نتایج جستجو برای: mine shaft
تعداد نتایج: 34518 فیلتر نتایج به سال:
The paper presents the results of data analysis conducted at Bereznyaki Mine-2 Uralkali in summer and winter (during air pre-treatment period). findings show that when mine heaters are operating thermal drop ventilation pressure appears supply shafts. It causes “airlocks” shafts – a phenomenon nearly stops airflow one while increasing dramatically other (others) intake As resu...
A mine shaft steelwork is a three-dimensional frame that directs the vertical motion of conveyances in shafts. Here, we conduct field and numerical investigations on stiffness dynamic properties these structures. Based design documentation shaft, materials data, site inspection, steelwork’s finite element model, featuring material geometric non-linearities, was developed Abaqus. Static load tes...
One of the greatest mysteries for most of the twentieth century was the fate of the Romanov family, the last Russian monarchy. Following the abdication of Tsar Nicholas II, he and his wife, Alexandra, and their five children were eventually exiled to the city of Yekaterinburg. The family, along with four loyal members of their staff, was held captive by members of the Ural Soviet. According to ...
Increase in downhole mining prompts the need to develop effective methods for maintenance of shafts. Currently, grouting behind shaft wall is main approach used prevention water seepage into shaft. Several factors determine effect, and often fails during field applications due use ineffective parameters. In present study, numerical simulation was performed evaluate slurry diffusion regularity u...
In order to evaluate the impact of groundwater drainage on flow, Hetaoyu coal field was taken as a case study in Longdong area, China, where seam covered with multilayer aquifers. A three-dimensional unsteady flow model and one-dimensional fracture water were calculated by joint equations for changing hydrogeological structures under mining. According results, mine construction had greatly affe...
The geological structure of coal mines has always been a dangerous object attention in mine outburst prevention work. In order to realize safety information management and early warning gas disasters, comprehensive use theory, disaster computer technology other analysis methods, considering the influence structure, seam occurrence parameters, an indicator system for identifying risk outbursts r...
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