Study Of Tunnel Model Construction And Mechanical Characteristics Based On Comprehensive Advance Geological Forecasting Technology

In recent years,China’s rapid economic development,at the same time,the rapid development of the construction industry,tunneling is an essential component.Due to the wide territory of China,the infrastructure requirements for tunnel engineering are getting higher and higher,and the tunnels are developing in the direction of larger and larger scale and higher technical requirements.The construction of tunnels is becoming more and more demanding,and the survey of engineering geological conditions in the early stage should be more and more detailed,and the design and construction of tunnels should be done in strict accordance with the specifications to ensure the safety of tunnels.By integrating advanced geological prediction technologies,analyzing and researching adverse geological structures encountered during tunnel construction,detecting data on fault fracture and karst segments,and utilizing MIDAS GTS NX finite element software for modeling,the impact of adverse geological structures on tunnel construction is studied.Furthermore,this research aims to design reasonable support methods for adverse geological structures and provide theoretical foundations and data support for actual tunnel construction.Firstly,comprehensive theoretical research is carried out on advanced geological prediction technologies.The basic principles,data acquisition,data processing,and result analysis of three methods,namely the TSP method,geological radar method,and transient electromagnetic method,are theoretically studied.After comparative analysis,the advantages and disadvantages of the three methods are identified.By leveraging their complementary strengths,these three methods are integrated and their detection results are mutually validated to provide more accurate geological information and guide safe tunnel construction.Secondly,practical application analysis is conducted on the comprehensive advanced geological prediction technologies.The measurement and detection of two types of adverse geological structures,namely karst caves and fractured fault zones,are mainly selected.The TSP method,geological radar method,and transient electromagnetic method are used to conduct detection and prediction,analyze the data,and obtain the results.The repeated areas measured by the three methods are comprehensively analyzed to determine the location and scale parameters of the karst caves,the location and length of the fractured fault zones,and the degree of fracture.The accuracy of the prediction is verified through actual excavation.Finally,a numerical model of the tunnel is established.The measurement data of fractured fault zones and karst segments obtained by the comprehensive advanced geological prediction technologies are used to model the tunnel using MIDAS GTS NX.Numerical models are separately established for the Baishan Tunnel,karst segments,and fractured fault zones.The Baishan Tunnel numerical model adopts the full-face excavation method,while the karst segments and fractured fault zones numerical models adopt the three-step method.For the three models,support methods for adverse geological structures are designed,displacement analysis and internal force analysis are conducted,and the rationality of the support methods is verified.