摘要
为准确预测矿井冲击地压,采用钻杆推力、钻杆转速及动态钻屑量相结合的方法判断冲击地压的危险性。通过对新型钻机钻孔过程中煤岩切削破碎模型、钻杆的力学分析,建立钻头、钻杆的动力学模型和煤岩应力学模型,得出钻杆推力、钻杆转速、动态钻屑量与煤体应力的关系。从理论上分析了利用钻杆推力、钻杆转速、动态钻屑量测定煤体应力的可行性,提出了通过钻杆推力、钻杆转速与动态钻屑量相结合来预测煤矿冲击地压危险性的方法。利用推力-转速数据采集系统,测试了不同煤体应力下钻杆推力、钻杆转速的变化规律。试验结果表明:随着钻进深度的增加,钻杆推力、钻杆转速数据曲线均呈现出先增大然后稳定再减小的规律,但二者相比,转速稳定时间段较长。在相同参数条件下,钻杆推力、钻杆转速与煤体应力呈线性递减关系;动态钻屑量与煤体应力呈线性递增关系。多指标共同预测时,钻杆转速越大钻杆推力越大;反之,钻杆推力越小,二者一致性良好。研究结果可为煤矿冲击地压的预测提供技术参考。
In order to accurately predict the rock burst in mines,the risk of rockburst is judged by the combination of drill pipe thrust, drill pipe rotation speed and dynamic drilling cuttings.Through the mechanical analysis of the rock cutting model and the drill rod in the drilling process of the new drilling rig,the dynamic model of drill and drill rod and the mechanical model of coal and rock are established, and the relationship among thrust of drill rod,the speed of drill rod,the dynamic drilling chip and the stress of coal body is obtained.The feasibility of measuring the stress of coal body by drilling rod thrust,drill rod speed and dynamic drilling chip is analyzed theoretically, and the method of predicting the danger of rockburst through drilling rod thrust,drilling rod speed and dynamic drilling chip volume is put forward.The thrust and speed data acquisition system is used to test the change rule of drill pipe thrust and drill pipe rotation speed under different coal stress.The experimental results show that:with the increase of drilling depth,the drill rod thrust and the speed data curve of the drill rod first increase first and then decrease steadily,but the time period of the speed stability is longer compared to the two.Under the same parameters,drill pipe thrust and drill speed have a linear decreasing relationship with coal body stress,and dynamic drilling cuttings quantity has a linear increasing relationship with coal body stress.When multiple indicators are jointly predicted,the greater the drill pipe speed is,the greater the drill pipe thrust is.On the contrary,the smaller the drill pipe thrust is,the better the consistency between the two is.The research results provide a reference for prediction and research of rockburst in coal mines.
作者
王春华
刘亚强
王超
WANG Chunhua;LIU Yaqiang;WANG Chao(School of Mechanical Engineering,Liaoning Technical University,Fuxin 123000,China;School of Mechanical and Electrical Engineering,Shenyang Aerospace University ,Shenyang110000,China)
出处
《煤炭科学技术》
CAS
北大核心
2018年第11期133-139,共7页
Coal Science and Technology
基金
国家自然科学基金资助项目(51374120)
关键词
钻杆转速
钻杆推力
动态钻屑量
冲击地压
煤体应力
rotation speed of drill pipe
drill thrust
dynamic cuttings quantity
rockburst
coal stress
