Study of triaxial compression test on mechanical parameters of coal rock

Abstract

The stability problem of the coal seam roof and bottom slab has been an important issue for mine safety in the process of coal mine workings in the recovery process. To solve this problem, rock mechanics tests are needed to study the mechanical properties of coal seams and top and bottom plates. In this paper, triaxial compression tests were applied to the No. Coal-two seam and top and a bottom slab of Wangjiazhai coal mine, and the compressive strength, residual strength and cohesive force C, and internal friction angle of coal rocks under different circumferential pressure were measured. φ values. The test results show that the residual strength of the rock is higher than that of the coal sample and decays faster with the increase of strain, and the axial bearing limit of the coal rock is generally linear with the surrounding pressure, which generally conforms to Coulomb's strength criterion. The findings of the study are of great significance for the support design of the roadway and the study of other reinforcement mechanisms.