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Wu, Peng
- Non-linear dynamic support optimization method for non-uniform pressure circular tunnel considering the effect of damage
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Authors
Affiliations
1 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, CN
2 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, School of Mechanics and Civil Engineering, China University of Mining & Technology, 221116 Xuzhou, China, CN
1 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, CN
2 State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, School of Mechanics and Civil Engineering, China University of Mining & Technology, 221116 Xuzhou, China, CN
Source
Journal of Mines, Metals and Fuels, Vol 67, No 09 (2019), Pagination: 403-415Abstract
Based on non-linear Hoek-Brown criterion, a new approximate solution of deformation and plastic zone radius of circular tunnel is deduced under non-uniform pressure. In the plastic region, three different, Young’s modulus attenuation models are applied to solve the plastic zone deformation. The results show that the lateral pressure coefficient (LPC), dilatancy coefficient, buried depth and Young’s modulus attenuation exert important effects on the surrounding rock state. Under the influence of LPC, the radius and displacement of plastic zone show non-uniform variation; then, the maximum value of the ground response curve is gradually shifted from the side to the roof. With the burial depth and dilatancy coefficient increase, the surface displacement presents the non-linear increase characteristic. Besides, the influence of Young’s modulus on the plastic zone deformation is not only related to its attenuation model, but also closely related to the surface location and LPC of surrounding rock. Based on the above research, a non-linear dynamic support optimization method for non-uniform pressure circular tunnel is proposed.Keywords
Elastoplastic solution; circular tunnel; nonlinear Hoek-Brown criterion; lateral pressure coefficient; ground response curve
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