REHABILITATION OF RCC DAMS IN THE DRY AND UNDERWATER
Geomembranes are watertight synthetic materials,factory-manufactured as flexible sheets a few millimetres thick,under computer-controlled procedures that guarantee the engineered properties and quality are constant throughout the production process.The final quality of the installed product is not greatly influenced by weather conditions at the time of installation,which on the contrary applies to other technologies such as concrete,asphalt concrete,or painted or sprayed products.Since the 1950s,geomembrane systems have been used to waterproof all types of hydraulic structures.In dams,their use as upstream water barriers in new construction of embankment dams started in 1959,and in new construction of RCC dams in 1990.Their use to restore watertightness of concrete facings started in 1970 in the dry,and in 1997 underwater.Geomembranes were first used to restore watertightness in RCC dams about twenty years after the advent of this type of dams,in 2002,and have since been used either as repair measures for failing joints or cracks,or to restore watertightness at crucial areas presenting most leakage,or to provide a new water barrier to the entire upstream face.The paper discusses the design and technologies used for each of these scenarios,through typical case histories.
Geomembrane Geocomposite Waterproofing Underwater repair Joints repair
John Cowland Gabriella Vaschetti Alberto Scuero
Carpi Asia Pacific, Hong Kong, China Carpi Tech, Balerna, 6828 Switzerland Carpi Group, Balerna, 6828 Switzerland
国际会议
the 8th International Symposium on Roller Compacted Concrete (RCC) Dams(第八届国际碾压混凝土大坝国际研讨会)
昆明
英文
320-327
2019-11-11（万方平台首次上网日期，不代表论文的发表时间）