| 冲击回转碎岩机理探讨 |
| 投稿时间：2012-10-09 修订日期：2013-02-20 点此下载全文 |
| 引用本文：杨甘生.冲击回转碎岩机理探讨[J].钻探工程,2013,40(2):19-21.YANG Gan-sheng. Discussion on Rock Broken Mechanism of Percussive-Rotary Drilling[J]. Drilling Engineering, 2013,40(2):19-21. |
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| 中文摘要:地下岩体中，天然地存在有许多微观裂纹与节理。在冲击回转的联合作用下，冲击使近钻头的岩石发生裂纹断裂、破碎，形成破碎小坑；使远离钻头的岩石中的微观裂纹扩展、连通、甚至断裂。在离钻头更远区域，使岩石产生新的微观裂纹。回转使冲击产生的破碎小坑沿圆周方向扩大，并使钻头上的金刚石颗粒换位。在回转冲击的联合作用下，岩石中的裂纹不断产生、扩展、断裂，从而达到高速碎岩的目的。 |
| 中文关键词:冲击回转 碎岩机理 断裂力学 |
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| Discussion on Rock Broken Mechanism of Percussive-Rotary Drilling |
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| Abstract:The rock broken mechanism of percussive-rotary drilling was discussed preliminarily by fracture mechanics method. There are a lot of joints and micro-fissures in rock matrix. Shock forces make fissures in rocks nearby bit fracture, break and form crater let, make micro-fissures in rocks a little far from bit expand, joint and even break, and make rocks farther from bit generate new micro-fissures. Rotation enlarges the crater lets formed by shock along circumferential direction, and changes the positions of diamond particles on bit. |
| keywords:percussive-rotary rock broken mechanism fracture mechanics |
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