A rock mass integrity calculation model considering the influence of axial cracks
Massiveness of rock mass is an important index in the field of geotechnical engineering.The most common method is using the longitudinal wave velocity of the rock mass to reflect the massiveness of rock mass.However,the integrity of the rock mass as shown by the acoustic measurements cannot take into account the impacts of axial impact due to the restriction of the longitudinal wave propagation of elastic waves.By using in-situ sonic wave testing and rock sample fracture detection,a model for calculating the massiveness of rock mass while taking into account the rock fracture orientation and length was established in this study.The influence of fractures with various orientations on the measured values of acoustic waves in situ was then analyzed by in situ testing and comparison with conventional massiveness of rock mass calculation.The findings indicate that the direction and length of the fissure have a major effect on the acoustic wave's measured value,the extent of which depends on the angle between the fissure's growth direction and the direction in which the acoustic wave is being detected.The established model is based on the changes in the fracture parameters in the rock mass and the variation of the actual acoustic measurements to correct the acoustic measurements.The calculated intactness index of rock mass overcome the problem that the intactness index of rock mass obtained by traditional methods do not fully reflect the integrity of the rock mass.
rock mechanicsrock mass integritycracklongitudinal wave velocityrock mass quality evaluation
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