... Artificial Intelligence sandstone specimen tension test specimen Upstream Oil & Gas mineral vein incipient rock discontinuity Reservoir Characterization direct tension test rock discontinuity discontinuity incipient bedding plane incipient discontinuity hydraulic fracturing...

...- iments by using RMT-150B rock mechanics testing system and got the influencing law of following fac- tors such as submergence, confining pressure and ratio of height to diameter on YD. The sizes and mechan- ical properties of sandstone specimens are showed in Table 2. 3.1 Influence of submergence on YD...

... investigated and variable cross-section split Hopkinson pressure bar apparatus is adopted to conduct uniaxial impact compressive tests. Four groups of sandstone specimens are involved. It is found that fracture surface energy of sandstone specimen decreases because of the stress transform between sandstone...