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钻杆扭矩法是通过测试钻孔过程中钻机对钻杆输出扭矩的大小来判断煤矿冲击地压危险性的方法,具备许多传统方法不可替代的优点,是一种很有发展的预测预报方法。该文建立了钻屑过程中钻杆的力学模型,得出钻杆扭矩与煤体应力、煤体性质及钻进速度的关系,分析表明:钻屑过程中,煤体应力增大时,钻杆扭矩增大,钻屑推进力减小;钻屑推进速度增加时,钻杆扭矩增加,钻屑推进力增大;煤体强度增大时,钻杆扭矩增加,钻屑推进力增大。利用钻杆扭矩测试装置,测试了不同煤体应力条件下钻屑扭矩的变化规律。理论和实验结果均表明:使用相同的钻机及钻具,按照指定速度对同一性质的煤层打钻时,钻杆扭矩随着煤体应力的增大而增大,钻杆扭矩变化规律与煤体应力及钻屑量具有较好的一致性,通过测试钻杆扭矩的变化规律,得出钻孔处煤体应力场的分布化规律,进而预测煤层冲击危险性。研究结果为煤矿动力灾害预测预报提供一定的理论与实验基础。
Drill pipe torque method is a method of judging the danger of coal mine rock burst by testing the output torque of drill pipe to the drill pipe during drilling process. It has many advantages that traditional methods can not replace. It is a very promising method for forecasting and forecasting. The paper establishes the mechanical model of the drill pipe during drilling cuttings, and draws the relationship between the drill pipe torque and the stress of the coal body, the nature of the coal and the drilling speed. The results show that during the drilling cuttings, when the stress of the coal body increases, As the torque of drill rod increases, the propulsion force of drill cuttings decreases. When drill bit propulsion velocity increases, the torque of drill pipe increases, propulsion force of drill cuttings increases. When the strength of coal increases, the torque of drill pipe increases and propulsion force increases. The torque variation of drill cuttings under different stress conditions was tested by using the drill rod torque testing device. Both theoretical and experimental results show that when the same drilling rig and drilling tool are used to drill a coal seam of the same quality at the specified speed, the torque of drill pipe increases with the increase of the stress of the coal body. The stress and the amount of drill cuttings have good consistency. By testing the variation law of the drill pipe torque, the distribution law of the stress field in the borehole at the borehole is obtained, and then the coal seam impact risk is predicted. The results provide some theoretical and experimental basis for predicting coal mine disaster.