摘要
钻杆作为坑道钻探装备的重要组成部分，是煤矿坑道钻探施工的必备工具，其疲劳性能直接影响着坑道钻探作业的安全稳定进行；国内外针对煤矿坑道钻探用外平钻杆疲劳失效的研究工作较少，且缺乏必要的疲劳试验手段。本文在分析和总结前人研究现状与存在问题的基础上，选取φ63.5mm1500mm摩擦焊接式外平钻杆作为研究对象，取得以下主要研究成果：
（1）依据钻杆在井下工作时的运动状态，建立了井下空间坐标系，推导出了钻杆的微分几何方程、微分平衡方程、几何方程、本构方程以及钻杆纵横弯曲变形方程与钻杆弯曲半波方程；依据压杆稳定原理推导了钻杆最大弯曲应力计算公式，对钻孔-钻杆的约束关系进行了分析；
（2）优选了适用于钻杆疲劳寿命分析的疲劳寿命预测方法，详细分析了钻杆疲劳裂纹的萌生、扩展机理；基于裂纹扩展预测方法推导了钻杆疲劳寿命计算公式；
（3）以钻杆疲劳寿命计算公式为基础，利用ANSYS Workbench有限元分析软件提出了一种钻杆疲劳寿命仿真分析方法，实现了钻杆钻进过程的疲劳仿真，为钻杆疲劳寿命预测提供了条件；
（4）研制的大能力钻杆实物弯扭复合疲劳试验机，填补了国内空白，试验机试验转矩300Nm-15000Nm任意可调，转速0-800rpm无级可调，钻杆试验长度9000mm，为国内长轴类产品的疲劳分析提供了实物试验手段；
（5）完成了三组钻杆极限条件下的疲劳试验，进行了三个煤矿的钻杆使用情况调研，结果验证了疲劳仿真分析方法的准确性，检验了钻杆疲劳寿命预测的研究成果，为各种规格钻杆的疲劳寿命预测奠定了良好的基础。
As an important component of gallery drilling equipment, the drill pipe is thenecessary tool for drilling operation in underground coal mines. Its fatigue performanceinfluences directly the safe and stable operation of drilling in gallery. Aiming at a few ofresearch on invalidation due to fatigue of outer flat drill pipe and lack of necessary meansof fatigue test, the paper, on the basis of analysis and summing up the previous research andthe existing problems, selected φ63.5mm1500mm friction-welded outer flat drill pipe asresearch object, has obtained the following research results:
（1）According to the movement status of drill pipe during drilling in undergroundcoal mines, the underground space coordinate system was established, differentialgeometry equation, differential equation of equilibrium, geometry equation, constitutiveequation, equation of vertical and horizontal bending deformation, half wave bendingequation of drill pipe were derived. The formula for calculation of the maximum bendingstress of drill pipe was deduced from the principle of strut stabilization. The constraintrelation of borehole and drill pipe was analyzed.
（2）The method suitable to analysis and prediction of fatigue and life of drill pipewas optimized. The mechanism of the generation and extension of fissures due to fatigue ofdrill pipe was analyzed in detail. On the basis of the method for prediction of extension offissures, the formula for fatigue and life of drill pipe was derived.
（3）On the basis of the calculation equation of fatigue and life of drill pipe, the t finiteelement software ANSYS Workbench was used to put forward a emulation method forfatigue and life of drill pipe, realizing emulation of fatigue of drill pipe during drilling,providing condition for prediction of fatigue and life of drill pipe.
（4）A composed fatigue tester for real torsion of drill pipe of great capacity wasdeveloped, filling the gap in China and abroad. The torque of the tester can be adjustablefrom300Nm to15000Nm, rotation speed is0-800rpm with steeples adjustment. Thetested length of drill pipe is9000mm，providing testing approach for analysis of fatigue ofproducts with long axis.
（5）The fatigue test of three sets of drill pipe was conducted under limit conditions.Investigation of drill pipe usage in three coal mines was carried out. The results verified theaccuracy of emulation method of fatigue，checked the research results on prediction offatigue and life of drill pipe, establishing a good basis for prediction of fatigue and life ofdrill pipes of different specifications.
引文
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