Study on Shear–Softening Constitutive Law of Rock–Concrete Interface

Dong, Wei; Wu, Zhenlin; Zhang, Binsheng; She, Ji

doi:10.1007/s00603-021-02536-6

Cited by 19 publications

(5 citation statements)

References 27 publications

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“…Most of the research on the interfaces of composite materials has focused on the surface roughness and the impact of mechanical parameters on their mechanical properties 14 . These have been investigated through straight shear, tensile, and three-point bending tests 15 – 20 . There are not many types of research on SCCB materials using numerical software.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the mechanical properties and energy evolution of sandstone–concrete combined body

Yuan,

Du,

Shen

2024

Sci Rep

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Studying the mechanical properties of rock–concrete combined body is crucial to ensure the safety and stability of engineering structures. In this paper, laboratory tests and numerical simulations are used to investigate the mechanical properties of the sandstone–concrete combined body. Uniaxial compression tests and an acoustic emission monitoring system are used to analyze the failure characteristics of the sandstone–concrete sample and to validate the accuracy of the numerical model. The mechanical properties of the composite body were further analyzed by integrating energy and damage theories. The results of the sandstone–concrete study suggest that the combined sandstone–concrete body exhibits synergistic deformation and failure when subjected to uniaxial compression. The peak stress and elastic modulus fall between those of sandstone and concrete. The interface's shape causes the stress in the y-direction to transition from tensile stress to compressive stress. Energy is stored before reaching the peak stress and released after reaching the peak stress. The damage curve indicates that the damage increases gradually with the strain, and it results in plastic failure. In the numerical simulation of triaxial compression, the stress and displacement at the interface are evenly distributed. Compared to uniaxial compression, the energy of each component is higher and shows a linear positive correlation with confining pressure. Additionally, the rate of energy dissipation increases with higher confining pressure. The damage variable also increases with the increase in confining pressure, and the plastic failure process is also apparent under triaxial compression.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the mechanical properties and energy evolution of sandstone–concrete combined body

Yuan,

Du,

Shen

2024

Sci Rep

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“…Normal stress is a key external factor affecting the peak shear strength of a structural plane. With the increase of normal stress, the interface will appear scratches or local extrusion failure [24][25][26][27][28][29]. When the normal stress increases to a certain extent, the failure state of the interface will gradually transition from the relative slip along the surface to the large-scale nibbling failure.…”

Section: Introductionmentioning

confidence: 99%

Effects of Normal Stress on Shear Properties and Acoustic Emission Characteristics of Bonded Rock-Concrete Interfaces

Chen,

Yang,

Hou

et al. 2024

Preprint

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Laboratory direct shear and acoustic emission tests are conducted on standard cylinder specimens with varying levels of normal stress. The aim is to gain a better understanding of shear behavior and failure mechanisms of the bonded interface. The results show that increasing of normal stress enhances the brittleness of the specimens. In addition, the test shows that the failure degree of specimens increases with the different normal stresses. The test results show that high amplitude AE peak energy and count generation occur when the specimens reach the peak shear stress. Meanwhile, with the increase of normal stress, the cumulative acoustic emission energy before peak stress increases slightly, but the cumulative acoustic emission count before peak stress decreases. AE b-value proves to be an effective parameter for reflecting the crack size and main crack surface of rock-concrete specimens. The fluctuation value of the AE-b value is influenced by the normal stress.

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“…In engineering design, rock mass is affected by size effect and strain rate, which brings difficulties to its failure prediction (Hashiba et al, 2019;Li et al, 2021). In traditional elastic-plastic mechanics analysis, the curve of stressstrain is usually used to describe the mechanical response of rock deformation and failure process, and thus constitutive equation and strength theory describing rock are established (Haupt, 1991;Nawrocki et al, 1999;Hajiabdolmajid et al, 2002;Liu and Dai, 2018;Dong et al, 2021;Richards et al, 2022;Sun et al, 2023). However, the dispersion of rock strength and the diversity of stress-strain relationship bring difficulties to engineering design analysis and prediction.…”

Section: Introductionmentioning

confidence: 99%

Effects of length-to-diameter ratio and strain rate on strain energy accumulation and dissipation in sandstone

Liu,

Liu

2024

Front. Earth Sci.

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To investigate the influence of the length-to-diameter (L/D) ratio and strain rate on the evolution of strain energy of sandstone under uniaxial compression, experimental tests were conducted using the RMT-150B rock mechanics test system. Specifically, uniaxial compression experiments (UCE), uniaxial loading-unloading experiment(ULUE) and uniaxial cyclic loading-unloading experiments (UCLUE) were performed. The results show that: 1) Based on an investigation of the Kaiser effect in UCLUE, it is postulated that a small degree of loading-unloading has negligible impact on the storage of strain energy in rock masses. The hypothesis regarding the limited influence of loading-unloading on the elastic strain energy storage of rocks is confirmed through a comparative analysis between the elastic strain energy storage in UCLUE and ULUE. 2) By analyzing the ESED and ISED of sandstone under different L/D ratios and strain rates, it is found that it follows the linear energy storage law. The evolution of elastic strain energy is not affected by strain rate. Therefore, the UCLUE at any strain rate can analyze the elastic strain energy of uniaxial compression experiment with the same size at any strain rate, and provide a new method for strain energy analysis at different length-diameter ratios and strain rates. 3) When the stress of sandstone samples of equal size is equal, the smaller the strain rate, the longer the loading experiment of sandstone, the more time the friction development and interconnection of cracks in sandstone are, and the more dissipated strain energy and input strain energy are generated. 4) Smaller L/D ratios are associated with larger ESED and DSED values in sandstone. As the stress intensifies, the ESED and DSED of certain sandstones with larger L/D ratios experience a sharp increase when approaching the failure stress. Under equal stress levels, it is possible for sandstones with larger L/D ratios to exhibit higher ESED and DSED values compared to those with smaller L/D ratios.

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Study on Shear–Softening Constitutive Law of Rock–Concrete Interface

Cited by 19 publications

References 27 publications

Experimental and numerical investigation of the mechanical properties and energy evolution of sandstone–concrete combined body

Experimental and numerical investigation of the mechanical properties and energy evolution of sandstone–concrete combined body

Effects of Normal Stress on Shear Properties and Acoustic Emission Characteristics of Bonded Rock-Concrete Interfaces

Effects of length-to-diameter ratio and strain rate on strain energy accumulation and dissipation in sandstone

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