Determining the Seepage Stability of Fractured Coal Rock in the Karst Collapse Pillar

Table 3

Symbol comment list.

Symbol	Physical meaning and interpretation	Symbol	Physical meaning and interpretation
,	Density and initial density, kg/m^3		New functions defined,
,	Porosity and initial porosity, %	, ,	Representation function and its various derivatives
	Comprehensive compression factor	,	New variables defined,
	Acceleration coefficient	,	Permeability and initial permeability, m^2
	Seepage pressure, MPa	,	Non-Darcy factor and initial factor, m^−1
	Time, s		Facial strength, N
	Seepage velocity, m/s		Integral constant
	Seepage displacement, m		Constant
	Dynamic viscosity, Pa·s		Height, m