地裂缝错动对地铁区间隧道影响的三维离散元分析
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摘要
拟建西安地铁2号线穿越10条地裂缝,地裂缝活动将影响地铁2号线的安全运营。应用三维离散元程序3DEC建立三维计算模型,分析了裂缝带错动对地铁区间隧道盾构管线的影响,得出了不同错距工况下隧道衬砌的变形和应力。通过计算得知,当土体上下盘底部竖向错距由10 cm增大到93 cm时,引起的衬砌竖向变形量由0.712 cm增大到13.99 cm,且最大变形均发生在沿纵向约35~36m处,距裂缝带距离约为9.5~8.5m;引起的管道纵向最大拉应力则由0.65MPa增大到18.43MPa,最大压应力由0.611MPa增大到16.9MPa,且最大应力区与最大变形区一致。这一结论的获得可为地铁设计、施工及其安全运营提供科学的理论指导及设计依据。
The second subway line in Xi'an city crosses 10 ground fissures,and these ground fissures will influence the safety of subway line.Using the three-dimensional(3D) distinct element code(3DEC),a computational model is built.The effect of ground fissure dislocation on the shield pipeline of running tunnel of subway is examined.The deformations and stresses under different dislocations of tunnel lining is obtained.The calculated results show that,If the dislocation is changed from 10 to 93 cm,the deformation will be changed from 0.712 to 13.99 cm,and the maximum deformation will occur at 35 to 36 m along longitudinal direction about 9.5 to 8.5 m distance to ground fissures.The maximum tensile stress will be changed from 0.65 to 18.43 Mpa,and the maximum compression stress will be changed from 0.611 to 16.9 MPa.The maximum deformation and stress zones are uniform.The findings can provide effective design parameters and scientific evidences for quantify the effect of ground fissures dislocation on running tunnel of subway.
The second subway line in Xi'an city crosses 10 ground fissures,and these ground fissures will influence the safety of subway line.Using the three-dimensional(3D) distinct element code(3DEC),a computational model is built.The effect of ground fissure dislocation on the shield pipeline of running tunnel of subway is examined.The deformations and stresses under different dislocations of tunnel lining is obtained.The calculated results show that,If the dislocation is changed from 10 to 93 cm,the deformation will be changed from 0.712 to 13.99 cm,and the maximum deformation will occur at 35 to 36 m along longitudinal direction about 9.5 to 8.5 m distance to ground fissures.The maximum tensile stress will be changed from 0.65 to 18.43 Mpa,and the maximum compression stress will be changed from 0.611 to 16.9 MPa.The maximum deformation and stress zones are uniform.The findings can provide effective design parameters and scientific evidences for quantify the effect of ground fissures dislocation on running tunnel of subway.
引文
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[2]彭建兵等.渭河盆地活动断裂与地质灾害[M].西安:西北大学出版社,1990.Peng Jianbing.Geo-hazard and active fault in Weihe basin.Xi′an:Northwestern University Press,1990.
[3]易学发,苏刚,王卫东等.西安地裂缝带的基本特征与形成机制[J].地震地质,1997,4(19):289~295.Yi Xuefa,Su Gang,Wang Weidong.Basic character and deform-ation mechanism of ground fissures belt in Xi′an city.EarthquakeGeology,1997,4(19):289~295.
[4]王泳嘉,邢纪波.离散元法及其在岩土力学中的应用[M].沈阳:东北大学出版社,1991.Wang Yongjia,Xing Jibo.Distinct element method and its appli-cation in geotechnics.Shenyang:Northeastern University Press,1991.
[5]孙萍,李忠良,彭建兵,等.公路隧道围岩塌方离散元模拟[J].公路交通科技,2005,9(22):122~125.Sun Ping,Li Zhongliang,Peng Jianbing.Simulating the highwaytunnel collap se by distinct element method.Journal of Highwayand Transportation Research and Development,2005,9(22):122~125.
[6]郑书彦,李占斌,等.滑坡侵蚀离散元分析研究[J].岩石力学与工程学报,2004,24(12):25~28.Zheng Shuyan,Li Zhanbin.Research on slip erosion with distinctelement method.Chinese Journal of Rock Mechanics and Engi-neering,2004,24(12):25~28.
[7]徐泳,孙其成,等.颗粒离散元研究进展[J].力学进展,2003,33(2):251~260.Xu Yong,Sun Qicheng.Development of research on particle dis-tinct element method.Advances in Mechanics,2003,33(2):251~260.
[8]宿文姬,朱仙华,潘健.小净距公路隧道稳定性数值模拟分析[J].工程地质学报,2006,14(2):253~256.Su Wenji,Zhu Xianhua,et al..Finite element analysis of stabili-ty of a small clear-span tunnel.Journal of Engineering Geology,2006,14(2):253~256.
[9]李凯玲,张亚,刘妮娜.土-地铁隧道动力相互作用模型试验分析[J].工程地质学报,2007,15(4):534~538.Li Kailing,Zhang Ya,Liu Nina.Model test of soil-metro tunneldynamic interaction.Journal of Engineering Geology,2007,15(4):534~538.
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