在旋转式钻进过程中，金刚石钻头与岩石接触界面动摩擦特性的研究是岩石破碎机理研究的重要内容。为了研究关键摩擦参量的变化规律，利用自主研发的钻进模拟系统，通过应力波精确地、可重复地测量出钻头与混凝土试样之间随时间变化的关键参量，可直接获得轴压力和摩擦力，进一步计算出相对滑动速度、滑动位移以及摩擦系数。结果表明：金刚石钻头与试样之间的相对滑动速度和滑动位移与旋转加载速率相关性较大，随其增加而增大；界面动摩擦系数随冲击速度的增高而增大；在每次冲-旋加载过程中，试验获得的动摩擦系数基本恒定，不受轴向冲击加、卸载过程的影响，稳定动摩擦力与应力波峰的持续时长一致，该时长随着冲击速度的增加而逐渐缩短，揭示了冲-旋加载作用下金刚石钻头与岩面之间动态摩擦的特征。
Abstract
In rotary drilling process，study of dynamic friction characteristics between drill bit and concrete samples interface is an important issue of rock crushing mechanism. In order to study the variation of the key parameters of friction, based on self-developed drilling simulation system, the key parameters can be measured accurately and repeatedly by stress wave and axial pressure and friction can be obtained directly, and the relative sliding speed, sliding displacement as well as friction coefficient can be further calculated. The results have shown that the relative sliding speed and sliding displacement between diamond drill and rock interface are highly related rotary loading rate and will increase with the increase of rotational speed. Interfacial dynamic friction coefficient will increase with the rise of impact velocity. In each impact-rotary loading process, the experimental dynamic friction coefficient keeps almost constant and is not affected by the process of axial impact loading-unloading, the duration of stable dynamic friction is nearly equal to the length of stress wave peak, the time gradually shortened with the increase of impact velocity, which revealed the characteristics of dynamic friction between drill bit and rock under impact-rotational loading.
关键词
冲-旋加载 /
界面滑动 /
试验模拟 /
动摩擦
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Key words
impact-rotation loading /
interface sliding /
experimental simulation /
dynamic Friction.
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