煤体应力与钻杆转速关系的试验研究
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摘要
为通过监测煤体应力来预测冲击地压,分析钻孔过程中钻头与钻杆相互作用的力学特性,建立煤体应力与钻杆转速的力学模型,研究钻孔过程中煤体应力对钻杆转速影响规律,理论上给出了利用钻杆转速判断煤体应力的可行性。利用钻杆转速测试系统,对预先自制的相同强度煤体试件进行钻孔试验,分析不同煤体应力时钻杆转速变化规律。研究结果表明:在相同试验条件下,使用同样钻进设备,按照预定推进速度钻孔,钻杆转速与煤体应力近似呈负相关。为进一步验证理论模型和试验测试可行性,在实际矿井工作面进行现场试验,并通过钻屑量指标证明转速测试结果与理论分析有较好一致性。
In order to predict the rock burst through coal-stress monitoring, the mechanical characteristics of interaction between drill bit and drill pipe in the drilling process were analyzed. Meanwhile, the mechanical model of coal stress and drilling rotation speed was established. Effect of coal stress on drilling rotation speed was studied. The feasibility of adopting drilling rotation speed to determine coal stress was given. Drilling tests were carried out on the premade coal specimen with same strength by using drilling rod speed test system. Changes of drilling rotation speed under different coal specimen stress were studied. Results show that the drilling rotation speed is approximately negatively correlated with the coal stress under same test conditions, same drilling equipment and same predetermined drilling speed. To further verify the feasibility of theoretical model and experimental test, on-site tests were carried out in the coalmine working face. It is proved that the test results of rotational speed are in good agreement with above theoretical analysis.
In order to predict the rock burst through coal-stress monitoring, the mechanical characteristics of interaction between drill bit and drill pipe in the drilling process were analyzed. Meanwhile, the mechanical model of coal stress and drilling rotation speed was established. Effect of coal stress on drilling rotation speed was studied. The feasibility of adopting drilling rotation speed to determine coal stress was given. Drilling tests were carried out on the premade coal specimen with same strength by using drilling rod speed test system. Changes of drilling rotation speed under different coal specimen stress were studied. Results show that the drilling rotation speed is approximately negatively correlated with the coal stress under same test conditions, same drilling equipment and same predetermined drilling speed. To further verify the feasibility of theoretical model and experimental test, on-site tests were carried out in the coalmine working face. It is proved that the test results of rotational speed are in good agreement with above theoretical analysis.
引文
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[2]窦林名,蔡武,巩思园,等.冲击危险性动态预测的震动波CT技术研究[J].煤炭学报,2014,39(2):238-243.DOU Linming,CAI Wu,GONG Siyuan,et al.Research on shock wave CT technology for dynamic prediction of impact risk[J].Journal of China Coal Society,2014,39(2):238-243.
[3]吕进国,姜耀东,赵毅鑫,等.冲击地压层次化监测及其预警方法的研究与应用[J].煤炭学报,2013,38(7):1161-1167.LYU Jinguo,JIANG Yaodong,ZHAO Yixin,et al.Hierarchical monitoring for coal bumps and its study and application of early warning methods[J].Journal of China Coal Society,2013,38(7):1161-1167.
[4]潘一山,徐连满.钻屑温度法预测冲击地压的试验研究[J].岩土工程学报,2012,34(12):2229-2233.PAN Yishan,XU Lianman.Experimental investigation on temperature of drilling cuttings to predict rock burst[J].Chinese Journal of Geotechnical Engineering,2012,34(12):2229-2233.
[5]曲效成,姜福兴,于正兴,等.基于当量钻屑法的冲击地压监测预警技术研究及应用[J].岩石力学与工程学报,2011,30(11):2346-2351.QU Xiaocheng,JIANG Fuxing,YU Zhengxing,et al.Research and application of rockburst monitoring and early warning technology based on equivalent drilling method[J].Chinese Journal of Geotechnical Engineering,2011,30(11):2346-2351.
[6]成云海,姜福兴,胡兆锋,等.埋深千米综放采场沿空巷道冲击地压防治研究[J].岩石力学与工程学报,2016,35(增刊1):3000-3007.CHENG Yunhai,JIANG Fuxing,HU Zhaofeng,et al.Prevention and control of coal burst on gob-side entry in deep coal seam with fully mechanized sublevel caving mining[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(Sup 1):3000-3007.
[7]齐庆新,窦林名.冲击地压理论与技术[M].徐州:中国矿业大学出版社,2008:93-97.
[8]陆振裕,窦林名,徐学锋,等.钻屑法探测巷道围岩应力及预测冲击危险性探究[J].煤炭工程,2011(1):72-74.LU Zhenyu,DOU Linming,XU Xuefeng,et al.New discovery on drilling cuttings method to detect surrounding rock stress of mine roadway and predict mine pressure bumping dangers[J].Coal Engineering,2011(1):72-74.
[9]赵伏军.动静载荷耦合作用下岩石破碎理论及试验研究[D].长沙:中南大学,2004.
[10]胡翔凯.表镶CBN钻头研制及其岩石钻进负载特性试验研究[D].哈尔滨:哈尔滨工业大学,2015.
[11]艾林,周明顺,张杰,等.基于煤岩脆性指数的煤体结构测井定量判识[J].岩性油气藏,2017,29(2):139-144.AI Lin,ZHOU Mingshun,ZHANG Jie,et al.Quantitative identification of coal structure based brittleness index by logging data on coal rock[J].Lithologic Reservoirs,2017,29(2):139-144.
[12]王昕.振动钻削新钻削力模型及定、变参数振动钻削的研究[D].长春:吉林大学,2004.
[13]徐连满.煤矿冲击地压钻屑温度检测理论及应用[D].阜新:辽宁工程技术大学,2012.