Research Article

Dynamic Fracture Toughness and Dynamic Tensile Strength of the Rock from Different Depths of Beijing Datai Well

Table 4

Dynamic fracture toughness and dynamic tensile strength of 410 m.

(MPa·m1/2·s−1) (MPa·m1/2) (MPa)

11108912.89.3
14126514.79.8
15090315.510.3
16361115.510.7
16512116.212.8
21265216.813.9
17033917.014.9
23593717.516.4