地铁列车振动荷载引起的隧道动力响应分析
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摘要
已开通运营地铁工程长期承受地铁列车振动荷载的影响,会造成地表不均匀沉降,管片结构附加应力增大,地表振动频率过大易出现城市环境振动污染,影响居民正常生活。以某运营城际铁路为工程依托,采用人工数定激振力函数模拟地铁列车振动荷载,建立了地铁列车振动荷载下隧道动力响应分析模型,对隧道管片结构弯矩及上部地层竖向位移进行监测分析,将地表竖向位移振动加速度换算为等效声级,结合城市环境振动标准,可知列车行驶过程中,地表振动环境污染符合城市环境振动标准规定的限值。
The metro engineering going into operation is bearing subway train vibration loads for a long term,causing differential settlement of ground surface and increased additional stress on segments. The excessive vibration frequency of the ground surface is easy to cause urban environmental pollution which influences the normal life of residents. Based on an operational interurban railway project,the train vibration load was simulated by artificially deterministic exciting force function. The numerical model for dynamic response analysis of the tunnel under subway train vibration load was established. During the calculation,the bending moment of the segment and vertical displacement of upper stratum were monitored and analyzed. By transforming the vibration acceleration of the vertical displacement to the equivalent sound level,we can know that environmental pollution by surface vibration accords with the limit requirement specified in vibration standard of urban environment.
The metro engineering going into operation is bearing subway train vibration loads for a long term,causing differential settlement of ground surface and increased additional stress on segments. The excessive vibration frequency of the ground surface is easy to cause urban environmental pollution which influences the normal life of residents. Based on an operational interurban railway project,the train vibration load was simulated by artificially deterministic exciting force function. The numerical model for dynamic response analysis of the tunnel under subway train vibration load was established. During the calculation,the bending moment of the segment and vertical displacement of upper stratum were monitored and analyzed. By transforming the vibration acceleration of the vertical displacement to the equivalent sound level,we can know that environmental pollution by surface vibration accords with the limit requirement specified in vibration standard of urban environment.
引文
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[2]曹新文,蔡英.铁路路基动态特性的模型试验研究[J].西南交通大学学报,1996,31(1):36-41.CAO X W,CAI Y.A model test study of the dynamic performance of subgrades[J].Journal of Southwest Jiaotong University,1996,31(1):36-41.
[3]Monismith C L,Ogawa N,Freeme C R.Permanent deformation characteristics of subgrade soils due to repeated loading[C]∥Proceedings of the 54th annual meeting of the transportation research board.Washington DC:Transportation Research Board,1975:1-17.
[4]LI D Q,Selig E T.Cumulative plastic deformation for fine-grained subgrade soils[J].Journal of Geotechnical Engineering,1996,122(12):1006-1013.
[5]CHAI JC,Miura N.Traffic-load-induced permanent deformation of road on soft subsoil[J].Journal of Geotechnical and Geoenvironmental Engineering,2002,128(11):907-916.
[6]Hyodo M,Yasuhara K,Hirao K.Prediction of clay behavior in undrained and partially drained cyclic triaxialtests[J].Journal of the Japanese Society of Soil Mechanics and Foundation Engineering,1992,32(4):117-127.
[7]Hyodo M,Yamamoto Y,Sugiyama M.Undrained cyclic shear behaviour of normally consolidated clay subjected to initial static shear stress[J].Soils and Foundations,1994,34(4):1-11.
[8]周健,屠洪权,安原一哉.动力荷载作用下软粘土的残余变形计算模式[J].岩土力学,1996,17(1):54-60.ZHOU J,TU H Q,Yaswhara K.A model for predicting the cyclic behaviour of soft clay[J].Rock and Soil Mechanics,1996,17(1):54-60.
[9]Kaynia A M,Madshus C,Zackrisson P.Ground vibration from high-speed trains:prediction and countermeasure[J].Journal of Geotechnical and Geoenvironmental Engineering,2000,126(6):531-537.
[10]王祥秋,杨林德,周治国.列车振动荷载作用下隧道衬砌结构动力响应特性分析[J].岩石力学与工程学报,2006,25(7):1337-1342.WANG X Q,YANG L D,ZHOU Z G.Dynamic response analysis of lining structure for tunnel under vibration loads of train[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(7):1337-1342.
[11]潘昌实,Pande G N.黄土隧道列车动荷载响应有限元初步数定分析研究[J].土木工程学报,1984,17(4):18-28.PAN C S,Pande G N.Preliminary deterministic finite element study on a tunnel driven in loess subjected to train loading[J].China Civil Engineering Journal,1984,17(4):18-28.