Numerical Study and Sensitivity Analysis of Influencing Factors of Double Tunnel Structure and Stability Excavation
The design,excavation,and construction of double tunnels have always been a key topic of research for scholars at home and abroad.There are many factors that affect double tunnels,and each factor may lead to unforeseeable problems in tunnel excavation.Therefore,this article uses indoor rock mechanics experiments,FLAC 3D numerical simulation,and decision theory to study and analyze five common influencing factors on the stability of double tunnels,including arch curvature,double tunnel spacing,tunnel arch curvature,excavation rock cohesion,and tunnel length.The most sensitive factors affecting the excavation of double tunnels are identified.The research results show that as the curvature of the tunnel arch increases,its arch displacement,maximum principal stress,and maximum vertical stress all show a downward trend,while the maximum vertical stress of the central rock column shows an upward trend;The changes in the spacing between double tunnels and the other three influencing factors will have different impacts on the excavation of double tunnels.On this basis,a judgment matrix was constructed using decision theory,and sensitivity analysis was conducted on five factors that affect the excavation of double tunnels.Based on the principle of maximum membership degree,the design of arch curvature was determined as the most sensitive factor affecting the stability of double tunnels.The research results provide scientific basis for the design,excavation,scientific research,and testing of double tunnels in the future.
mechanical testdouble tunnelFLAC 3D numerical simulationinfluence factorsensitivity analysis
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