酸性环境下交叉裂隙类岩石力学特性研究OA

To investigate the influence of intersecting fissure angles on the mechanical properties of rock-like materials under acidic conditions,conventional triaxial compression tests were conducted on speci-mens with different pH values(3,5,7)and intersecting fissure angles(no fissure,30°,60°,90°),while si-multaneously monitoring the evolution of ultrasonic waves during compression to explore both mechanical and acoustic characteristics of fractured rock.The results indicate that the deviatoric stress-strain curves of the specimens can be divided into four stages:compaction,elasticity,yielding,and failure.Under the same pH,the peak stress of the specimens exhibits an exponentially negative correlation with increasing fis-sure angle.At the same fissure angle,as the pH decreases,the volumetric strain expansion point of speci-mens with 60° and 90° fissures occurs earlier.All intact specimens(without fissures)exhibited splitting fail-ure,while specimens with fissures showed shear-splitting failure.The ultrasonic monitoring data revealed that under the same pH,the initial wave velocity and failure wave velocity of the specimens followed the or-der:no fissure＞60°＞30°＞90°.The deviatoric stress-strain curves of the 90° fissured specimens exhibit-ed significant strain-softening behavior after reaching the peak stress,accompanied by a relatively small de-cline in wave velocity.