نتایج جستجو برای: goaf
تعداد نتایج: 334 فیلتر نتایج به سال:
In this paper, a two-phase model of air shock wave induced by rock-fall was described. The model was made up of the uniform motion phase (velocity was close to 0 m·s-1) and the acceleration movement phase. The uniform motion phase was determined by experience, meanwhile the acceleration movement phase was derived by the theoretical analysis.A series of experiments were performed to verify the t...
Based on the background of close coal seam mining in Qianjiaying mine, Tangshan, China, feasibility upper complex underlaying goaf is analysed using roof caving analysis and numerical method. The deformation roadways monitored by field measurement 3D laser scanning. characteristics #5 after 1378P, 2071P, 2072P, 2091P working panels with a depth 39–54 m below are Results show that maximum superi...
For the mine of large goaf, there are many factors that affect filling quality. In order to improve quality, it is necessary identify have a significant impact. this paper, fuzzy mathematical method was used analyze five main (PC32.5cement sand ratio, slurry concentration, number lowering, dehydration and drainage, tailing particle size grading) affecting The priority each influence factor calc...
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