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| The influence of blasting vibration of extended cavern on the stability of operating cavern |
| WANG Jingkui1, PENG Jianyu2, WANG Zhechao2, LI Kanglin2
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1. CNOOC Petrochemical Engineering Co., Ltd., Qingdao 266101, Shandong, China;
2. Institute of Deep Engineering and Intelligent, Northeastern University, Shenyang 110819, Liaoning, China |
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Abstract In order to ensure the stability of the existing operation cavern, the blasting vibration analysis of the drilling and blasting excavation of the adjacent expansion cavern was carried out to clarify its influence on the stability of the existing operation cavern. Based on a domestic underground water-sealed cavern project, ANSYS/LS-DYNA was used to establish a three-dimensional numerical calculation model to carry out blasting vibration simulation, and its impact on the operating cavern was evaluated by peak vibration velocity and effective stress. The results showed that the vibration velocity of the monitoring point in the main cavern 1 was 0.1-0.8 cm/s, and the vibration velocity of the monitoring point in the main cavern 2 was 0.045-0.350 cm/s, and the maximum peak velocity appeared in the direction that was consistent with the propagation direction of the wave. The maximum single-stage explosive quantity affected the peak vibration velocity(combined velocity)and effective stress. The more the explosive quantity, the higher the vibration velocity and effective stress, peak vibration velocity could be increased by up to 200%. Under the condition that the maximum single-stage explosive quantity was less than 65 kg, the effective stress and the combined velocity at the nearest distance from the explosion source were less than the values specified in the safety regulations. The blasting construction of the expansion cavern had little impact on the operating cavern and had no potential safety hazard. Combined with the on-site blasting vibration monitoring data, the correctness of the simulation results was verified.
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Published: 10 April 2024
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