论文部分内容阅读
巴西东北部圣佛朗西斯科河上的墨克索托(Moxoto)水电工程是向累西腓地区供电的保罗阿方索瀑布水力发电工程的组成部分,由圣弗郎西斯科中央水电局设计并施工。一号电厂和33.5m高、332m长的堆石坝是在1974年建成的。电厂混凝土使用的骨料取自现场附近的料坑和河床,由于骨料和水泥之间的反应而使混凝土膨胀并开裂,造成水轮机偏斜。1983年最初发现裂缝,以后逐渐恶化,目前开裂延伸经过整个电厂,造成水轮机、轴和发电机偏位,其严重程度可能足以使这座400MW的电站停机。为了制止开裂,工程师们设法减低厂房里的温
The Moxoto Hydroelectric Project on the San Francisco River in northeastern Brazil is part of the Paul Alfonso Waterfall Hydroelectric Power Project that supplies electricity to the region of Recife and is operated by the San Francisco Central Hydropower Agency Design and construction. One power plant and a 33.5m high, 332m long rockfill dam were built in 1974. Aggregates used in concrete for power plants are taken from pits and riverbed near the site and concrete is expanded and cracked due to the reaction between aggregate and cement, causing the turbine to deflect. Cracks were first discovered in 1983 and later deteriorated, and cracking now extends through the entire power plant, causing the turbine, shaft and generator to be deflected to the extent of the severe enough to shut down the 400 MW plant. To stop cracking, engineers managed to reduce the temperature in the plant