Due to the gradual depletion of shallow mineral resources at present, mines are now gradually entering deep mining stage. To promote safe and efficient green coal sustainable energy development, improve production efficiency paste filling mining, research group has performed this study on technology application working face. Taking face 1241 (3) Xieqiao mine as engineering background, selection...

In order to study the space–time evolution law and induced impact mechanism of overburden breaking in tangential horizontal sublevel during fully mechanized mining extra-thick steep coal seams, we took Yaojie No. 3 mine as an example. Through establishment mechanical model, structural characteristics hinged rock beams after structure instability were analyzed, static dynamic load conditions tha...

Abstract The prevention of gas overrun in the panel is one key issues on green mining. In this paper, a physical goaf model was established based geological production conditions coal seam mine Henan Province, and combined drainage technology by burying spilling pipeline upper corner proposed. Fluent software used to simulate changes mass fraction flow field distribution when extracted from wit...

Mineral resource-based cities have formed a large number of goafs due to the long-term mining coal. It is great significance make full use abandoned land resources above goaf promote transformation and development cities. In order avoid threat surface residual deformation proposed construction project, it an urgent problem obtain stability results site accurately. First all, based on principles...

The porosity distribution law of overlying strata in the goaf has an important guiding role distinguishing hidden disaster-causing factors goaf, such as gas enrichment area and spontaneous combustion area. Existing research is concentrated on a single working face (GSWF), adjacent (GAWF) must be different from that GSWF. By selecting Longshan Coal Mine engineering background applying theoretica...

The height of the water-conducting fractured zone (WCFZ) is a basic parameter related to water protection in coal mines and also crucial for aquifer mine safety. In order accurately detect shape reveal formation mechanism WCFZ, which caused by middle-deep seam mining sandy region, 112201 coalface at 1# Xiaobaodang was taken as case study. Filed measurements including fluid leakage, borehole TV,...

Mining is associated with poor safety due to pressure relief gas emission from the goaf during production period. The aim of this study was explore a case Wangjialing coal mine 12322 working face in Shanxi, China, through physical simulation and field observation. characterized by overlying strata fracture process mining. A mathematical model source migration finite element COMSOL software were...

The technical principle of gas drainage using high-level directional extraction boreholes was analyzed. A range overburden strata stimulated for pressure relief during mining, the effects different borehole parameters on flow in goaf and concentration upper corner were compared, a field test conducted to analyze effect peculiarities drainage. With mining work plane, fissures gradually develop f...

This study comprehensively analyzes the safety and stability of old goaf under construction engineering based on specific projects using a variety research methods. The Beijing Mentougou mining area is used as background. methods field investigation, laboratory testing, drilling, geophysical exploration, theoretical calculation, numerical simulation are combined to quantitatively analyze founda...