摘要
隧道下穿自然保护区常因施工不当导致地下水环境失衡或地表沉降,会给自然保护区内的古树带来毁灭性的打击。因此,研究一种隧道下穿自然保护区低扰动施工技术方案迫在眉睫。以老土地隧道下穿翠云廊古柏自然保护区为工程背景,通过信息化施工,在施工过程中采用实时监测,数据分析和反馈,不断修正爆破参数、循环进尺和台阶长度等措施,最终形成一套系统完整的隧道下穿自然保护区综合施工方案。研究结果表明,通过对钻爆参数的不断修正,取得了最优爆破效果;采用以结构自身防水为主,辅以“防水板+土工布+止水带”的防水控制措施取得显著效果,可确保保护区地下水环境的稳定。现场地表沉降监测表明,随着隧道埋深的增加,隧道开挖对地表的扰动越小;隧道埋深越浅,地表沉降历程曲线越陡。隧道埋深32 m时地表沉降2.89 mm,埋深48 m时地表沉降2.48 mm,均满足工程要求。
Improper construction of tunnels underpassing nature reserves leads to imbalance of groundwater environment or surface subsidence,which brings devastation to ancient trees in nature reserves.Therefore,it is urgent to develop a low disturbance construction technology for tunnel underpassing nature reserve.Taking a tunnel under the Cuiyunlang ancient cypress nature reserve as an example,by applying the information construction,the real-time monitoring,data analysis and feedback,blasting parameters,constantly revising cycle footage and step length,a systematic and complete comprehensive construction scheme of the tunnel under the nature reserve was formed.The results show that,the optimal blasting effect is obtained by continuously correcting the drilling and blasting parameters.The waterproof control measures based on the structure itself,supplemented by“waterproof plate+geotextiles+water stopping band”,has achieved remarkable results which can ensure the stability of the groundwater environment in the reserve.The on-site surface subsidence monitoring shows that,with the increase of the buried depth of the tunnel,the disturbance of the tunnel excavation to the surface is smaller;the shallower the buried depth of the tunnel,the steeper the surface settlement curve.The surface settlement is 2.89 mm as the buried depth of the tunnel is 32 m,and the surface settlement is 2.48 mm as the buried depth is 48 m,both meet the engineering requirements.
作者
阳建明
李奉杰
YANG Jianming;LI Fengjie(CRCC Inspection and Certification Laboratory(Chengdu)Co.,Ltd.,Chengdu 610031,China;China Railway 23rd Bureau Group No.3 Engineering Co.,Ltd.,Chengdu 611137,China)
出处
《铁道勘察》
2023年第3期116-122,共7页
Railway Investigation and Surveying
基金
中国中铁股份有限公司科技开发计划重点课题(产品-研-2016-33-2)。
关键词
公路隧道
软弱围岩隧道
浅埋偏压隧道
自然保护区
信息化施工
施工方案
highway tunnel
weak surrounding rock tunnel
shallow embedded bias tunnel
nature reserve
information construction
construction scheme
