Comprehensive Advanced Geological Prediction Method Based on Multi-source Information for Double Shield TBM Construction Tunnel and Its Application

Aiming at the problem of advanced geological prediction of tunnel constructed by double shield TBM,taking the water conveyance tunnel of Lanzhou water source construction engineering as the background,and according to the technical characteristics of less exposed surrounding rock and serious electromagnetic interference of tunnel constructed by double shield TBM,on the basis of analyzing the advantages and disadvantages of different advanced geological prediction methods,the empirical analysis method is adopted to comprehensively select the ground geological analysis,tunneling face observation,tunneling parameters and rock muck analysis,3D seismic method of hammering shock,3D resistivity method and advanced drilling.In the view of the characteristics of different advanced geological prediction methods,a comprehensive advance geological prediction method and its application process suitable for double shield TBM were proposed.The tunnel construction technology by double shield TBM was put forward based on the comprehensive advanced geological prediction results.The research results showed that the comprehensive advanced geological prediction method based on multi-source information takes up less excavation time and achieves the prediction objectives of combining ground and tunnel,geological analysis and geophysical exploration,geophysical exploration and drilling,long-distance and short-term,and qualitative and quantitative analysis.It has good prediction effects on unfavorable geological bodies such as water inrush,fractured zones,and weak surrounding rocks.After taking processing measures based on the comprehensive advanced geological prediction results,the occurrence of tunnel geological disasters or the impact of geological disasters can be effectively avoided,thereby ensuring the rapid and safe construction of TBM.