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Numerical simulation of water injection into coal seam throughlong drill hole and determination of its reasonable parameters

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It realizes the function of mine lane visulization and the visulization of Geologic structure, strata structure and burden condition of coal seam through exploration drill hole and parameters.

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According to the structure of terrane and exploring water result of coal floor disclosed by hydrology drill hole,it is demonstrated that there exists strong relationship among abnormal apparent conductivity, crack in rock stratum and the extent of filled water in crack,an.

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By the measures such as measuring the risk tendency of underground pressure eruption, evaluating risk index of underground pressure eruption, observing electromagnetic radiation, water injection in coal seam, long drill hole blasting, roof broken in gob area etc., realized safe coal production.

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Applying finite element method,the dynamic characteristics of drill string with cone bit in straight hole were simulated,and the whirl,deformation and the dynamic stress in air drilling were compared with the ones in drilling fluid drilling .

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Drill a 1/8 in diameter hole in each corner of the polycarbonate block.

鉆一個1 / 8洞的直徑在每一個角落的聚碳酸酯塊人人操人人爽c。

Our company sell all kinds of straight drills, electric hammer drill, tap die, cutter, reamer, hole devices, white blades, woodworking tools, FILE, alloy Cutter, alloy rotary burrs, welding turning tools, measuring tools, etc., the need to go into the details, please call.

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The strongpoint of level drill-hole drainage is that the holes can be placed on higher position,then can obtain larger gas drainage concentration and improve the efficiency.

水平鉆孔抽放的優(yōu)點是可選擇高的鉆孔位置，能獲得更大的瓦斯抽放濃度国产精品2020孕妇，可提高抽放效率一级做a爰片性色毛片。

It is used to drill heavy duty pretension anchor hole at side slope of water power station, railway or highway projects, as well as drainage holes.

它是用來演練重型預應(yīng)力錨孔在邊坡的水電站，鐵路或公路工程人人摸人人操人人插超碰，以及排水孔国产黄网大全在线视频。