采用离散单元法，分析了当荷载、岩体的摩擦角、锚杆间距、锚杆方向和岩体的性质变化时，顶板的稳定性。
Discrete element method is used to analyze the roof stability in accordance with the variation of its loading, rock frictional Angle, bolt spacing, rock properties and bolt orientation.
理想实验的结果表明，利用伴随法反演底摩擦系数是合理且有效的。
Twin experiments show that the adjoint method can inverse the prescribed bottom friction coefficients perfectly.
文中采用传统的四球机法，对工投牌高扭矩钻具螺纹脂的摩擦系数进行了测试。
The paper measures the friction coefficient of Gongtou brand thread compounds for high torque drill tool.
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