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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Within the ore pass, rock & ore cause different frictional forces that can be divided into 3 type of static pressure and stress.

根据矿岩在溜井内产生摩擦阻力的不同，矿岩对溜井底部静压力可分为3种状态。

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Ore pass is extensively used in underground mining, but frequently troubles or stoppages are happened and up to now there is no quite satisfactory way to clear them.

溜井广泛用于矿山井下开采。经常发生的溜井堵塞故障，至今还没有妥善的处理办法。

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