Abstract Goaf treatment and comprehensive utilization of geothermal energy are great significance to the restoration land resources sustainable development in coal mining subsidence areas. In this paper, goaf technology reviewed detail. Among them, mainly includes: caving method, filling support closed isolation method joint method. Geothermal shallow ground source heat pump technology, coaxial...

Abstract The height of the fracture zone in mined-out area is basic parameter for controlling mine strata, preventing and water, arranging drilling holes high-level gas extraction. Aiming at development law steep seam limitation traditional inspection method, microseismic monitoring technology used to investigate goaf. Taking 3103 south working face a Sichuan as an example, scheme data collecti...

In this paper, through a similar simulation experiment, the roof rock breaking situation of horizontal sublevel caving method in extremely thick and steep inclined coal seam is studied, response characteristics mass under different dynamic load strength are analyzed. The mechanical mechanisms mining positions influence law surrounding from elastic deformation to impact failure revealed. study s...

Goafs are one of the main factors that endanger safety mining areas, leading to roadway collapse, land subsidence and other problems. Determining how detect goafs accurately efficiently is an important issue faced in engineering geophysical exploration research. Microtremor survey technology, used exploration, has been developed recent years. It advantages low cost, flexible construction, topog...

Coal is the main energy source in China, and spontaneous combustion of coal one disasters mines. Fully mechanized caving top mining technology widely used Under comprehensive action multiple factors, gas generated by oxidation low oxygen goaf easy to rush working face, resulting lower concentration upper corner exceeding harmful concentration. It seriously threatens health underground workers n...

In view of the severe ground pressure behavior and spontaneous combustion risk goaf in fully mechanized top coal caving face with deep buried weak cohesive roof thick seam prone to combustion, combined theoretical analysis mining overburden structure field engineering practice, structural characteristics rock strata law are studied. The results show that: stope also has phenomenon surface step ...

Spontaneous combustion of coal is an important disaster that needs to be addressed in the mine production process. Since its ignition position often unknown and concealed, determining goaf great significance work safety mining area. This study measured thermal conductivity samples using spherical model, obtains fitting relationship between conductivity, heating voltage U inner sphere outer wall...

The spontaneous combustion of broken coal is one the main causes for mine safety accidents in goafs. To determine effect different air-leakage conditions on leftover coal, passage goaf was designed based principle Sudoku grid an inflammable seam. temperature rise during auto-ignition oxidation studied using a self-built experimental platform. By changing air-flow rate, laws change oxygen consum...