围岩级别对强震作用下隧道地震响应的影响
|
摘要
汶川地震表明,山岭地区公路隧道衬砌结构可能在强震作用下发生严重的损害,而围岩条件是震害现象的重要影响因素之一。针对典型公路隧道在六种围岩条件下的地震响应进行了有限元时程分析。结果表明,围岩条件较好时,岩体强度高,在强震作用下破坏较小,因此在相同的地震波作下,隧道位置处加速度响应较大,而地震附加应力越小;围岩条件较差时,岩体在地震作用下易于破坏,起到了吸振的作用,因此隧道位置处加速度响应较小,但对隧道结构约束力下降,导致地震附加应力较大。
It was shown in the Wenchuan Earthquake that the mountain tunnels might suffer serious damage under severe earthquakes.The rock conditions maybe one of the important influencing factors with regard to seismic hazard of tunnels.In this paper,seismic analyses of typical road tunnels are carried out with six rocks classes by time history method.The numerical results demonstrated that as the rock condition was good,the rock had little damage under severe earthquake,which caused the energy depleted by the rock was small,so the acceleration of tunnel would be larger,however the additional stress of the tunnel was small due to the restriction of the surrounding rock;when the rock condition is bad,rock damage depleted the earthquake energy,caused small acceleration,however the weak constriction of surrounding rock caused high additional stress of the tunnel.
It was shown in the Wenchuan Earthquake that the mountain tunnels might suffer serious damage under severe earthquakes.The rock conditions maybe one of the important influencing factors with regard to seismic hazard of tunnels.In this paper,seismic analyses of typical road tunnels are carried out with six rocks classes by time history method.The numerical results demonstrated that as the rock condition was good,the rock had little damage under severe earthquake,which caused the energy depleted by the rock was small,so the acceleration of tunnel would be larger,however the additional stress of the tunnel was small due to the restriction of the surrounding rock;when the rock condition is bad,rock damage depleted the earthquake energy,caused small acceleration,however the weak constriction of surrounding rock caused high additional stress of the tunnel.
引文
[1]同济大学土木工程防灾国家重点实验室.汶川地震震害[M].上海:同济大学出版社,2008.
[2]高峰,关宝树.隧道地震反应分析中几种边界条件的比较[J].甘肃科学学报,2004,16(1):109-112.
[3]朱合华,陶履彬.盾构隧道衬砌结构受力分析的梁一弹簧系统模型[J].岩土力学,1998,19(2):26-32.
[4]杨军,尚昊.软土隧道地震反应的数值分析[J].建筑技术开发,2003,30(11):26-27.
[5]孙海涛,徐迎伍.软土地层中盾构隧道地震反应分析[J].勘察科学技术,2000,(1):10-14.
[6]刘根.高烈度地震区隧道地震动力响应研究[D].成都:西南交通大学,2008.
[2]高峰,关宝树.隧道地震反应分析中几种边界条件的比较[J].甘肃科学学报,2004,16(1):109-112.
[3]朱合华,陶履彬.盾构隧道衬砌结构受力分析的梁一弹簧系统模型[J].岩土力学,1998,19(2):26-32.
[4]杨军,尚昊.软土隧道地震反应的数值分析[J].建筑技术开发,2003,30(11):26-27.
[5]孙海涛,徐迎伍.软土地层中盾构隧道地震反应分析[J].勘察科学技术,2000,(1):10-14.
[6]刘根.高烈度地震区隧道地震动力响应研究[D].成都:西南交通大学,2008.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心