Abstract
Underground gas storage are often subject to external dynamic loads, blast vibrations, and seismic disturbances, since they function as backup areas for the strategic national energy reserve, supply and demand dispatch, and gas and energy storage. Currently, the research on dynamic response characteristics, dynamic stability, and disturbance control of underground gas storages under dynamic loads is still incomplete and of great practical importance to ensure national strategic security. Therefore, this paper takes the blasting project of the Sansheng tunnel, which passes through the national strategic gas storage reservoir, as the engineering background. Based on the geological conditions and rock characteristics, the dynamic response characteristics of the rock surrounding the tunnel and gas storage are studied using the finite element method. The peak vibration velocity distribution of the surrounding rocks at different blasting source distances is analyzed and compared with the theoretical formula. Subsequently, an asymmetric uncoupled blasting vibration control technique is proposed and used for field blasting. The results show that the numerical results are consistent with the theoretical formula. The blasting vibration velocity decreases exponentially with an increase in the blasting source distance. Overall, the proposed technique significantly decreases the average peak vibration velocity by 22.64% compared to the original vibration velocity.
Highlights
The current international situation is complex and volatile since the primary energy-producing regions are being affected by external disturbances and internal instability
By monitoring the variation of vibration velocity in the surrounding rock near the tunnel-gas storage reservoir, the real-time variation law associated with vibration velocity at different distances is obtained, and the variation law is compared and verified with the theoretical calculation results
To further control the blasting vibration velocity of surrounding rock near the tunnel and gas storage, an asymmetric charge blasting vibration reduction technique has been proposed; this approach allows the position of the explosives in the hole to be adjusted according to the safety level of the structure, vibration velocity requirements, and surrounding rock endowment conditions, thereby controlling the incident wave energy of the surrounding rock mass and achieving the purpose of vibration energy attenuation
Summary
The current international situation is complex and volatile since the primary energy-producing regions are being affected by external disturbances and internal instability. The propagation law of explosive-induced blast vibration waves at the tunnel palm surface is calculated using ANSYS/LS-DYNA software, and the three-dimensional (3D) vibration velocity distribution characteristics and vibration attenuation law of the surrounding rock mass between the tunnel and the gas storage are analyzed. Little research has been conducted on the dynamic vibration characteristics associated with the surrounding rock of FINITE ELEMENT MODELLING OF THE TUNNEL-GAS STORAGE RESERVOIR. By extracting the vibration velocity values in the X, Y, and Z directions at each monitoring point after blasting, blasting vibration distribution characteristics of the surrounding rock between the tunnel and gas storage reservoir were obtained (Figure 7). In the first step (distance less than 25 m) the blasting vibration is clearly reduced; while at the second stage (distance greater than 25 m), the vibration attenuation trends associated with asymmetric and original blasts are similar, and the reduction in vibration velocity is smaller
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