土动力参数变异性对深软场地地表地震动参数的影响
|
摘要
采用等效线性化技术考虑土的动力非线性特性,利用一维波传法及SHAKE91软件计算水平成层场地的地震反应,研究了土的动剪模量比和阻尼比与剪应变幅值的关系曲线、土层剪切波速的变异性对深软场地地表峰值加速度及其反应谱的影响。结果表明:土的动剪模量比均值加1倍标准差与阻尼比均值减1倍标准差、动剪模量比均值减1倍标准差与阻尼比均值加1倍标准差的组合对地表峰值加速度的影响最为显著,但对地表加速度反应谱形状的影响不大;土层剪切波速15%的变异性对地表加速度反应谱形状有较大影响;土层剪切波速的变异性对地表加速度和反应谱的影响比动剪模量比和阻尼比变异性的影响更为显著。
Considering nonlinear dynamic characteristics of soils by equivalent linearization method, site earthquake response analysis with horizontal-layered soil are analyzed on the basis of the one-dimensional wave motion model by SHAKE91 software, and we discussed the effects of the variability of soil dynamic parameters, including soil dynamic shear modulus ratio, damping ratio and shear velocity, on peak value of ground surface acceleration and its response spectra of deep soft sites. The conclusions are shown by using numerical results obtained from many case studies. The following combinations cause the most prominent effect on peak value of ground surface acceleration: the mean value of dynamic shear modulus ratio added by one standard deviation with the mean value of damping ratio reduced by one standard deviation; the mean value of dynamic shear module ratio reduced by one standard deviation with the mean value of damping ratio added by one standard deviation, but they cause negligible effect on the shape of the acceleration response spectra. And the 15% variability of shear velocity of strata makes more effect on the shape of the response spectra of ground surface acceleration. By comparison of calculation results, the variability of shear velocity of soil layers causes more prominent effect on the value of ground surface acceleration and its response spectra than the variability of dynamic shear modulus ratio and damping ratio do.
Considering nonlinear dynamic characteristics of soils by equivalent linearization method, site earthquake response analysis with horizontal-layered soil are analyzed on the basis of the one-dimensional wave motion model by SHAKE91 software, and we discussed the effects of the variability of soil dynamic parameters, including soil dynamic shear modulus ratio, damping ratio and shear velocity, on peak value of ground surface acceleration and its response spectra of deep soft sites. The conclusions are shown by using numerical results obtained from many case studies. The following combinations cause the most prominent effect on peak value of ground surface acceleration: the mean value of dynamic shear modulus ratio added by one standard deviation with the mean value of damping ratio reduced by one standard deviation; the mean value of dynamic shear module ratio reduced by one standard deviation with the mean value of damping ratio added by one standard deviation, but they cause negligible effect on the shape of the acceleration response spectra. And the 15% variability of shear velocity of strata makes more effect on the shape of the response spectra of ground surface acceleration. By comparison of calculation results, the variability of shear velocity of soil layers causes more prominent effect on the value of ground surface acceleration and its response spectra than the variability of dynamic shear modulus ratio and damping ratio do.
引文
[1]陈国兴,谢君斐,张克绪.土的动模量和阻尼比的经验估计[J].地震工程与工程振动,1995,(1):75-86Chen G X,Xie J F,Zhang K X.The empirical evalu-ation of soil modulus and damping ratio for dynamic analysis[J].Earthquake Engineering and Engineering Vibration,1995,(1):75-86
[2]袁晓铭,孙锐,孙静,等.常规土类动剪切模量和阻尼比的试验研究[J].地震工程与工程振动,2000,(4):133-139Yuan X M,Sun R,Sun J,et al.Laboratory experi-mental study on dynamic shear modulus ratio and damping ratio of soil[J].Earthquake Engineering and Engineering Vibration,2000,(4):133-139
[3]陈国兴,刘雪珠,朱定华,等.南京新近沉积土的动剪切模量和阻尼比试验研究[J].岩土工程学报,2006,(8):1023-1027Chen G X,Liu X Z,Zhu D H,et al.Experimental studies on dynamic shear modulus ratio and damping ratio of recently deposited soils in Nanjing[J].Chi-nese Journal of Geotechnical Engineering,2006,(8):1023-1027
[4]Seed,H.B.,Wong,R.T.,Idriss,I.M.,et al.Moduli and damping factors for dynamic analyses of cohesion-less soils[J].Journal of Geot.Eng.,ASCE,1986,(11):1016-1032
