Advanced Geological Forecasting Techniques for Railway Tunnels in the Complex and Treacherous Mountainous Areas of Southwest China
(1. China Railway Eryuan Engineering Group Co., ltd., Chengdu 610031; 2. Chinese Geophysical Society Academician Expert Workstation of China Railway Eryuan Engineering Group Co., ltd., Chengdu 610031; 3. Jiang Liangwen Geological Innovation Studio of China Railway Eryuan Engineering Group Co., ltd., Chengdu 610031)
Abstract：
The railways in the complex and treacherous mountainous areas of Southwest China are characterized by high percentage of tunnels, deep and long tunnels, and complex geological conditions, which highlight prominent engineering geological issues and hazards like collapses, mud outbursts, and gas explosions (outbursts) during tunnel construction. To enhance the specificity, effectiveness, and systemic of advanced geological forecasting for tunnel construction, this paper analyzes and summarizes the applicable conditions, advantages and disadvantages, and the application environments of various conventional advanced geological forecasting methods. It proposes the selection and combination of forecasting methods for different working conditions and types of adverse geological situations,thereby establishing a comprehensive advanced geological forecasting model integrating different methodological selections and combinations with a "Four-combination" approach. Practice has shown that: (1) each advanced geological forecasting method has unique characteristics and a certain application scope; (2) due to the complex engineering geological issues in the Southwest mountainous areas, it is crucial to fully utilize the advantages of each method and adopt a reasonable combination for comprehensive forecasting based on the tunnel construction environment and primary adverse geological features; (3) comprehensive advanced geological forecasting for railway tunnels should adopt a "Four-combination" model, integrating survey data with in-tunnel forecasting, geological and geophysical methods, long-distance forecasting with medium and short-distance forecasting, and the integration of different geophysical methods; (4) the established method selection and combination for advanced geological forecasting and the "Four-combination" model can enhance the specificity, effectiveness, and systemic of detecting adverse geological conditions, with facilitating the resolution of engineering geological issues, effectively guiding construction, and reducing construction risks.
.Advanced Geological Forecasting Techniques for Railway Tunnels in the Complex and Treacherous Mountainous Areas of Southwest China[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(2): 52-59
2024, Vol. 61 