Triaxial compressive strength tests on 'Comiso' Limestone (Ragusa Formation; Sicily, Italy) samples

This dataset contains raw experimental triaxial testing data as outlined in "Castagna, A., Ougier‐Simonin, A., Benson, P. M., Browning, J., Walker, R. J., Fazio, M., & Vinciguerra, S. (2018). Thermal damage and pore pressure effects of the Brittle‐Ductile transition in Comiso limestone. Journal of Geophysical Research: Solid Earth, 123(9), 7644-7660.s, http://dx.doi.org/10.1029/2017JB015105". The data is provided in a .zip folder containing the files of 16 experiments that are accompanied by a README file for introduction. Files format is Microsoft Excel Worksheet (.xlsx) and data are tabulated. Each file contains the corresponding relevant sample’s details, and each column of data is clearly labelled, units included. For each experiment, time, radial and axial pumps volume displacements and pressures, top and bottom pore fluid pumps volume displacements and pressures, internal temperature, LVDT signals were recorded. Twenty right cylindrical samples of ‘Comiso’ limestone (Ragusa Formation; Sicily) were tested in triaxial compression at a range of confining pressures simulating depths of 290 m, 620 m, 1.2 km, and 2.0 km respectively, assuming an average density of the over-burden load of 2470 kg/m3. Prior to strength test, each sample was either oven dried (ca. 12 hours at 85 °C followed by cooling in a desiccator for 1 hour) or water saturated (samples in distilled water under vacuum for 24 hours). A subset of these samples has also been thermally treated at 150, 300, 450 and 600oC to induce thermal cracking prior to the mechanical testing. All tests were conducted at 10-5 s-1 axial strain rate in assumed drained conditions when relevant, and at room temperature. For saturated tests, the initial loading was applied in two steps, first by increasing Pc hydrostatically (σ1=σ2=σ3) until the desired confining pressure was reached, and then introducing pore fluid pressure, as per the functionality of the experimental set-up. The experiments were conducted by Drs A. Castagna, M. Fazio and P. Benson using the Snachez triaxial cell at the Rock Mechanics Laboratory of the University of Portsmouth. All responsible for the collection and initial interpretation of the data. Only 17 experiments are reported in this set of data; the missing 3 datasets are believed to be only available on the local computer storage of the triaxial apparatus used at that time.

本数据集收录了原始的三轴实验测试数据，数据来源于Castagna等人在2018年发表的论文《Comiso石灰岩中脆-韧性转变的热损伤和孔隙水压力效应》（发表于《地球物理研究：固体地球》期刊，第123卷第9期，页码7644-7660，DOI：http://dx.doi.org/10.1029/2017JB015105）。数据以.zip格式提供，包含16个实验的文件，并附有README文件以供介绍。文件格式为Microsoft Excel工作表（.xlsx），数据以表格形式呈现。每个文件包含相应样品的详细信息，数据列均标有清晰的标签，并注明了单位。每个实验均记录了时间、径向和轴向泵的体积位移和压力、顶部和底部孔隙流体泵的体积位移和压力、内部温度以及LVDT信号。对20个直径为‘Comiso’石灰岩（拉古萨地层；西西里岛）的圆柱形样品进行了三轴压缩试验，模拟的围压深度分别为290米、620米、1.2公里和2.0公里，假设覆盖荷载的平均密度为2470千克/立方米。在强度测试之前，每个样品要么经过烘干（约12小时在85°C下烘干，随后在干燥器中冷却1小时），要么进行水饱和处理（样品在蒸馏水中真空浸泡24小时）。其中一部分样品在机械测试前也经过150°C、300°C、450°C和600°C的热处理，以诱导热裂纹。所有测试均在假设的排水条件下，以10-5 s-1的轴向应变率进行，且在室温下进行。对于饱和测试，初始加载分两步进行，首先通过增加静水压力Pc（σ1=σ2=σ3）至所需的围压，然后引入孔隙水压力，实验装置的功能如下。实验由A. Castagna、M. Fazio和P. Benson博士在朴次茅斯大学岩土力学实验室使用Snachez三轴仪进行，他们负责数据的收集和初步解释。在本数据集中仅报告了17个实验，缺失的3个数据集据信仅存于当时三轴仪本地计算机存储中。