某混凝土拱坝异常变形规律原因初探  

Discussion on Abnormal Deformation of a Concrete Arch Dam

作　　者：胡蕾[1] 马琨[1] 李端有[1] 李波[1] HU Lei, MA Kun, LI Duanyou, LI Bo(Research Center on Water Engineering Safety and Disaster Prevention of Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan 430010, Hubei, China)

机构地区：[1]长江科学院水利部水工程安全与病害防治工程技术研究中心,湖北武汉430010

出　　处：《水力发电》2018年第9期106-109,共4页Water Power

基　　金：国家重点研发计划资助项目(2016YFC0401602);国家自然科学基金资助项目(51579018;51409194);中央级公益性科研院所基本科研业务费项目(长江科学院CKSF2016049/GC;CKSF2017067/GC;CKSF2016015/GC)

摘　　要：根据原型监测资料,某混凝土拱坝在蓄水之后出现异常的倾向上游的变形。为查找原因,同时考虑该拱坝所面临的谷幅收缩问题,拟基于考虑谷幅收缩变形影响的时效因子建立坝体变形监控模型,并与常规的监控模型对比,结果表明:基于考虑谷幅收缩影响的预置时效因子所建立的监控模型更为合理;温度作用对坝体变形的影响较小;水压荷载的综合作用效果是使得坝体倾向下游变形,仅因水位抬升消落变化造成水压变形分量的大小存在波动;在谷幅持续收缩的条件下,拱坝坝体受到了两岸坝肩岩体对其显著的挤压作用,这很可能是坝体倾向上游变形的主要驱动力。Based on the monitoring data of a concrete arch dam, the dam body tends to deform upstream after water storage. In order to explore the reason for this phenomenon and considering the effect of valley shrinkage on deformation of dam body, the aging factor taking valley shrinkage deformation into account is used to build a dam deformation monitoring model. Compared with traditional monitoring model, the results show that,（ a） the new monitoring model is more reasonable;（ b） the temperature has less influence on dam deformation;（ c） the hydraulic load makes the dam body tending to deform downstream, and the magnitude of hydraulic deformation component fluctuates only due to water rise or fall; and（ d） the dam body is significantly extruded by rock mass in dam abutments under continuous valley shrinkage, which is probably the key reason for abnormal upstream deformation of dam body.

关 键 词：拱坝 变形 时效因子 监控模型 谷幅收缩变形 

分 类 号：TV642[水利工程—水利水电工程]