Study on the fatigue properties and constitutive model of siltstone under the coupled action of dry‒wet cycles and cyclic loads

Huang, Zhen; Zhang, Wei; Zhang, Hai; Zhang, Jiabing; Lü, Xilin

doi:10.1016/j.soildyn.2023.107990

Cited by 4 publications

(1 citation statement)

References 65 publications

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“…Linear regression analysis of the number of wet and dry cycles with uniaxial compressive strength and modulus of elasticity were fitted with 0.937 and 0.962, respectively, indicating that the number of wet and dry cycles has a great influence on the mechanical properties of rocks. Through comparative analysis, it was found that the results of this study are consistent with the results of previous studies 31 – 37 . This may be because there are many microcracks inside the sandstone, and after dry–wet cycles, water enters the cracks, softening the internal particles of the sandstone through water–rock interaction, thereby reducing its mechanical performance indicators.…”

Section: Experimental Methodssupporting

confidence: 90%

Investigating the impact of the quantity of wet and dry cycles on the mechanical characteristics and fracture variations of sandstones

He,

Tang,

Yin

et al. 2024

Sci Rep

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The sandstone is in a state of dry–wet cycle under the repeated action of rainfall, and its mechanical properties are deteriorated to varying degrees, which causes cracks in the sandstone. Therefore, it is of great significance to study the mechanical properties and fracture propagation of sandstone under the action of dry–wet cycles. Currently, there are limited studies using numerical simulation methods to study the fracture extension of rocks under various dry and wet cycling conditions.Therefore, in this paper, the effects of different amounts of dry and wet cycling on the mechanical properties and fracture behavior of sandstone are investigated through uniaxial compression tests and numerical simulations of fracture extension. The findings indicate that the deformation stage of sandstone remains unchanged by the dry–wet cycle. The uniaxial compressive potency and coefficient of restitution gradually diminish as the quantity of cycles rises, while the Poisson's ratio exhibits the opposite trend, and the impact on the mechanical performance of sandstone wanes with cycle increments, and the correlation coefficient surpasses 0.93, signifying a substantial influence of the dry–wet cycle on sandstone's mechanical performances. The discrepancy between the numerical simulation and experimental results is minimal, with a maximum error of only 3.1%, demonstrating the congruence of the simulation and experimental outcomes.The mesoscopic examination of the simulations indicates that the quantity of fractures in the sandstone specimens rises with the escalation of dry–wet cycles, and the steps of analysis linked to crack inception and fracture propagation are accelerated, and the analysis steps from fracture initiation to penetration are also reduced.

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Section: Experimental Methodssupporting

confidence: 90%

Investigating the impact of the quantity of wet and dry cycles on the mechanical characteristics and fracture variations of sandstones

He,

Tang,

Yin

et al. 2024

Sci Rep

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A hypoplastic model considering grain breakage and wetting effect for granular material

Qian,

Xu,

et al. 2024

Computers and Geotechnics

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Study on rock energy evolution and constitutive model under water–rock interaction

Zhang,

Liu,

Huang

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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To explore the degradation in rock mechanical properties due to water–rock interactions and formulate a nonlinear damage constitutive model for the entire stress–strain curve of rocks, experiments involving saturated, dry-wet cycling, and uniaxial compression tests were conducted on granite and siltstone. Based on energy theory, the energy evolution of the rock throughout the testing process was scrutinized. The range of the compaction stage was identified through the analysis of the dissipation energy change curve. A nonlinear damage constitutive model for rocks subjected to water-rock interactions was then devised, drawing on concepts from statistical damage mechanics. The findings indicated a progressive reduction in uniaxial compressive strength and elastic modulus due to water–rock interactions, while the Poisson’s ratio was observed to increase. The energy density curve under these conditions delineated four distinct phases: compaction energy dissipation, linear energy accumulation, pre-peak gradient increase, and post-peak sudden change. The introduction of the unit elastic strain energy density metric underscored the deteriorating effects from an energy standpoint. A nonlinear damage constitutive model, incorporating the compaction stage based on a coupled damage variable, was formulated. The predictions of this model closely matched the empirical data, thereby affirming its validity. This model provides an enhanced depiction of rock deformation and failure mechanisms under the influence of water–rock interactions.

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Study on the fatigue properties and constitutive model of siltstone under the coupled action of dry‒wet cycles and cyclic loads

Cited by 4 publications

References 65 publications

Investigating the impact of the quantity of wet and dry cycles on the mechanical characteristics and fracture variations of sandstones

Investigating the impact of the quantity of wet and dry cycles on the mechanical characteristics and fracture variations of sandstones

A hypoplastic model considering grain breakage and wetting effect for granular material

Study on rock energy evolution and constitutive model under water–rock interaction

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