The working face mining distance can decrease when fracture occurs and the mining width increases.
当工作面宽度加大时，开始出现破裂的工作面推进长度减小。
When the mining width reaches to the mining subsidence starting distance, the mining subsidence will grow slowly.
当开采宽度达到地表移动起动距时，地表下沉缓慢增长；
The proper size of coal pillars and mining width for partial mining are studied with theory of continuum mechanics.
本文用连续介质力学的理论，探讨了条带法开采的合理条带尺寸。
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