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The content of the research on changing the high shaft into a main ore-pass in Yong-Sha-Ba mine has three parts.
用沙坝矿高大副井改主溜井的研究内容主要分为三个部分：溜井放矿规律研究与振动出矿及相关技术的应用研究；
Based on field investigation the main causes of No 2 ore pass failure are analysed in this paper.
本文通过详细的现场调研，分析了造成2号溜井垮冒的主要原因。
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