Abstract
In burst-prone deep underground engineering, seismic waves generated from a near-field ground motion event may play a critical role in causing localized rockburst damage. Accurate estimation of near-field ground motions around excavations is important for seismic hazard risk assessment and dynamic rock support design in underground engineering. During the excavation of an underground cavern, stress redistribution in the surrounding rock leads to the formation of damage zones, including the excavation damage zone (EDZ) and excavation fracture zone (EFZ). The poor properties of the rock in the damage zones cause the wave velocities of the rock mass to decrease and the dynamic wave interaction to change, thereby affecting the ground motions around the excavation. This paper studies the near-field ground motion behavior and reveals the control effect of the seismic wave velocity in the damage zones on the near-field ground motions by the aid of the finite fracturing source model (FFSSM). The research results provide a new knowledge of the influence of excavation disturbance on the ground motion distribution around the excavation, and provide new ideas for the seismic hazard risk assessment and prevention in underground engineering.
Highlights
With the flourishing development of China’s economy, infrastructure construction under complex geological conditions has gradually increased, especially deep hydropower engineering and energy mining projects in the western region
The original contributions presented in the study are included in the article, further inquiries can be directed to the corresponding author
All authors have read and agreed to the published version of the manuscript
Summary
With the flourishing development of China’s economy, infrastructure construction under complex geological conditions has gradually increased, especially deep hydropower engineering and energy mining projects in the western region. This paper focuses on parameter analysis, that is, adjusting parameters to simulate different cases, so as to study the distribution of ground motion around excavation under different conditions and reveal the control effect of seismic wave velocity in the damage zones on the near-field motion. This paper focuses on studying the influence of the seismic wave velocity in the damage zones on the amplification effect On this basis, the following scheme is set up, as shown in Figure 6C below. The wave velocities in the EDZ of Case 1 to Case 4 are 0.95, 0.9, 0.8, and 0.7 times of the wave velocity in the EIZ, and the wave velocity in the EFZ is 0.9, 0.8, 0.6, and 0.4 times the wave velocity in the EIZ, respectively
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