en.Wedoany.com Reported - The Taiyueshan Tunnel, a key control project of the Lihuo Expressway from Licheng to Huozhou in Shanxi Province, China, recently achieved breakthrough. Constructed with the participation of China Railway No.3 Engineering Group Co., Ltd., this tunnel is currently the longest expressway tunnel under construction in Shanxi Province.
The Taiyueshan Tunnel has a total length of approximately 11.1 kilometers and features a separated twin-bore design. The surrounding rock of the tunnel is predominantly Grade IV and V, requiring passage through 29 fault fracture zones and 2 large-scale folds. The surrounding rock is weak and fractured, presenting prominent geological risks such as mud and water inrush and rock bursts. Constrained by the complex terrain and the environmental protection requirements of the Taiyueshan National Nature Reserve, the project needed to overcome the challenge of ultra-long single-heading excavation from one direction in a single bore, with an excavation distance reaching 5.32 kilometers.
Faced with multiple construction challenges, the project team repeatedly invited tunnel experts for on-site surveys and collective "consultations." Specialized construction plans were formulated for ventilation, drainage, and material transportation in the extra-long tunnel, and a "gallery-type + jet fan multi-stage relay" ventilation system was innovatively applied. Zhao Qingzheng, Chief Engineer of the project for China Railway No.3 Engineering Group, explained that the risk of mud and water inrush in the water-rich fault fracture zones was extremely prominent. Especially during the passage through the S4 water-rich fold fault, the average daily water inflow reached 17,000 cubic meters, equivalent to the water volume of about seven standard swimming pools. During construction, the project abandoned the traditional passive water-stopping and reinforcement model, adopting an active control fault treatment technology. This integrated a complete set of techniques combining "advanced precise geological forecasting + self-advancing medium pipe shed + localized curtain grouting + radial grouting." Simultaneously, relying on information-based control methods, intelligent monitoring, dynamic management, and scientific scheduling were implemented throughout the entire construction process, safely achieving the tunnel breakthrough.
The Lihuo Expressway is a component of the Changzhi-Yan'an Liaison of the Qingdao-Lanzhou National Expressway. It constitutes an important section of the 9th horizontal route of Shanxi Province's "Three Vertical, Twelve Horizontal, and Twelve Ring" expressway network and the 10th horizontal route of the "Four Vertical, Fifteen Horizontal, and Thirty-Three Link" planning.
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