黑河连接洞开挖爆破对黑河引水洞稳定性的影响  

Impact of Excavation Blasting of the Heihe Connection Tunnel on the Stability of Water Diversion Tunnel

作　　者：张博[1] 王一凡 王智阳 宋志强[3] ZHANG Bo;WANG Yi-fan;WANG Zhi-yang;SONG Zhi-qiang(Northwest Engineering Corporation Limited,Xi'an 710065,China;Shaanxi Water Development Group Co.,Ltd.,Xi'an 710024,China;Institute of Water Resources and Hydro-Electric Engineering,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,陕西西安710065 [2]陕西水务发展集团有限公司,陕西西安710024 [3]西安理工大学水利水电学院,陕西西安710048

出　　处：《水电能源科学》2024年第10期127-130,114,共5页Water Resources and Power

基　　金：国家自然科学基金项目(51479165)。

摘　　要：鉴于施工支洞与主隧洞交叉段复杂的受力状态及稳定性问题日益引起关注,提出了兼顾考虑现场位差爆破时炸药段位的群孔爆破简化方法,拟定相应的隧洞开挖爆破动力荷载,采用三维动力有限元分析方法,研究了黑河连接洞与黑河引水隧洞交叉施工过程中,连接洞开挖爆破振动对已建引水洞围岩稳定及衬砌结构安全性的影响。结果表明,黑河引水洞衬砌各关键点振动速度随着与爆破荷载距离减小而逐渐增大,最大振速主要发生在交叉口往交叉角为锐角方向17m范围内,衬砌振速在0.733~9.76cm/s之间;爆破的衰减速度较快,在进行爆破时,应考虑爆破点位置以减少多余的处理措施。根据规范要求,仅有1个监测点最大振速略高于最低标准,且超出时间很短,可认为实施八期爆破施工满足要求。Given the increasing attention to the complex stress state and stability issues at the intersection section between the construction branch tunnel and the main tunnel,a simplified group hole blasting method is proposed,which takes into account the explosive section placement and site-specific differences during blasting.The corresponding dynamic load for tunnel excavation blasting is formulated,and a three-dimensional dynamic finite element analysis method is adopted to study the impact of blasting vibration from the excavation of the Heihe connection tunnel on the stability of the surrounding rock and the safety of the lining structure of the already built water diversion tunnel during the intersection construction process.The results show that the vibration velocity at the key points of the Heihe water diversion tunnel lining gradually increases as the distance from the blasting load decreases,with the maximum vibration velocity occurring mainly within 17 meters in the direction of the acute angle from the intersection.The lining vibration velocity ranges from 0.733 cm/s to 9.76 cm/s.The blasting attenuation rate is relatively fast,and the location of the blasting point should be considered to reduce unnecessary treatment measures during blasting.According to the specification requirements,only one monitoring point showed a maximum vibration velocity slightly exceeding the minimum standard,and the duration of the exceedance was very short,suggesting that the implementation of eight-phase blasting construction meets the requirements.

关 键 词：连接洞开挖 引水隧洞 爆破荷载 振速 

分 类 号：TV672.1[水利工程—水利水电工程] TU751.9[建筑科学—建筑技术科学]