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首页> 外文会议>International symposium on deformation characteristics of geomaterials;IS-Seoul 2011 >Microstructural features and compressibility of volcanic deposits from Central Italy
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Microstructural features and compressibility of volcanic deposits from Central Italy

机译：意大利中部火山岩的微观结构特征和可压缩性

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Large areas of Central and Southern Italy are covered by pyroclastic materials, at the border between weak rocks and granular soils, which pose various problems in modelling their mechanical behaviour for geotechnical design. The paper reports the results of a comparative experimental study of the microstructural features and compressibility of three pyroclastic deposits from Central Italy, namely two pozzolanas from the Colli Albani Volcanic Complex, located immediately south-east of the city of Roma, and one pozzolana from the Vulsini Volcanic Complex, forming the slab on which the historical town of Orvicto is founded. The compressibility was investigated by means of conventional laboratory techniques, such as one-dimensional and isotropic compression tests, performed on natural and reconstituted samples. However, due to the pyroclastic nature of the materials, special non-standard procedures had to be developed for the preparation of natural samples, including coring of frozen samples. At the same time, an investigation of the microstructural features of the materials was undertaken by means of optical and electron scanning microscopy. The paper discusses the results of the experimental activity in order to find out common features and differences of behaviour of the three materials and to try and connect the primary and secondary compressibility characteristics to the observed microstructural features.
机译：在意大利中部和南部的大片地区，在弱岩石和粒状土壤之间的边界处充满了火山碎屑物质，这为岩土​​工程设计的力学行为建模带来了各种问题。该论文报告了一项对来自意大利中部的三种火山碎屑沉积物的微观结构特征和可压缩性进行对比实验研究的结果，这三种火山碎屑沉积物分别来自位于罗马市东南部的Colli Albani火山综合体的两个火山灰和来自罗马的东南部的一个火山灰。武尔西尼火山综合体，形成了历史悠久的奥尔维克托镇所在的板岩。可压缩性是通过常规实验室技术研究的，例如对天然和重组样品进行的一维和各向同性压缩测试。但是，由于材料的火山碎屑性质，必须开发特殊的非标准程序来制备天然样品，包括对冷冻样品取芯。同时，通过光学和电子扫描显微镜对材料的微观结构特征进行了研究。本文讨论了实验活动的结果，以找出三种材料的共同特征和行为差异，并试图将主要和次要可压缩性特征与观察到的微观结构特征联系起来。

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