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1·Structural internal force is calculated by changing constant load of the main girder, the cable Angle, the length of unsupported deck.

通过改变主梁恒载重量、拉索倾角、无索区长度等结构参数，分析结构参数变化对结构受力的影响。

2·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。