中等强度地震下季冻区场地响应影响研究
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摘要
用一维等效线性化程序对二类和三类季节性冻土场地的响应进行计算,给出多种工况下的地表反应谱。通过改变冻土的厚度,冻土的剪切波速,场地的动剪切模量比,研究不同参数对季冻区场地地震响应的影响。研究表明,季节性冻土对地震响应有影响仅是偏于一类的二类场地(1号场地)。与常温状态相比,该场地中反应谱峰值最大上升约1/4,地表最大加速度增大约20%。其余场地的季节性冻土影响均可以忽略。在1号场地当中,冻土剪切波速对峰值加速度的影响较大,冻深对峰值加速度有一定影响。无论何种场地,冻土动剪切模量比的变化对地震响应影响均可以忽略。
By using one-dimensional equivalent linear program,this article calculated class 2 and class 3 seasonal frozen ground response spectrums,and gave out spectrums under 95 operating conditions. By changing the thickness of the permafrost,the frozen soil shear wave velocity,and the venue of the dynamic shear modulus ratio,the author studied the impact of different parameters on the seismic response of seasonal frozen area venues. The analysis in this article showed that only site 1 impacted by the seasonal frozen soil. Although the site 1 had been called class 2 site,but the characters of that were more like class 1 site. Compared to that in normal temperature condition,the peak of response spectrum rise about 1 /4 and the peak ground acceleration rise of about 20%. The impact of seasonally frozen soil of other venues can be ignored. In site 1,the permafrost shear wave velocity is the one of the most important influence factor. Also the thickness of permafrost has some impact of the peak acceleration. No matter what kind of the venues in this passage,permafrost dynamic shear modulus ratio has no impact to the seismic response.
By using one-dimensional equivalent linear program,this article calculated class 2 and class 3 seasonal frozen ground response spectrums,and gave out spectrums under 95 operating conditions. By changing the thickness of the permafrost,the frozen soil shear wave velocity,and the venue of the dynamic shear modulus ratio,the author studied the impact of different parameters on the seismic response of seasonal frozen area venues. The analysis in this article showed that only site 1 impacted by the seasonal frozen soil. Although the site 1 had been called class 2 site,but the characters of that were more like class 1 site. Compared to that in normal temperature condition,the peak of response spectrum rise about 1 /4 and the peak ground acceleration rise of about 20%. The impact of seasonally frozen soil of other venues can be ignored. In site 1,the permafrost shear wave velocity is the one of the most important influence factor. Also the thickness of permafrost has some impact of the peak acceleration. No matter what kind of the venues in this passage,permafrost dynamic shear modulus ratio has no impact to the seismic response.
引文
[1]郭德明.1986年德都地震影响场及地震地质条件初步分析[J].东北地震研究,1987,3(1):47-58
[2]徐学燕,徐春华,李晓稚.冻土场地地震加速度反应谱研究[J].岩土工程学报,2003,25(6):679-683(Xu Xueyan,Xu Chunhua,Li Xiaozhi.Research on earthquake acceleration response spectrum of frozen soil ground[J].Chinese Journal of Geotechnical Engineering,2003,25(6):679-683(in Chinese))
[3]王丽霞,凌贤长,徐学燕,等.多年冻土场地路基地震加速度反应谱特性研究[J].岩石力学与工程学报,2004,23(8):59-68(Wang Lixia,Ling Xianzhang,Xu Xueyan,et al.Study on response spectrum characteristics of earthquake acceleration for roadbed on permafrost site[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(8):59-68(in Chinese))
