Yima Coal Mining Group

Yima, China

Yima Coal Mining Group

Yima, China

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Xu X.,Henan Polytechnic University | Dou L.,China University of Mining and Technology | Liu J.,Yima Coal Mining Group | Zhang Y.,Yima Coal Mining Group
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2014

In view of the support technique of coal seam roadway with floor burst hazard, theoretical analysis and numerical simulation methods were used in this paper to study the control function of closed compressible supporting structure made up of anchor net and "O" type shed on floor burst. The results show that high horizontal stress is also distributed in the roadway floor supported with the closed compressible supporting structure, and floor burst risk also exists, compared to the other supporting forms in similar mining geological conditions. Under the dynamic load disturbance, floor burst may happen with the displacement increasing suddenly and the horizontal stress reducing at the same time. However, the roadway does not show obvious floor failure but radial deformation of surrounding rock, and the deformation is relatively small, which shows that the closed compressible supporting structure can't eliminate rock burst hazard entirely, but can reduce the damage degree. The results can provide reference to roadway support in similar coal mine conditions.


Xu X.-F.,Henan Polytechnic University | Xu X.-F.,China University of Mining and Technology | Dou L.-M.,China University of Mining and Technology | Liu J.,Yima Coal Mining Group | And 3 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2012

To research the evolution laws of floor burst under dynamic loads, theory analysis and numerical simulation methods were used in this paper, to study the response characteristics of stress, displacement, et al, of roadway bottom coal under dynamic disturbance, and to reveal the causing reason and burst process induced by dynamic stress. The results show that the buckling failure and deformation will happen in the bottom coal seam, when the superposition of dynamic stress and high horizontal stress in floor reaches or surpasses the strength limit. In addition, the tensile stress, which is formed by the reflection of incident stress wave at the floor surface, causes spallation damage in the floor, and with the gradual enlargement of the damage range, the floor burst will be induced. Under the dynamic loading, the horizontal stress, vertical stress and stress difference firstly increase in a small extent, and then decrease substantially. At the same time, the scope of tensile failure zone and the vertical displacement increase subsequently. During the process, the concentration of horizontal stress in floor disappears gradually.


Chu T.-X.,Henan Polytechnic University | Chu T.-X.,China University of Mining and Technology | Liu C.-S.,Yima Coal Mining Group | Yu M.-G.,Henan Polytechnic University | And 2 more authors.
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | Year: 2012

In this paper, based on the gas extraction technique of upper roadway in high gas and easily spontaneous combustion coal seam, taking the study of spontaneous combustion mechanism as point of penetration, according to the actual spontaneous combustion situation of LW13190 in Gengcun coal mine, Yima coal industry group, we have studied the strata fracture development, air leakage passage model, expansion property of float coal in goaf, and power source of air leakage, et al, by using theoretical analysis, mathematical model and field aided test. The results show that the gas extraction in upper roadway has increased the spontaneous combustion risk in the high gas and easily spontaneous combustion coal seam, which mainly embodies in: 1) Air leakage passage and power are exist in the port between the coal face, goaf and upper drainage roadway; 2) The coal-rock mass fractures are fully development duo to mining stress and loose circle of drainage roadway, while the compaction degree of float coal in goaf decreases, and the expansion property of float coal increases, which are beneficial to the spontaneous combustion and heat storing of coal mass; 3) Once the float coal in goaf is oxidized, the temperature gradient will exit between the high temperature dot in goaf and air leakage passage. Then, the formed endogenous fire pressure will exacerbate the spontaneous process of broken float coal in goaf, and induce the spontaneous combustion of float coal.

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