Journal of China Coal Society 

About: Journal of China Coal Society is an academic journal. The journal publishes majorly in the area(s): Coal & Coal mining. Over the lifetime, 2961 publications have been published receiving 14869 citations.

State of the art review on mechanism and prevention of coal bumps in China

Abstract: The features of coal bumps happened in Chinese coal mines were described The definition of terminology among coal bumps,rock bursts and mine tremors were discussed The mechanisms of coal bumps were classified into three models These are bounce failure of openings surrounding rock or coal,translatory burst of coal seam between roof and floor or slipping burst of geologic faults,and structure sudden destabilization of an entire pillar or massive strata around mining panels Moreover,four key issues in research point of view for fully understanding and better controlling phenomena of coal bumps were discussed These issues involve the geological conditions relevant to coal bumps and the quantitative analysis method,the properties and engineering behaviour of discontinuous rock masses under the dynamic loading,the multi-factor coupling interaction mechanisms between coal bumps and space-time distribution of mining-induced stresses and energy in mining disturbed region,and the monitor-detect prevention and control methods of coal bumps Finally,significant development and existing problem in controlling coal bumps in China were reviewed,and recent trends and a path forward on control of coal bumps in future were also pointed out

Research and consideration on deep coal mining and critical mining depth

Abstract: Based on characteristics of a series of engineering disasters such as rock burst,coal and gas outburst,roof weighting,water outburst with increasing depth,a quantitative difference between shallow and deep depth was discussed.Furthermore,based on demand on reserves capacity for sustainable mining and technological development,the concept and limit of critical mining depth were also proposed within the framework of the air temperature of mining face,control of tunnel deformation and mining-induced strain energy accumulation of surrounding rocks.

Mining-induced mechanical behavior in coal seams under different mining layouts

Abstract: By summing up a property of the abutment pressure at long-wall coal face under three typical mining layouts,i.e.,top-coal caving,non-pillar mining and protected coal seam mining,some general mining-induced mechanical characteristics such as magnitude and location of peak stress of abutment pressure were proposed.Furthermore,a stress state of coal in the front of mining face was suggested to determine the loading and unloading parameters for a laboratory study subjected to different mining layouts.The vertical stress(i.e.,an abutment pressure) and the horizontal stress of coal in the front of long-wall mining face were simulated by increasing the axial stress and decreasing the confining pressure simultaneously in a conventional triaxial compression test.As a result,a mining-induced mechanical behavior such as stress-strain curves and peak stresses as well as the differences of vertical stress,horizontal stress and deformation of coal samples among three typical mining layouts are obtained.Additionally,a relation between the mining-induce mechanical behavior of coal in the front of coal mining face and typical mining layouts is suggested.

Study on waste-filling method and technology in fully-mechanized coal mining

Abstract: The development course of backfilling mining technology was briefly reviewed,and pointed out two difficulties in developing the technology,that was to build the strata control theory in filling mining and to solve some technical approaches of transporting backfill to the goaf,the transport passage,the power and so on.Furthermore,the equivalent mining height method of the strata control in solid filling mining and the ground subsidence prediction was built.The principle and method of solid filling in fully-mechanized coal mining(SFFMCM) adapted to the traditional fully-mechanized coal mining(FMCM) technology was provided and the filling mining system and equipment self-developed were introduced at length.Industrial tests show that by using this technology not only can achieve the solid stowing to control strictly strata movement and ground subsidence prediction but also can achieve the economic benefit with high production and high recovery and environmental benefit.

Structure characteristics and accumulation significance of nanopores in Longmaxi shale gas reservoir in the southern Sichuan Basin

Abstract: Presented a study on shale gas reservoir of Longmaxi Formation of Lower Silurian in southern Sichuan BasinThe reservoir porosity was measured using nitrogen adsorption methodThe pore volume,pore specific surface area and pore size distribution were studied through the isotherms and DFT analysisBased on all of these,discussed the main factors to control the nanopore structure and the nanopore's influence on shale gas accumulationThe results show that,the pore structure of the shale gas reservoir of Longmaxi Formation is relatively complex,which is composed of nanopores and possesses a certain ruleless structure(the amorphous pore),pores are open in style and mainly consist of the cylinder pores with two ends open and parallel-plate pores with four sides openIt is concluded that openness degree of the pores improved with the increase of the vertical depth,the sizes of the main nanopores are in a range of 2～40 nm,which take up 8839% of the total volume of pores and 9885% of specific surface areaMost of the pore volume is occupied by the mesopores which are 2～50 nm in sizeThe micropores and mesopores of which the diameters are less than 50 nm dominate the main pore specific surfaceThe main internal factor to control the volume and the pore specific surface of nanopores of the shale gas reservoir in Longmaxi Formation is TOC contentIt is also the important substance to provide the main storage spaceThe nanopores have a strong ability to absorb shale gas,the interior of which is structured filled with the shale gas,thus increase shale gas storage capacity and finally make the model characteristic complicatedThe open nanopores can improve the shale gas desorbing efficiency and the permeability of the reservoirs,and then improve the shale gas production