小净距隧道地震动力响应下的围岩应力场
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摘要
针对强地震作用下小净距隧道围岩的力学特征,采用三维数值模拟的手段,并引入基于Mohr-Coulomb准则的屈服接近度函数作评价指标,对多种净距条件下隧道围岩地震动力响应特征进行了深入研究。研究结果表明,在强地震作用下,小净距隧道围岩的破坏发展规律是由边仰坡开始,再逐渐由洞口向洞身段发展;小净距隧道中夹岩的应力状态与其净距密切相关,净距越小,距洞口的距离越近,小净距隧道中夹岩屈服接近度值越大;而洞周其余围岩的应力状态仅在间距较小时与隧道间距有关,当隧道间距增大到一定程度后,不再有相关性;最后建议采用以YAI≤0.2的应力状态作为小净距隧道抗震设计的应力标准。
Considering the mechanical behavior of surrounding rock under strong seismic action on tunnels with small spacing,by introducing the yield approach index(YAI) function based on Mohr-Coulomb yield criterion as evaluation index,3D numerical simulation was employed to analyze the seismic response characteristics of surrounding rock of tunnel with various kinds of spacing.The results indicate that(1) the surrounding rock of small spacing tunnels is damaged beginning from front slope,then from tunnel entrance to tunnel trunk;(2) the stress state of the shared rock of small spacing tunnels is closely related to the spacing,the smaller the spacing and the closer to tunnel entrance,the larger the YAI value;(3) the stress state of other surrounding rock is relevant to tunnel spacing only when spacing is smaller,it is not relevant to tunnel spacing when spacing is larger.Finally,the stress state of YAI≤0.2 was proposed as anti-seismic design criterion.
Considering the mechanical behavior of surrounding rock under strong seismic action on tunnels with small spacing,by introducing the yield approach index(YAI) function based on Mohr-Coulomb yield criterion as evaluation index,3D numerical simulation was employed to analyze the seismic response characteristics of surrounding rock of tunnel with various kinds of spacing.The results indicate that(1) the surrounding rock of small spacing tunnels is damaged beginning from front slope,then from tunnel entrance to tunnel trunk;(2) the stress state of the shared rock of small spacing tunnels is closely related to the spacing,the smaller the spacing and the closer to tunnel entrance,the larger the YAI value;(3) the stress state of other surrounding rock is relevant to tunnel spacing only when spacing is smaller,it is not relevant to tunnel spacing when spacing is larger.Finally,the stress state of YAI≤0.2 was proposed as anti-seismic design criterion.
引文
[1]姚勇,何川,谢卓雄.双线小净距隧道中岩墙力学特征及加固措施研究[J].岩土力学,2007,28(9):1883-1888.YAO Yong,HE Chuan,XIE Zhuoxiong.MechanicalBehavior and Reinforcing Measures of Middle Rockwall ofParallel Tunnel with Small Interval[J].Rock andSoilMechanics,2007,28(9):1883-1888.
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[9]张传庆.基于破坏接近度的岩石工程安全性评价方法的研究[D].北京:中国科学院,2006.ZHANG Chuanqing.Study on Method of Safety Evaluationfor Rock Engineering Based on Failure Approach Index[D].Beijing:Chinese Academy of Sciences,2006.
[10]袁松.地震动力响应下公路隧道合理净距的研究[D].成都:西南交通大学,2008.YUAN Song.Research on Reasonable Spacing of HighwayTunnel under Seismic Dynamic Response[D].Chengdu:Southwest Jiaotong University,2008.
[11]周荣军,何玉林.北京至昆明高速公路四川境雅安至泸沽项目地震安全性评价报告[R].成都:四川赛思特科技有限责任公司,2005.ZHOU Rongjun,HE Yulin.Seismic Safety AppraisalReport of Yaan-Lugu Freeway Project for Beijing-KunmingExpressway[R].Chengdu:Sichuan Sast TechnologyCo.Ltd,2005.