[5]Rollins,K.,Evans,M.D.,Diehl,N.B.,et al.Shearmodulus and damping relationships for gravels[J].Journal of Geotechnical And Geoenvironmental Eng.ASCE,1998,(5):396-405
[6]Kokusho,T.Cyclic triaxial test of dynamic soil prop-erties for wide strain range[J].Soils and Founda-tions,1980,(2):45-60
[7]Vucetic,M.,Dobry,R.Degradation of marine clays under cyclic loading[J].Journal of Geot.Eng.,AS-CE,1988,(2):133-149
[8]赵松戈,胡聿贤,廖旭.土层参数的随机性对场地传递函数的影响[J].地震工程与工程振动,2000,(2):7-12Zhao S G,Hu Y X,Liao X.Effect of soil parameter variations of soil transfer function[J].Earthquake Engineering and Engineering Vibration,2000,(2):7-12
[9]王绍博,丁海平.土动力参数对土层动力反应的影响[J].地震工程与工程振动,2001,(1):105-108Wang S B,Ding H P.Effect of soil dynamic parame-ters on seismic responses of soil layers[J].Earth-quake Engineering and Engineering Vibration,2001,(1):105-108
[10]石玉成,蔡红卫,徐晖平.场地地震反应分析中的不确定性及其处理方法[J].西北地震学报,1999,(3):242-247Shi Y C,Cai H W,Xu H P.Uncertainties in site earthquake response and the way of its processing[J].Northwest Seismological Journal,1999,(3):242-247
[11]楼梦麟,严国香,沈建文,等.上海软土动力参数变异性对土层地震反应的影响[J].岩土力学,2004,(9):1368-1372Lou M L,Yan G X,Shen J W,et al.Effect of vari-ability of dynamic parameters of soft soil in Shanghai region on seismic response of layered soil[J].Rock and Soil Mechanics,2004,(9):1368-1372
[12]刘红帅,薄景山,吴兆营,等.土体参数对地表加速度峰值和反应谱的影响[J].地震工程与工程振动,2005,(2):167-171Liu H S,Bo J S,Wu Z Y,et al.Effects of soil parame-ters on ground surface acceleration peak and response spectra[J].Journal of Seismological Research,2005,(2):167-171
[13]高玉峰,刘汉龙,朱伟,等.剪切波速对砂土层地震反应的影响[J].工程勘察,2001,(1):39-42Gao Y F,Liu H L,Zhu W,et al.Effects of shear wave velocity on seismic response of sand site[J].Geotechnical Investigation&Surveying,2001,(1):39-42
[2]袁晓铭,孙锐,孙静,等.常规土类动剪切模量和阻尼比的试验研究[J].地震工程与工程振动,2000,(4):133-139Yuan X M,Sun R,Sun J,et al.Laboratory experi-mental study on dynamic shear modulus ratio and damping ratio of soil[J].Earthquake Engineering and Engineering Vibration,2000,(4):133-139
[3]陈国兴,刘雪珠,朱定华,等.南京新近沉积土的动剪切模量和阻尼比试验研究[J].岩土工程学报,2006,(8):1023-1027Chen G X,Liu X Z,Zhu D H,et al.Experimental studies on dynamic shear modulus ratio and damping ratio of recently deposited soils in Nanjing[J].Chi-nese Journal of Geotechnical Engineering,2006,(8):1023-1027
[4]Seed,H.B.,Wong,R.T.,Idriss,I.M.,et al.Moduli and damping factors for dynamic analyses of cohesion-less soils[J].Journal of Geot.Eng.,ASCE,1986,(11):1016-1032
[5]Rollins,K.,Evans,M.D.,Diehl,N.B.,et al.Shearmodulus and damping relationships for gravels[J].Journal of Geotechnical And Geoenvironmental Eng.ASCE,1998,(5):396-405
[6]Kokusho,T.Cyclic triaxial test of dynamic soil prop-erties for wide strain range[J].Soils and Founda-tions,1980,(2):45-60
[7]Vucetic,M.,Dobry,R.Degradation of marine clays under cyclic loading[J].Journal of Geot.Eng.,AS-CE,1988,(2):133-149
[8]赵松戈,胡聿贤,廖旭.土层参数的随机性对场地传递函数的影响[J].地震工程与工程振动,2000,(2):7-12Zhao S G,Hu Y X,Liao X.Effect of soil parameter variations of soil transfer function[J].Earthquake Engineering and Engineering Vibration,2000,(2):7-12
[9]王绍博,丁海平.土动力参数对土层动力反应的影响[J].地震工程与工程振动,2001,(1):105-108Wang S B,Ding H P.Effect of soil dynamic parame-ters on seismic responses of soil layers[J].Earth-quake Engineering and Engineering Vibration,2001,(1):105-108
[10]石玉成,蔡红卫,徐晖平.场地地震反应分析中的不确定性及其处理方法[J].西北地震学报,1999,(3):242-247Shi Y C,Cai H W,Xu H P.Uncertainties in site earthquake response and the way of its processing[J].Northwest Seismological Journal,1999,(3):242-247
[11]楼梦麟,严国香,沈建文,等.上海软土动力参数变异性对土层地震反应的影响[J].岩土力学,2004,(9):1368-1372Lou M L,Yan G X,Shen J W,et al.Effect of vari-ability of dynamic parameters of soft soil in Shanghai region on seismic response of layered soil[J].Rock and Soil Mechanics,2004,(9):1368-1372
[12]刘红帅,薄景山,吴兆营,等.土体参数对地表加速度峰值和反应谱的影响[J].地震工程与工程振动,2005,(2):167-171Liu H S,Bo J S,Wu Z Y,et al.Effects of soil parame-ters on ground surface acceleration peak and response spectra[J].Journal of Seismological Research,2005,(2):167-171
[13]高玉峰,刘汉龙,朱伟,等.剪切波速对砂土层地震反应的影响[J].工程勘察,2001,(1):39-42Gao Y F,Liu H L,Zhu W,et al.Effects of shear wave velocity on seismic response of sand site[J].Geotechnical Investigation&Surveying,2001,(1):39-42
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心