Mechanical performances of rock-concrete bi-material disks under diametrical compression

Xu, Chang; Lu, Jianyou; Wang, Shanyong; Wang, Shuren

doi:10.1016/j.ijrmms.2018.02.008

Cited by 50 publications

(11 citation statements)

References 20 publications

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“…The isotropy of the specimen was weakened due to the thermal damage at the top and bottom is uneven. Therefore, the results calculated by equation ( 2) were only used for comparison, the tensile strength obtained under static and dynamic conditions were called the corresponding nominal tensile strength (NTS) and nominal dynamic tensile strength (NDTS), respectively (Chang et al, 2018).…”

Section: Methodsmentioning

confidence: 99%

Experimental investigation on the effect of open fire on the tensile properties and damage evolution behavior of granite

Yin

Yang

et al. 2022

International Journal of Damage Mechanics

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The stability of rock mass after fire is a concern of many engineering projects. In this paper, the effects of open fire and different cooling methods on granites were investigated. The static Brazilian test, dynamic Brazilian test, and P-wave velocity test were carried out to evaluate the mechanical properties and damage evolution behavior. A high-speed camera is employed to monitor the failure process of rock. The microstructures of the treated granites were observed by scanning electron microscope (SEM). The results showed that the fire duration and cooling treatment have a significant effect on the P-wave velocity, static nominal tensile strength, and dynamic nominal tensile strength of granite. These characteristics decrease rapidly during 0 to 10 min, and slowly decrease after 20 min. Compared to the air-cooling treatment, the water-cooling treatment has greater damage to the heated granite. To better understand the results, the rapid heating process of open fire heating was simulated using Abaqus software. The results reveal that there is a thinner compressive stress zone at the bottom of the specimen, and there is a large zone in the middle of the sample with higher tensile stress. The crack extension would be expanded due to high tensile stress, leading to the reduction of the tensile strength of the rock. This paper aims to better predict the degree of damage of rock materials after actual fire, as well as preliminarily explore the effect of the fire exposure duration and fire extinguishing method on the tensile properties of rock.

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Section: Methodsmentioning

confidence: 99%

Experimental investigation on the effect of open fire on the tensile properties and damage evolution behavior of granite

Yin

Yang

et al. 2022

International Journal of Damage Mechanics

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“…Different kinds of rocks are plotted in the chart with each kind of rock in a group. The data of 146 specimens used in the chart are all from the literature [19][20][21][22][23][24][25], in which the Young's modulus and the tensile strength are derived from laboratory experiments. Rocks towards the top right have a high value of strength and elasticity and therefore can sustain a higher value of stress.…”

Section: Coal-gas Outburst and Coal Seam Roof Instabilitymentioning

confidence: 99%

Geomaterials Evaluation: A New Application of Ashby Plots

Sun

Zhao

2020

Materials

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The development of fossil energy resources and the occurrence of geological hazards call for a quick and effective identification of geological situations. In this study, we present rapid evaluations of geological structures from the pure point of view of material properties. For the first time, Ashby plots are applied to the evaluation of geomaterials such as rocks and coals. A series of case studies are presented and related Ashby plots are drawn. The stability of rocks facing natural hazards is analyzed and compared; the stability of coals formed in different periods in China is studied; and a new brittleness index for reservoir rocks is proposed. The Ashby plots show a strong vitality and a wide application prospect in geomaterial evaluation and geological engineering.

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“…While few studies have focused on the properties of the rock-CGFB bimaterials, Chen et al [18] preliminarily investigated the mechanical properties of sandstone-CGFB bimaterials. Other studies have investigated the shear failure characteristics [36,37], failure mechanisms [38,39], and tensile performances of the rock-concrete bimaterials [40].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Properties of Rock‐Cemented Coal Gangue‐Fly Ash Backfill Bimaterials with Different Coal Gangue Particle Sizes

Wang

Yin

Chen

et al. 2020

Advances in Civil Engineering

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Properties of rock-cemented coal gangue-fly ash backfill (CGFB) bimaterials determine the effects of strip CGFB mining on controlling the surface subsidence in coal mines, which are affected by the coal gangue particle size in CGFB. In this paper, uniaxial compression tests were conducted on the coarse sandstone-CGFB composite samples with different coal gangue particle sizes, and their strength, acoustic emission (AE), and failure characteristics were investigated. The uniaxial compressive strength (UCS) and elastic modulus of the composite sample decreased with the coal gangue particle size. The strength of the composite sample is mainly dependent on that of CGFB in it, affected by interactions between CGFB and coarse sandstone. The deformation of the coarse sandstone weakened the damage accumulation within CGFB, resulting in the strength of the composite sample larger than that of CGFB. The average UCS values of composite samples with coal gangue particle sizes of 0∼5 mm, 5∼10 mm, and 10∼15 mm, increased by 10.78%, 14.98%, and 12.70% compared with CGFB in them, respectively. AE event signal regularity of the composite sample was divided into three stages: rising period, calm period, and active period. The intensity and frequency of AE event signals in three periods were strengthened with the coal gangue particle size. The calm period can be taken as the precursory information for the failure and instability of composite sample under loading, whose duration became shortly with the coal gangue particle size. The rebound deformation of coarse sandstone caused the fluctuations of AE event signals at the later stage of active period. The failures of the composite sample occurred within CGFB, and no obvious failures were found in the coarse sandstone. The CGFB mainly experienced the splitting failure accompanying by varying degrees of surface spalling failures. The broken degree of CGFB increased with the coal gangue particle size, and the largest weight ratio of CGFB fragments (chips) after failure was determined by the coal gangue particle size.

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Mechanical performances of rock-concrete bi-material disks under diametrical compression

Cited by 50 publications

References 20 publications

Experimental investigation on the effect of open fire on the tensile properties and damage evolution behavior of granite

Experimental investigation on the effect of open fire on the tensile properties and damage evolution behavior of granite

Geomaterials Evaluation: A New Application of Ashby Plots

Experimental Study on Properties of Rock‐Cemented Coal Gangue‐Fly Ash Backfill Bimaterials with Different Coal Gangue Particle Sizes

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