Study on cracking process and influencing factors of reinforced concrete lining in high-pressure tunnels

Key Points

• The research aims to understand the cracking process and influencing factors of reinforced concrete linings in high-pressure tunnels.
• Developed a coupling analysis method based on pore and fracture flow-stress theory.
• Validated the method with model test results of high-pressure tunnels.
• Performed numerical simulations of the filling and drainage processes in large-diameter tunnels.
• Analyzed factors such as rock permeability, lining thickness, rebar diameter, and crack quantity affecting crack width.
• Developed method accurately reflects model test results and functional characteristics.
• Crack width is positively correlated with filling pressure.
• Crack morphology undergoes complex transition due to increased external water pressure post-cracking.
• Total crack width correlates positively with rock permeability, lining thickness, and number of cracks.

Abstract