3月7日，滇中引水工程大理段首条隧洞——洗窝帚山隧洞顺利贯通。
据介绍，洗窝帚山隧洞全长622米，属于马蹄形大断面隧洞，横穿多条断层，岩体呈散状结构，且局部洞段为典型滇中红层软岩隧洞，围岩稳定性差，施工难度极大。因隧洞段掌子面围岩为泥岩夹砂岩，遇水易膨胀，在开挖过程中，曾多次发生局部垮塌，被迫踩下“急刹车”。项目部经过多次修改施工方案，采用四台阶核心土开挖方法，对掌子面及时进行初喷封闭，保证开挖断面岩层稳定。经过不懈努力，洗窝帚山隧洞于3月5日顺利贯通。成为滇中引水工程大理段首条贯通的隧洞。
滇中引水工程是国务院确定的172项节水供水重大水利工程中的标志性工程，也是目前国内在建的最大单体引水工程。自丽江石鼓镇金沙江段取水，途经丽江市、大理州、楚雄州、昆明市、玉溪市，终点为红河州新坡背，线路全长约664公里。建成后，每年平均引水量达34.03亿立方米，将缓解滇中地区城镇生产生活用水矛盾，改善区内河道和湖泊生态及水环境状况，有力促进云南经济社会可持续发展。
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