Ground settlement induced by tunnel excavation is an important problem faced by tunnel construction.Taking the construction of Baijiashan Tunnel of G106 Ezhou Bishi to Huangshi Tieshan Reconstruction engineering(Ezhou section)as the object,the law of land subsidence deformation induced by cross diaphragm(CRD)construction was studied through on-site finite element numerical simulation and actual monitoring methods.The results show that the surface deformation above the central axis is the largest in the six-step excavation of highway tunnel,and the key part affecting the surface deformation is the right step excavation.The results of simulation calculation are in good a-greement with the field monitoring values,which indicates that the conclusion can be used for reference in similar pro-jects.
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