隧道施工中采用"TBM（隧道掘进机）+大机配套"组合工法施工，右洞使用大机配套，左洞将引入世界同类型最 大直径双护盾TBM掘进，直径达13.01米。这是国内高速公路工程领域首次采用大直径双护盾TBM进行主洞施工 的隧道。为防范围岩变形或软弱岩体导致的"卡机"风险，项目团队实施精细化地质勘探，每掘进100米即开展一轮 地质"体检"，通过物探手段进行"CT扫描"，再钻取岩芯实施"病理活检"，全面掌握前方地质状况，保障施工顺利 进行。隧道进口端紧邻成昆铁路复线，为确保铁路运营安全，洞口段前150米范围内将采用非爆破机械开挖。 金西高速公路全长约211.6公里，双向四车道，设计时速80公里，桥隧比75.55%，建设工期6年。该高速公路是 《四川省高速公路网布局规划（2022—2035年）》中20条成都放射线之一，预计2031年建成通车。届时，将结束 凉山州甘洛、越西、喜德3县不通高速的历史，打通成都—西昌—云南新通道，提升四川南向出川能力。 本报讯（四川日报全媒体记者 寇敏芳）1月9日，金西高速（金口河至西昌高速公路）重点控制性工程——越喜隧 道进口端进洞施工，标志着四川在建最长高速公路隧道全面启动建设。 越喜隧道地 ...

Core Viewpoint - The "Ring North Guangxi Project" is a significant water resource allocation initiative in Guangxi, utilizing advanced Tunnel Boring Machines (TBMs) to tackle challenging geological conditions and enhance construction efficiency [2][4][9]. Group 1: Project Overview - The project connects 12 rivers and 15 reservoirs, with a total water conveyance length of 491.10 kilometers, primarily sourcing from the Yujiang River [2]. - The project faces challenges such as small tunnel cross-sections, long excavation distances, hard geological layers (with uniaxial compressive strength reaching 186 MPa), poor ventilation, and high labor intensity [2]. Group 2: TBM Technology and Operation - Seven domestically produced TBMs are being deployed, with three already operational and the remaining four expected to commence by the end of the year [2][6]. - TBMs are considered the "king of engineering machinery" and are crucial for efficient excavation and green construction [4][7]. - The TBM operates using hydraulic drive to rotate a large cutter head, which breaks rock and transports debris through a closed belt system, enhancing safety by minimizing direct contact with the excavation face [4][9]. Group 3: Performance and Efficiency - The "Ring North Guangxi No. 1" TBM can advance over 500 meters per month, significantly outperforming traditional drilling and blasting methods [8]. - The "Ring North Guangxi No. 2" TBM has achieved a cumulative advance of 770 meters, with a maximum daily progress of 36 meters and a utilization rate of 35% [5]. - The introduction of TBMs has greatly improved safety and efficiency in the project, with a lifespan of approximately 10 to 15 kilometers, suitable for long-distance tunnel excavation [8][9]. Group 4: Future Prospects - The full deployment of all seven TBMs is expected to lead to significant advancements in the project, marking an important milestone in Guangxi's water resource development [9].