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제안 방법
- In this study, a mathematical framework based on a homogenisation technique similar to the one used by Lee et al. (2000), but with a different geometrical definition of the reinforced ground is adopted to derive an anisotropic composite material representing the elastoplastic macroscopic behaviour of UARS. A new algorithm for nonlinear stress integration is also proposed.
- The framework developed provides the 9 independent orthotropic elastic constants of the reinforced ground material and the structural matrices that allow deriving the stresses/strains in each constituent from the stresses/strains in the homogenised ground material. The constitutive matrix of the equivalent material and the structural matrices are obtained as functions of the mechanical properties, volume contribution and internal geometrical arrangement of the three constituents of the reinforcement system, i.
대상 데이터
- of the pipes was modified, the stages at which the pipes were installed were also modified. The three cases considered are 6 m long pipes installed every 2 excavation stages, 12 m pipes every 4 stages and 18 m pipes every 6 stages.
- The tunnel considered has a horseshoe-shaped cross section and is excavated in a homogeneous isotropic layer of soil, with a cover at the crown of 10 m. The total length of the tunnel is 48m, excavated in 16 stages of 3 m. Details of the tunnel analysed are shown in Figure 5.
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