This paper introduces the application about anchor cable jetting combined supporting in broken soft rock drift.

重点介绍了锚索喷注联合支护在碎胀软岩巷道掘进中的应用。

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The system model based on computer aided design and expert system techniques is established through analytical studying on the engineering data of rock drift tunneling.

通过对岩巷掘进工程资料的分析研究，建立了基于辅助设计和专家系统技术的系统模型。

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So we construct for the background by the Second Shizuishan Mining, tunneling of the coal road and rock drift, carried on research to single tunneling technique of the horizontal tunnel.

本文以石嘴山二矿煤、岩巷的掘进施工为背景，对水平巷道单巷掘进技术进行了研究。

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They are made of continental rather than oceanic rock, and seem to be a small part of the jigsaw puzzle of continental drift rather than genuine oceanic islands.

ECONOMIST: Mass extinctions