Influence of cyclic wetting and drying on physical and dynamic compressive properties of sandstone

Zhou, Zilong; Cai, Xun; Chen, Lu; Cao, Wenzhuo; Zhao, Yuan; Xiong, Cheng

doi:10.1016/j.enggeo.2017.01.017

Cited by 203 publications

(85 citation statements)

References 19 publications

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“…Huang et al [22] found that the tensile strength softening factor decreases with the loading rate. Moreover, static and dynamic loading strength tests of sandstone under water-bearing conditions were carried out by Zhou et al [23,24], revealing that the static and dynamic sandstone strengths decreased by 29.88% and 40.55%, following saturation. e permeability of coal and rock specimens is primarily determined by the presence of fractures and the mineral components of these fractures.…”

Section: Mechanism and Discussionmentioning

confidence: 99%

Analysis of the Dynamic Impact Mechanical Characteristics of Prestressed Saturated Fractured Coal and Rock

Wen

Zhang

et al. 2019

Advances in Civil Engineering

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e natural and water-saturated states of coal samples under static and static-dynamic loads were tested using the Split-Hopkinson pressure bar (SHPB) method and RMT-150 system, respectively. e differences in the strength reduction coefficient and elastic modulus reduction coefficient of water-saturated coal samples under static and static-dynamic loads were discussed. e experimental results for coal were compared with the corresponding characteristics of typical sandstone samples under static and static-dynamic loads. Furthermore, a fracture model of a hydrous wing branch fracture under static-dynamic loading was established based on the theory of fracture damage mechanics. e difference in dynamic strength between coal and sandstone samples for both the natural state and water-saturated state was analyzed. On this basis, the effect of water on the fracture surface of coal and the tensile strength and shear strength of the branch fracture surface were fully considered. In addition, criteria of the branch fracture surface for crack initiation and crack arrest were also established. Finally, the phenomenon of increasing elastic modulus in saturated coal samples was explained with this criterion.

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Section: Mechanism and Discussionmentioning

confidence: 99%

Analysis of the Dynamic Impact Mechanical Characteristics of Prestressed Saturated Fractured Coal and Rock

Wen

Zhang

et al. 2019

Advances in Civil Engineering

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“…With more moisture, the film on the surface of a particle has a greater tendency to act as a lubricant. However, reports on coal [6,9], sandy loam soil [32] and other rocks [33][34][35] illustrated that small changes in the internal friction angle with moisture content can be identified. All values of the internal friction angle in this study are enclosed within a small range between 29.76 • and 31.63 • (Figure 6), showing a very small change.…”

Section: (2) Fitting Results and Discussionmentioning

confidence: 99%

Coupled Effects of Moisture Content and Inherent Clay Minerals on the Cohesive Strength of Remodelled Coal

Zhang

Wan

et al. 2017

Energies

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Injecting water into a coal seam to enhance the cohesive strength of coal and thus minimize and reduce the coal wall spalling risk must be considered in underground coal mining systems. In general, coal with low cohesive strength contains clay minerals which may affect the stability of coal by interacting with water. Therefore, the coupled effects of moisture content and inherent clay minerals on the physical properties (i.e., cohesive strength and internal friction angle) of coal samples should be addressed. In this paper, direct shear tests were conducted by remodelling the Yiluo coal with various moisture contents ranging from 6.6% to 20.7%. According to Mohr-Coulomb failure criterion, cohesive strength and internal friction angle of coal were obtained. Afterwards, effects of moisture content and clay minerals (i.e., Kaolinite, Smectite and Illite) on the cohesive strength of coal were analysed using X-ray diffraction (XRD) method. The results show that cohesive strength increases when the moisture content rises from 6.6% to 17.6%, after which it decreases with increasing moisture content. This trend can be well illustrated by the relationship between typical water retention curve (WRC) and suction stress of soil. Therefore, a moisture content of 17.6% would be an optimal value to enhance the stability of the Yiluo coal seam.

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“…Considering these, dynamic mechanical properties and deterioration predicting of TS-weathered rock are crucial concerns during the whole design, construction and maintenance stages of geotechnical works (Heidari et al, 2013;Zhou et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Dynamic splitting tensile behaviors of red-sandstone subjected to repeated thermal shocks: Deterioration and micro-mechanism

Wang

Fang

et al. 2017

Engineering Geology

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Influence of cyclic wetting and drying on physical and dynamic compressive properties of sandstone

Cited by 203 publications

References 19 publications

Analysis of the Dynamic Impact Mechanical Characteristics of Prestressed Saturated Fractured Coal and Rock

Analysis of the Dynamic Impact Mechanical Characteristics of Prestressed Saturated Fractured Coal and Rock

Coupled Effects of Moisture Content and Inherent Clay Minerals on the Cohesive Strength of Remodelled Coal

Dynamic splitting tensile behaviors of red-sandstone subjected to repeated thermal shocks: Deterioration and micro-mechanism

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