Analysis of Deformation of Tunnel Surrounding Rock Based on Three Dimensional Finite Element and Improved Grey Theory

Elastoplastic numerical calculation model for three dimensional finite element for tunnel is set up based on PLAXIS 3D and displacement prediction model for tunnel surrounding rock is established based on improved grey prediction theory; with stress distribution, strain pattern and displacement variation pattern in excavation process of tunnel analyzed, relation between parameter and deformation studied, calculation procedure and method for improved grey prediction theory presented so as to obtain settlement and displacement of arch crown in front of tunnel face within certain extent in tunnel excavation process by prediction. Suitong Tunnel is taken as test subject to carry out contrastive analysis relation among three displacement-time curves namely value of simulating calculation, predicted value and measured value and perform cross validation of the above mentioned three values. The validation result shows that the model is able to properly embody deformation pattern of surrounding rock, with prediction precision of displacement value satisfying requirement of specification and having larger scope of application in prediction of surrounding rock stability than that of other methods. The abstract section is mandatory, with a word limit of 200 words. The scope, aims, results and conclusions may be summarized here. Avoid inserting any reference in this section.