Coal and gas outburst dynamic system

TLDR

Coal and gas outburst is an extremely complex dynamic disaster in coal mine production that can cause casualties, damage equipment, and disrupt ventilation by suddenly ejecting large amounts of coal and gas into the roadway or working face. This paper analyzes the interaction among the three essential elements of the coal and gas outburst dynamic system. A stress‑seepage‑damage coupling model was established to simulate the evolution of the system and investigate its size scale. The dynamical system consists of coal‑gas medium, geological dynamic environment, and mining disturbance; in the C13 coal seam of Panyi Mine it spans 8–12 m ahead of the advancing face, enlarging with large geological structures, and this research guides the development of outburst prediction and prevention measures.

Abstract

Coal and gas outburst is an extremely complex dynamic disaster in coal mine production process which will damage casualties and equipment facilities, and disorder the ventilation system by suddenly ejecting a great amount of coal and gas into roadway or working face. This paper analyzed the interaction among the three essential elements of coal and gas outburst dynamic system. A stress-seepage-damage coupling model was established which can be used to simulate the evolution of the dynamical system, and then the size scale of coal and gas outburst dynamical system was investigated. Results show that the dynamical system is consisted of three essential elements, coal-gas medium (material basis), geology dynamic environment (internal motivation) and mining disturbance (external motivation). On the case of C13 coal seam in Panyi Mine, the dynamical system exists in the range of 8–12 m in front of advancing face. The size scale will be larger where there are large geologic structures. This research plays an important guiding role for developing measures of coal and gas outburst prediction and prevention.