The fracture field and permeability distribution model of comprehensive working face goaf was integrated upon the theoretical examination to investigate law gas migration accumulation characteristics, this has been applied mathematical in goaf. ANSYS FLUENT numerical simulation software used obtain characteristics its influencing factors analyze applicability solving features proliferation usin...

In order to analyze the deformation of old goaf in Dameidong Coal Mine and its influence on surrounding rock soil layer, it provides guidance for prevention control geological disasters region. this paper, transient electromagnetic method numerical simulation were used study law overlying strata mining area. The results detection showed that subsidence area was within range elliptical water-ric...

This paper examines the relationship between advancement of working face and distribution spontaneous coal combustion under a low air leakage wind speed in goaf. Based on unsteady-state simulation method, process was simulated fully mechanized mining at different advancing speeds. The speeds area oxidation zone goaf clarified. A safe determined. Furthermore, altered high temperature inside An i...

Waste concrete powder (WCP) is proposed to replace part of the cement seek environmentally friendly grouting materials for ground improvement in mine goaf. The optimal mixing proportion was selected based on performance indexes water-separation ratio, stone rate, viscosity, setting time, and compressive strength. X-ray diffraction (XRD) scanning electron microscopy (SEM) tests were also conduct...

To solve the safety hazard of a buried gas pipeline caused by subsidence mined-out area, three-dimensional model in area was established using geological parameters and finite-element software ABAQUS. The effects friction coefficient pipe soil, coal-seam dip angle, horizontal angle on mechanical behavior under varying widths goaf were investigated. results indicate that maximum equivalent stres...

Goaf Frictional Ignition (GFI) poses a serious threat to the safety of underground coal mines, and has caused many underground fires and catastrophic explosions. This paper examined occurrences of GFI incidents and the underlying mechanisms of ignition source and environment. Most of these incidents were attributed to rock on rock frictional ignition. The eventuation of frictional ignition reli...

In this paper, a semi-empirical model of air waves induced by falling rock is described. The model is composed of a uniform motion phase (velocity close to 0 m·s-1) and an acceleration movement phase. The uniform motion phase was determined based on experimentally and the acceleration movement phase was derived by theoretical analysis. A series of experiments were performed to verify the semi-e...