基于钻杆推力法结合钻杆位移预测围岩应力的研究

Study on prediction of surrounding rock stress based on drill pipe thrust method combined with drill pipe displacement

为准确预测矿井冲击地压的发生规律,基于钻杆推力法结合钻杆位移理论,建立钻杆力学模型,利用新型钻削设备,结合钻削采集测试试验。根据试验数据绘出在不同围压轴压下推力、位移随时间的变化曲线,对应力变化进行预测。根据建立动力学模型及公式推导进而得出预测冲击地压的规律,通过测试钻杆推力估算煤体应力的大小,进而预测冲击地压的危险性。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。

In order to predict the occurrence regularity of mine rock burst accurately,a mechanical model of drill pipe was established based on the drill pipe thrust method combined with the drill pipe displacement theory. The new drilling equipment was combined with the tests of drilling cuttings collection. The change curves of thrust and displacement with time under different confining pressures were obtained by using the experimental data,and the change of stress was predicted. Based on the establishment of dynamic model and the formula deduction,the laws of predicting rock burst were derived. The stress of coal body was estimated by testing the drill pipe thrust,then the risk of rock burst was predicted. The results provide a certain theoretical and experimental basis for the prediction and forecast of dynamic disaster in coal mine.