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京密引水渠从2005年开始渠道低水位运行,平均水深1.5m,低于冬季输水设计水深(1.0～1.2)m,造成部分现浇混凝土板冻胀隆起、断裂、滑落。从2005年至2006年冬季输水结束,渠道阴坡现浇混凝土板破损长度1万6878m,占龙山所管段渠道总长度的45.57%;阳坡现浇混凝土板破损长度4753m,占龙山所管段渠道总长度的12.83%。针对渠道衬砌破坏现状,结合京密引水渠一期技术改造工程设计方案、渠道混凝土衬砌冻胀破坏现状、冻胀观测情况,以及对渠道在冬季低水位运行时,部分混凝土衬砌板冻胀破坏情况从设计、管理运行等方面进行分析,并总结经验教训。
The Jingmi Drainage Channel started operation at low water level in 2005 with an average water depth of 1.5m, which is lower than the design water depth (1.0 ~ 1.2m) in winter, resulting in frost heaving, fracture and slipping off of some cast-in-situ concrete slabs. From 2005 to 2006, the end of winter water supply, channel shade cast-in-situ concrete slab length of 16,80078m, accounting for 45.57% of the total length of the channel section of Longshan; sun-wall cast-in-place concrete slab length of 4753m, The total length of 12.83%. Aiming at the status quo of channel lining damage, combined with the first phase of the Beijing-Shenzhen diversion canal technical transformation project design, channel concrete lining frost heaving damage status, observation of frost heave, as well as channels in winter low water level operation, some concrete slab frost heaving damage From the design, management and other aspects of analysis, and lessons learned.