non-bearing surface
刚性支承面非自位滚动 rigid type bearing
放顶煤工作面与非放顶煤工作面的区别是,采空区充填系数小,顶板岩层运动剧烈,走向方向超前支承应力峰值较大。
The differences between the coal drawing face and non-coal drawing face are low stowing factor in the goaf, vigorous movement of roof, and high stress peak abutment pressure along the strike.
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