论文部分内容阅读
以露天矿开采为背景,基于牙轮钻单齿冲击压入破岩的机理,借助理论分析及现场实验,建立了牙轮钻的工作参数(进尺速度、钻杆轴压、转速)与岩体强度(黏聚力、内摩擦角)的对应关系。理论分析时,基于布西内斯科问题弹性力学解和Drucker-Prager塑性准则,给出了单齿压入破碎区域的几何形态,建立了单齿破岩体积与钻杆轴压、黏聚力、内摩擦角间的函数关系;并根据钻杆旋转一周单齿破岩体积的累积量和宏观破岩体积相等,建立了进尺速度、转速与单齿破岩体积的对应关系。理论分析的结果表明,单齿作用下,破碎区域基本呈椭球形,并在压入点附近的表层出现薄层破碎;进尺速度与转速呈线性关系,进尺速度与钻杆轴压呈3/2次方的关系,进尺速度与黏聚力呈-3/2次方的关系,内摩擦角对进尺速度的影响可以忽略。在鞍千矿南采区进行了牙轮钻钻进规律的现场实验,研究了进尺速度与钻杆轴压、转速、黏聚力间的对应关系,得到了与理论分析一致的结果。研究成果可以为牙轮钻工作参数的优化设计及岩体强度的动态测试提供依据。
Based on the open-cut mining, based on the mechanism of rock breaking with single-tooth roller impact, theoretical analysis and field experiments were carried out to establish the relationship between working parameters of roller cone drill (footage speed, axial pressure of drill pipe, Intensity (cohesion, internal friction angle) of the corresponding relationship. In the theoretical analysis, based on the Bursines’ problem of elastic mechanics and the Drucker-Prager plasticity criterion, the geometry of single-tooth press-in crushing zone is given and the relationship between single-tooth rock breaking volume and axial compressive stress and cohesion , And internal friction angle. According to the fact that the cumulative volume of rock breaking single rock and the volume of rock under macroscopically broken rock are equal in one rotation of the drill pipe, the corresponding relationship between the footage speed and rotation speed and the volume of rock breaking by single tooth is established. The results of theoretical analysis show that under the action of single tooth, the crushing area is almost ellipsoidal, and the surface layer near the press-in point appears thin layer. The linear relationship between the footage-in-speed and the rotation speed shows that the footage speed is 3/2 The relationship between the second party, footage speed and cohesion was -3/2 power relations, the internal friction angle on the footage speed can be ignored. A field test of roller cone drilling was carried out in the southern mining area of Anshan Qian Mine. The corresponding relationship between the footage speed and axial pressure, rotational speed and cohesion of drill pipe was studied. The results were consistent with the theoretical analysis. The research results can provide the basis for the optimization design of roller cone working parameters and the dynamic test of rock mass strength.