富水区域公路改线隧道开挖防排水施工技术研究  

Anti-drainage Construction Technology of Road Diversion Tunnel Excavation in Water-rich Area

作　　者：张迎锋 ZHANG Yingfeng(China Railway 18th Bureau Group Second Engineering Co.,Ltd.,Tangshan 000640,China)

机构地区：[1]中铁十八局集团第二工程有限公司,河北唐山000640

出　　处：《徐州工程学院学报（自然科学版）》2024年第4期41-47,共7页Journal of Xuzhou Institute of Technology(Natural Sciences Edition)

摘　　要：涌水是隧道施工最常见的病害之一,会对隧道安全施工造成较大影响.以两河口水电站县道公路改线隧道为研究对象,先确定地质与涌水情况,处理隧道中的不平整的区域,然后按照适当间距安装盲管,在施工缝和沉降缝安装止水条,经过多次调整后安装防水板、止水带并浇筑混凝土,实现改线隧道开挖防排水治理,最后使用FLAC3D有限元软件构建隧道模型计算施工后盲管间距与使用止水带后的防排水效果.结果显示,盲管间距较小能够缩小隧道剪切塑性区与受拉塑性区面积,不会导致围岩严重变形,盲管间距增大可降低涌水量.综合分析后确定盲管间距为4 m,此时施工性能更优,并且使用止水带能够在高进水压下保持高排水量,实现富水区域公路改线隧道开挖防排水治理.Surge water is one of the most prevalent ailments afflicting tunnel construction,exerting a profound influence on the safe and efficacious construction of tunnels.Consequently,our study was undertaken on the anti-drainage construction technology of highway rerouting tunnels excavated in water-rich areas.In this study,the county highway reroute tunnel in Lianghekou Hydropower Station was selected as the research object.Initially,the geological and water influx situation was determined,the uneven area in the tunnel was addressed,and the blind tube was installed according to the appropriate spacing.Subsequently,the water-sealing strips were placed in the construction joints and settlement joints,and then the waterproofing board and water-sealing strips were installed.Concrete was then poured to achieve the reroute tunnel excavation and anti-drainage,following numerous adjustments.Finally,a tunnel model was constructed with the finite element software FLAC3D.The anti-drainage effect of blind tube spacing and the utilization of water-seals following construction was calculated.The findings indicate that a reduction in blind tube spacing can diminish the extent of the shear plastic and tensile plastic zones within the tunnel,thereby preventing significant deformation of the surrounding rock.Conversely,an increase in blind tube spacing can curtail water inflow.Following a comprehensive assessment,the optimal blind tube spacing was determined to be 4m,as this configuration exhibited superior construction performance.Additionally,the utilization of water-seals has been shown to facilitate effective drainage even under elevated inlet pressure,thereby enabling the effective management of drainage in water-rich highway reroute tunnel excavations.

关 键 词：富水区域 公路改线 隧道开挖 防排水 施工技术 FLAC3D有限元 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]