隧道动力深浅埋界限及其影响因素研究
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摘要
通过有限元模拟计算了不同围岩条件、洞跨及地震烈度下的隧道地震反应特性,研究了隧道动力深浅埋划分界限及其影响因素。结果表明:隧道结构受力随着隧道埋深的增加呈现先增后减的变化规律,可见拐点即为深浅埋界限;围岩条件越好,隧道的动力深浅埋界限越深,隧道在Ⅲ级、Ⅳ级及Ⅴ级围岩条件下的动力深浅埋界限分别为100,80,60 m左右;隧道动力深浅埋界限深度随着隧道跨度的增加而减小,但其受影响程度较小,隧道在跨径为6,10,20 m的情况下的动力深浅埋界限分别为100,100,80 m左右;隧道动力深浅埋界限不受地震烈度的影响。
The boundary of shallowly buried tunnel and deeply buried tunnel on dynamic characteristics and its influence factors are studied by using finite element to simulate the seismic response of tunnel with different surrounding rock condition,different tunnel span and different seismic intensity.The research results show that the stress of tunnel structure increases at first,and then decreases with increase of the buried depth.It indicates that the inflection point is the boundary of shallowly buried tunnel and deeply buried tunnel.The better the surrounding rock condition,the deeper the depth of the boundary will be,and in that condition the depth of the boundary in grade Ⅲ,grade Ⅳand grade Ⅴ rock is about 100,80 and 60 m respectively.The depth of the boundary decreases with the increase of the tunnel span,but the influence is little.In that condition the span is 6,10,20 m,and the corresponding depth of the boundary is about 100,100,80 m respectively.The seismic intensity will not influence the boundary of shallowly buried tunnel and deeply buried tunnel.
The boundary of shallowly buried tunnel and deeply buried tunnel on dynamic characteristics and its influence factors are studied by using finite element to simulate the seismic response of tunnel with different surrounding rock condition,different tunnel span and different seismic intensity.The research results show that the stress of tunnel structure increases at first,and then decreases with increase of the buried depth.It indicates that the inflection point is the boundary of shallowly buried tunnel and deeply buried tunnel.The better the surrounding rock condition,the deeper the depth of the boundary will be,and in that condition the depth of the boundary in grade Ⅲ,grade Ⅳand grade Ⅴ rock is about 100,80 and 60 m respectively.The depth of the boundary decreases with the increase of the tunnel span,but the influence is little.In that condition the span is 6,10,20 m,and the corresponding depth of the boundary is about 100,100,80 m respectively.The seismic intensity will not influence the boundary of shallowly buried tunnel and deeply buried tunnel.
引文
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[2]JTGT D70—2010公路隧道设计细则[S].北京:人民交通出版社,2010.JTGT D 70—2010 Guidelines for Design of Highway Tunnel[S].Beijing:China Communications Press,2010.
[3]舒亚俐.构筑物不同埋深时地震动反分析探讨[J].特种结构,1997,14(4):49-55.Shu Yali.Seismic response analysis on structure with different burialdepth[J].Special Structure,1997,14(4):49-55.
[4]李加林,邓飞皇.隧道埋深对地铁运行诱发振动的影响分析[J].科学技术与工程,2007(15):3819-3822.Li Jialin,Deng Feihuang.Influence of tunnel burial depth on dynam-ic response induced by metro operation[J].Science Technology andEngineering,2007(15):3819-3822.
[5]李海波,马行东,李俊如,等.地震荷载作用下地下岩体洞室位移特征的影响因素分析[J].岩土工程学报,2006,28(3):358-362.Li Haibo,Ma Xingdong,Li Junru,et al.Study on influence factors ofrock cavern displacement under earthquake[J].Chinese Journal ofGeotechnical Engineering,2006,28(3):358-362.
[6]李海波,刘博,吕涛,等.一种简单的岩体地下洞室地震安全评价方法[J].岩土力学,2009,30(7):1873-1882.Li Haibo,Liu Bo,Lv Tao,et al.A simple safety assessment methodfor underground engineering in rock under seismic loading[J].Rockand Soil Mechanics,2009,30(7):1873-1882.
[7]左宇军,唐春安,李术才.含不连续面巷道的动力破坏过程数值分析[J].地下空间与工程学报,2008,4(4):595-599.Zuo Yujun,Tang Chunan,Li Shucai.Numerical analysis on failureprocess of rock tunnel with discontinuity under dynamic disturbance[J].Chinese Journal of Underground Space and Engineering,2008,4(4):595-599.
[8]许增会,宋宏伟,赵坚.地震对隧道围岩稳定性影响的数值模拟分析[J].中国矿业大学学报,2004,33(1):41-44.Xu Zenghui,Song Hongwei,Zhao Jian.Numerical analysis of stabili-ty of tunnel surrounding rocks under earthquake[J].Journal of Chi-na University of Mining&Technology,2004,33(1):41-44.
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