多年冻土场地路基地震加速度反应谱特性研究
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摘要
多年冻土场地路基及与之相关土工构筑物的抗震已成为以往研究不足、而目前道路建设中又必须尽快解决的重要工程问题之一。以在建的青藏铁路工程的抗震设计与地震加固为应用背景,基于若干种较为典型的冻土场地路基工况,采用非水平场地土体(土工结构物)地震反应分析的二维动力有限元法,分别输入El Centro波及天津波,开展多年冻土场地路基地震加速度反应谱的研究工作。研究表明,在高频El Centro波和低频天津波输入下,无论冻土层存在与否,路基地震加速度反应谱均主要表现为高频脉冲型,反映了路基的地震冲击型破坏作用;当输入高频El Centro波时,在中、低频段,含冻土层路基的地震加速度反应谱较不含冻土层路基的地震加速度反应谱大;而在低频天津波输入下,冻土层存在与否,对路基地震加速度反应谱的影响较小。与不同的场地地形条件相比,输入地震波频率的不同,对冻土路基地震加速度反应的影响更大,尤其是当存在融沉盆时更加剧了路基的地震加速度反应。
At present,the aseismic problem of roadbed and other relevant earth structure on permafrost site has become a key problem that is not studied sufficiently in the past and needs to be solved urgently. Based on several typical cases of roadbeds of Qinghai-Tibet Railway Project,the response spectrum characteristics of earthquake acceleration for roadbed on permafrost site are studied by using two-dimensional dynamic FEM. The high-frequency El Centro wave and low-frequency Tianjin wave are input as an excitation. The result indicates that whether there is frozen layer,earthquake acceleration response spectrum is mostly the type of high frequency impulse,and the soil failure is bump type. In the mid and low frequency stage,the values of earthquake acceleration response spectrum for roadbed with frozen soil are larger than that without frozen soil when input is El Centro wave. But for Tianjin wave,there is no significant difference. Compared to different topography conditions,the frequence of input earthquake wave has great influence on earthquake acceleration response spectrum of roadbed. Especially,the existence of thawed basin ground enhances the effect of earthquake acceleration response for roadbed.
At present,the aseismic problem of roadbed and other relevant earth structure on permafrost site has become a key problem that is not studied sufficiently in the past and needs to be solved urgently. Based on several typical cases of roadbeds of Qinghai-Tibet Railway Project,the response spectrum characteristics of earthquake acceleration for roadbed on permafrost site are studied by using two-dimensional dynamic FEM. The high-frequency El Centro wave and low-frequency Tianjin wave are input as an excitation. The result indicates that whether there is frozen layer,earthquake acceleration response spectrum is mostly the type of high frequency impulse,and the soil failure is bump type. In the mid and low frequency stage,the values of earthquake acceleration response spectrum for roadbed with frozen soil are larger than that without frozen soil when input is El Centro wave. But for Tianjin wave,there is no significant difference. Compared to different topography conditions,the frequence of input earthquake wave has great influence on earthquake acceleration response spectrum of roadbed. Especially,the existence of thawed basin ground enhances the effect of earthquake acceleration response for roadbed.
引文
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2程国栋,何平.多年冻土地区线性工程建设[J].冰川冻土,2001,23(3):213～217
3沈忠言,张家懿.振动荷载下冻土破坏要素的特点及单轴动强度模型[A].见:第五届全国冰川冻土学论文集(上)[C].兰州:甘肃文化出版社,1996,741～746
4胡聿贤.地震工程学[M].北京:地震出版社,1988
5张健明,朱元林,张家懿.动荷载下桩与冻土间冻强度试验研究[A].见:第五届全国冰川冻土学论文集(上)[C].兰州:甘肃文化出版社,1996,789～793
6吴紫汪,程国栋,朱林楠等.冻土路基工程[M].兰州:兰州大学出版社,1988,61～116
7马芹永,彭万巍,朱元林.冻结粘土纵、横波速与温度的关系[J].岩石力学与工程学报,2002,21(2):290～293
8Chaichan avongT.Dyn am icp rop erties ofic eandf rozenc layunder cyclict riaxialloadingco nditions[Ph.D.thesis][D].EastLansing:MichiganStateUn i v.,1976
9FinnWD L,YongRN .S eismic responseoffr oz enground[J].J.oftheGeotechnicalEngineeringDivision,ASCE,1978,104:1 2 25～124 1
10F innWDL,YongRN, Le eKW.Li quefac ti onofth awedlayersi nf rozensoils[J].J.oftheGeotechnicalEngineeringDivision,ASCE,1978,104:1243～125 5
11Sing hS,Donov an NC.Seismicres pons eoffrozen-thawedsoi lsystems[A].In:Proc. of6thWorldConferenceonEarthquakeEngineering[C].Meerut,India:SaritaPrakashan,1977,III:2262～2267
12谢君斐,石兆吉,郁寿松等.液化危害性分析[J].地震工程与工程振动,1988,8(1):65～75
13凌贤长,徐学燕,徐春华等.冻结哈尔滨粉质粘土超声波速测定试验研究[J].岩土工程学报,2002,24(4):456～459
14LingXianch ang,XuXueyan, QiuMingguo ,etal .U ltrason icexper imentstudy ondynam ic elasti cmech anicalindexesoff rozensiltyclay[A].In:Proc.o f5thInternationalSymposiumonPe rmafros tEngineering[C].[s.l.]:[s.n.],2002,38～42
15LiXi aozhi,XuX ue yan,Xu Chunhua .Thein fl uenceo ngro undseismic hazardoffrozensoilsh ear-wavevelocity[A].In:Proc .of5thInternationalSymposiumon Permafr ostEngineering[C].[s.l.]:[s.n.],2002,43～47
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