Force-Penetration Curves with a Button Bit in the Percussive Drilling
Force-Penetration Curves with a Button Bit in the Percussive Drilling
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冲击钻孔中使用球齿钻头的力贯入曲线
DOI：
10.2473/journalofmmij.126.512
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
S. Fukuda
中科院分区：
文献类型：
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作者：
K. Fukui;S. Okubo;M. Koizumi;A. Shioda;T. Matsuda;S. Fukuda
力-贯入关系被认为与钻头-岩石界面处的变形和断裂机制密切相关。在这项研究中，开发了一种可以轻松更换活塞、杆或钻头的试验机，用于模拟现场冲击钻进的实验室冲击侵彻试验。对 Inada 花岗岩进行了一系列使用球齿钻头的冲击钻进试验，以检查和讨论钻进性能。在沿杆相距1.91 m的两个位置测量应力波，然后通过测量的应变/应力波计算球齿钻头的力-贯入曲线。主要结果如下：1）钻头走时延迟可以用狭缝钻头模型来表示。2）室内试验中力-贯入曲线斜率的变化与原位冲击钻探非常相似。3）尽管力-贯入曲线斜率分散性较大，但岩石表面的弹性变形几乎恒定。
A force-penetration relationship is considered to be closely related to the deformation and fracture mechanism at the bit-rock interface. In this study, a testing machine in which a piston, a rod or a bit can be easily changed was developed for laboratory impact-penetration test simulating the in-situ percussive drilling. A series of percussive drilling tests with a button bit against Inada granite were carried out to examine and discuss the drilling performace. Stress waves were measured at two locations 1.91 m apart along the rod, and then force-penetration curve of the button bit was calculated by measured strain/stress wave. Main results are summarized as follows:1) Delay of traveling time at bit can be expressed by a slit bit model.2) Variation in the slope of force-penetration curves in laboratory tests was very similar to that in in-situ percussive drilling.3) In spite of large scatter in the slope of force-penetration curves, the elastic deformations of rock surface were almost constant.