新疆北疆某供水渠道冻胀融沉变形性状分析  

Analysis on frost-heaving and thawing-settlement behavior of a water supply channel in North Xinjiang

作　　者：周富强 吴艳 戴灿伟 朱明远 孟波 ZHOU Fuqiang;WU Yan;DAI Canwei;ZHU Mingyuan;MENG Bo(Xinjiang Institute of Water Resources and Hydropower Research,Urumqi 830049,Xinjiang,China)

机构地区：[1]新疆水利水电科学研究院

出　　处：《水利水电技术》2019年第12期90-97,共8页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(51479209);国家重点研发计划项目(2016YFB0201000);新疆公益性科研院所基本科研业务经费项目(KY2019089)

摘　　要：针对冻土区季节性输水渠道冻融破坏问题,选取新疆北疆某长距离供水渠道作为研究对象,开展冬季冻胀、春季融沉、通水期及停水后等四种工作状态下阴面渠坡的原位监测试验,研究分析一个完整运行周期内地层岩性为膨胀型沙质泥岩阴面渠坡法向及顺坡向变形性态,并对冻胀变形进行了数值模拟。结果表明:在冻胀期,渠坡顺坡向收缩变形0.3~6.0 mm,坡脚法向隆起变形97.9~115.6 mm;在融沉期,渠坡沿坡面向下滑移约10.0~30.0 mm,顺坡向变形较大的渠段其坡脚法向隆起变形呈增大趋势,最大隆起量为144.0 mm,顺坡向变形较小部位其坡脚法向变形呈沉陷状态,变形量约186.0 mm。通水前后,渠坡顺坡向变形增加约4.0 mm,坡脚法向已隆起部位变形量有所减少,坡脚法向沉陷部位变形增加68.4~80.8 mm。停水后,渠坡法向隆起或沉陷部位的变形不大,已发生衬砌板开裂或错台的部位的顺坡向变形进一步增加约8 mm。研究成果对该渠道工程维修提供了可靠的技术支持,具有一定参考价值。Aiming at the freeze-thawing damage of seasonal water conveyance channel in permafrost region,a long-distance water supply channel in North Xinjiang is taken as the study object,and then an in situ monitoring experiment on the northern slope of the channel under the operation conditions of frost-heaving in winter,thawing-settlement in spring,water delivery period and water conveyance cut-off period is carried out,in which the behaviors of both the normal and the along-slope deformations of the northern slope of the channel with the lithology of expansive sandy mudstone during a full operation cycle are studied,while the frost-heaving deformation is numerically simulated as well.The result shows that the along-slope shrinkage deformation of the channel slope is 0.3 to 6.0 mm with the normal deformation at the slope toe of 97.9 to 115.6 mm during the frost-heaving period and the downward slipping along the surface of the channel slope is about 10.0 to 30.0 mm along with an increasing trend of the normal heaving deformation at the slope toe of the channel section with larger along-slope deformation with the maximum heave of 144.0 mm during the thawing-settlement period,while the normal deformation at the slope toe of the location with less along-slope deformation exhibits a caving-in status with the deformation of about 186.0 mm.Before and after water conveyance,the along-slope deformation of the channel slope is increased by about 4.0 mm along with the decrease of the deformation to some extent of the heaved location at the slope toe and the increase of 68.4 to 80.8 mm of the deformation at the normal caving-in location of the slope toe.After the cut-off of water conveyance,the deformations at both the normal heaving and caving-in locations of the channel slope are not so larger,while the along-slope deformations at both the locations of cracked lining slab or faulting of slab ends are further increased by about 8 mm.The study result provides reliable technical support for the maintenance of that channel with a cer

关 键 词：渠道 冻胀 融沉 法向变形 顺坡向变形 

分 类 号：TV91[水利工程—水利水电工程]