Mine water is a menace to coal mining. Transient Electromagnetic Method (TEM) is a relatively quick and efficient method to detect the water yield property of a targeted layer. Based on mine-oriented 3D TEM observing system, the signal of induced voltage is obtained. TEM 3D data volume can be calculated through the calculation of late-period resistivity and time-depth conversion. After setting ...

In order to solve the current two major environmental problems of urban waste pollution and surface subsidence above coal mine goaf, technology sealing backfilling goaf with is proposed. This takes "waste disposal" "goaf backfilling" as theme. Aiming at processing loose waste, drying briquetting integrated machine designed, entire ensures strength materials no filtrate. For solid aggregate it c...

The method of dividing the “three zones” spontaneous combustion in goaf by oxygen volume fraction is most widely used and effective at present. However, does not consider influence methane concentration goaf, which only applicable to low-gas high-gassy goaf. In this work, oxidation behavior kinetics parameters a lean coal low temperatures under five different concentrations, including its durin...

Previous theories on coal spontaneous combustion (CSC) prevention and control mostly focused how to improve the CSC-inhibiting effect instead of failure inhibitors. Due influence air leakage in goaf, inhibitors water evaporate continuously, thus making inhibit weakened or even null. complex environment inside it is difficult for personnel enter collect data such as moisture. Therefore, a three-...

Closing the fire area is a common disaster-relief measure when coal spontaneously combusts in goaf. However, closure process will also increase risk of gas explosion. To understand migration rules and disaster-causing effects closed goaf, this study simulates spontaneous combustion leftover goaf closed. The simulation was visualized on PyroSim interface. After identifying distribution laws temp...


 Old goaf under the overpass becomes serious hidden trouble of subgrade-pavement and bridge engineering. Based on geological survey, geophysical survey theoretical analysis, this paper studies formation mechanism distribution characteristics surface residual deformation in old No.9 Line Overpass across Rapid Rail Transit No.3 Dalian city. A comprehensive analysis evaluation has been made ...

The basis of traditional ground pressure and strata control techniques is the key theory, wherein position stratum can easily be determined for coal seams with regular thickness without goaf. However, in case mining ultrathick underneath goaf, methods used calculation need to improved order account additional seam presence an upper This study analyzed failure height collapse characteristics ove...

Based on the ventilation characteristics of gob-side entry retaining face, a mathematical model spontaneous combustion in face is established. From overburden caving goaf along roadway, development rock strata and residual coal fissures are summarized analyzed. In addition, by using numerical simulation software, effects normal mining period, roadway as return air leakage prevention, nitrogen i...