The Effect of Initial Creep Damage on Unloading Failure Properties of Sandstone from Macro-mesoscopic Perspective

Wang, Yu; Qiao, Qingning; Li, Jianlin

doi:10.3311/ppci.14535

Cited by 4 publications

(4 citation statements)

References 24 publications

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“…To further quantitatively analyze the pore features of UF surface after undergoing wet-dry cycles, the 2D average porosity variation curves of all tested samples under different times magnification are obtained by the method of [37], Fig. 19.…”

Section: Sem Image Analysis and Porosity Calculationmentioning

confidence: 99%

Effect of wet-dry cycles on disintegration characteristics of clay-bearing sandstone with UF cracks

Wang¹,

Qiao²,

Li³

2020

Period. Polytech. Civil Eng.

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UF cracks in rock masses commonly occur due to the unloading effect, which constantly happens after the variation of in-situ stress field or rock excavation. When undergoing periodic water fluctuation, rock mass with UF cracks is vulnerable to deterioration or even disintegration, especially for clay-bearing sandstone. To study the effect of changes in moisture on rock samples with UF cracks, clay-bearing sandstone from the Triassic Badong group in the Three Gorges Reservoir Area were chosen and investigated. The rock samples with UF cracks are obtained by conducting triaxial unloading confining pressure experiment. The effect of wet-dry cycles on the morphology properties and microstructure of the UF surface was investigated. The characteristics of particle-size uniformity from the sieve test were obtained by the calculation of RMS of particle contents. The test results show that UF cracks widen significantly and the disintegrated mass increases rapidly in the first three wet-dry cycles, while the fractal dimension of UF surface decreases sharply, but afterwards the disintegrated mass changes gently and the UF surface tends to be flat and smooth. Then, the RMS calculation of particle contents quantitatively evaluate the clay-bearing sandstone’s disintegration properties, which indicate the particle uniformity plays a key role on its disintegration mechanism. During wet-dry cycles, the tested samples tend to disintegrate more rapidly and entirely with the decrease of particle uniformity.

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Section: Sem Image Analysis and Porosity Calculationmentioning

confidence: 99%

Effect of wet-dry cycles on disintegration characteristics of clay-bearing sandstone with UF cracks

Wang¹,

Qiao²,

Li³

2020

Period. Polytech. Civil Eng.

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“…Triaxial unloading test studies of rocks under different unloading paths show that unloading will cause strong volume failure of the rock along the unloading direction, and rock under unloading are more easily damaged than under loading 5 – 7 . In addition, triaxial unloading experiments under different initial damages, unloading rates and stress levels were carried out, and the influence of various factors on the rock were analyzed 8 – 10 . Various rock strength and failure criteria can reflect the strength characteristics of unloading rocks based on unloading tests, among which are the Mohr–Coulomb criterion 11 , Hoek–Brown criterion 12 and Mogi–Coulomb criterion 13 that are often used.…”

Section: Introductionmentioning

confidence: 99%

Study on mechanical properties and fracture surface characteristics of argillaceous sandstone under different stress paths

Huang

Wang

et al. 2022

Sci Rep

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To study the differences in mechanical properties and failure characteristics of underground chambers surrounding rock under different stress conditions, triaxial loading and unloading tests were carried out on argillaceous sandstone. The three-dimensional topography parameters of the fracture surface were obtained by using high-precision three-dimensional topography scanning technology, including six height characteristic parameters and two texture parameters. Compared with the triaxial loading test, the strength, peak strain and residual strength of argillaceous sandstone with the same confining pressure under unloading conditions all decrease, and the stress–strain curve changes from ductility to brittleness. The Mogi–Coulomb strength criterion can better describe the strength properties of argillaceous sandstones than the Mohr–Coulomb and Drucker–Prager strength criteria. Under the unloading condition, the cohesion c decreased by 30.87% and the internal friction angle φ increased by 30.87% compared with the loading condition. The tensile cracks perpendicular to the unloading direction is formed during unloading, resulting in large roughness, dispersion and fluctuation of fracture surface.

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“…is phenomenon has an adverse effect on the mechanical properties of the rock mass [1][2][3][4][5]. According to statistics, more than 1,190 landslides have occurred in the ree Gorges reservoir area [6].…”

Section: Introductionmentioning

confidence: 99%

Study on the Creep Constitutive Model of a Sandstone Rock under the Water-Rock Interaction

Luo

Zhu

et al. 2021

Advances in Civil Engineering

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With the continuous construction of large-scale geotechnical engineering, more and more attention has been paid to the long-term stability of rock mass engineering, especially the problem of rock creep under the influence of water. Combined with the author’s previous research on the triaxial creep characteristics of sandstone under water-rock interaction, a nonlinear creep constitutive model was established to capture the degradation behavior of a sandstone rock due to cyclic wetting and drying of the reservoir water. Due to the limitations of the visco-elastoplastic model, a thorough modification was done to account the effect of the water-rock interaction on the mechanical degradation of the sandstone rock. Finally, the predicted results were proved to be in a good agreement with the experimental results. Moreover, the strong correlations between the predicted results and the experimental results show the effectiveness of the modified model to scrutinize the nonlinear creep behavior of sandstone rock. Relevant research results have important theoretical significance for the accurate prediction and effective control of the long-term stability of rock mass engineering under the influence of water-rock interaction.

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The Effect of Initial Creep Damage on Unloading Failure Properties of Sandstone from Macro-mesoscopic Perspective

Cited by 4 publications

References 24 publications

Effect of wet-dry cycles on disintegration characteristics of clay-bearing sandstone with UF cracks

Effect of wet-dry cycles on disintegration characteristics of clay-bearing sandstone with UF cracks

Study on mechanical properties and fracture surface characteristics of argillaceous sandstone under different stress paths

Study on the Creep Constitutive Model of a Sandstone Rock under the Water-Rock Interaction

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