滇中引水一期工程楚雄段隧洞全线贯通|亚洲 欧美 变态 另类 综合
中新网楚雄10月29日电 (孙丽 向津磊)28日，随着中铁十六局承建的凤屯隧洞最后一段岩体成功爆破，滇中引水一期工程楚雄段实现全线贯通，为工程全线通水筑牢基础。
滇中引水工程为云南省有史以来投资最大的民生工程，横跨金沙江、澜沧江、红河三大流域，输水干线总长664公里，惠及昆明、楚雄等6州(市)1112万人。
楚雄段全长153.53公里，隧洞占比达91.6%，工程穿越“滇中红层”、横断山脉余脉等复杂地质区，地层岩性以软岩为主，洞室围岩稳定性差，最大埋深695米。楚雄段工程建设面临深埋隧洞施工难、地下水处理难、破碎断层穿越难、软岩大变形应对难等四大世界级施工难题。
此次贯通的凤屯隧洞位于牟定县境内，全长9.87公里，其出口段为单工作面掘进模式，单面掘进长达5.94公里，是楚雄段关键线路，隧洞穿越“滇中红层”软岩区，以Ⅳ、Ⅴ类围岩为主，最大埋深达630米，软岩大变形问题突出，极端涌水量高达每天3万立方米，施工条件极为严峻。
“施工过程中，我们多次遭遇严重的塌方、突涌水等地质灾害，不仅严重制约施工进度，更给工程安全带来巨大挑战。”中铁十六局滇中引水楚雄段施工3标项目部负责人王爱东说道。面对复杂的地质条件，参建团队构建“超前预报—动态调整—精准支护”技术体系，通过TSP探测、瞬变电磁等技术手段构建地质“透视网”，实时掌握围岩动态。创新采用“微台阶+锁脚大管棚”工艺后，软岩大变形量降低80%，初支一次合格率达100%；同时，遵循“以排为主、堵排结合”方针，成功治理了洞内地质灾害。
据了解，滇中引水工程由水源工程和输水工程两部分组成，水源工程位于丽江市玉龙县石鼓镇。输水工程自丽江石鼓镇望城坡开始，途经丽江市、大理州、楚雄州、昆明市、玉溪市，终点为红河州个旧市大屯镇新坡背。工程建成后，将有效缓解楚雄、昆明等区域水资源矛盾，改善高原湖泊生态，成为云南高质量发展的“水动脉”。(完)
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