):110-111.