Investigation of the effects of wetting–drying and freezing–thawing cycles on some physical and mechanical properties of selected ignimbrites

Özbek, Ahmet

doi:10.1007/s10064-013-0519-y

Cited by 150 publications

(51 citation statements)

References 14 publications

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“…Cyclic wetting‐drying is a well‐known yet poorly understood weathering process. Many studies have been conducted on the effect of wetting‐drying cycles on the physical and mechanical properties of rocks, concerning water adsorption, acoustic wave velocity, elastic modulus, tensile strength, and static uniaxial or triaxial compressive strength . The deterioration process of rock mechanical properties under cyclic wetting‐drying could also be induced by original defects …”

Section: Introductionmentioning

confidence: 99%

Influence of cyclic wetting‐drying on the mechanical strength characteristics of coal samples: A laboratory‐scale study

Chen

Jiang

Wang³

et al. 2019

Energy Science & Engineering

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Water‐coal interactions have gained much recent attention, although few studies focus on the strength of coal under wetting‐drying cycles. This study investigates changes in the microstructure and mechanical strength of coal that are induced by water‐coal interactions, at the macroscale and microscale. Fourteen specimens after continuous wetting and fourteen specimens after wetting‐drying cycles were tested, indicating that peak stress and elastic modulus decrease with increasing continuous wetting time and number of wetting‐drying cycles, while peak strain increases. We analyzed changes in the coal microstructure using a scanning electron microscope (SEM) and the Image Pro Plus 6.0 (IPP 6.0) software. The regression model for cyclic wetting‐drying reveals that porosity and pore circularity are the main correlation indicators associated with uniaxial compressive strength. Therefore, different numbers of wetting‐drying cycles could induce different degrees of damage to coal, which increases progressively through gradual changes to its microstructure. These findings indicate that wetting‐drying cycles have a more significant impact on the stability of coal mass than continuous wetting. Our results are of use in determining the size of coal pillars, and expanding the knowledge base related to the mechanical properties of coal mass, water bursting, water recharge channels, and the stress‐crack‐permeability evolution law in mines.

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Section: Introductionmentioning

confidence: 99%

Influence of cyclic wetting‐drying on the mechanical strength characteristics of coal samples: A laboratory‐scale study

Chen

Jiang

Wang³

et al. 2019

Energy Science & Engineering

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“…For example, the unconfined compression strength of sandstone specimens was measured by Hale and Shakoor [13] after 50 wet-dry cycles in total. ey pointed out that there is no obvious reduction in UCS.Özbek [15], Khanlari and Abdilor [16], and Zhao et al [17] obtained similar results after different wet-dry cycles. However, a sharp decrease in uniaxial compression strength (reduced by 86.1%, after 8 cycles), tensile strength (reduced by 73.42%, after 10 cycles), and fracture toughness (reduced by 52.4%, after 7 cycles) was reported by Yao et al [18], Liu et al [19], and Hua et al [20], respectively.…”

Section: Introductionmentioning

confidence: 83%

“…Based on the accelerated wet-dry method, many researchers have conducted the study on mechanical and physical properties of rock materials after cyclic wet-dry treatment [5,7,9,10,[12][13][14][15][16], such as density, porosity, water absorption, slake durability index, P-wave velocity, static uniaxial compression strength (UCS), tensile strength, and fracture toughness. Although it is impractical to test each property index of weathered rocks, it is universally accepted that cyclic wet-dry reduces both mechanical and physical properties of rock materials to varying degrees.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Compression Properties and Deterioration of Red‐Sandstone Subject to Cyclic Wet‐Dry Treatment

Bai

2019

Advances in Civil Engineering

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Rock engineering is usually associated with impact loads induced by blasting, drilling, vibration, or earthquake. In the engineering fields of tunnelling, slopes, dams, and mining, rocks are always subjected to cyclic wet-dry caused by periodical variation in moisture. To study cyclic wet-dry effects on dynamic compression properties and deterioration of red-sandstone, physical tests and dynamic and static tests were conducted after 0, 5, 10, 15, and 20 wet-dry cycles. Changes in physical and mechanical parameters, including P-wave velocity, density, and static and dynamic compression strength, were determined. Deterioration of red-sandstone caused by wet-dry cycles was verified through physicomechanical parameters, and the microscopic features were scanned by SEM techniques. Experimental results showed that the dynamic compression strength increased with the loading rate, but decreased with the increase of wet-dry cycles. In terms of the loading rate, the decay function model was proposed to evaluate the long-term dynamic compression strength of red-sandstone against cyclic wet-dry action. Besides, the function of the loading rate was obtained. Parameters of two models, decay constant and half-life values, were measured accurately.

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“…In addition, Yuan and Ma [27], and Zhou et al [28,29] studied the dynamic mechanical behavior of selected sandstones under cyclic wetting-drying. The cyclic wetting-drying and freezing-thawing effects on some of the mechanical parameters of the selected rock materials were studied by Hale and Shakoor [30], Khanlari and Abdilor [31], and Özbek [32]. Moreover, Li and Zhang [33] proposed a damage model, which considered the wetting and drying effect, to characterize the variation in the uniaxial compressive stress-strain for sandstone.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mixed Mode Fracture Behavior of Sandstone under Water–Rock Interactions

Hua

Dong

et al. 2019

Processes

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Water–rock interactions can significantly deteriorate the physical and mechanical properties of rocks, and it has been identified as one of the significant factors influencing the stability and safety of structures in rock–soil engineering. In this study, the fracture mechanical properties of sandstone under periodic water–rock interactions and long-term immersion have been studied with central cracked Brazilian disk specimens. The degradation mechanism of water–rock interactions was also studied using a scanning electron microscope (SEM). Finally, the generalized maximum tangential stress and generalized maximum tangential strain criteria were adopted to evaluate the experimental results. The results show that periodic water–rock interactions can remarkably affect the fracture resistance of sandstone. With the increase in the number of cycles, the pure mode I, pure mode II, and mixed mode fracture toughness decreases greatly, however, the values of KIf/KIC and KIIf/KIC decrease slightly. Furthermore, the fracture resistance of sandstone influenced by cyclic wetting–drying is more significant than long-term immersion. Moreover, the fracture criteria, which considers the effect of T-stress, can reproduce the test results very well.

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Investigation of the effects of wetting–drying and freezing–thawing cycles on some physical and mechanical properties of selected ignimbrites

Cited by 150 publications

References 14 publications

Influence of cyclic wetting‐drying on the mechanical strength characteristics of coal samples: A laboratory‐scale study

Influence of cyclic wetting‐drying on the mechanical strength characteristics of coal samples: A laboratory‐scale study

Dynamic Compression Properties and Deterioration of Red‐Sandstone Subject to Cyclic Wet‐Dry Treatment

Experimental Study on Mixed Mode Fracture Behavior of Sandstone under Water–Rock Interactions

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