河底浅埋小净距隧道施工期渗流性状分析  

Analysis of Seepage Characteristics During Construction of Shallow Buried Tunnels with Small Clear Spacing at the Bottom of River

作　　者：李沣展 岳健[1] 安永林[1] 孙超杰 谭仁华 LI Fengzhan;YUE Jian;AN Yonglin;SUN Chaojie;TAN Renhua(School of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201

出　　处：《湖南科技大学学报（自然科学版）》2021年第4期47-54,共8页Journal of Hunan University of Science And Technology：Natural Science Edition

基　　金：湖南省自然科学基金资助项目(2021JJ30248)。

摘　　要：为了弄清河底浅埋小净距隧道矿山法施工段的渗流性状,以长沙市浏阳河隧道为工程背景,考虑工作面时空变化对洞内渗流边界的影响,建立三维数值模型,将施工期的河水位变化情况用8折线函数近似表示并嵌入到模型中进行计算,将计算结果与现场实测结果进行对比,验证了计算模型的可参考性.通过该模型分析施工期的水压力、渗水量、渗流速度、水力梯度的变化性状,并提出相关的工程建议.结果表明:施工期间双洞初衬背后的水压力都小于40 kPa,初衬背后水压力、注浆加固圈外的围岩水力梯度最大值与河水位均呈正相关关系.所得结论对于类似工程具有参考价值.In order to find out the seepage characteristics of the shallow-buried tunnel with small clear distance under the river,with the Liuyang River Tunnel in Changsha as the engineering background,a three-dimensional model was established,which considered the influence of the space-time change of working faces on the seepage boundaries inside the tunnels.The river water level change during the construction period was approximated by the 8-fold line function and embedded in the model.Compared with field test results,reference performances of the calculation model were verified.Based on the model,the variation characteristics of water pressure,seepage flow rate,seepage velocity and hydraulic gradient during construction period were analyzed,and the relevant engineering suggestions were put forward.The results show that the water pressure behind the initial lining is less than 40 kPa during construction;the water pressure behind the initial lining and the maximum rock hydraulic gradient outside the grouting reinforced region’s relationship with the river water level is positively correlated.The conclusions have reference value for the similar projects.

关 键 词：河底浅埋隧道 小净距 渗流性状 河水位变化 矿山法 

分 类 号：U459.5[建筑科学—桥梁与隧道工程]