en.Wedoany.com Reported - Recently, the Xianxialing No.1 Tunnel on the Qusong section of the Quzhou-Lishui Railway, constructed by China Railway No.2 Engineering Group Co., Ltd. under China Railway Group, has achieved breakthrough. The tunnel has a total length of 8,309.58 meters, features a double-track single-tube design, and has a maximum burial depth of approximately 407 meters. It is located within Suichang County, Lishui City, Zhejiang Province, China.
Before the tunnel breakthrough, construction faced multiple challenges. The Xianxialing No.1 Tunnel traverses the medium-low mountain and hilly region of southwestern Zhejiang, with alternating Grade V and Grade IV surrounding rock. The entire alignment passes through 5 fault zones, 2 lithological contact zones, and 12 joint-intensive zones, requiring the management of adverse geological risks such as dangerous rockfalls, accumulation bodies, high ground stress rock bursts, high ground temperatures, and water inrush. The site is also adjacent to highways, residential buildings, and power transmission lines.
To advance the tunnel breakthrough, the project department adopted a "long tunnel, short driving" strategy, adding one adit and two inclined shafts, dividing the work into three work areas, and opening five working faces for simultaneous parallel operations. For risk pre-control, a comprehensive advanced geological prediction system integrating "geological survey + TSP detection + ground penetrating radar + advanced horizontal drilling" was established. In terms of construction method selection, full-face, bench, and three-bench temporary invert methods were adopted based on different surrounding rock grades, following the principle of "advance pipe support, short advance per round, weak blasting, strong support, quick closure, and frequent monitoring." For dangerous rockfalls and accumulation bodies at the tunnel portal, mechanical excavation combined with precisely controlled blasting was used to strictly control blasting vibration velocity. All construction wastewater was treated to meet standards through a three-stage sedimentation tank before discharge.
The Quzhou-Lishui Railway is a key project in the national medium- and long-term railway network plan and Zhejiang Province's "Eight-Eight Plan" for railway construction. Upon completion, it will end the history of no high-speed rail connection between Songyang and Suichang counties and Lishui City, helping these two counties integrate into the "Zhejiang Province One-Hour Transportation Circle."
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