应力剪胀对浅埋隧道稳定性系数的影响
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摘要
考虑剪胀对隧道围岩稳定性的影响,对浅埋圆形盾构隧道、浅埋两车道公路隧道和浅埋双线铁路隧道在围岩发生塑性流动时进行力学特征分析。分析圆形盾构隧道围岩的位移,塑性区分布和最大剪切应变率;计算圆形断面、双线铁路隧道、双车道公路隧道等3种不同断面形状隧道的稳定性系数,分析剪胀角对围岩稳定性系数的影响。研究结果表明:剪胀角对围岩位移的影响存在一个临界值;在围岩发生塑性流动时,塑性区随着剪胀角的增大而逐渐增加;剪胀角对围岩剪切破坏带和围岩稳定性系数都有较大影响;随着剪胀角的变化,隧道临界稳定系数也发生变化。
Considering the influence of shear dilation on the stability of surrounding rock,mechanical performance using finite differential code was conducted for circular shallow tunnels,two-lane highway shallow tunnels and double-track railway shallow tunnels when plastic flow occurred in the surrounding rock.Under the given conditions,the displacement,plastic zone and maximum shear strain rate of circular tunnel were emphatically simulated and analyzed.The stability factor of three tunnels was computed,and the influence of dilation angle on the stability factor was analyzed.The results show that there is a critical dilation angle which impacts the displacement of surrounding rock,that the plastic zone increases with the increase of the dilation angle,that the dilation angle has important effect on the shear bond and stability factors,and that the critical stability factors change along with the change of dilation angle when the shear dilation of surrounding rock is considered.
Considering the influence of shear dilation on the stability of surrounding rock,mechanical performance using finite differential code was conducted for circular shallow tunnels,two-lane highway shallow tunnels and double-track railway shallow tunnels when plastic flow occurred in the surrounding rock.Under the given conditions,the displacement,plastic zone and maximum shear strain rate of circular tunnel were emphatically simulated and analyzed.The stability factor of three tunnels was computed,and the influence of dilation angle on the stability factor was analyzed.The results show that there is a critical dilation angle which impacts the displacement of surrounding rock,that the plastic zone increases with the increase of the dilation angle,that the dilation angle has important effect on the shear bond and stability factors,and that the critical stability factors change along with the change of dilation angle when the shear dilation of surrounding rock is considered.
引文
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[12]杨小礼,眭志荣.软弱围岩中偏压隧道的剪胀特性研究[J].岩土力学,2007,28(Suppl):501-504.YANG Xiao-li,SUI Zhi-rong.Influence of dilation on stability of bias tunnels in weak rock[J].Rock and Soil Mechanics,2007,28(Suppl):501-504.
[13]杨小礼,李亮,刘宝琛.偏压隧道结构稳定性评价的信息优化分析[J].岩石力学与工程学报,2002,21(4):484-488.YANG Xiao-li,LI Liang,LIU Bao-chen.Evaluation on structure stability of asymmetrically loaded tunnels using the theory of information optimization analysis[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(4):484-488.
[14]YANG Xiao-li,ZOU Jin-feng,SUI Zhi-rong.Effects of intermediate principal stress on rock cavity stability[J].Journal of Central South University of Technology,2007,14(S1):165-169.
[2]Wang Y J,Yin J H,Lee C F.The influence of a non-associated flow rule on the calculation of the factor of safety of soil slopes[J].International Journal for Numerical and Analytical Methods in Geomechanics,2001,25:1351-1359.
[3]Wang Y J,Yin J H.Wedge stability analysis considering dilatancy of discontinuities[J].Rock Mechanics and Rock Engineering,2002,35(2):127-137.
[4]JENG Fu-shu,WENG Meng-chai,HUANG T H,et al.Deformational characteristics of weak sandstone and impact to tunnel deformation[J].Tunnelling and Underground Space Technology,2002,17:263-274.
[5]Fuenkajorn K,Serata S.Numerical simulation of strain-softening and dilation of rock salt[J].International Journal of Rock Mechanics and Mining Sciences,1993,30(7):1303-1306.
[6]Broms B B,Bennermark H.Stability of clay in vertical openings[J].Soil Mech Found Div ASCE,1967,193(1):71-94.
[7]Davis E H,Gunn M J,Mair R J,et al.The stability of shallow tunnels and underground openings in cohesive material[J].Geotechnique,1980,30(4):397-416.
[8]姜功良.浅埋软土隧道稳定性极限分析[J].土木工程学报,1998,31(5):65-72.JIANG Gong-liang.Limit analysis of the stability of shallow tunnels in soft ground[J].China Civil Engineering Journal,1998,31(5):65-72.
[9]JDG D70—2004,公路隧道设计规范[S].JDG D70—2004,Code for Design of Road Tunnel[S].
[10]杨小礼,眭志荣.浅埋小净距偏压隧道施工工序的数值分析[J].中南大学学报:自然科学版,2007,38(4):764-770.YANG Xiao-li,SUI Zhi-rong.Numerical simulation of construction sequence for shallow embedded bias tunnels with small clear distance[J].Journal of Central South University:Science and Technology,2007,38(4):764-770.
[11]杨小礼,张丙强,王志斌.浅埋大跨度连拱隧道地震反应分析[J].中南大学学报:自然科学版,2006,37(5):991-996.YANG Xiao-li,ZHANG Bing-qiang,WANG Zhi-bin.Earthquake response of large span and double-arch shallow tunnel[J].Journal of Central South University:Science and Technology,2006,37(5):991-996.
[12]杨小礼,眭志荣.软弱围岩中偏压隧道的剪胀特性研究[J].岩土力学,2007,28(Suppl):501-504.YANG Xiao-li,SUI Zhi-rong.Influence of dilation on stability of bias tunnels in weak rock[J].Rock and Soil Mechanics,2007,28(Suppl):501-504.
[13]杨小礼,李亮,刘宝琛.偏压隧道结构稳定性评价的信息优化分析[J].岩石力学与工程学报,2002,21(4):484-488.YANG Xiao-li,LI Liang,LIU Bao-chen.Evaluation on structure stability of asymmetrically loaded tunnels using the theory of information optimization analysis[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(4):484-488.
[14]YANG Xiao-li,ZOU Jin-feng,SUI Zhi-rong.Effects of intermediate principal stress on rock cavity stability[J].Journal of Central South University of Technology,2007,14(S1):165-169.
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