Theoretical analysis of bearing mechanism and engineering application of pipe roof in a highway tunnel.

Establishing a reasonable and precise theoretical model for pipe roof is crucial for advancing pre-support technology in tunnel construction. By considering the processes of tunnel excavation and support, as well as the reduced constraint reaction force on the pipe roof in unexcavated section due to the disturbance at the tunnel face, this paper establishes a load-structure model for pipe roof based on the Euler-Bernoulli beam theory. The Pasternak elastic foundation model is utilized to ascertain the constraint reaction force exerted by primary support and surrounding soil ahead of the tunnel face on the pipe roof.

Assessment of dynamic responses and impact resistance of corrugated plate-reinforced concrete tunnels under irregular rockfall scenarios.

This article presents a composite tunnel rockfall protection structure (CPRC) employing galvanized corrugated steel plates as the inner formwork for reinforced concrete structures. It addresses the threats posed by frequent rockfall disasters in mountainous regions with complex geology. The research investigates impact damage from various rockfall shapes through numerical simulations and experiments on five representative forms, comparing traditional reinforced concrete structures RC with CPRC.

Seismic response analysis of subway station under obliquely incident SV waves.

This paper aims to investigate the dynamic response characteristics of subway station under earthquakes. To this end, seismic waves are transformed into equivalent nodal loads on viscoelastic artificial boundaries using theories and methods of wave motion. The calculation formulas for equivalent nodal loads of SV waves incident at any angle are established, and ANSYS' APDL program compiles to automatically generate the viscoelastic artificial boundary and input the seismic loads.