[12]JTG D70—2004,公路隧道设计规范[S].JTG D70—2004,Code for Design of Road Tunnel[S].
[2]姚勇,何川,张玲玲.紫坪埔隧道小净距段现场监测试验研究[J].岩石力学与工程学报,2010,29(增1):3295-3300.YAO Yong,HE Chuan,ZHANG Lingling.ExperimentalStudy of Site Monitoring of Zipingpu Tunnel with SmallClear Spacing[J].Chinese Journal of Rock Mechanicsand Engineering,2010,29(s1):3295-3300.
[3]刘艳青,钟世航,卢汝绥,等.小净距并行隧道力学状态的试验研究[J].岩石力学与工程学报,2000,19(5):590-594.LIU Yanqing,ZHONG Shihang,LU Rusui,et al.Experimental Study on Mechanical Characteristics of TwinTunnels with Small Spacing[J].Chinese Journal of RockMechanics and Engineering,2000,19(5):590-594.
[4]晏启祥,刘记,何川.公路盾构隧道地震响应的反应位移法分析[J].公路交通科技,2011,28(4):96-99.YAN Qixiang,LIU Ji,HE Chuan.Analysis on SeismicResponse of Highway Shield Tunnel Using ResponseDisplacement Method[J].Journal of Highway andTransportation Research and Development,2011,28(4):96-99.
[5]李育枢,李天斌.高烈度地震区山岭隧道洞口减震问题的数值模拟研究[J].公路交通科技,2009,26(10):100-104.LI Yushu,LI Tianbin.Numerical Simulation of ShockAbsorption of Mountainous Tunnel Portal in Highly SeismicRegion[J].Journal of Highway and TransportationResearch and Development,2009,26(10):100-104.
[6]王永刚,丁文其,景韧.关山隧道断层破碎带三维有限元地震动力响应[J].公路交通科技,2011,28(8):115-119.WANG Yonggang,DING Wenqi,JING Ren.SeismicDynamic Response of Fault Fracture Zone at GuanshanTunnel Based on 3D FEM[J].Journal of Highway andTransportation Research and Development,2011,28(8):115-119.
[7]李云鹏,王芝银,韩常领,等.考虑地震影响的小间距隧道围岩流变损伤[J].长安大学学报:自然科学版,2006,26(2):51-56.LI Yunpeng,WANG Zhiyin,HAN Changling,et al.Rheologic Damage and Earthquake Influence onSurrounding Rock of Small Spacing Tunnels[J].Journalof Chang'an University:Natural Science Edition,2006,26(2):51-56.
[8]王峥峥,高波,索然绪.双洞隧道洞口段抗减震振动台试验[J].中国公路学报,2009,22(2):71-76.WANG Zhengzheng,GAO Bo,SUO Ranxu.ShakingTable Tests on Entrance Anti-seism of Double TrackTunnels[J].China Journal of Highway and Transport,2009,22(2):71-76.
[9]张传庆.基于破坏接近度的岩石工程安全性评价方法的研究[D].北京:中国科学院,2006.ZHANG Chuanqing.Study on Method of Safety Evaluationfor Rock Engineering Based on Failure Approach Index[D].Beijing:Chinese Academy of Sciences,2006.
[10]袁松.地震动力响应下公路隧道合理净距的研究[D].成都:西南交通大学,2008.YUAN Song.Research on Reasonable Spacing of HighwayTunnel under Seismic Dynamic Response[D].Chengdu:Southwest Jiaotong University,2008.
[11]周荣军,何玉林.北京至昆明高速公路四川境雅安至泸沽项目地震安全性评价报告[R].成都:四川赛思特科技有限责任公司,2005.ZHOU Rongjun,HE Yulin.Seismic Safety AppraisalReport of Yaan-Lugu Freeway Project for Beijing-KunmingExpressway[R].Chengdu:Sichuan Sast TechnologyCo.Ltd,2005.
[12]JTG D70—2004,公路隧道设计规范[S].JTG D70—2004,Code for Design of Road Tunnel[S].
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