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Identifying fatigue damage of mudded intercalations based on dynamic triaxial test
Abstract Fatigue damage caused by cyclic dynamic loading may deteriorate strength parameters of mudded intercalations. This research work aimed at defining a new fatigue damage variable expression and revealing the fatigue damage evolution laws of mudded intercalations by conducting dynamic triaxial tests. The specimens were collected in China and remodeled. The test results indicated that the dynamic stress-strain curves of mudded intercalations represented obvious strain-hardening characteristics. The new fatigue damage variable expression was formulated according to Ramberg-Osgood strain-hardening law applied to a three-direction stress state. The fatigue damage evolution laws of mudded intercalations could be described by a low-cycle damage evolution model and could be aligned with dynamic strength failure laws. The fatigue damage deepened with an increase in the cyclic ratio. The fatigue damage evolution rate was correlated with the clay mineral composition and percent of clay size particles (strongly), water content (moderately positive), confining pressure (weakly positive), and the cyclic ratio (initially, negative and then, positive).
Highlights The first study to systematically investigate the fatigue damage of mudded intercalations. Formulating a new fatigue damage variable expression applicable to strain-hardening soil. Experimentally revealing the impact factors of the fatigue damage of mudded intercalations along with their impacts. A low-cycle fatigue damage model could be used to describe the dynamic damage evolution laws of mudded intercalations.
Identifying fatigue damage of mudded intercalations based on dynamic triaxial test
Abstract Fatigue damage caused by cyclic dynamic loading may deteriorate strength parameters of mudded intercalations. This research work aimed at defining a new fatigue damage variable expression and revealing the fatigue damage evolution laws of mudded intercalations by conducting dynamic triaxial tests. The specimens were collected in China and remodeled. The test results indicated that the dynamic stress-strain curves of mudded intercalations represented obvious strain-hardening characteristics. The new fatigue damage variable expression was formulated according to Ramberg-Osgood strain-hardening law applied to a three-direction stress state. The fatigue damage evolution laws of mudded intercalations could be described by a low-cycle damage evolution model and could be aligned with dynamic strength failure laws. The fatigue damage deepened with an increase in the cyclic ratio. The fatigue damage evolution rate was correlated with the clay mineral composition and percent of clay size particles (strongly), water content (moderately positive), confining pressure (weakly positive), and the cyclic ratio (initially, negative and then, positive).
Highlights The first study to systematically investigate the fatigue damage of mudded intercalations. Formulating a new fatigue damage variable expression applicable to strain-hardening soil. Experimentally revealing the impact factors of the fatigue damage of mudded intercalations along with their impacts. A low-cycle fatigue damage model could be used to describe the dynamic damage evolution laws of mudded intercalations.
Identifying fatigue damage of mudded intercalations based on dynamic triaxial test
Yan, Changbin (author) / Wang, Hejian (author) / Xu, Xiao (author) / Zhang, Yanchang (author)
Engineering Geology ; 280
2020-11-24
Article (Journal)
Electronic Resource
English
Geotechnical dynamics , Dynamic triaxial test , Fatigue damage , Strain-hardening , Mudded intercalations , <italic>D</italic> <inf>d</inf> , <italic>N</italic> , Cycle numbers , <italic>N</italic> <inf><italic>f</italic></inf> , Cyclic failure numbers , <italic>h</italic> , Strain-hardening parameter , Δ<italic>σ</italic> <inf>d</inf> , Dynamic stress range, kPa , <italic>σ</italic> <inf>d</inf> , Dynamic loading, kPa , <math xmlns="http://www.w3.org/1998/Math/MathML"><msub><mover><mi>σ</mi> <mo>˜</mo></mover> <mi>d</mi></msub></math> , Effective dynamic stress, kPa , <italic>ε</italic> <inf>p</inf> , Cumulative plastic strains , <italic>ε</italic> <inf>0</inf> , Plastic strains at the beginning of the cycle , <italic>ε</italic> <inf>d<italic>f</italic></inf> , Plastic strains at the end of the cycle , <italic>σ</italic> <inf>s</inf> , Static pressure, kPa , <italic>τ</italic> <inf>d<italic>f</italic></inf> , dynamic strength, kPa , <italic>C</italic> <inf>d</inf> , dynamic cohesion, kPa , <italic>φ</italic> <inf>d</inf> , dynamic friction angle, °
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