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首页> 外文期刊>Bulletin of earthquake engineering >Evaluation of liquefaction potential in an intermountain Quaternary lacustrine basin (Fucino basin, central Italy)
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Evaluation of liquefaction potential in an intermountain Quaternary lacustrine basin (Fucino basin, central Italy)

机译：在国际山脉宽容湖泊中的液化潜力评估（意大利中部FUCINO盆地）

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In this study, we analyse the susceptibility to liquefaction of the Pozzone site, which is located on the northern side of the Fucino lacustrine basin in central Italy. In 1915, this region was struck by a M 7.0 earthquake, which produced widespread coseismic surface effects that were interpreted to be liquefaction-related. However, the interpretation of these phenomena at the Pozzone site is not straightforward. Furthermore, the site is characterized by an abundance of fine-grained sediments, which are not typically found in liquefiable soils. Therefore, in this study, we perform a number of detailed stratigraphic and geotechnical investigations (including continuous-coring borehole, CPTu, SDMT, SPT, and geotechnical laboratory tests) to better interpret these 1915 phenomena and to evaluate the liquefaction potential of a lacustrine environment dominated by fine-grained sedimentation. The upper 18.5 m of the stratigraphic succession comprises fine-grained sediments, including four strata of coarser sediments formed by interbedded layers of sand, silty sand and sandy silt. These strata, which are interpreted to represent the frontal lobes of an alluvial fan system within a lacustrine succession, are highly susceptible to liquefaction. We also find evidence of paleo-liquefaction, dated between 12.1-10.8 and 9.43-9.13 kyrs ago, occurring at depths of 2.1-2.3 m. These data, along with the aforementioned geotechnical analyses, indicate that this site would indeed be liquefiable in a 1915-like earthquake. Although we found a broad agreement among CPTu, DMT and shear wave velocity "simplified procedures" in detecting the liquefaction potential of the Pozzone soil, our results suggest that the use and comparison of different in situ techniques are highly recommended for reliable estimates of the cyclic liquefaction resistance in lacustrine sites characterized by high content of fine-grained soils. In geologic environments similar to the one analysed in this work, where it
机译：在这项研究中，我们分析了对大气局部液化的液化易感性，该网站位于意大利中部的Fucino Lapustine盆地的北侧。 1915年，该地区被M 7.0的地震击中，其产生了广泛的皮麻效应，被解释为液化相关。然而，在Pozzone网站上对这些现象的解释并不简单。此外，该部位的特征在于丰富的细粒沉积物，其通常通常在液化土中发现。因此，在这项研究中，我们执行许多详细的地层和岩土性研究（包括连续上衣钻孔，CPTU，SDMT，SPT和岩土实验室测试），以更好地解释这些1915个现象，并评估湖水环境的液化潜力以细粒度的沉降为主。地层继承的上部18.5米包括细粒沉积物，包括由夹层，粉状沙子和砂质淤泥层形成的较粗沉积物的四个层。这些层被解释为在湖泊连续中代表冲积风扇系统的正面叶片，高度易于液化。我们还发现古液化的证据，在12.1-10.8和9.43-9.13 kyrs前进行，在2.1-2.3米的深度发生。这些数据以及上述岩土学分析表明，该网站确实在1915年的地震中确实是液化。虽然我们发现CPTU，DMT和剪切波速“简化程序”中的广泛一致，但我们的结果表明，强烈建议对循环的可靠估计来使用和比较。宽度含量的细粒土的液化位点中的液化抗性。在类似于在这项工作中分析的地质环境中的地质环境

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