齐热哈塔尔水电站工程深埋隧洞块状岩体岩爆区施工防护措施
发布时间：2018-12-29 15:43
【摘要】：以有效解决深埋隧洞工程施工中高地应力作用下的岩爆问题为目标,结合齐热哈塔尔水电站工程深埋引水隧洞的特点,针对不同位置、不同破坏模式的岩爆特点,采用了短进尺控制爆破开挖,配合应力解除爆破开挖、危石清理及高压水冲洗、及时喷射混凝土覆盖岩面、及时实施防岩爆锚固措施(包括快速锚杆、挂网、钢拱架等)和后续实施系统锚杆支护等一系列施工防护措施。结果表明:在板裂破坏与层裂破坏为主的区域,出现因锚杆角度不合适而出现持续破坏一般发生于中等岩爆区;局部应力集中严重的区域存在不规则块状弹射和剥落现象,一般发生于随机锚杆或系统锚杆的支护区;实际施工中应采用打设应力施放孔、在顶拱和掌子面范围内喷水、及时封闭开挖岩面等预防措施。研究成果可供其他地下工程岩爆区的施工防护参考。
[Abstract]:In order to effectively solve the problem of rock burst under the action of high ground stress in the construction of deep buried tunnel engineering, combined with the characteristics of deep buried diversion tunnel of Zizehattar Hydropower Station, this paper aims at the characteristics of rock burst in different positions and different failure modes. The short ruler controlled blasting excavation, combined with stress release blasting excavation, dangerous rock cleaning and high pressure water washing, timely spraying concrete covering rock surface, and timely implementation of rock explosion prevention anchoring measures (including fast anchor rod, hanging net, etc.) Steel arch) and subsequent implementation of a series of system bolting protection measures. The results show that in the areas where the plate fracture and spallation are dominant, the sustained failure occurs in the middle rock burst area due to the inappropriate angle of the anchor rod. The phenomenon of irregular ejection and spalling occurs in the area where the local stress concentration is serious, which usually occurs in the support area of the random bolt or the system bolt. In actual construction, some preventive measures should be adopted, such as setting stress holes, spraying water in the range of top arch and face, and closing excavation rock face in time. The research results can be used as a reference for the construction protection of other underground engineering rock burst areas.
【作者单位】： 中水北方勘测设计研究有限责任公司;
【基金】：国家重点研发计划(2016YFC0401801)
【分类号】：TV554
，
本文编号：2395017
[Abstract]:In order to effectively solve the problem of rock burst under the action of high ground stress in the construction of deep buried tunnel engineering, combined with the characteristics of deep buried diversion tunnel of Zizehattar Hydropower Station, this paper aims at the characteristics of rock burst in different positions and different failure modes. The short ruler controlled blasting excavation, combined with stress release blasting excavation, dangerous rock cleaning and high pressure water washing, timely spraying concrete covering rock surface, and timely implementation of rock explosion prevention anchoring measures (including fast anchor rod, hanging net, etc.) Steel arch) and subsequent implementation of a series of system bolting protection measures. The results show that in the areas where the plate fracture and spallation are dominant, the sustained failure occurs in the middle rock burst area due to the inappropriate angle of the anchor rod. The phenomenon of irregular ejection and spalling occurs in the area where the local stress concentration is serious, which usually occurs in the support area of the random bolt or the system bolt. In actual construction, some preventive measures should be adopted, such as setting stress holes, spraying water in the range of top arch and face, and closing excavation rock face in time. The research results can be used as a reference for the construction protection of other underground engineering rock burst areas.
【作者单位】： 中水北方勘测设计研究有限责任公司;
【基金】：国家重点研发计划(2016YFC0401801)
【分类号】：TV554
，
本文编号：2395017
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