Coal and Gas Outburst Prevention Technology and Management System for Chinese Coal Mines: A Review

Abstract

Abstract. Based on the gas-geology rules of Chinese coalmines, the outburst accidents are characterized and the main reasons are found out on serious coal and gas outbursts in China. The development history of coal and gas outburst prevention and control are briefly introduced, and various related technologies and management system for outburst prevention were discussed in detail. The problems and development trends of outburst prevention and control in China were put forward in this paper. The results show that the geological conditions and mining conditions are highly complicated compared to other countries; coal seams in China have characteristics of high ground stress, high gas content and gas pressure, low strength and permeability. Current outburst prevention technology is mainly a combination of both regional and local measures. Regional comprehensive outburst-prevention measures include four integrated parts, prediction of the regional outburst danger, regional outburst prevention measures, validation of the measures and onsite verification check. Local comprehensive outburst-prevention measures include prediction of working face outburst danger, working face outburst prevention measures, validation check, and safety protection. With the goal to totally eliminate all outburst accidents effectively and efficiently, supportive policies, both financial and technologic, are necessary to lead and guide coal mining enterprises to manage outburst mine actively, plan production activity reasonably and utilize new technologies and equipments eagerly.

Temperature-dependent diffusion process of methane through dry crushed coal

“…According to the geological survey, 61.14% of deep coal reserves are greater than 1000 m (Tang et al, 1999). There are currently more than 40 coal mines mining at depths greater than 1000 m, and the deepest mining depth is 1501 m. With increasing mining depth, the methane induced coal mine disasters are more pronounced because of the high CMM gas content and pressure, which also attributes the coal and gas outburst during mining activity (Lama and Bodziony, 1998;Hao et al, 2014). Thus, a majority of state-of-the-art coal seam degasification techniques are developed to lower the coal seam methane content and pressure (Cheng et al, 2004;Wang, 2006;Yi, 2007;Yang et al, 2008;Jiang et al, 2008;Li et al, 2011;Wang, 2012;Karacan et al, 2011;Zabetakis et al, 1973;Noack et al, 1998;Hyman et al, 1987).…”

Research on Digging Anchor Parallel Operation Efficient Excavating Technology and Equipment

“…In recent years, China has developed fast excavation equipment that integrates coal cutting, anchoring support, and transportation, effectively addressing the problems of high manual support intensity and slow speed, thus enabling parallel excavation and anchoring operations and improving single-entry efficiency. This paper takes a threeheart arch-shaped working face as an example and proposes an efficient excavation process and solution for parallel anchoring operations [1][2][3][4][5].…”

Study on the Influence Mechanism of Air Leakage on Gas Extraction Effect—A Numerical Case Study of the Coal Mine Site in Anhui

“…Cheng et al [21] established a gas-solid coupling model considering fracture gas seepage, permeability evolution, and coal deformation to analyze the influence of diffusion and seepage on gas transport and investigate the mechanism of negative pressure in the gas extraction process. Hao et al [22] developed a fluid-structure interaction model that accounted for coal creep effects to determine the effective radius of boreholes at different burial depths. Wang et al [23] established a dynamic permeability change model of coal seams considering effective stress, gas desorption, and coal matrix shrinkage effects, simulating the penetration changes based on different coal seam gas pressures.…”