The influence of cyclic wetting and drying on the fracture toughness of sandstone

Hua, Wen; Dong, Shiyun; Li, Yifan; Xu, Ji‐Gang; Wang, Hongtao

doi:10.1016/j.ijrmms.2015.06.010

Cited by 125 publications

(52 citation statements)

References 19 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%

“…Khanlari et al and Hale et al reported that the uniaxial compressive strength (UCS) of sandstone was not significantly reduced even after 40 or 50 wetting‐drying cycles. However, recent studies by Huang et al and Hua et al showed that cyclic wetting‐drying could induce significant deterioration in the sandstone's mechanical properties. These results are similar to those of Deng et al and Yao et al These studies all indicate that cyclic wetting‐drying could influence the mechanical strength of sandstone, but the effect of cyclic wetting‐drying on coal mass has not been widely investigated.…”

Section: Introductionmentioning

confidence: 99%

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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%

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, Dhakal et al (2002) investigated the slake durability of sedimentary rocks, and showed that the size of the rock sample decreased as the number of wetting and drying cycle increases. Hua et al (2015) reported the decrease in fracture toughness of sandstone during cyclic wetting and drying processes. These reports suggest the importance of water exposure on the weakening of rock.…”

Section: Discussionmentioning

confidence: 99%

Evaluating long-term strength of rock under changing environments from air to water

Nara

Tanaka

Harui

2017

Engineering Fracture Mechanics

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It is important to understand time-dependent deformation and fracturing in rock to evaluate its long-term strength (LTS); subcritical crack growth (SCG) provides insight into the weathering of a rock mass over the long term. The LTS of rock is commonly evaluated under the same environmental conditions. However, in practice, the environment is constantly changing and must be accounted for in evaluating the LTS of rock. In this study, we developed a method to evaluate LTS under changing environmental conditions, with a focus on the influence of water on the LTS of rock. LTS decreased rapidly when the environmental conditions changed from air to water. In a case where the environmental conditions changed repeatedly from air to water at various duration intervals, the value of the LTS was similar to that in a continuous water environment. Because a dramatic decrease in the LTS occurred when the environmental conditions changed from air to water, we conclude that the effect of water on the acceleration of SCG in rock should be considered in the long-term use of rock structures. SummaryIt is important to understand time-dependent deformation and fracturing in rock to evaluate its long-term strength (LTS); subcritical crack growth (SCG) provides insight into the weathering of a rock mass over the long term. The LTS of rock is commonly evaluated under the same environmental conditions. However, in practice, the environment is constantly changing and must be accounted for in evaluating the LTS of rock. In this study, we developed a method to evaluate LTS under changing environmental conditions, with a focus on the influence of water on the LTS of rock. LTS decreased rapidly when the environmental conditions changed from air to water. In a case where the environmental conditions changed repeatedly from air to water at various duration intervals, the value of the LTS was similar to that in a continuous water environment. Because a dramatic decrease in the LTS occurred when the environmental conditions changed from air to water, we conclude that the effect of water on the acceleration of SCG in rock should be considered in the long-term use of rock structures.

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“…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. e main causes for this discrepancy are the different mineralogical composition and microstructure (e.g., voids, cementations, texture, and fissures), which affect the sensitivity to cyclic wet-dry treatment [17].…”

Section: Introductionmentioning

confidence: 89%

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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The influence of cyclic wetting and drying on the fracture toughness of sandstone

Cited by 125 publications

References 19 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

Evaluating long-term strength of rock under changing environments from air to water

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

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