中文摘要：

通过对钻孔过程中钻杆扭矩及钻屑推力的力学分析,理论上给出了利用钻杆扭矩及钻屑推力判断煤体应力、煤体强度的可行性,提出通过测试钻孔过程中的钻杆扭矩和钻屑推进力来判断煤矿冲击地压危险性的方法。利用自行设计的扭矩–推力测试装置,对预制煤体相似材料试件进行了不同煤体应力、不同煤体强度和不同推进速度条件下的钻孔试验。研究结果表明:1单一因素影响下,钻杆扭矩与煤体所受应力存在线性递增关系,钻屑推力与煤体应力呈近似线性递减关系,且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。2钻杆扭矩和钻屑推力均与煤体强度呈线性递增关系。3同种煤岩体材料,相同压力条件下,钻进速度越快,钻屑扭矩越大,反之,钻屑扭矩越小。研究结果可为煤矿动力灾害的预测预报提供参考依据。

英文摘要：

The feasibility of judging the stress and strength of coal by drilling pipe torque and drilling thrust is given through mechanical analysis during the drilling process. On this basis, the way to judge the risk of rock burst by testing drilling pipe torque and drilling thrust is put forward. The drilling experiments on the prefabricated similar coal specimens are performed under different stresses and strengths of coal and advance speeds. A torque-thrust testing device is designed for these tests. The results show that:(1) Under the influence of a single factor, the drilling pipe torque linearly increases with the stress of coal, while the drilling thrust reduces linearly with the stress of coal. The variation rules of drilling pipe are consistent with those of the stress of coal and drilling volume. (2) Both the drilling pipe torque and the drilling thrust linearly increase with the increasing strength of coal. (3) For the same coal and rock materials under the same pressure, the faster the drilling speed, the larger the drilling cutting torque, and vice versa. The results are important for the forecast of dynamic disasters in coal mines.