Influence of Soft Rock Factor and Time Dependence in Deep Tunnel

Abstract:

With the development of highway tunnel engineering, the stability of the tunnel become the chief problem in designing and constructing. Tunnel surrounding rock under high stress based on the actual engineering background, model test process of excavation in soft rock tunnels under the distribution factors was finished in triaxial test mechine. Through sensor test, the whole process of tunnel became instable was reflected, and the different conditions of the change rule of surrounding rock stress was budgeted and analysed. the numerical simulation method was used to study dependency of deep tunnel with soft rock in it and the lining deformation time. in which nonlinear Drucker-Prager plastic coupling and creep constitutive model were used to describe the nonlinear viscous-elastic-plastic properties of high stress soft rock. The characteristies of tunnel lining deformation and internal force variation were studied with the above model. Soft rock thickness, soft rock tunnel location effect on inner force and deformation of the structure were discussed. The results have reference value in evaluation of long-term stability of deep tunnel.

• Periodical: Applied Mechanics and Materials (Volumes 353-356)
• Pages: 1625-1629
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.353-356.1625
• Online since: August 2013
• Authors: Yan Chen*, Xiao Chun Zhang, Hua Rong Wang, Nan Tong Zhang
• Keywords: Similar Experiment, Soft Rock, Time Dependence, Tunneling Engineering

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DOI: 10.1016/s0148-9062(98)00171-5

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