[4]高峰,陈兴冲,严松宏.季节性冻土和多年冻土对场地地震反应的影响[J].岩石力学与工程学报,2006,25(8):62-69(Gao Feng,Chen Xingchong,Yan Songhong.Influence of permafrost and seasonally frozen soil on seismic responses of sites[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(8):62-69(in Chinese))
[5]杨柏坡,孙平善,申杰.有冻土层场地上多层砖房的震害预测方法[J].地震工程与工程振动,1999,6(2):88-97(Yang Baipo,Sun Pingshan,Shen Jie.Method of damage prediction for multi-storeyed brick building on the site with frozen layer[J].Earthquake Engineering and Engineering Vibration,1999,6(2):88-97(in Chinese))
[6]孙建刚,王莉莉,魏志真.季节性冻土层对立式储罐地震反应的影响[J].世界地震工程,2003,19(4):55-59(Sun Jiangang,Wang Lili,Wei Zhizhen.Influence of seasonally frozen ground on the seismic response of tanks[J].World Earthquake Engineering,2003,19(4):55-59(in Chinese))
[7]Chjwberlain E,Groves C,Perham J.The mechanical behavior of frozen earth materials under high pressure triaxial test conditions[J].Geotechnique,1972,22(3):469-483
[8]Erik S C.Janoo V,Ulf I.Resilient properties of unbound road materials during seasonal frost conditions[J].Journal of Cold Regions Engineering,2002,16(1):28-50
[9]Muravskiin G B.Application of experimental results on cyclic deforming of soils to seismic response analysis[J].Soil Dynamics and Earthquake Engineering,2001,21:661-669
[10]李小军.一维土层地震反应线性化计算程序[M]//地震小区划(理论与实践).北京:地震出版社,1989
[11]汪恩良,孙景路,高占坤,等.哈尔滨地区季节冻深理论公式修正系数的确定[C]//第八届国际冻土工程会议论文集.北京:中国建筑工业出版社,2009:338-343
[2]徐学燕,徐春华,李晓稚.冻土场地地震加速度反应谱研究[J].岩土工程学报,2003,25(6):679-683(Xu Xueyan,Xu Chunhua,Li Xiaozhi.Research on earthquake acceleration response spectrum of frozen soil ground[J].Chinese Journal of Geotechnical Engineering,2003,25(6):679-683(in Chinese))
[3]王丽霞,凌贤长,徐学燕,等.多年冻土场地路基地震加速度反应谱特性研究[J].岩石力学与工程学报,2004,23(8):59-68(Wang Lixia,Ling Xianzhang,Xu Xueyan,et al.Study on response spectrum characteristics of earthquake acceleration for roadbed on permafrost site[J].Chinese Journal of Rock Mechanics and Engineering,2004,23(8):59-68(in Chinese))
[4]高峰,陈兴冲,严松宏.季节性冻土和多年冻土对场地地震反应的影响[J].岩石力学与工程学报,2006,25(8):62-69(Gao Feng,Chen Xingchong,Yan Songhong.Influence of permafrost and seasonally frozen soil on seismic responses of sites[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(8):62-69(in Chinese))
[5]杨柏坡,孙平善,申杰.有冻土层场地上多层砖房的震害预测方法[J].地震工程与工程振动,1999,6(2):88-97(Yang Baipo,Sun Pingshan,Shen Jie.Method of damage prediction for multi-storeyed brick building on the site with frozen layer[J].Earthquake Engineering and Engineering Vibration,1999,6(2):88-97(in Chinese))
[6]孙建刚,王莉莉,魏志真.季节性冻土层对立式储罐地震反应的影响[J].世界地震工程,2003,19(4):55-59(Sun Jiangang,Wang Lili,Wei Zhizhen.Influence of seasonally frozen ground on the seismic response of tanks[J].World Earthquake Engineering,2003,19(4):55-59(in Chinese))
[7]Chjwberlain E,Groves C,Perham J.The mechanical behavior of frozen earth materials under high pressure triaxial test conditions[J].Geotechnique,1972,22(3):469-483
[8]Erik S C.Janoo V,Ulf I.Resilient properties of unbound road materials during seasonal frost conditions[J].Journal of Cold Regions Engineering,2002,16(1):28-50
[9]Muravskiin G B.Application of experimental results on cyclic deforming of soils to seismic response analysis[J].Soil Dynamics and Earthquake Engineering,2001,21:661-669
[10]李小军.一维土层地震反应线性化计算程序[M]//地震小区划(理论与实践).北京:地震出版社,1989
[11]汪恩良,孙景路,高占坤,等.哈尔滨地区季节冻深理论公式修正系数的确定[C]//第八届国际冻土工程会议论文集.北京:中国建筑工业出版社,2009:338-343
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