高烈度地震区公路隧道洞口段地震响应分析
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摘要
根据隧道地震安全性评价报告和地勘资料,建立了三维数值计算模型并采用一致粘弹性人工边界模拟动力边界,对高烈度地震区公路隧道洞口段进行了瞬态动力计算。计算结果表明:在三向地震荷载激励下,洞口段衬砌的地震响应具有明显滞后性,衬砌以水平横向振动为主、轴向振动次之、竖向振动最弱;洞口段衬砌的拱腰部位将承受极大拉应力和剪应力,可设减震层吸收地震能量。通过对衬砌相对位移的分析得出,衬砌横向和轴向变形都很小,衬砌稳定性尚好。
According to the report of seismic safety evaluation and the geological exploration data of the tunnel,a three-dimensional numerical model was established incorporating viscous-spring artificial boundaries and transient dynamic analysis was performed for the highway tunnel entrance in the region with high-intensity earthquake.Results showed that the seismic responses of the lining at the tunnel entrance lagged far behind the three dimensional seismic load.Horizontal vibration of lining was most obvious,while axial vibration as well as vertical vibration were the weakest.Arch-waist of the lining will sustain large tensile stresses and shearing stresses,shock absorption layer can be put behind the lining at this part to damp the seismic energy.Transverse and axial deformations of the lining were small through the analysis,the lining was stable.
According to the report of seismic safety evaluation and the geological exploration data of the tunnel,a three-dimensional numerical model was established incorporating viscous-spring artificial boundaries and transient dynamic analysis was performed for the highway tunnel entrance in the region with high-intensity earthquake.Results showed that the seismic responses of the lining at the tunnel entrance lagged far behind the three dimensional seismic load.Horizontal vibration of lining was most obvious,while axial vibration as well as vertical vibration were the weakest.Arch-waist of the lining will sustain large tensile stresses and shearing stresses,shock absorption layer can be put behind the lining at this part to damp the seismic energy.Transverse and axial deformations of the lining were small through the analysis,the lining was stable.
引文
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[2]郑永来,杨林德,李文艺,周健.地下结构抗震[M].上海:同济大学出版社,2005-08.ZHEN Yonglai,YANG Linde,LI Wenyi,ZHOU Jian.Earthquake resistance of underground works[M].Shanghai:Tongji University Press,2005-08
[3]刘晶波,杜修力.结构动力学[M].北京:机械工业出版社,2005-01LIU Jinbo,DU Xiuli.Structural dynamics[M].Beijing:China Machine Press,2005-01
[4]丁皓江,何福保,谢贻权,徐兴.弹性和塑性力学中的有限单元法[M].北京:机械工业出版社,1989-11DING Haojiang,HE Fubao,XIE Yiquan,XU Xing.Finite element methode in elastic-plastic mechanics[M].Beijing:China Machine Press,1998-11
[5]谷音,刘晶波,杜义欣.三维一致粘弹性人工边界及等效粘弹性边界单元[J].工程力学,2007,24(12):31~37GU Yin,LIU Jinbo,DU Yixin.3D consistent viscous-spring artificial boundary and viscous-spring boundary element[J].EngineeringMechanics,2007,24(12):31~37
[6]中华人民共和国交通部.JTG D70-2004公路隧道设计规范[S].北京:人民交通出版社,2004The Ministry of Transport of the People's Republic of China.JTG D70-2004 Code for design of road tunnel[S].Beijing:ChinaCommunication Press,2004
[7]李育枢.山岭隧道地震动力响应及减震措施研究[D].上海:同济大学,2006LI Yushu.Earthquake dynamic response and shock absorption measures research on the mountain tunnels[D].Shanghai:TongjiUniversity,2006
[8]Davis C A,Lee V W,Bardet J P.Transverse response of underground cavities and pipes to incident SV waves[J].Earthquake Engineeringand Structural Dynamics.2001,30(3):383~410
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