Visco-elastical constitutive model identification of rock mass

It was studied to determine the optimum model from various visco-elastical constitutive models. The rock mass was taken as a complex system and deformation of the rock mass with time gained from field measurement in construction as the output response of the system. Based on the general principle of equivalent mathematical model of complex system, and by using least square method, non-linear optimum technique and fitness test, the paper presented a method to determine the optimum model under specific conditions from a general formula of visco-elastical constitutive models. The obtained model was then used to predict the deformation of rock mass with time and the newly measured field data used to test and modify the model, thus to reach the purpose of theoretical analysis combining closely with guiding actual engineering. An example was given to validate the effectiveness and feasibility of this method.