Anisotropy of crack initiation strength and damage strength of coal reservoirs

HAO Xianjie,WEI Yingnan,YANG Ke,SU Jian,SUN Yingfeng,ZHU Guangpei,WANG Shaohua,CHEN Haibo,SUN Zhuowen

Table 1 Test results of axial longitudinal wave velocities of coal reservoir samples.

Bedding angle/(°) Sample No. Wave velocity/(km·s-1) 0 Z1 1.15 Z2 1.14 Z3 1.13 Z4 1.16 Z5 1.13 Z6 1.09 45 F1 1.18 F2 1.20 F3 1.19 F4 1.17 F5 1.07 F6 1.18 90 N1 1.17 N2 1.18 N3 1.21 N4 1.25 N5 1.10 N6 1.26