Dynamic response analysis of concrete lining structure in high pressure diversion tunnel under seismic load

• Main Authors: Jian Deng, Ming Xiao
• Format: Article
• Language: English
• Published: JVE International 2016-03-01
• Series: Journal of Vibroengineering
• Subjects: diversion tunnel; dynamic damage and cracking; fluid-structure coupling; explicit finite element; permeability coefficient; inner water exosmosis
• Online Access: https://www.jvejournals.com/article/16289

Dynamic response of concrete lining structure in high pressure diversion tunnel under seismic load is of great importance for engineering design and safety assessment. In light of the basic idea of static damage constitutive in strain space, a dynamic damage and cracking model of concrete suitable for programming is established. Based on the explicit finite element method for analyzing the dynamic response of single-phase solid and fluid medium, combining with the boundary conditions at coupling interface, a dynamic explicit finite element solving format considering the coupling interaction of lining and inner water is presented. This method can directly integrate, solve without simultaneous equations, and greatly simplify the calculation process. Moreover, it can be easily used to analyze wave propagation problems with a variety of mediums. According to the damage evolution properties of concrete lining under seismic load, a calculation method of permeability coefficient considering the effect of damage and cracking is put forward, and the inner water exosmosis process with lining cracks is analyzed. The calculation results of engineering example can reasonably reflect the seismic response characteristics of concrete lining structure in high pressure diversion tunnel, and an effective analysis method is provided for the aseismic design of hydraulic tunnel.