Effects of Different Conditions of Water Cooling at High Temperature on the Tensile Strength and Split Surface Roughness Characteristics of Hot Dry Rock

Table 1

Mineral composition.

	Mineral composition
	Quartz	Mica	Potash feldspar	Plagioclase, etc.	Pyroxene and hornblende
Colour	White transparent, etc.	Black and white, etc.	White and red, etc.	White and grey, etc.	Black and brown
Chemical composition	, etc.	and Fe, etc.	, etc.	, etc.
Content (%)	26.1	8.9	36	25.2	3.8
Particle size (mm)	0.1–2.1	0.35–1.2	0.75–4	2–2.5	—
Coefficient of thermal expansion (1/°C)					—

Note. The thermal expansion coefficient of mineral composition comes from the network.