Experimental characterisation of intact samples of Areolas da Estefania

Intact samples extracted from the Areolas da Estefania formation in Lisbon, Portugal, at depths of 8m, 18m and 21m were subjected to drained triaxial compression under constant mean effective stress levels. These files report the measured stress-strain response, as well as the variation of shear stiffness with deformation level. A complementary set of bender element tests were performed on two intact samples collected from depths of 8m and 18m to establish the shear stiffness of the material at very small strains.从葡萄牙里斯本埃斯特法尼亚环礁地层（Areolas da Estefania formation）采集的、取样深度分别为8m、18m与21m的原状试样，在恒定平均有效应力水平下开展了排水三轴压缩试验（drained triaxial compression）。本数据集文件记录了实测的应力-应变响应，以及剪切刚度随变形程度的变化规律。此外，针对取自8m与18m深度的两个原状试样，开展了弯曲元试验（bender element test），以确定该材料在极小应变条件下的剪切刚度。