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高原山地钻爆法穿越断层破碎带公路隧道施工技术研究

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依托新疆乌尉公路包PPP项目YRTJ-04标段巴什库尔干二号隧道,基于隧址区环境现状和地质条件,对隧道超前预报技术、施工通风技术、施工供氧技术以及穿越断层破碎带钻爆法施工技术进行研究.结果表明,针对新疆高寒高海拔地区隧道施工,考虑海拔高度增加带来的环境因素影响,对隧道通风系统设计进行了优化,明确了隧道施工通风技术参数,满足了现场施工通风需求;针对新疆高海拔低压、缺氧环境特点,确定了临界供氧海拔高度建议值,并依据隧道施工工序进行了劳动强度分级,确定了考虑不同工序劳动强度因素所需的供氧量标准,针对性地提出了巴什库尔干二号隧道施工供氧方案;针对隧道穿越断层破碎带和节理裂隙发育区,采用综合超前地质预报探测、聚能水压光面爆破等关键技术,确保了隧道安全施工及施工工效.
Highway Tunnel Crossing Fractured Fault Zone by Drilling and Blasting Method in Mountain-Plateau Region
This paper presents a case history of the highway tunnel construction of Xinjiang Wuwei Highway Package PPP Pro-ject YRTJ-04 Bid Section Bashkorgan Tunnel 2.Based on the environmental and geological conditions at the tunnel site,several technologies,such as,the tunnel excavation advanced prediction technique,tunnel construction ventilation methods,the oxy-gen supply method during the tunnel excavation as well as the drilling and blasting methods for the crossing over the fractured fault zone,are comprehensively studied.The results show that,in view of the tunnel construction in Xinjiang's cold and high-altitude areas,considering the environmental factors brought by the increase in altitude,the design of the tunnel ventilation system is optimized accordingly.The technical parameters of the tunnel construction ventilation are defined to meet the require-ments of the on-site construction ventilation;According to the characteristics of Xinjiang's high-altitude,low pressure and an-oxic environment,the recommended value of the critical oxygen supply altitude is determined,and the corresponding labor in-tensity classification is carried out according to the tunnel construction procedures.The oxygen supply standard required to con-sider the factors of labor intensity in different procedures is determined,and the oxygen supply scheme for the construction of Bashkorgan Tunnel 2 is proposed;In view of the tunnel crossing fractured fault zone and the well-developed joint fissure area,the key technologies such as the comprehensive advanced geological prediction detection and the concentrated water pressure smooth blasting are adopted to ensure the safe construction and the construction efficiency of the tunnel.

Mountain-Plateau RegionLow Oxygen ContentTunnel EngineeringDrilling and Blasting MethodFractured Fault ZoneHighway Tunnels

任士房、余潭秋、张寰宇、郭志伟

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中交第二航务工程局有限公司,武汉 430040

高原山地 低含氧量 隧道工程 钻爆法 断层破碎带 公路隧道

中交第二航务工程局科研基金

YJZY_ZX_21_021

2024

土工基础
湖北省土木建筑学会,中国科学院武汉岩土力学研究所,武汉市土木建筑学会

土工基础

影响因子:0.238
ISSN:1004-3152
年,卷(期):2024.38(4)