强震区穿越软硬交界面铁路隧道结构抗震技术研究
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摘要
高烈度地震区隧道洞口段穿越软硬交界面易遭受严重破坏,基于成兰铁路隧道工程,对洞口段软硬交界面隧道动力响应规律及其抗震设防措施展开一系列研究,得出双线铁路隧道洞口段穿越软硬交界面铁路隧道结构的动力响应规律;在基覆交界面处对比分析隧道减震层与渐进式注浆加固两种方案,得出在强震作用下隧道围岩渐进式注浆方案对衬砌结构具有良好的抗减震效果,大大减小隧道衬砌变形和应力峰值的结论。而隧道减震层方案对衬砌结构抗震性能提升较小,右线隧道拱腰和左线隧道拱腰受力最大,需加强隧道结构抗震加固措施。
Investigations of earthquake instances show that tunnel entrance in high intensity earthquake zones through soft interface suffers serious damage. Based on Chengdu-Lanzhou railway tunnel engineering,a series of researches are conducted on the dynamic response of tunnels crossing soft and hard rock and the fortified seismic measures to find dynamic response regularity of double-track railway tunnel through the interface between soft and hard rock. Two shock absorption measures by setting up shock absorption layer and performing progressive grouting in the interface are investigated. It is concluded that the progressive grouting greatly reduces the deformation and stress peak value of tunnel lining in the case of strong earthquake,and has good damping effect on lining structure. However,setting up shock absorption layer has less damping effect on lining structure. The right tunnel arch waist and the left tunnel arch waist bear the maximum stress,where seismic measures need to be strengthened.
Investigations of earthquake instances show that tunnel entrance in high intensity earthquake zones through soft interface suffers serious damage. Based on Chengdu-Lanzhou railway tunnel engineering,a series of researches are conducted on the dynamic response of tunnels crossing soft and hard rock and the fortified seismic measures to find dynamic response regularity of double-track railway tunnel through the interface between soft and hard rock. Two shock absorption measures by setting up shock absorption layer and performing progressive grouting in the interface are investigated. It is concluded that the progressive grouting greatly reduces the deformation and stress peak value of tunnel lining in the case of strong earthquake,and has good damping effect on lining structure. However,setting up shock absorption layer has less damping effect on lining structure. The right tunnel arch waist and the left tunnel arch waist bear the maximum stress,where seismic measures need to be strengthened.
引文
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[3]李忠宝.地震高烈度地区隧道抗震技术分析[J].建筑技术开发,2016(5):88 89.
[4]周德培.高烈度地震区浅埋大跨隧道施工技术及抗震材料[J].现代隧道技术,2001(2):1 4.
[5]罗军伟.城市浅埋隧道的抗震及减震措施分析[J].科技创新与应用,2015(17):213.
[6]高波,王峥峥,袁松,等.汶川地震公路隧道震害启示[J].西南交通大学学报,2009(3):336 341.
[7]高峰.地下结构动力分析若干问题研究[D].成都:西南交通大学,2003.
[8]张维庆.穿越断层隧道震害机理以及抗减震技术研究[D].成都:西南交通大学,2012.
[9]汤建良.高烈度地震区公路隧道抗震设防及减震措施研究[D].重庆:重庆交通大学,2009.
[10]信春雷,高波,周佳媚,等.跨断层隧道设置常规抗减震措施振动台试验研究[J].岩石力学与工程学报,2014(10):2047 2055.
[11]唐锞.山岭隧道洞口段地震动力响应影响因素规律研究[D].成都:西南交通大学,2009.
[12]殷允腾,李廷春.土岩软硬结合部隧道结构的震害机理分析及抗震研究[J].现代隧道技术,2013(4):84 91.
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[14]申玉生,邹成路,靳宗振,等.穿越软硬交界面隧道结构动力响应特性研究[J].现代隧道技术,2015(3):95 102.
[15]Shen Yusheng,Gao Bo,Yang X M,et al.Seismic Damage Mechanism and Dynamic Deformation Characteristic Analysis of Mountain Tunnel after Wenchuan Earthquake[J].Engineering Geology,2014,180:85 98.
[16]中华人民共和国铁道部.TB 10003—2005铁路隧道设计规范[S].北京:中国铁道出版社,2005.