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有道
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弱岩层 [ruò yán céng]
[地质] incompetent beds
- 金刚石钻头在坚硬致密弱研磨性岩层钻进时，经常出现钻头抛光和打滑现象，钻头时效、使用寿命都非常低。
When drilling extra-hard, compact and weak-abrasiveness formation, diamond bit is often polished and slipping. The drilling efficiency, run and the mean life are very low. - 已有的岩层与地表移动规律基本上以岩石强度为基础，很少顾及岩体中裂隙弱面的存在，及其对岩层与地表移动规律的影响。
The laws on the rock strata and surface movement that have known is basically based on the rock strength, not considering exist and the effect on the subsidence laws of the fissure and the weak face.
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