地震波入射角对输水隧洞地震响应的影响
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摘要
在均质围岩条件下,结合大伙房输水隧洞二期工程,对输水隧洞混凝土衬砌层进行了地震响应分析。结果表明:随着地震波入射角的增大,衬砌层的径向应力先增大后减小,当地震波入射角为45°时,径向应力最大;环向应力逐渐减小,当入射角为90°时,环向应力趋向于0;纵向应力逐渐增大,当入射角超过75°时,衬砌层的纵向应力超过环向应力。当地震波入射角为45°左右时,衬砌层径向、环向和纵向的动应力均较大,衬砌层的地震响应最不利。
Based on the 2nd phase Dahuofang Water Diversion Tunnel Project,the seismic responses of the tunnel concrete lining were analyzed under homogeneous surrounding rock.The results show that the radial stresses of the liner layer increase first and then decrease with the increasing of the seismic wave incident angle and the radical stress is up to the maximum when the seismic wave incident angle is 45°.The hoop stresses reduce gradually,and the value reduces to zero when the seismic wave incident angle is 90°.However,the longitudinal stresses increase with the increasing of the seismic wave incident angle.When the seismic wave incident angle exceeds 75°,the longitudinal stresses of the liner layer surpass the hoop stresses.When the seismic wave incident angle is about 45°,the three dynamic stresses of the lining are all larger and its seismic responses are the worst.
Based on the 2nd phase Dahuofang Water Diversion Tunnel Project,the seismic responses of the tunnel concrete lining were analyzed under homogeneous surrounding rock.The results show that the radial stresses of the liner layer increase first and then decrease with the increasing of the seismic wave incident angle and the radical stress is up to the maximum when the seismic wave incident angle is 45°.The hoop stresses reduce gradually,and the value reduces to zero when the seismic wave incident angle is 90°.However,the longitudinal stresses increase with the increasing of the seismic wave incident angle.When the seismic wave incident angle exceeds 75°,the longitudinal stresses of the liner layer surpass the hoop stresses.When the seismic wave incident angle is about 45°,the three dynamic stresses of the lining are all larger and its seismic responses are the worst.
引文
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[5]Yang Jun.Influence of Water Saturation on Horizontal and Vertical Motion at aPorous Soil Interface Induced by Incident P Wave[J].Soil Dynamics andEarthquake Engineering,2000,19:575-581.
[6]张军伟,梅志荣,高菊茹,等.大伙房输水工程特长隧洞TBM选型及施工关键技术研究[J].现代隧道技术,2010(5):1-10.
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[8]张鸿,毕继红,张伟.地铁隧道地震反应非线性分析[J].地震工程与工程振动,2004,24(6):146-153.
[9]范鹏贤,王明洋,李文培.岩土介质中圆形隧洞围岩压力理论分析进展[J].现代隧道技术,2010(2):1-7.
[10]翟贺,李鹏程,李志明,等.地震行波作用下的埋地管线最大地震反应探讨[J].特种结构,2007,24(3):1-3.
[2]George P K,George D,Bouckovalas,et al.Gantes 3-D Shell Analysis of Cy-lindrical Underground Structures Under Seismic Shear(S)Wave Action[J].Soil Dynamics and Earthquake Engineering,2006,26:909-921.
[3]Francisco C P,Barros,Enrique L.Amplification of Obliquely Incident Wavesby a Cylindrical Valley Embedded in a Layered Half-Space[J].Soil Dynamicsand Earthquake Engineering,1995,14:163-175.
[4]Seyyed M,Hasheminejad,Siavash.Dynamic Response of an EccentricallyLined Circular Tunnel in Poroelastic Soil Under Seismic Excitation[J].Soil Dy-namics and Earthquake Engineering,2008,28:277-292.
[5]Yang Jun.Influence of Water Saturation on Horizontal and Vertical Motion at aPorous Soil Interface Induced by Incident P Wave[J].Soil Dynamics andEarthquake Engineering,2000,19:575-581.
[6]张军伟,梅志荣,高菊茹,等.大伙房输水工程特长隧洞TBM选型及施工关键技术研究[J].现代隧道技术,2010(5):1-10.
[7]赵洋,卢玲.大伙房输水隧洞混凝土衬砌层的地震响应分析[J].现代隧道技术,2011(3):40-45.
[8]张鸿,毕继红,张伟.地铁隧道地震反应非线性分析[J].地震工程与工程振动,2004,24(6):146-153.
[9]范鹏贤,王明洋,李文培.岩土介质中圆形隧洞围岩压力理论分析进展[J].现代隧道技术,2010(2):1-7.
[10]翟贺,李鹏程,李志明,等.地震行波作用下的埋地管线最大地震反应探讨[J].特种结构,2007,24(3):1-3.
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