羊曲水电站导流洞埋深较浅,所处位置地质条件差,隧洞断面大,开挖易塌方. 在分析导流洞施工难点的基础上,结合类似工程塌方处理经验,主要采用"双排超前管棚"、"先拱后墙跟进衬砌"等施工技术,并通过优化支护参数和施工程序,顺利完成了该工程隧洞的塌方处理,且满足了导流洞过水的节点工期要求. 相关技术措施可为类似工程塌方处理提供参考和借鉴.%The buried depth of the diversion tunnel of Yangqu Hydropower Station is shallow, where the geological conditions are poor. The tunnel section is large, an prone to collapse in excavation. On the basis of analyzing the construction difficulties, the construction technology of double-row leading pipe-shed and first lining arch then wall were used and the supporting pa-rameters and construction procedures were optimized by combining with the similar engineering collapse treatment experience, so that the treatment of tunnel collapse in Yangqu Hydropower Station is completed smoothly and the flow-passing of the diversion tunnel is on schedule. The technical measures can provide reference for collapse treatment of similar projects.
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