Experimental Investigation of the Relationship between the P-Wave Velocity and the Mechanical Properties of Damaged Sandstone

Table 1

Characteristics of damaged specimens after high-temperature treatment.

Specimen; number	/°C	MCR; /%		VCR; /%		/m/s		UCS; /MPa		E/GPa
		ES	AV	ES	AV	ES	AV	ES	AV	ES	AV
A1	20	—		—		4193		60.2		11.0
A2	20	—		—		4083		62.7		10.1
A3	20	—	—	—	—	4286	4262	65.8	62.5	12.0	11.1
A4	20	—		—		4487		61.4		11.4
B1	400	−0.214		0.134		4593		71.4		13.5
B2	400	−0.229		0.113		4462		73.8		14.2
B3	400	−0.236	−0.233	0.127	0.123	4451	4468	69.4	70.9	12.6	13.3
B4	400	−0.251		0.118		4367		68.9		12.8
C1	500	−0.231		0.337		4068		65.4		10.8
C2	500	−0.246		0.331		3956		62.8		9.2
C3	500	−0.253	−0.247	0.351	0.334	3873	3952	59.7	63.3	8.9	10.0
C4	500	−0.259		0.316		3912		65.1		10.9
D1	600	−0.286		0.798		3700		50.2		6.7
D2	600	−0.279		0.847		3386		48.6		6.1
D3	600	−0.281	−0.278	0.812	0.808	3761	3515	51.4	51.2	6.9	6.6
D4	600	−0.267		0.776		3214		54.6		6.8
E1	700	−0.298		1.357		3567		39.6		4.8
E2	700	−0.287		1.376		3200		41.6		4.3
E3	700	−0.292	−0.289	1.314	1.336	3461	3339	42.9	40.4	5.6	4.6
E4	700	−0.279		1.296		3128		37.6		3.7
F1	800	−0.301		2.272		2721		27.2		3.1
F2	800	−0.293		2.314		2613		24.4		2.4
F3	800	−0.296	−0.293	2.183	2.248	2704	2644	25.3	25.1	2.6	2.6
F4	800	−0.283		2.223		2539		23.5		2.1

Note: T is the temperature, MCR is the mass change rate, VCR is the volume change rate, is the P-wave velocity, UCS is the uniaxial compressive strength, E is Young’s modulus, ES is each specimen, and AV is the average value.