摘要
针对岩溶隧道排水系统堵塞引发的渗漏病害问题,以桂林岩溶隧道为工程背景,采用FLAC3D建立三维渗流模型,系统分析了不同水头条件下泄水孔孔径、环向位置、数量及纵向间距对衬砌孔隙水压力的影响。研究表明:1)排水系统堵塞导致孔隙水压力分布由“周期性波动型”退化为“全域静水压力型”,显著加剧高水头区结构安全风险;2)泄水孔降压效能存在明确的空间分异规律,边墙底部降压效果最优;3)泄水孔环向布设数量不宜过多,否则降压区域会有明显重叠;4)纵向间距最大不宜超过5 m,最小不宜小于2 m,2 m时降压效果最合理,可满足正常排水需求。基于此提出分级布孔方案:渗漏严重区采用1、3、4号位三孔组合,轻症区采用1号位单孔,该方案兼顾降压效能与施工便利性,为隧道的渗漏水病害处置工作提供依据。
Aiming at the seepage disease problem caused by drainage system blockage in karst tunnels,this study takes a karst tunnel in Guilin as the engineering background,adopts FLAC3D to establish a three-dimensional seepage model,and systematically analyzes the influences of drainage hole diameter,circumferential position,number and longitudinal spacing on lining pore water pressure under different water head conditions.The research indicates that:1)Drainage system blockage causes the pore water pressure distribution to degenerate from a"periodic fluctuation type"to a"uniform static water pressure type",significantly increasing structural safety risks in high water head areas;2)The pressure reduction effect of drainage holes exhibits an obvious spatial differentiation law,and the pressure reduction effect at the bottom of the side wall is the best;3)The circumferential distribution number of drainage holes should not be excessive;otherwise,obvious overlapping of pressure reduction zones will occur;4)The maximum longitudinal spacing should not exceed 5 m,and the minimum should not be less than 2 m.At a spacing of 2 m,the pressure reduction effect is optimal and can meet normal drainage requirements.On this basis,a hierarchical hole layout scheme is proposed:for areas with severe seepage,a three-hole combination at positions 1,3 and 4 is adopted;for areas with mild seepage,a single hole at position 1 is used.This scheme balances pressure reduction efficiency and construction convenience,providing a basis for the treatment of tunnel seepage diseases.
作者
熊飞龙
侯恺乐
蒋雅君
孟信建
喻正兴
XIONG Feilong;HOU Kaile;JIANG Yajun;MENG Xinjian;YU Zhengxing(Guilin Expressway Operation Co.,Ltd.,Guangxi Communications Investment Group,Guilin 541105;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031)
出处
《公路交通技术》
2026年第1期194-204,共11页
Technology of Highway and Transport
基金
广西交通投资集团桂林高速公路运营有限公司2025年度创新创效项目(桂运合养2026-0001号)
2021年度交通运输行业重点科技项目(2021-ZD1-014)
广西重点研发计划项目(2021AB22117)。
关键词
岩溶隧道
泄水孔优化
孔隙水压力
排水系统堵塞
分级布孔
karst tunnel
optimization of drainage hole
pore water pressure
blockage of drainage system
graded hole arrangement
