摘要
某水电站引水隧洞为特大断面隧洞,其施工支洞与引水隧洞主洞相交处的三岔口具有跨度大、应力集中、围岩情况不确定、自稳能力差等特点,同时,施工中需要进行挑顶扩挖导致工序转换复杂、对围岩扰动大、应力急剧变化、极易产生掉块、坍塌事故,需要根据不同的围岩类别采取相应的支护措施并加强隧洞安全监测以确保施工安全。阐述了对三岔口部位开挖采用的施工方法进行的研究。
The headrace tunnel of a hydropower station has an extra-large section,and the intersection of the construction adits and the main tunnel of the headrace tunnel has the characteristics of large span,concentrated stress,uncertain surrounding rock conditions and poor self-stability ability.At the same time,the expanding excavation of the roof during the construction leads to complex process conversion,large disturbance to surrounding rock,rapid stress changes,and easy to cause falling blocks and collapse.According to different types of surrounding rocks,corresponding supporting measures should be taken to strengthen safety monitoring and ensure construction safety.The paper introduces the research on the construction method adopted for the excavation of intersection.
作者
吴桃
赵云龙
刘胜虎
WU Tao;ZHAO Yunlong;LIU Shenghu(Sinohydro Bureau 10 Co.,Ltd.,Chengdu Sichuan 610036)
出处
《四川水力发电》
2023年第4期14-18,共5页
Sichuan Hydropower
关键词
水电站引水隧洞
特大断面隧洞
施工支洞
三岔口
监测
支护措施
施工方法
Headrace tunnel of a hydropower station
Extra-large section tunnel
Construction adits
Intersection
Monitoring
Supporting measures
Construction method
