Advanced Geological Forecasting Techniques for Railway Tunnels in the Complex and Treacherous Mountainous Areas of Southwest China
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 en-gineering 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 se-lections and combinations with a"Four-combination"approach.Practice has shown that:(1)each advanced geologi-cal 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 pri-mary 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 meth-ods,long-distance forecasting with medium and short-distance forecasting,and the integration of different geophysi-cal 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 re-ducing construction risks.
Railway tunnelsAdverse geologyMethod selection and combinationComprehensive advanced geologi-cal forecasting technologies
NETL
NSTL
万方数据
