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首页> 外文期刊>Bulletin of earthquake engineering >Dynamic characterization of soils and soft rocks of the Central Archeological Area of Rome
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Dynamic characterization of soils and soft rocks of the Central Archeological Area of Rome

机译：罗马中央考古区土壤和软岩的动态表征

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摘要

The paper presents the results of in-situ and laboratory tests aimed at defining the cyclic properties of soils and soft rocks of the Central Archeological Area of Rome in the framework of the seismic microzonation study of the area. The small-strain shear modulus G_0 (or analogously shear wave velocity V_S) and the curves expressing shear modulus G and damping ratio D variation with shear strain amplitude were investigated. A large amount of in-hole tests integrated with active surface wave tests were utilized to characterize the small-strain stiffness of the lithotypes identified in the area. Small-strain stiffness values determined by geophysical testswere further compared with thosemeasured in the laboratory showing different behaviors of soils and soft rocks. The effects of sample disturbance and degree of jointing, for soils and soft rocks, respectively, was invoked to explain the observed differences. The shear modulus and damping ratio versus shear strain amplitude curves were determined by means of resonant column and cyclic shear tests, both simple and torsional. The experimental results were compared with literature data on similar soils highlighting some peculiar behaviors. In particular the role of fine matrix in sandy soils and organic matter content of clays on the cyclic properties was stressed. The results showed that an increase in fine matrix and organic content results in a stronger linearity and lower damping ratio.
机译：本文介绍了旨在确定罗马中央考古区土壤和软岩的循环特性的原位和实验室测试结果，该区域在地震微带研究的框架内。研究了小应变剪切模量G_0（或类似的剪切波速度V_S）以及表示剪切模量G和阻尼比D随剪切应变幅度变化的曲线。大量的井内测试与有效的表面波测试相结合，用于表征该地区识别出的岩性岩石的小应变刚度。通过地球物理测试确定的小应变刚度值与在实验室中测得的小应变刚度值进行了进一步比较，显示出土壤和软岩石的不同行为。分别针对土壤和软岩的样品扰动和节理程度的影响来解释观测到的差异。剪切模量和阻尼比与剪切应变振幅曲线通过共振柱和循环剪切试验（简单和扭转）确定。将实验结果与相似土壤上的文献数据进行了比较，突出了一些特殊的行为。特别强调了细基质在沙质土壤中的作用以及粘土中有机物含量对循环特性的影响。结果表明，细小的基体和有机物含量的增加会导致更强的线性和更低的阻尼比。

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