Experimental study and failure criterion analysis of dynamic mechanical performance of hydraulic asphalt concrete under combined compression-shear stresses

• Published in: Materials and structures Vol. 57; no. 1
• Main Authors: Tang, Rui, Du, Yubing, Sun, Yanxiao, Hu, Yanli, Tang, Wenbin, Yu, Zhenpeng
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.02.2024; Springer Nature B.V
• Subjects: Adhesive strength; Asphalt; Axial stress; Building Materials; Civil Engineering; Compressive properties; Compressive strength; Criteria; Embankment dams; Engineering; Failure mechanisms; Failure modes; Hydraulic structures; Hydraulic tests; Hydraulics; Machines; Manufacturing; Materials Science; Mechanical properties; Mohr-Coulomb theory; Original Article; Processes; Shear strength; Shear stress; Solid Mechanics; Strain rate; Stress-strain curves; Theoretical and Applied Mechanics; Combined compression-shear stress; Failure criterion; Hydraulic asphalt concrete; Dynamic mechanical performance; Axial compressive stress
• ISSN: 1359-5997; 1871-6873
• DOI: 10.1617/s11527-024-02295-0

Hydraulic asphalt concrete (HAC), extensively employed in impervious structures of embankment dams, typically experiences dynamic compression-shear loads during service with limited studies. By utilizing a servo-hydraulic test device, this study investigated the dynamic compression-shear behaviors of HAC under four strain rates (10 –5 /s, 10 –4 /s, 10 –3 /s and 10 –2 /s) and five axial compressive stresses (0 MPa, 0.25 MPa, 0.5 MPa, 0.75 MPa and 1 MPa) and explored the associated failure modes and stress–strain curves. Corresponding to axial stresses of 0 MPa and 1 MPa, peak shear stresses were determined to be 0.41 MPa and 1.25 MPa at 10 –5 /s, and 0.74 MPa and 1.98 MPa at 10 –2 /s. Peak shear stresses were found to be increased by factors of 3.05 and 2.67 influenced by axial compressive stress. Enhancements of 180% and 158% were observed in peak shear stresses, attributed to the strain rate effect. Based on the Mohr–Coulomb criterion, the compressive-shear strength of HAC comprises the cohesion strength of asphalt matrix and the interfacial adhesion strength between aggregates and asphalt. Moreover, effects of axial stress and strain rate on failure mechanism were illustrated. The failure criteria of HAC under compression-shear stresses were introduced based on the principal stress, octahedral stress and stress invariant. The investigation provides both theoretical and experimental insights for the applications of HAC in hydraulic structures.