自贡西山公园山脊地形场地效应分析
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摘要
利用自贡地形影响台阵在2008年汶川地震中获得的主震强震记录,采用水平/垂直谱比法(HVSR)对该山脊地形场地对地震动的放大效应进行了分析,并探讨了所获记录结果的可靠性;采用显式有限元-有限差分法结合局部透射人工边界的二维场地影响分析模型与方法,模拟了该场地的地震动响应。对模拟结果与HVSR法分析结果进行对比分析,表明数值模拟结果与观测记录分析结果具有较好的一致性,利用数值计算方法建立的简单二维分析模型基本上可以反映山脊地形对地震动的影响。
Based on strong ground motion accelerations recorded with a topographical effect observation array in Xishan Park of Zigong City for the mainshock of Wenchuan earthquake,2008,the amplification effects of the mountain ridge topography on the ground motion were studied with the horizontal-to-vertical spectral ratio(HVSR) method,and the reliability of the results was discussed.The strong motion accelerations of the site were also simulated with a two-dimensional site model and analysis method,adopting the explicit finite element-finite deference method and local transmitting boundary.The comparison between the simulated results and those with HVSR method indicated that the simulated results agree well with the observation data,and the simple two-dimensional site model is suitable for simulating the topographical effects on ground motions.
Based on strong ground motion accelerations recorded with a topographical effect observation array in Xishan Park of Zigong City for the mainshock of Wenchuan earthquake,2008,the amplification effects of the mountain ridge topography on the ground motion were studied with the horizontal-to-vertical spectral ratio(HVSR) method,and the reliability of the results was discussed.The strong motion accelerations of the site were also simulated with a two-dimensional site model and analysis method,adopting the explicit finite element-finite deference method and local transmitting boundary.The comparison between the simulated results and those with HVSR method indicated that the simulated results agree well with the observation data,and the simple two-dimensional site model is suitable for simulating the topographical effects on ground motions.
引文
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[3]Bindi D,Parolai S,Enotarpi M,et al.Microtremor H/Vspectral ratio in two sediment-filled valleys in western Liguria(Italy)[J].Bolletino di Geofisica Teorica e Applicata,2001,42(3-4):305-315.
[4]梁建文,尤红兵,Lee V W.Scattering of SV waves by acanyon in a fluid-saturated,poroelastic layered half space[J].Soil Dyn Earthq Eng,2006,26:611-625.
[5]梁建文,巴振宁.弹性层状半空间中凸起地形对入射平面SH波的放大作用[J],地震工程与工程振动,2008,28(1):1-10.
[6]李小军,廖振鹏,关慧敏.粘弹性场地地形对地震动影响分析的显式有限元-有限差分方法[J].地震学报,1995,17(3):362-369.
[7]Nogoshi M,Igarashi T.On the propagation characteristicsestimation of subsurface using microtremors on the groundsurface[J].Seism.Soc.,1970,23:264-280.
[8]Nakamura Y.A method for dynamic characteristicsestimations of subsurface using microtremors on the groundsurface[J].Quart.Rep.Railway Tech.Res.Inst.(RTRI),1989,30(1):25-33.
[9]Lermo J,Chavez G F J.Are microtremors useful in siteresponse e valuation?[J].Bull.Seism.Soc.Am.,1994,84(1):1350-1364.
[10]Lachet C,Bard P Y.Numerical and theoretical investigationson the possibilities and limitations of Nakamura's technique[J].Phys.Earth,1994,42:377-397.
[11]Field E H,Jacob K H.A comparison and test of various site-response estimation techniques,including three that are notreference-site dependent[J].Bull.Seism.Soc.Am.,1995,85(1):1127-1143.
[12]Konno K,Ohmachi T.Ground motion characteristicsestimated from spectral ratio between horizontal and verticalcomponents of microtremor[J].Bull.Seism.Soc.Am.,1998,88(1):228-241.
[13]廖振鹏.近场波动问题的有限元解法[J].地震工程与工程震动,1984,4(2):1-14.
[14]廖振鹏,刘晶波.离散网格中的弹性波动(Ⅰ)[J].地震工程与工程震动,1986,6(2):1-16.
[15]廖振鹏,刘晶波.离散网格中的弹性波动(Ⅱ)[J].地震工程与工程震动,1989,9(2):1-11.
[16]李小军,廖振鹏,杜修力.有阻尼体系动力问题的一种显式差分解法[J].地震工程与工程震动,1992,12(4):74-80.
[17]廖振鹏,黄孔亮,杨柏坡,等.暂态波分析的透射边界条件[J],地震工程与工程震动,1989,9(2):1-11.
[18]廖振鹏,黄孔亮.透射边界的一个推广[J],科学通报,1984,29(5):312-313.
[19]廖振鹏.法向透射边界条件[J],中国科学(E),1996,26(2):187-192.
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