Jointed rock blast vibration attenuation parameter predicting method and device
A technology of attenuation parameters and blasting vibration, which can be used in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., and can solve problems such as the uncertainty of blasting attenuation parameters
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[0040] As an implementation, the basic quality index of the rock mass satisfies: BQ=90+3R c +250K v .
[0041] where the R c is the uniaxial saturated compressive strength of rock, the MPa and the K v is the rock mass integrity index, where K v =(V m / V r ) 2 , V m is the elastic longitudinal wave velocity of rock mass, V r is the rock elastic longitudinal wave velocity, wherein there is a linear relationship between the BQ value and the RMR value.
[0042] Step S102, obtaining attenuation parameters corresponding to each set of the basic quality indicators of the rock mass and the joint angle characteristics.
[0043] Wherein, the attenuation parameters include attenuation coefficient and attenuation index.
[0044] In this embodiment, when estimating vibration damage, the attenuation formula is used to judge the vibration damage of structures and structures with Peak Particle Velocity (PPV) as the standard. In the decay formula, PPV is a function of site condition...
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