水下盾构隧道联络通道地震响应分析
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摘要
基于有效应力动力分析法,建立广深港客运专线狮子洋水下盾构隧道主隧道、联络横通道及地层相互作用的三维模型,采用Byrne模型描述地层的动力特性,对模型分别输入横向和纵向地震波,研究主隧道结构及主隧道与联络横通道交叉部位的动力响应特征,重点分析了两种地震波对地层孔隙水压力以及隧道交叉结构受力变形的不同影响.计算结果表明:在纵横地震波作用下,地层孔隙水压力变化规律基本相同,隧道顶部地面粉细砂层发生液化,但对隧道结构影响较小;地震波入射方向对结构振动响应影响显著,横向激振对交叉结构受力变形的影响大于纵向激振;两种地震作用下结构所受的最大压、拉应力未超过强度容许值,结构抗震满足要求.由于地震作用过程中,隧道顶部土层有效应力降低较大,为防止主体结构上浮,建议对该土层进行加固处理.
Based on effective stress dynamic analysis method,a three-dimension model that consists of main tunnels,connectional passages and surrounding soil of Shi Ziyang shield tunnel is established to study structure dynamic mechanical response by inputting transverse and longitudinal seismic waves.In this model,the dynamic characteristics of liquefiable soil is simulated by Byrne's volume strain model,and the nonlinear behaviors of soil is considered.The research puts emphasis on different influences of the two seismic waves on pore water pressure and the internal forces of intersecting structure linings.The numerical results show that the incident direction of wave has a great effect on the seismic response of tunnel linings,and the damage caused by transverse waves is more serious than that of longitudinal waves;The silty and fine sand layer will be liquefied under the two waves,but it has little effect on the tunnel structure;The intersecting structure is safe because the maximum tension and compression stresses do not exceed the strength in the process of earthquake;Some reinforcement methods are proposed because the tunnel structure may float due to the heavy reduction of effective stress.
Based on effective stress dynamic analysis method,a three-dimension model that consists of main tunnels,connectional passages and surrounding soil of Shi Ziyang shield tunnel is established to study structure dynamic mechanical response by inputting transverse and longitudinal seismic waves.In this model,the dynamic characteristics of liquefiable soil is simulated by Byrne's volume strain model,and the nonlinear behaviors of soil is considered.The research puts emphasis on different influences of the two seismic waves on pore water pressure and the internal forces of intersecting structure linings.The numerical results show that the incident direction of wave has a great effect on the seismic response of tunnel linings,and the damage caused by transverse waves is more serious than that of longitudinal waves;The silty and fine sand layer will be liquefied under the two waves,but it has little effect on the tunnel structure;The intersecting structure is safe because the maximum tension and compression stresses do not exceed the strength in the process of earthquake;Some reinforcement methods are proposed because the tunnel structure may float due to the heavy reduction of effective stress.
引文
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[5]BYRNE P M.A cyclic shear-volume coupling andpore-pressure model for sand[C]//Proceedings ofthe 2nd International Conference on Recent Advancesin Geotechnical Earthquake Engineering and Soil Dy-namics.St.Lo uis,University of Missouri,1991:47-55.
[6]尹旅超,朱振宏,李玉珍,等.日本隧道盾构新技术[M].武汉:华中科技大学出版社,1999:76?79.
[7]祝彦知,冯紫良,方志.地震动下考虑各向异性土体-盾构隧道数值模拟[J].岩土力学,2005,26(5):710-716.
[8]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
[9]高峰,关宝树.沉管隧道三维地震反应分析[J].兰州铁道学院学报,2003,22(1):6-10.
[10]CHARLIE W A,VEYERA G E,DURNFORD D S.Porewater pressure increases in soil and rock from un-derground chemical and nuclear explosion[J].Engi-neering Geology,1996,43(2):225-236.
[11]刘光磊,宋二祥,刘华北.可液化地层中地铁隧道地震响应数值模拟及试验验证[J].岩土工程学报,2007,29(12):1815-1822.
[2]HUO HB,BOBETA.Seismic design of cut and coverrectangular tunnels-evaluation of observed behavior foDakai station during Kobe earthquake[C]//Proceed-ings of 1st World Forum of Chinese Scholars inGeoteclmical Engineering.Shanghai,Tongji Universi-ty,2003:456-466.
[3]国胜兵,赵毅,赵跃堂,等.地下结构在竖向和水平地震荷载作用下的动力分析[J].地下空间,2002,22(4):314-318.
[4]袁大军,黄清飞,王梦恕,等.水底液化地层大型盾构隧道地震响应分析[J].岩石力学与工程学报,2007,26(S2):3609-3615.
[5]BYRNE P M.A cyclic shear-volume coupling andpore-pressure model for sand[C]//Proceedings ofthe 2nd International Conference on Recent Advancesin Geotechnical Earthquake Engineering and Soil Dy-namics.St.Lo uis,University of Missouri,1991:47-55.
[6]尹旅超,朱振宏,李玉珍,等.日本隧道盾构新技术[M].武汉:华中科技大学出版社,1999:76?79.
[7]祝彦知,冯紫良,方志.地震动下考虑各向异性土体-盾构隧道数值模拟[J].岩土力学,2005,26(5):710-716.
[8]陈育民,徐鼎平.FLAC/FLAC3D基础与工程实例[M].北京:中国水利水电出版社,2009.
[9]高峰,关宝树.沉管隧道三维地震反应分析[J].兰州铁道学院学报,2003,22(1):6-10.
[10]CHARLIE W A,VEYERA G E,DURNFORD D S.Porewater pressure increases in soil and rock from un-derground chemical and nuclear explosion[J].Engi-neering Geology,1996,43(2):225-236.
[11]刘光磊,宋二祥,刘华北.可液化地层中地铁隧道地震响应数值模拟及试验验证[J].岩土工程学报,2007,29(12):1815-1822.
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