BLASTING, Volume. 40, Issue 1, 154(2023)
Study on Dynamic Stability of Toppling Dangerous Rock Mass under Blasting Vibration Considering Size Effect
The stability calculation is the key to prevent and control the geological disaster of dangerous rock collapse,which is of great practical and prediction significance.However,the quasistatic method cannot depict the influence of factors as the shape and geometric size of the dangerous rock mass,the frequency and initial phase on the actual blasting vibration load.Based on conventional pseudostatic analysis and the slice method,a blasting dynamic stability analysis method considering size effect is established.This calculation program is compiled by using MATLAB.The results indicate that the calculated minimum stability coefficients of dangerous rock mass vary periodically with the initial phase of the blasting seismic waves.For a given calculation with specific parameters,the coefficients are proximate to those calculated by conventional quasistatic analysis.The relative difference of these two calculations is between 5.1% and 8.2%,which indicates the calculation method and program are reasonable and effective.When the number of slices is 1,the calculated results of the program are equivalent to those calculated by traditional quasistatic method.The method proposed in this study provides a reference for dynamic stability analysis and evaluation for dangerous rock mass.
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QU Xinyu, LI Hongtao, YAO Qiang, LI Cheng, FENG Simin. Study on Dynamic Stability of Toppling Dangerous Rock Mass under Blasting Vibration Considering Size Effect[J]. BLASTING, 2023, 40(1): 154
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Received: Sep. 14, 2022
Accepted: --
Published Online: Jan. 22, 2024
The Author Email: Xinyu QU (qxy223891637@qq.com)