Influence of principal stress effect on deformation and permeability of coal containing beddings under true triaxial stress conditions.

ABSTRACT: In situ stress is generally an anisotropic/true triaxial stress (σ 1 > σ 2 > σ 3). Bedding weakens the continuity and integrity of coal. It is critical to understand the mechanical behaviour and gas migration of coal under true triaxial stress conditions. We performed experiments of cubic coal samples to investigate the permeability evolution and mechanical behaviour of coal under true triaxial stress conditions by using newly developed true triaxial geophysical apparatus. We analysed the effect of principal stresses on deformation and permeability characteristics of coal containing bedding planes. The results show that volumetric strain, stress states and bedding directions determine the permeability comprehensively. The variable quantity of strain was the largest in the direction normal

SUBMITTER: Dai J 

PROVIDER: S-EPMC6408416 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature