Developed study on the numerical bit, well bottom and the borehole face modeling method for PDC bit numerical experiment system.
开展了PD C钻头数值实验系统中数值钻头、数值井底以及数值井壁的建模方法研究。
The result shows that the borehole destruction occurs in the dynamic process of coal face advancing, and it is more stable when the borehole location is close to tailgate.
认为钻孔的破坏是随着工作面推进而发生的动态过程，布置在靠近回风巷侧钻孔更加稳定。
A distance that characterizes how far a logging tool measures into the formation from the face of the tool or the borehole wall.
表征测井仪器可以测量的从井壁(或仪器表面)到地层的探测距离。
According to the time to form the blasting free face and the time for the broken rock flying, the paper discussed the rational delay time of each functional borehole in deep borehole blasting.
根据爆破自由面形成的时间和破碎岩石飞行的时间，探讨了深孔爆破各作用炮眼的合理延期时间；
Because of the weak borehole sealing and inadequate use of the initial free face, the higher investment and unsatisfactory blasting effect still exist in the mine tunnel excavation blasting.
由于炮孔堵塞不牢和初始自由面利用不充分，井下平巷的掘进开挖爆破仍存在投入大、爆破结果欠理想等问题。
The shear stress on smooth blasting of pipe protecting borehole wall between free face and protecting face reaches as high as 3.
进行了光面护壁爆破和切缝护壁爆破技术的动态光弹性试验，获得了光面护壁爆破和切缝护壁爆破过程的等差条纹图。
The shear stress on smooth blasting of pipe protecting borehole wall between free face and protecting face reaches as high as 3.
进行了光面护壁爆破和切缝护壁爆破技术的动态光弹性试验，获得了光面护壁爆破和切缝护壁爆破过程的等差条纹图。
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