A Study of Blast Vibration Propagation Law under Negative Altitude Terrains

Abstract

The propagation characteristics of blast waves and the prediction accuracy of blast vibration velocities along negative slopes are important because those can be used to guide engineering application and theoretical research. In this paper, the wave theory was applied to better understand the propagation mechanism of blast waves along negative slopes. Regression analysis was used for the Sadovsky and the CRSRI blast vibration velocity prediction models during on-site operations. The magnification of peak blast vibration velocity along a negative slope was introduced to determine the threshold altitude difference for the magnification effect to occur. Based on this parameter, the relative errors between the two prediction models were compared. The obtained results indicate that the superposition of incident and reflected blast waves on a negative slope creates the “slope effect” which locally amplifies the blast vibration velocity. The relative error of the CRSRI prediction model was as small as 17.53%, demonstrating a greater accuracy than Sadovsky’s prediction model. The magnification effect of a negative slope was observed at specific altitude differences and was more noticeable in the perpendicular direction. This paper creates a theoretical basis for studying the propagation mechanisms of blast vibration waves along negative slopes as well as predicting the blast vibration velocities.

The Influence of Vibrations Induced by Blasting Works in an Open-Pit Mine and Seismic Events in an Underground Mine on Building Structures—A Case Study

“…The dominant frequency of blast vibrations plays a crucial role in vibration persistence and its amplification or reduction characteristics in structures [22][23][24]. Several methods and models have been developed to predict and optimize blast-induced ground vibrations [25][26][27][28]. Guo and Li proposed a hybrid intelligent model using a least-squares support vector machine (LSSVM) optimized with a particle swarm algorithm (PSO) for vibration prediction [10,29].…”

Research on Vibration Propagation Law and Dynamic Effect of Bench Blasting

“…Zhu et al [10] proposed a new method to predict the vibration velocity of multi-hole trenching blasting of laminated rock masses, which can be used for optimizing engineering blasting design and the blasting of the slope. In order to study the propagation law of blast vibration in soft rock tunnels, Chen et al [11] carried out an analysis and research on the measured data by blast vibration tests and used nonlinear regression and Fourier transform methods to provide a reference for the optimization of blast design in the Muzhailing tunnel or similar soft rock tunnels; Lin et al [12] proposed a superposition prediction method based on the propagation and superposition principles of blast vibration signals; Xiao et al [13] obtained the slope blasting vibration propagation law by fitting the Sadovsky formula based on field blasting vibration monitoring data; Gao et al [14] used regression analysis for the Sadovsky and the CRSRI blast vibration velocity prediction models during onsite operations; Zhang et al [15], through field blasting vibration monitoring and numerical simulation, proposed the propagation law of blasting vibration velocity in the high side wall, elucidated the local elevation amplification effect of blasting vibration velocity, and modified Sadovsky's formula; Tian et al [16] used MATLAB to compile a signal processing program to analyze the propagation law of blast vibration in the stratum of shallow buried tunnels with oversized cross-sections. In terms of the research of dynamic response.…”

“…E(V) = 2.864 − 0.0018x 1 − 0.701x 2 − 0.498x 3 (14) where E(V) is the dependent variable and represents the ln value of the peak vibration velocity; x 1 represents the effect of the maximum amount of material in a single section on the peak vibration velocity; x 2 represents the effect of the flat distance from the burst center on the peak vibration velocity; x 3 represents the effect of the vertical distance from the burst center on the peak vibration velocity.…”