Experimental Study of Interface Shearing between Calcareous Sand and Steel Plate Considering Surface Roughness and Particle Size

Kou, Hai‐lei; Diao, Wen-Zhou; Zhang, Wang-chun; Zheng, Jingbin; Ni, Pengpeng; Jang, Bo-An; Wu, Chong

doi:10.1016/j.apor.2020.102490

Cited by 37 publications

(11 citation statements)

References 38 publications

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“…Two series of tests were conducted in this study, one was the monotonic shear test of sand-steel interface, which considered the influence of factors such as normal stress, interface roughness, and relative density of sand on the test. In the shear test studies of sand conducted by Punetha [30], Wang [31] and Kou [32] and many other researchers, the shear rate was 0.2-1.2 mm/min. In order to ensure the stability and reliability of the test data, this test controlled the shear rate at 0.3 mm/min and stopped the test when the fixed shearing displacement had reached 10 mm.…”

Section: Types Of Interface Shear Monotonic Shear Cyclic Shearmentioning

confidence: 97%

Research on Shear Behavior of Sand–Structure Interface Based on Monotonic and Cyclic Tests

2021

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In order to study the shear behavior of the interface between sand and structure, a series of shear tests were carried out using an HJ-1 ring shear apparatus (Nanjing, China). First, through the monotonic shear tests, the loose sand and dense sand were sheared at the steel interface with different roughnesses. The results showed that when the interface was relatively smooth, the shear stress–shear displacement curves of loose sand and dense sand both exhibit strain hardening characteristics. When the interface was rough, the dense sand showed strain softening. The initial shear stiffness of the sand–steel interface increased with the increase in normal stress, interface roughness, or sand relative density. Then, considering the influence of initial shear stress, through the cyclic shear test, this work analyzed the shape of the loading and unloading curves and the development law of cumulative normal deformation, and discussed the change of loading and unloading shear stiffness under different stress level amplitudes and the residual deformation generated during the cycle. The research results showed that loose sand and dense sand generally shrunk in volume during the cycle. The initial loading process was similar to the case of static loading. In the later dynamic loading process, the shear shrinkage per cycle was relatively small and continued to develop. Additionally, it was found that the unloading stiffness of the sand–steel interface is always greater than the initial loading stiffness. As the number of cycles increases, the loading stiffness increases, and it may eventually approach the unloading stiffness.

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Section: Types Of Interface Shear Monotonic Shear Cyclic Shearmentioning

confidence: 97%

Research on Shear Behavior of Sand–Structure Interface Based on Monotonic and Cyclic Tests

2021

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“…19,20 Numerous factors influence the properties of the sand-concrete interface, such as stress level, particle shape, particle size, initial relative density, and temperature. 21,22 Surface roughness serves as a crucial indicator and is typically defined by parameters such as peakvalley distance (𝑅), average roughness (𝑅 a ), or standardized roughness (𝑅 n = 𝑅 max ∕𝑑 50 ). 23,24 However, these parameters are primarily applied to regular surfaces while engineering practice often deals with surfaces that possess irregular shapes.…”

Section: Introductionmentioning

confidence: 99%

Analyzing cyclic shear behavior at the sand–rough concrete interface: An experimental and DEM study across varying displacement amplitudes

Zhang,

Liu,

Zeng

et al. 2024

Num Anal Meth Geomechanics

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Pile foundations frequently endure dynamic loads, necessitating an in‐depth examination of the cyclic shear properties at the pile–soil interface. This study involved a series of cyclic direct shear (CDS) tests conducted on sand and concrete with irregular surface, utilizing varying displacement amplitudes (1, 3, 6, and 10 mm) and joint roughness coefficients (0.4, 5.8, 9.5, 12.8, and 16.7). Discrete Element Method (DEM) models, informed by experimental data, facilitated mesoscopic mechanical response analyses. Findings indicate that the sand–concrete interface undergoes softening, with hysteresis loops' morphology dependent largely on displacement amplitude. A maximum ultimate shear stress corresponds to a specific critical surface roughness, while the initial tangent modulus escalates with increased concrete roughness. Volume variations of the specimen inversely correlate with displacement amplitude and directly with surface roughness. As displacement amplitude expands, there is a reduction in the maximum shear stiffness and an elevation in the maximum damping ratio. Empirical formulas for the surface roughness and normalized shear stiffness were proposed. Larger displacement amplitudes result in more substantial shear bands and heightened energy dissipation, yet the incremental energy ratio remains largely unaffected. Predominant energy dissipation mechanisms include both slip and rolling slip, with the former surpassing the latter in energy dissipation capacity. The anisotropy directions of contact normal, normal contact forces, and tangential contact forces consistently fluctuate with shear direction alterations.

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“…Many studies have used test methods (direct and ring shear tests) and numerical simulation (e.g., discrete element method (DEM)) to investigate the influence of factors such as roughness, material hardness, relative compactness, particle size distribution, roundness, moisture content, and normal stress on the mechanical properties of the soilstructure interface [6][7][8][9][10][11]. Interface roughness is a critical factor affecting interface shear strength and has been extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Mechanical Properties of the Sand–Concrete Pile Interface Considering Roughness and Relative Density

Chen

Leng

et al. 2022

Materials

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The aim of this study was to investigate the effect of roughness and relative density on the mechanical properties of sand-concrete pile interface. A series of direct shear tests were carried out on the interface using a large-scale direct shear apparatus with various relative densities of sand (73%, 47%, and 23%) and concrete blocks with four roughness values (I = 0, 10, 20, and 30 mm). Various mechanical properties (such as shear stress, volume change, peak shear strength, secant friction angle, and normalized friction coefficient) from the interface tests were compared with trends obtained from the pure sand direct shear test. For the smooth interface, the shear stress–horizontal displacement curves of the dense sand specimen exhibited a slight softening response, which became more apparent as the roughness increased. The curves of the loose sand specimen demonstrated a hardening response. The volumetric response was influenced by the combination of normal stress, relative density, and roughness. The peak shear strength demonstrated a nonlinear increasing trend as the normal stress increased. With an increase in the normal stress, the secant friction angle and peak friction coefficient decreased as exponential and power functions, respectively. Additionally, a critical roughness value Icr resulted from the tests, which halted the upward trend of the peak friction coefficient and normalized the secant friction angle when I exceeded Icr.

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Experimental Study of Interface Shearing between Calcareous Sand and Steel Plate Considering Surface Roughness and Particle Size

Cited by 37 publications

References 38 publications

Research on Shear Behavior of Sand–Structure Interface Based on Monotonic and Cyclic Tests

Research on Shear Behavior of Sand–Structure Interface Based on Monotonic and Cyclic Tests

Analyzing cyclic shear behavior at the sand–rough concrete interface: An experimental and DEM study across varying displacement amplitudes

Experimental Investigation of the Mechanical Properties of the Sand–Concrete Pile Interface Considering Roughness and Relative Density

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