Modeling of Tunnel Concrete Lining under Fire and Explosion Damage

Abstract

This paper presents studies that focus on fire and explosion-induced damage of tunnel structures by employing the Discrete Element Method (DEM). By assuming a two-dimensional aggregate distribution and reconstructing the digital representation of the experimental concrete blocks, a numerical model of the tunnel lining concrete was established in the PFC2D program. The temperature distribution and the shock wave pressure at the surface of the tunnel lining were obtained by using Fluent and LS-Dyna separately; the final damage simulation of concrete section under different conditions was carried out in PFC2D. The results showed that PFC2D cooperatively provided more accurate and effective modeling and visualization of impact damage of concrete blocks. The visualizations of damage indicated the degree of damage more clearly and more intuitively. These findings also provide a potential method for further study of the damage assessment for entire tunnel lining structures.

Early age dynamic mechanical properties of basalt fiber reinforced early strength concrete

“…When the supporting structure is very close to the source of explosion, the blasting excavation may cause impact damage to nearby structural concrete that have not reached the standard curing age, which affects the long‐term strength of the supporting structure 11–14 . Therefore, the influence of early impact on concrete has attracted much attention, and a large number of scholars have carried out experimental studies on the influence of vibration disturbance on concrete with early age 15–18 …”

“…[11][12][13][14] Therefore, the influence of early impact on concrete has attracted much attention, and a large number of scholars have carried out experimental studies on the influence of vibration disturbance on concrete with early age. [15][16][17][18] In order to reflect the engineering practice, people have begun to study the dynamic response of concrete with early age under high strain rate by the split Hopkinson pressure bar (SHPB). [19][20][21][22][23] Wang et al studied the relationship between strength, peak strain, absorption energy of concrete with early age and strain rate.…”