The top coal of extra-thick coal seams is susceptible to irreversible failure under cyclic
loading and stress rotation caused by longwall top coal mining. To ensure efficient mining …

A true triaxial test system was used to study the mechanical and damage characteristics of
coal under tiered cyclic maximum principal stress (σ 1), intermediate principal stress (σ 2) …

The overall failure of gas-bearing coal–rock composite is the main cause of composite
dynamic disasters. Investigating the mechanical-seepage characteristics of coal–rock …

Coal–rock dynamic disasters seriously threaten safe production in coal mines, and an
effective early warning is especially important to reduce the losses caused by these …

In this paper, triaxial loading and unloading tests under different conditions were carried out
to explore the deformation and failure characteristics of hard rock marble, and the acoustic …

In deep underground engineering, true triaxial compressive stress and internal microcrack
characteristics significantly influence the brittle-ductile transition and anisotropic mechanical …

The analysis of failure behaviors and energy dissipation characteristics of a coal–rock
composite model is crucial to study mine dynamic disasters. A series of uniaxial loading and …

The unloading effect is an important factor for the failure of surrounding rock in deep
underground engineering projects, especially under high-stress conditions. To investigate …

Studying the anisotropic seepage characteristics of coal is of great significance to the safe
and efficient extraction of coalbed methane (CBM). The effective stress law (σ e= σ–αp) is …

The bedding and the true stress state have a great effect on the seepage and mechanical
properties of coal. In this study, the seepage experiments of coal with different bedding …