Pore permeability is the permeability of a single pore of a rock, while reservoir permeability is the equivalent value of pore permeability on the whole cross-section of the rock.
孔隙渗透率是单根孔隙的渗透率，地层渗透率是孔隙渗透率折算到整个地层截面积之上的渗透率。
The factor that affect the well lane stability has primarily: Round the rock kind, well lane position, tunnel stalk line direction, cross section size, break rock method etc.
影响井巷稳定性的因素主要有：围岩性质、井巷位置、巷道轴线方向，断面尺寸，破岩方法等。
The construction method of large cross section airbridge in soft rock is presented in this paper.
阐述了软岩中大断面风桥的施工方法。
The construction method of large cross section airbridge in soft rock is presented in this paper.
阐述了软岩中大断面风桥的施工方法。
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