نتایج جستجو برای: longwall top coal caving ltcc
تعداد نتایج: 158891 فیلتر نتایج به سال:
Solid backfilling is an environmentally friendly method of coal mining. Backfilling hydraulic supports are important devices in solid backfill In order to speed up the design and manufacturing process them, this paper proposes a support reformation evaluation. The mechanical models top-coal caving were established analyze stress characteristics main structure. ABAQUS was used establish 3D numer...
An area of major concern in considering increased coal production and utilization is the health and safety of increased numbers of workers who mine, process, or utilize coal. Hazards related to mining activities in the past have been especially serious, resulting in many mine related accidental deaths, disabling injuries, and disability and death from chronic lung disease. Underground coal mine...
Gamma ray, density, sonic and core logs obtained from two boreholes drilled over a longwall panel in Southwestern (SW) Pennsylvania were analyzed for formation boundaries, log-derived porosities and densities and for rock elastic properties from sonic transit times. Gamma ray (GR) and density logs (DL) were analyzed using univariate statistical techniques and fractal statistics for similarity a...
Purpose. To study regularities in changes convergence of wall rocks along a setting line the powered props depending upon sandstone availability within roof, mining depth, as well its position relative to coal seam length extraction column based on results numerical experiments and forecast probable zones rigid settlement support units according longwall at any moment stope arrangement pillar a...
To reveal the critical factors of main roof influencing stability surrounding rocks roadways driven along goaf in fully-mechanized top-coal caving faces, this paper builds a structural mechanics model for based on geological conditions 8105 face Yanjiahe Coal Mine, and stress equilibrium key rock block B are analyzed, focus is analyzing rules goaf. Then, orthogonal experiment range method used ...
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