The Loading Rate Effect on the Fracture Toughness of Marble Using Semicircular Bend Specimens

Table 1

Fracture test results of rock specimens under the quasistatic load.

No.	Control rate (mm/min)	(s)	Log time	Fracture toughness (MPa·m^0.5)	Loading rate (MPa·m^0.5s^-1)	Log loading rate
S-2	0.01	566	2.7528	0.5407	0.0010	-3.0199
S-3	0.01	781	2.8927	0.5379	0.0007	-3.1620
S-6	0.01	745	2.8722	0.5748	0.0008	-3.1126
S-7	0.1	212	2.3263	0.6434	0.0030	-2.5178
S-8	0.1	131	2.1173	0.7228	0.0055	-2.2582
S-9	0.1	88	1.9445	0.6820	0.0077	-2.1107
S-10	1	6.00	0.7782	0.6465	0.1078	-0.9676
S-11	1	5.75	0.7597	0.6533	0.1136	-0.9446
S-1	1	8.91	0.9498	0.6625	0.0744	-1.1286
S-13	10	1.1656	0.0665	0.6810	0.5842	-0.2334
S-14	10	1.2346	0.0915	0.7575	0.6135	-0.2122
S-15	10	1.3326	0.1247	0.7105	0.5332	-0.2731
S-16	100	0.1426	-0.8459	0.8788	6.1627	0.7898
S-17	100	0.1836	-0.7361	0.9317	5.0746	0.7054
S-18	100	0.1706	-0.7680	0.8108	4.7526	0.6769