响嘡钻井台阵场地土体动力特性反演分析
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摘要
为了认识响嘡真实地震动下土体动力特征,分析场地响应,以及检验和提高工程钻探方法、现场测试及土工试验的精度,通过层转换矩阵永为实矩阵的成层场地地震反应分析,结合遗传算法-单纯形法这一全局-局部混合优化方法,进行了同时考虑SH、P和SV波型的多分量实际波形的反演拟合.最后给出了响嘡钻井台阵(2#)3次中小地震反演结果,并提供了以往研究中没有涉及的纵波波速值、阻尼比值及与频率有关的阻尼频率因子b值.结果表明,反演的响嘡2#钻井台阵剪切波速值大于1994年单孔原位波速测试结果,而更接近于距其200多米的3#的剪切波速结果;并发现在峰值加速度60×10-2m/s2量级的地震作用中就存在反演可以察觉的土体非线性.另外,该方法亦可用于其它钻井台阵的研究和分析.
In order to understand the site soil response of the Xiangtang borehole seismic array under real strong ground motion, reveal the site response, verify the technique of borehole exploration, and improve the precision of in-situ test and laboratory test, this paper presents a new approach, which is composed of two methods. One is the layered site seismic response method, whose layer transform matrix is always real. The other is a global-local optimization technique, which uses genetic algorithm (GA)-simplex method. An inversion of multi-component waveforms of P, SV and SH wave is carried out simultaneously. By inverting the records of three moderate and small earthquakes obtained from the Xiangtang borehole array (2# ) site, the soil dynamic characteristic parameters, including P velocity, damping ratio and frequency-dependent coefficient b, which has not been given in previous literatures, are calculated. The results show that the soil S wave velocity of the Xiangtang 2# borehole is generally greater than that obtained from the 1994 in-situ test, and is close to the velocity of the 3# borehole, which is more than 200 m away from the 2# borehole. Meanwhile, perceptible soil nonlinear behavior under peak ground motion of about 60×10-2 m/s2 is detected by the inversion analysis. The presented method can be used for studying the soil response of other borehole array sites.
In order to understand the site soil response of the Xiangtang borehole seismic array under real strong ground motion, reveal the site response, verify the technique of borehole exploration, and improve the precision of in-situ test and laboratory test, this paper presents a new approach, which is composed of two methods. One is the layered site seismic response method, whose layer transform matrix is always real. The other is a global-local optimization technique, which uses genetic algorithm (GA)-simplex method. An inversion of multi-component waveforms of P, SV and SH wave is carried out simultaneously. By inverting the records of three moderate and small earthquakes obtained from the Xiangtang borehole array (2# ) site, the soil dynamic characteristic parameters, including P velocity, damping ratio and frequency-dependent coefficient b, which has not been given in previous literatures, are calculated. The results show that the soil S wave velocity of the Xiangtang 2# borehole is generally greater than that obtained from the 1994 in-situ test, and is close to the velocity of the 3# borehole, which is more than 200 m away from the 2# borehole. Meanwhile, perceptible soil nonlinear behavior under peak ground motion of about 60×10-2 m/s2 is detected by the inversion analysis. The presented method can be used for studying the soil response of other borehole array sites.
引文
[1]谢礼立,周雍年,章文波,等.2001.唐山响嘡局部场地条件对地震动影响观测台阵扩建和改造.中国地震局工程力学研究所.1-47.
[1]谢礼立,周雍年,章文波,等.2001.唐山响嘡局部场地条件对地震动影响观测台阵扩建和改造.中国地震局工程力学研究所.1-47.
陈运泰.1974a.多层弹性半空间中的地震波(一)[J].地球物理学报,17(1):20-43.
陈运泰.1974b.多层弹性半空间中的地震波(二)[J].地球物理学报,17(3):173-184.
韩炜.2000.一种全局—局部优化算法及其在桩基承载力反演中的应用[D]:[学位论文].哈尔滨:中国地震局工程力学研究所:15-38.
谢礼立,李沙白,章文波.1999.唐山响嘡三维场地影响观测台阵[J].地震工程与工程振动,19(2):1-8.
Haskell N A.1953.The dispersion of surface waves on multilayered media[J].Bull Seism Soc Amer,43(1):17-34.
Holland J H.1975.Adaptationin Nature and Artificial Systems[M].Michigan:The University of Michigan Press:1-257.
Ikemoto T,Miyaji ma M,Kitaura M.2000.Inverse analysis of dynamic soil parameters using acceleration records[C/CD]∥12th World Conference on Earthquake Engineering.Anckland,New Zealand:New Zealand Society for Earth-quake Engineering.1794:1-6.
Knopoff L.1964.A matrix method for elastic wave problems[J].Bull Seism Soc Amer,54(2):431-438.
Spendley W,Hext G R,Hi msworth F R.1962.Sequential application of si mplex designsin opti mization and evolutionaryoperation[J].Technometrics,4(4):441-461.
Satoh T,Horike M,Takeuchi Y,et al.1997.Non-linear behavior of scoria evaluated from borehole records in easternShizuoka prefecture,Japan[J].Earthq Eng Struc Dyn,26:781-795.
Satoh T,Fushi mi M,Tatsumi Y.2001.Inversion of strain-dependent nonlinear characteristics of soils using weak andstrong motions observed by borehole sites in Japan[J].Bull Seism Soc Amer,91(2):365-380.
Thomson WT.1950.Transmission of elastic waves through a stratified solid medium[J].J Appl Phys,21(1):89-93.
[1]谢礼立,周雍年,章文波,等.2001.唐山响嘡局部场地条件对地震动影响观测台阵扩建和改造.中国地震局工程力学研究所.1-47.
陈运泰.1974a.多层弹性半空间中的地震波(一)[J].地球物理学报,17(1):20-43.
陈运泰.1974b.多层弹性半空间中的地震波(二)[J].地球物理学报,17(3):173-184.
韩炜.2000.一种全局—局部优化算法及其在桩基承载力反演中的应用[D]:[学位论文].哈尔滨:中国地震局工程力学研究所:15-38.
谢礼立,李沙白,章文波.1999.唐山响嘡三维场地影响观测台阵[J].地震工程与工程振动,19(2):1-8.
Haskell N A.1953.The dispersion of surface waves on multilayered media[J].Bull Seism Soc Amer,43(1):17-34.
Holland J H.1975.Adaptationin Nature and Artificial Systems[M].Michigan:The University of Michigan Press:1-257.
Ikemoto T,Miyaji ma M,Kitaura M.2000.Inverse analysis of dynamic soil parameters using acceleration records[C/CD]∥12th World Conference on Earthquake Engineering.Anckland,New Zealand:New Zealand Society for Earth-quake Engineering.1794:1-6.
Knopoff L.1964.A matrix method for elastic wave problems[J].Bull Seism Soc Amer,54(2):431-438.
Spendley W,Hext G R,Hi msworth F R.1962.Sequential application of si mplex designsin opti mization and evolutionaryoperation[J].Technometrics,4(4):441-461.
Satoh T,Horike M,Takeuchi Y,et al.1997.Non-linear behavior of scoria evaluated from borehole records in easternShizuoka prefecture,Japan[J].Earthq Eng Struc Dyn,26:781-795.
Satoh T,Fushi mi M,Tatsumi Y.2001.Inversion of strain-dependent nonlinear characteristics of soils using weak andstrong motions observed by borehole sites in Japan[J].Bull Seism Soc Amer,91(2):365-380.
Thomson WT.1950.Transmission of elastic waves through a stratified solid medium[J].J Appl Phys,21(1):89-93.
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