Abstract
This chapter focuses on applications in solving real engineering problems, presenting a pseudoshell model that is developed from the extended fictitious crack model (EFCM) for crack analysis of tunnel linings. This model is used to calculate the pressure loads acting on various aging waterway tunnels of hydraulic power plants, based on crack analysis. By virtue of the extended fictitious crack model (EFCM), a different approach has emerged that focuses on the cracking behavior and lining deformation. As an application of the EFCM, a pseudoshell model for crack analysis of the tunnel lining is introduced in this chapter, which enables the crack-mouth-opening displacements (CMODs) of individual cracks to be calculated, corresponding deformations of the lining to be obtained, and pressure loads to be determined by a quasi loosening zone model. Through the case studies, the chapter demonstrates that for tunnels with cracked linings, the pseudoshell model and the quasi loosening zone model can work together to provide an effective means for calculating the ground pressure based on the CMOD.
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