Deformation characteristics of bedded sandstone in uniaxial compression

摘要

A series of uniaxial compressive strength tests were performed to study the deformation characteristics of bedded sandstone with bedding layers in different orientations.Test results revealed that the samples with bedding layers oriented in smaller angles (55°,35°,20°,and 10°),measured from the horizontal axis,undergo larger deformations compared to that of the samples with bedding layers oriented in higher angles (83°)at any stage of loading.When 75％ of the peak load is reached,a considerable deformation had taken place in samples with bedding layers oriented in smaller angles (55°,35°,20°,and 10°),whereas a significantly less deformation had taken place in samples with bedding layers oriented in higher angles (83°).Moreover,at 55°and 35° bedding orientations,deformation was mainly observed within the middle region of specimens and at 20° and 10° bedding orientations deformation was more diffused throughout the specimen.