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  Stability Analysis of Twin tunnels By A New Limit Strain Criterion

  The Stability of twin tunnels is carried out using the strength reduction method (SRM) based on an ideal elastic-plastic model. However, yield and failure are difficult to differentiate only by stress values in the ideal elastic-plastic model. To address this problem, this paper presents a new limit strain criterion which means the connectivity of zone gets the limit shear or tensile strain. An example is used to compare the new criterion with traditional criteria. Finally, using the grey incidence analysis, the sensitivity of the physical parameters (cohesion, friction angle, Young’s modulus, Poisson’s ratio, the density, tensile strength, mesh size) could influence the factor of safety (FOS) were investigated. The results show that the new criterion could more clearly reveal the developing process of the potential fracture surface, from the onset of damage to the final breakthrough. Moreover, the potential fracture surface indicated by the new criterion is the key zone to be reinforced. The results also show that cohesion, friction angle, and mesh size have the most decisive influence on FOS, but others are subordinate to them.

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