Abstract
During the tunnel excavation construction, the internal stress of surrounding rock surface will release to zero immediately, and the displacement of the surrounding rock surface increases slowly because of the delayed strain of the rock material. Set the stress of the surface is easier then set the strain of the surface while numerical simulation of excavation in FLAC3D and other software. Based on the rock mechanics and excavation process, combined with on-site monitoring of the displacement data, use the FLAC3D software to establish study examples, use Genetic Algorithm optimize the weight and bias of the neural network, analyze the release rate of stress of surrounding rock under a reasonable construction time. It can provide the reference data for the tunnel design, construction and the numerical simulation analysis during construction under the similar conditions.
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