Study on Preliminarily Estimating Performance of Elementary Deep Underground Engineering Structures in Future Large-Scale Heat Mining Projects

Table 1

Different wall temperatures, radii of the tunnel, and rock types.

(°C)	70	90	110	130	150
(m)	1.0	1.5	2.0	2.5	3.0
Rock type (α (m^2/d))	Granite (0.1134)	Gneiss (0.0992)	Limestone (0.0827)	Basalt (0.0742)	Dry shale (0.0650)