Research on Vibration Propagation Law and Dynamic Effect of Bench Blasting

Abstract

To address the problem of damage to adjacent buildings (structures) caused by bench blasting construction, blasting in a sand and gravel mine in Guizhou Province was used as the background. Through on-site monitoring and numerical simulation, the blasting vibration propagation law and dynamic effect characteristics under the joint action of different bench heights and horizontal distances were studied. The regression model was established. The results show that: the peak vibration speed in all three directions with the increase in the horizontal distance of the burst center is a decaying trend, and the field measurements are basically consistent with the safe vibration speed and do not exceed 1.5 cm/s, so the house is in a safe state; shear stress with the increase in the horizontal distance of the burst center strictly decays, so the source of the shear stress and vibration speed decay faster in the near zone, with the slow decay in the far zone; analysis found that the shear stress and vibration speed are quadratic and exponential. Through the analysis of the regression model, it is obtained that there is no co-linearity among the influencing factors, which has a significant effect on the regression equation and regression coefficient, and so the multiple linear regression equation fits well. The model can predict the blast vibration intensity, which can be used as a safety criterion for buildings under the action of blasting, and provides a reference for blast vibration control, hole network parameters, and the design index.

The Effect of Preloaded Compressive Stress and Curvature of Defect on Blast-Induced Fracture Behavior by Caustic and Numerical Models

“…where z 0 is the distance between the reference plane and the specimen; s(x, y) represents a light surface. When the light passes through the specimen vertically, Equation (1) can be simplified to Equation (2). w = −z 0 grad∆s(x, y)…”

“…Blasting is a traditional and effective construction method, which is widely used in tunnelling, mining, and other types of hard rock engineering [1,2]. Since rock or rock-like materials contain inherent defects (such as holes, joints, and cracks), such defects affect stress wave propagation, and thereby influence fracture mode and crack propagation in the materials [3][4][5].…”

Decay Law of Supercritical CO2 Phase Transition-Induced Shock Waves in Rocky Media

“…After the high-pressure gas impacts the rock body, incident rock body stress is formed, which is greater than the rock body rupture pressure, and the rock body becomes damaged. Regarding the rupture pressure of CO 2 phase change-impacted rock mass, the most widely used method is the TNT equivalent method, which considers the fact that the rupture pressure is related to the volume of the CO 2 reservoir tube, the strength of the shear sheet, and the external pressure of the fracturing tube [15]. In addition, Sun [16] fitted the corresponding working conditions using Matlab, and combined the rock breaking pressure magnitude with the JWL equation; alternatively, Guo [17] performed an energy analysis on the root-mean-square (RMS) of vibration data to quantify the total energy of the rock breakage.…”

Analysis of the Tunneling Blast Safety Criterion Based on Longitudinal Shocks

“…At present, although scholars have made several eforts in studying the blasting propagation law, most of the studies are based on on-site monitoring data and simplifed empirical formulas, which are too idealistic and lack accuracy in refecting the actual engineering blasting vibration situation [8][9][10]. At the same time, some scholars also use new research methods to study the blasting vibration law, such as using neural network technology [11][12][13], signal noise reduction [14,15], transient fnite element analysis [16], coupled Lagrange and Euler [17], Jones-Wilkins-Lee (JWL) equation of state [18], and wavelet packet decomposition [19] to summarize the blasting vibration law. However, these methods ignore the infuence of vibration frequency and duration, resulting in certain limitations.…”