软土地层中双圆盾构法隧道的抗震分析
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摘要
目前对于上海双圆盾构法隧道的抗震问题 ,尚没有成熟的方法可供利用。本文结合上海地区典型软土室内动力试验研究成果 ,采用考虑土 -结构相互作用的软土地层中地下建筑物抗震稳定分析方法 ,研究了隧道 -土体体系二维地震反应 ,并应用梁单元有限元模型研究了隧道的纵向地震反应。计算结果包括 :地震引起的隧道周围软土孔隙水应力比、震陷、动剪应力比 ,以及隧道结构的动剪应力、轴力、剪力、弯矩等。最终从地震影响角度对该隧道的优劣作了初步评价 ,为工程决策提供了重要参考依据 ,所得结论可为软土隧道抗震设计提供参考依据。
There is still no effective seismic solution for the DOT shield tunnel surrounded by soft soil in Shanghai at present. Based on the results of cyclic trail test and by FEM, the seismic analysis of DOT shield tunnel located in sandy soil and clay soil in Shanghai has been made. The 2D seismic response of the tunnel soil system has been studied through the seismic stability analysis and considering the soil structure interaction and the longitude seismic response of the tunnel calculated by a beam element model. The results include the dynamic stresses of subway stations and surrounding soil, the pore water pressure, settlement of surrounding soil, axial stress, moment and shear stress of tunnel, etc. The tunnel is assessed according to the seismic response. The result of the analysis provides the reference for the future seismic design of the tunnel surrounded by soft soil.
There is still no effective seismic solution for the DOT shield tunnel surrounded by soft soil in Shanghai at present. Based on the results of cyclic trail test and by FEM, the seismic analysis of DOT shield tunnel located in sandy soil and clay soil in Shanghai has been made. The 2D seismic response of the tunnel soil system has been studied through the seismic stability analysis and considering the soil structure interaction and the longitude seismic response of the tunnel calculated by a beam element model. The results include the dynamic stresses of subway stations and surrounding soil, the pore water pressure, settlement of surrounding soil, axial stress, moment and shear stress of tunnel, etc. The tunnel is assessed according to the seismic response. The result of the analysis provides the reference for the future seismic design of the tunnel surrounded by soft soil.
引文
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[4] 周健,董鹏,戚佩江.灰渣坝抗震稳定性的三维有效应力动力分析[J].水利学报,2000,(7).
[5] 周健,董鹏,池永.软土地下建筑物抗震分析[J].工程抗震,2000,(2).
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[8] 董鹏.《上海软土地下建筑抗震稳定性分析》[D],上海:同济大学博士论文,2002,3.
[9] 夏明耀,曾进伦.地下工程设计施工手册[M ].北京:中国建筑工业出版社,1997,7.
[10] 日本地盘工学会.シルド工法の调查.设计から施工まで,1997,74～75.
[2] TakashiMatsudaetc.Astudyondamageofunder groundsubwaystructuresduringthe1995hyogokennanbuearthquake.Geotechnicalengineeringinrecoveryfromurbanearthquakedisaster,KIG form’97.339～348.
[3] 周健,胡晓燕.上海软土地下建筑物抗震稳定性分析[J].同济大学学报,1998,(10):492～496.
[4] 周健,董鹏,戚佩江.灰渣坝抗震稳定性的三维有效应力动力分析[J].水利学报,2000,(7).
[5] 周健,董鹏,池永.软土地下建筑物抗震分析[J].工程抗震,2000,(2).
[6] DuncanJ .M .andChangC .Y .Non linearAnalysisofStressesandStraininSoil[J].Proc.ASCE .JSMFD ,1970,96(5):629～653.
[7] HardinB .D .andDrnevichV .P .ShearModulusandDampinginSoils:DesignEquationsandCurves,Jour.SoilMechanicsandFoundationsDivision[J],ASCE1972,98(7):667～692.
[8] 董鹏.《上海软土地下建筑抗震稳定性分析》[D],上海:同济大学博士论文,2002,3.
[9] 夏明耀,曾进伦.地下工程设计施工手册[M ].北京:中国建筑工业出版社,1997,7.
[10] 日本地盘工学会.シルド工法の调查.设计から施工まで,1997,74～75.
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