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一、取岩心原理及工具 1.原理: 根据冲击式凿岩原理传給钎尾的冲击力,使钎头的刃鋒揮入岩石中,每冲击一次后,钎子退回向反时針方向轉一定角度(如图1)。岩石受钎头冲击力而破碎,受水冲洗流出眼外,岩心部分未直接受冲击力而保持完整。但经試验結果來看:岩心呈圓形片状及半圆片状的約占30％。呈柱状(20毫米以上)約占25％,其它均呈块状。我們認为岩心呈柱状或不完全呈柱状的原因有以下几点: (1) 与眼深大小有关:岩心虽不直接受钎头的冲击力和剪切力作用,但因钎头在冲击和切削眼底环状面积时,岩心受震动面与岩体脫离甚至破碎,試验中也已証明了这一点:跟深在0米～1米时,岩心破碎量相当大,当眼深3米时,呈圆形片状的岩心就多一些,眼深超过5米以后(若岩心管直径不变)則呈圆形片状及柱状的岩心就逐漸增多。
First, take the core principle and tools 1. Principle: According to the impact of rock drilling principle passed to the impact of the end of the drill bit of the blade into the rock, each impact once, the solder back to the anti-clockwise turn A certain angle (Figure 1). The rock is shattered by the impact of the drill head and out of the eye by flushing with water. The core part is not directly affected by the impact and remains intact. However, the test results show that: the core is round and semi-circular flake about 30%. Was columnar (20 mm above) accounted for about 25%, others were massive. We believe that the core columnar or not completely columnar for the following reasons: (1) and eye depth size: Although the core is not directly affected by the impact of the drill head and shear force, but the drill bit in the impact and When cutting the annular area of the fundus, the core is separated from the rock mass by the vibration surface and even crushed. This has also been proved in the experiment: when the depth is between 0m and 1m, the core crushing amount is quite large. When the eye depth is 3m , A round pellet core more, more than 5 meters deep in the eye (if the core tube diameter unchanged) was round and columnar core shape is gradually increased.