摘要
为确保已建运营洞库的稳定性,对邻近扩建洞库钻爆法开挖进行爆破振动分析,明确其对已建运营洞库稳定性的影响。依托国内某地下水封洞库工程,采用LS-DYNA建立三维数值计算模型,开展爆破振动模拟,并通过峰值振速、有效应力等评价其对运营洞库影响。研究结果表明:主洞室1监测点振速为0.1~0.8 cm/s,主洞室2监测点振速为0.045~0.350 cm/s,且最大峰值速度出现在与波的传播方向较为一致的方向;最大单段炸药量影响峰值振速(合速度)和有效应力,炸药量越多,振速和有效应力越高,最大峰值振速可增大200%;在最大单段炸药量小于65 kg的条件下,距爆源最近处的有效应力和合速度均小于安全规程规定,扩建洞库爆破施工对运营洞库影响较小,无安全隐患。结合现场爆破振动监测数据,验证了此模拟结果的正确性。
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.
作者
王敬奎
彭建宇
王者超
李康林
WANG Jingkui;PENG Jianyu;WANG Zhechao;LI Kanglin(CNOOC Petrochemical Engineering Co.,Ltd.,Qingdao 266101,Shandong,China;Institute of Deep Engineering and Intelligent,Northeastern University,Shenyang 110819,Liaoning,China)
出处
《隧道与地下工程灾害防治》
2024年第1期36-44,共9页
Hazard Control in Tunnelling and Underground Engineering
基金
国家自然科学基金面上资助项目(51779045)
辽宁省“兴辽英才计划”资助项目(XLYC1807029)
关键词
扩建洞库
爆破振动
稳定性
最大单段炸药量
expansion cavern
blasting vibration
stability
the maximum single-stage explosive quantity
