ABSTRACT
The aim of this chapter is to reveal the damage and fracture evolution characteristics of bimsoils under uniaxial compression, triaxial compression, and splitting tensile stress, using the real-time ultrasonic technique. A series of laboratory experiments were conducted to investigate the relationship between the ultrasonic pulse velocity (UPV), transmission ratio (TR), attenuation coefficient (AC), and mechanical properties of bimsoils with different rock percentages, under uniaxial and triaxial stress paths. The ultrasonic wave was transmitted and received by a P-wave piezoelectric transducer and an S-wave piezoelectric transducer, and the ultrasonic travel time and amplitude were recorded by an ultrasonic detector during the whole deformation process of specimens. The relationship between the mechanical parameters and the ultrasonic parameters was established; in addition, the mechanical properties of bimsoils that are different from those of rock and soil were further confirmed by ultrasonic tests. Moreover, the cracking damage characteristics of bimsoils and the associated damage constitutive equations were established.
