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4 results for “roof cutting”
Research on stress release for gob-side roadway using roof-cutting technology with chainsaw arm
The narrow pillar mining technology is usually adopted for workface in coal mines. However, in case of overlying hard roof, a suspended triangle roof palte or a cantilever will be formed near the goaf. At this point, the coal pillars will be extruded and serious deformation for gob-side roadway will occur. In order to solve the problem, the roof-cutting technology with chainsaw arm and its equipment has been developed. In this paper, the deformation and failure characteristics of 2312 roadway near the goaf of 2311 working face in Tashan Coal Mine were firstly analyzed. So, the roof-cutting technology with chainsaw arm was applied in 2311 roadway. Next, the roof-cutting process and the load acted on the coal pillar were discussed and analyzed. Then, the numerical model was established to analyze the stress releasing effects. Moreover, the roof-cutting height and the support parameters of the roadway were optimized. The numerical analysis manifested that the roof cutting was the most effective when the roof-cutting height was 6.4 m. And after roof cutting, the vertical stresses of the coal pillars decreased by about 25.0%. Finally, the roof-cutting experiment was carried out in 2311 roadway in Tashan Coal Mine. The on-site roof-cutting depth was 6.4 m and the roof-cutting width was 42 mm. To verify the stress releasing effects, the borehole stressmeters were applied to monitor the peak advanceing stresses of narrow pillars at various depths. The measured results indicated that the peak advanceing stresses decreased by 22.8% on average and thus achieved the roof cutting and stress releasing effects.
Research on stress release for gob-side roadway using roof-cutting technology with chainsaw arm
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The sustainable development of coal mines by new cutting roof technology
<p>China consumes more than 3.6 billion tons of coal every year, accounting for over 60% of the energy consumption. Therefore, the sustainable development of coal mine is a problem needed to be solved by the Chinese government. During the coal resources recovery, the protective coal pillars between the adjacent working faces cause the serious loss for coal resources. In order to solve the problem, it was put forward that the new technology of roof cutting with chain arm to retain roadway in the paper. Firstly, the process of retaining roadway, roof-cutting parameters and the damage ranges of roadway surrounding rock induced by roof cutting with chain arm were analyzed. Then, it was given that the working resistance of the temporary support equipment in technology of roof cutting with chain arm to retain roadway. Next, the roof-cutting height, the type of temporary support equipment, working resistance of portal support and support parameters of the bolt and anchor cables were optimized by the numerical calculation. Finally, the industrial experiment of retaining roadway by roof cutting with chain arm was carried out in a working face. The surrounding rock damage was minimal with the use of chain arm-roof cutting technology, and the variation range of the uniaxial compressive strength was only 5%, resulting in the roof damage rate to 82 mm. From the studies, it was concluded that this technology could be of a great asset to the coal mining community.</p>
The sustainable development of coal mines by new cutting roof technology
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