Based on field investigation the main causes of No 2 orepass 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。
2
Within the orepass, 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。
3
Orepass 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.