Numerical Simulation of Surface Vibration Propagation in Tunnel Blasting

Abstract

In order to better study the propagation law of tunnel blasting in mountain landforms, taking the excavation blasting project of the Yangliu tunnel along the Yinsong expressway in Guizhou as the research object, the propagation law of vibration waves to tunnel blasting under the mountain tunnel was analyzed based on the ABAQUS finite element software and compared with the field monitoring data. The results show the peak vibration velocity of numerical simulation. Generally, the simulation value is slightly larger than the field monitoring value, but the average error of closing speed is less than 25% and the maximum error is less than 45%. The component velocity of surface peak vibration under blasting to load is the largest in the vertical direction. The “cavity effect” formed by the side-passing tunnel wall has the most significant amplification effect on the peak vibration velocity in the X direction of the rock and soil above it, which is about 1.62∼1.85 times and the resultant velocity is enlarged by 1.27∼1.45 times. Blasting vibration waves spread to the surface in the form of spherical waves inside the mountain, causing the vibration center of the surface to move to the area with lower elevation. The “cavity effect” caused by the side-through tunnel and the shift of the surface diffusion center to the lower part together led to the peak velocity of the lower measuring point of the Yangliu tunnel being much higher than that of the higher measuring point. The research results of this paper have certain reference significance in controlling the influence of underground blasting vibration on residential buildings in mountain areas.

Study on Mechanism of Cumulative Directional Blasting of Brittle Karst Limestone in the Guizhou Province

“…Liu et al [7] improved and perfected the presplitting blasting technology with two test methods: groove-shaped energy and shaped charge coil presplitting blasting. Hu et al [8,9] established the rock failure criterion and analyzed the propagation law of vibration wave in Guizhou tunnel blasting engineering based on numerical simulation software. Te results show that the peak value of vibration wave in the direction of energy accumulation is signifcant.…”

Spatial Variation Law of Blasting Vibration in Layered Strata under Blasting Excavation of Subway Tunnel

“…In existing research, scholars usually ft the Sadovsky formula or other empirical vibration propagation formulas to get the blasting vibration propagation law on the ground surface based on the feld monitoring data [2,[6][7][8]. Alternatively, researchers utilize numerical simulation methods to investigate the distribution pattern of blasting vibration on the ground surface [9][10][11][12]. A review of the currently available literature reveals that there is a lack of research on the propagation law of blasting vibrations in the geological layers [13,14].…”

Analysis of the Tunneling Blast Safety Criterion Based on Longitudinal Shocks

“…Terefore, predicting the propagation law of blasting vibration waves has become a crucial aspect of blasting problems research [7]. 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.…”