The Response of Sandy and Clayey Soils to Weak and Strong Seismic Motions

IF 0.9 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Izvestiya, Physics of the Solid Earth Pub Date : 2023-08-06 DOI:10.1134/S1069351323040043

E. V. Deshcherevskaya, O. V. Pavlenko

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Abstract—The response of sandy and clay subsurface soils, representing classes of non-cohesive and cohesive soils, during seismic motion of various intensities is analyzed based on the in situ observations—records by seismic vertical arrays of the Japanese strong motion network KiK-net. From a total of ~800 stations, five stations with sandy and five stations with clayey subsurface soils represented in the upper layers in their purest forms were selected for the analysis. For sandy and clayey stations, models of soil behavior during strong motion were constructed by the method of (Pavlenko and Irikura, 2003), showing vertical distributions of stresses and strains induced by strong motion in soil layers; and the behaviors were compared. Similar estimates of the amplification of seismic waves in sands and clays during weak motions and similar stress-strain relations describing the behavior of subsurface soils during moderate seismic motions are obtained. The liquefaction of sandy soils during strong motions (the 2011 Tohoku earthquake, Mw ~ 9.0) and the effects of extended seismic source (the directivity of seismic radiation) on the behavior of sandy and clayey soils and amplification of seismic waves are analyzed. Differences in the behavior of sandy and clayey soils are observed only during strong motions, namely, liquefaction occurs in sandy soils (when the groundwater level is about several meters from the surface), but never in clayey soils.

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砂土和粘性土对弱、强地震运动的响应

摘要基于日本强震台网KiK-net地震垂直阵列的现场观测记录，分析了非粘性土和粘性土两类砂质和粘土地下土在不同烈度地震运动中的响应。从总共约800个站点中，选择了5个沙质站点和5个粘土站点进行分析，这些站点在上层表现出最纯净的形式。对于沙质和粘土站，采用(Pavlenko和Irikura, 2003)的方法建立了强运动时土壤行为模型，显示了土层中强运动引起的应力和应变的垂直分布;并对其行为进行比较。在弱地震运动中，地震波在砂土和粘土中的放大也得到了类似的估计，在中等地震运动中，描述地下土壤行为的应力-应变关系也得到了类似的估计。分析了强运动(2011年日本东北地震，Mw ~ 9.0)中砂土的液化过程，以及扩展震源(地震辐射指向性)对砂土和粘性土特性和地震波放大的影响。砂质土和粘性土的行为差异只在强运动中观察到，即，液化发生在砂质土中(当地下水位离地表约几米时)，但在粘性土中从未发生过。

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来源期刊

Izvestiya, Physics of the Solid Earth 地学-地球化学与地球物理

CiteScore

1.60

自引率

30.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Izvestiya, Physics of the Solid Earth is an international peer reviewed journal that publishes results of original theoretical and experimental research in relevant areas of the physics of the Earth''s interior and applied geophysics. The journal welcomes manuscripts from all countries in the English or Russian language.