湖南中强地震活动地区Ⅱ类场地放大效应研究
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摘要
利用工程场地地震安全性评价工作中大量实际钻孔和土工实验资料,建立了实际工程场地模型,在50年超越概率为63%、10%、2%共3种地震动输入下,采用SHAKE91和ELSSRA两种等效线性化方法,研究了湖南省Ⅱ类场地土层的放大效应。计算结果表明:湖南省50年超越概率10%的场地效应放大因子为1.30,若使用《中国地震动参数区划图(GB18306-2001)》认定的1.25系数,将低估湖南中强地震活动地区的场地放大效应。湖南省50年超越概率63%、10%、2%这3个设定水准的场地效应放大因子满足1.10∶1.00∶0.95的关系。这些结果有益于为湖南省提供更为合理的抗震设防标准。
Real models of engineering site are constructed on the basis of the quantitative data of real boreholes and soil tests in Safety Assessment Work. Under 63.2%, 10% and 2% exceedance probability in 50 years, amplification effects of Type II sites in Hunan Province are studied in detail by 2 equivalent linear seismic response methods, SHAKE91 and ELSSRA respectively. The results indicate that the amplification effect of Type II sites in Hunan Province on condition of 10% exceedance probability in 50 years is 1.30 against the previous coefficient 1.25 in National Standard "The Zonation Map of Earthquake Ground Motion Parameters in China (GB18306-2001)", which will underestimate site effects in moderate earthquake areas such as Hunan. 63.2%, 10% and 2% exceedance probability in 50 years in terms of amplification effects of Type II sites in Hunan accord with the relations at the levels of 1.10∶1.00∶0.95. All these results are helpful for more reasonable standards of engineering aseismic design in Hunan Province.
Real models of engineering site are constructed on the basis of the quantitative data of real boreholes and soil tests in Safety Assessment Work. Under 63.2%, 10% and 2% exceedance probability in 50 years, amplification effects of Type II sites in Hunan Province are studied in detail by 2 equivalent linear seismic response methods, SHAKE91 and ELSSRA respectively. The results indicate that the amplification effect of Type II sites in Hunan Province on condition of 10% exceedance probability in 50 years is 1.30 against the previous coefficient 1.25 in National Standard "The Zonation Map of Earthquake Ground Motion Parameters in China (GB18306-2001)", which will underestimate site effects in moderate earthquake areas such as Hunan. 63.2%, 10% and 2% exceedance probability in 50 years in terms of amplification effects of Type II sites in Hunan accord with the relations at the levels of 1.10∶1.00∶0.95. All these results are helpful for more reasonable standards of engineering aseismic design in Hunan Province.
引文
陈学良,2006,土体动力特性、复杂场地非线性地震反应及其方法研究,中国地震局工程力学研究所博士学位论文,哈尔滨。
高孟潭,2003,新的国家地震区划图,地震学报,25(6),630~636。
高孟潭、肖和平、燕为民等,2008,中强地震活动地区地震区划重要性及关键技术进展,震灾防御技术,3(1),1~7。
胡聿贤、高孟潭,2001,国家标准GB18306-2001“中国地震动参数区划图”宣贯教材,北京:中国标准出版社。
李小军、彭青,2001,不同类别场地地震动参数的计算分析,地震工程与工程振动,21(1),29~36。
廖振鹏、李小军,1989,地表土层地震反应的等效线性化解法,廖振鹏主编,地震小区划(理论与实践),北京:地震出版社。
张倩,2002,场地土层地震反应特征研究,中国地震局地球物理研究所硕士学位论文,北京。
Idriss,I.M.,Seed,H.B.,1968,Seismic response of horizontal soil layers,Soil Mechanics and Foundations Division,Proceedings ofASCE,94(4),1003~1031.
Idriss,I.M.,Sun,J.I.,1992·User s Manual for SHAKE91:Acomputer programfor conducting equivalent linear seismic responseanalyses of horizontallylayered soil deposits,University of California,Davis,California.
Ordonez,G.A.,2004,SHAKE2000:a Computer Programfor the1D Analysis of Geotechnical Earthquake Engineering Problems.User s Manual.306.
Schnabel,P.B.,Lysmer,J.,Seed,H.B.,1972,SHAKE-Acomputer.programfor earthquake response analysis of horizontallylayered sites,EERC Report72~12,University of California at Berkeley,USA.
Seed,H.B.,Idriss,I.M.,1969,Theinfluence of soil conditions on ground motions duringearthquake.Journal of the Soil mechanicsand Foundation Engineering Division,ASCE,94,93~137.
Study on Amplification Effect of TypeⅡArea of Hunan
高孟潭,2003,新的国家地震区划图,地震学报,25(6),630~636。
高孟潭、肖和平、燕为民等,2008,中强地震活动地区地震区划重要性及关键技术进展,震灾防御技术,3(1),1~7。
胡聿贤、高孟潭,2001,国家标准GB18306-2001“中国地震动参数区划图”宣贯教材,北京:中国标准出版社。
李小军、彭青,2001,不同类别场地地震动参数的计算分析,地震工程与工程振动,21(1),29~36。
廖振鹏、李小军,1989,地表土层地震反应的等效线性化解法,廖振鹏主编,地震小区划(理论与实践),北京:地震出版社。
张倩,2002,场地土层地震反应特征研究,中国地震局地球物理研究所硕士学位论文,北京。
Idriss,I.M.,Seed,H.B.,1968,Seismic response of horizontal soil layers,Soil Mechanics and Foundations Division,Proceedings ofASCE,94(4),1003~1031.
Idriss,I.M.,Sun,J.I.,1992·User s Manual for SHAKE91:Acomputer programfor conducting equivalent linear seismic responseanalyses of horizontallylayered soil deposits,University of California,Davis,California.
Ordonez,G.A.,2004,SHAKE2000:a Computer Programfor the1D Analysis of Geotechnical Earthquake Engineering Problems.User s Manual.306.
Schnabel,P.B.,Lysmer,J.,Seed,H.B.,1972,SHAKE-Acomputer.programfor earthquake response analysis of horizontallylayered sites,EERC Report72~12,University of California at Berkeley,USA.
Seed,H.B.,Idriss,I.M.,1969,Theinfluence of soil conditions on ground motions duringearthquake.Journal of the Soil mechanicsand Foundation Engineering Division,ASCE,94,93~137.
Study on Amplification Effect of TypeⅡArea of Hunan
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