Bending energy storage mechanical model of layered composite roof structure in coal mining.

The Layered Composite Roof Structure (LCRS) is a common bearing structure consisting of multiple layers of rock above a coal seam, and the energy stored in this structure plays an important role in the occurrence of rockburst. Few studies have been conducted on the theoretical modeling of energy storage in LCRS. This study theoretically developed a bending energy storage model for LCRS under three conditions, and the theoretical model was verified by simulation and experimental data.

Experimental study on the deformation localisation and acoustic emission characteristics of coal in Brazilian splitting tests.

This paper presents an experimental study to assess the behaviour of coal samples under tensile loadings to better understand the failure mechanisms and the interactions with the coal characteristics. A set of Brazilian splitting tests were carried out using disk specimens obtained from Tashan Coal Mine in China. The digital speckle correlation method and acoustic emission (AE) were used to capture the deformation localisation and AE characteristics of each specimen during the loading process.