Abstract
The fissure flawed red-sandstone under dynamic rainfall infiltration is one of the key factors determining the safety and reliability of red-sandstone embankment and slope. However, there is still a lack of investigations considering the combined influence of rainfall infiltration and flaw geometry on the mechanical behavior of fissure flawed red-sandstone. Therefore, the effects of rainfall intensity, rainfall duration, as well as prefabricated fissure inclination angle on the uniaxial compressive mechanical behavior of red-sandstone containing a prefabricated fissure were investigated by rainfall infiltration and uniaxial compression tests. The results show that fissure inclination angle, rainfall intensity, and duration have significant influences on the axial stress-strain characteristics of the red-sandstone specimen under uniaxial compression. The quantitative expression of the unconfined compressive strength, peak strain, modulus with fissure inclination angle, rainfall intensity, and duration are obtained. The unconfined compressive strength, deformation modulus, and elastic modulus of the red-sandstone specimen present negative relationships with rainfall intensity and duration, while a positive trend is observed for its peak strain. The unconfined compressive strength, deformation modulus, and elastic modulus of the red-sandstone specimen attain the minimums when the prefabricated fissure inclination angle is 45°, while its peak strain reaches the maximum at this time. The ultimate failure modes, crack characteristics, and types of the red-sandstone specimen under uniaxial compression after rainfall infiltration are discussed according to the photographic monitoring in uniaxial compression tests. The meso-level failure mechanism of the red-sandstone specimen under uniaxial compression after rainfall infiltration is evaluated on the basis of the meso-morphology of the specimen’s fractured surface. The influences of prefabricated fissure inclination, rainfall intensity, and duration on the variations of the red-sandstone specimen’s crack growth angle under axial compression are also analyzed.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call