用于中小规格冲击钻及旋转勘探钻具，凿进软岩层、中硬岩层。
For small rotary rock drill bits and rotary prospecting bits to cut soft, medium-hard rock.
以黏弹性流变模型理论为基础，建立软岩层、水泥环和套管流变耦合的力学模型。
Based on the theory of the viscoelastic rheological model, the coupled mechanical model of the soft rocks, the concrete sheath and the casing is developed.
阐述了软岩层回采巷道支护的关键问题，对不同岩性的回采巷道支护方法及改进方向进行了初步探索。
Expounded support key problems of soft rock actual mining roadway and probed into the support pattern along with improvement support methods for mining roadway.
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