Effects of Thermal Water Upwelling on Microclimate Change in the High Geo-Temperature Roadway

Table 2

Impermeability and thermal conductivity of strata in Sanhejian Coal Mine [34, 35].

Era	Period	Code	Lithology	Thickness (m)	Aquosity	Geothermal gradient ()	Thermal conductivity	Terrestrial heat flow ()
Cenozoic	Quaternary	Q	Clay, sand	220	Weak	3.5
Mesozoic	Cretaceous	K	Sandstone, glutenite, mudstone	391	Weak	2.8	2.74	76.6
	Jurassic	J	Sandstone, mudstone
Paleozoic	Permian	P	Mudstone, sandstone, coal, limestone	536	Weak	3.3	2.28	75.1
	Carboniferous	C				3.3	2.22	76.1
	Ordovician	O	Limestone, dolomite	500–742	Water abundance and strong permeability		2.94