一般情况下，在岩石平巷掘进工作面的涌水中，在多台凿岩机集中打眼之前，固体颗粒含量最少。
Under normal circumstances, Drifting in the rock face of the gushing water, in the concentration of multiple drill rock drill before the solids content of at least.
本文在总结先拱后墙平巷掘进经验的基础上，根据岩石力学理论和平巷掘进原理，提出了平巷掘进的悬拱法。
Based on the theory of rock mechanics and the principle of drifting, the author proposed the suspension arch method of drifting in unstable strata.
岩石开挖后无支护而且安全的时间长度，即拱桥作用的时间，对于整个平巷掘进工艺循环有着很大的影响。
The length of time the rock safely can be left unsupported will greatly effect the overall drifting-operation cycle.
岩石开挖后无支护而且安全的时间长度，即拱桥作用的时间，对于整个平巷掘进工艺循环有着很大的影响。
The length of time the rock safely can be left unsupported will greatly effect the overall drifting-operation cycle.
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