Study on Multiparameter Precursory Information Identification of the Fracture of Yellow Sandstone

Table 1

Basic information of yellow sandstone.

Number	Diameter × height (mm)	Quality m (g)	Density (g/cm³)	Confining pressure σ3 (MPa)	Elastic modulus (Pa)	Uniaxial compressive strength (MPa)	Poisson's ratio	S wave velocity (m/s)	P wave velocity (m/s)	Loading and unloading speed (MPa/min)
sz-17	50.30 × 100.10	434.7	2.13	5	12.7	74.5	0.28	2670	3895	1
sz-18	50.02 × 100.02	436.2	2.19		12.9	75.1		2678	3927
sz-20	50.19 × 101.61	436.4	2.12		12.6	74.2		2673	3908
sz-21	50.20 × 101.30	436.6	2.20		13	75.4		2675	3896
sz-22	49.22 × 100.09	438.2	2.16		12.8	74.8		2674	3910