大型引调水渠道经山前平原段衬砌失稳机理及对策  

Mechanism and Countermeasures of Instability of Tunnel Lining inFoothill Plain Section of Large-scale Water Diversion Channel

作　　者：刘凯 程曦 崔皓东[2] 魏凯 严敏[2] 王金龙[2] LIU Kai;CHENG Xi;CUI Hao-dong;WEI Kai;YAN Min;WANG Jin-long(China South-to-North Water Diversion Middle Route Co.,Ltd.,Beijing 100038,China;Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China;Changjiang Institute of Survey,Planning,Design and Research,Wuhan 430010,China)

机构地区：[1]中国南水北调集团中线有限公司,北京100038 [2]长江科学院水利部岩土力学与工程重点实验室,武汉430010 [3]长江勘测规划设计研究有限责任公司,武汉430010

出　　处：《长江科学院院报》2024年第10期119-123,共5页Journal of Changjiang River Scientific Research Institute

基　　金：国家重点研发计划项目(2023YFC3209504);中央级公益性科研院所基本科研业务费项目(CKSF2024346/YT)。

摘　　要：高地下水位是危及大型长距离引调水挖方渠道衬砌安全的最主要因素之一,尤其是挖方渠道途经山前平原时,其衬砌安全极易受山前过渡带地下水变化的影响。为了揭示地下水变化对渠道衬砌板稳定影响规律,以南水北调中线某段典型挖方渠段为例,利用地下水监测资料及三维渗流模型分析,结合山前平原地层结构特点,首次阐明输水渠道与山前平原地下水互馈关系,并给出相应对策建议。结果表明:渠道切割山前平原表层透水层形成阻水效应;降雨及山前径流致使山前至渠道之间地带地下水位升高,是导致衬砌板隆起破坏的直接原因。研究成果可为类似山前平原区引调水渠道设计、运维及险情整治提供理论依据和技术支撑。High groundwater level is a most essential factor that threatens the safety of linings in large-scale,long-distance water diversion channels.Particularly when such channels traverse foothill plains,the lining stability is highly influenced by groundwater fluctuations in the foothill transition zone.A typical excavation channel section from the middle route of the South-to-North Water Diversion Project was taken as a case study.By utilizing groundwater monitoring data and a three-dimensional seepage model,we examined how groundwater changes affect the stability of the channel lining in line with the geological characteristics of foothill plain.For the first time,we elucidated the feedback relationship between water supply channel and groundwater in foothill plain and proposed relevant countermeasures.Our findings reveal that the channel intersects the surface permeable layer of foothill plain,creating a water-blocking effect.Rainfall and runoff from the foothill elevate the groundwater level between the foothill and the channel,directly resulting in uplift and damage of lining plate.The results offer theoretical foundation and technical support for designing,operating,and maintaining water diversion channels in similar foothill plain regions and for managing associated risks.

关 键 词：引调水渠道 山前平原 高地下水 衬砌失稳 渗流分析 

分 类 号：TV672[水利工程—水利水电工程] TV223.4