Stochastic medium predicting model of ground movement tunneling based on non-uniform convergence mode

The two common convergence modes concerning excavated section of tunnel were discussed.A non-uniform convergence mode was introduced to stochastic medium model(SMM),in which the convergence of tunnel bottom is not 0 mm.The solution formulas of ground movement due to tunneling of single and double tunnel with elliptical cross section were deduced and corresponding back analysis method was developed using simulated annealing genetic algorithm.The results show that the predicting model developed in this work can get better predicting precision than non-uniform convergence model(convergence of tunnel bottom is zero) and uniform convergence model,and the model is consistent with the convergence of the tunnel excavation cross-section well.