Freeze-Thaw Damage Degradation Characteristics and Fracture Mechanism of Rock-Concrete Interface
LU Jianyou
WU Chengsen
CHANG Xu
CHEN Denghong
Abstract：A discrete element numerical model was established based on the volume expansion theory,and the damage and failure process of the rock-concrete interface under the coupled action of freeze-thaw cycles and dynamic three-point bending load was systematically simulated.The results show that the crack propagation of the rock-concrete interface undergoes three stages:slow growth,rapid growth,and unstable failure;the fracture toughness has a significant dependence on the loading rate.At low loading rates(v=0.5-1.0 m/s),the fracture toughness exhibits the characteristic of"slight increase-sharp decrease".When the loading rate increases to 1.3-1.7 m/s,the fracture toughness exhibits a"sharp increase-sharp decrease"trend.The growth rate of the stress intensity factor shows a general downward trend with increasing number of freeze-thaw cycles.
Keywords：freeze-thaw cyclerock-concrete interfacePFC2D softwarethree-point bendingfracture toughness
Publication Date：2026-01-31
Online Publishing Date：2026-03-17(First online date of this platform, not the publication date of the document)
Pages：10( 67-76 )