Effect of water saturation and loading rate on the mechanical properties of Red and Buff Sandstones

Kim, E.; Changani, Hossein

doi:10.1016/j.ijrmms.2016.07.005

Cited by 91 publications

(32 citation statements)

References 19 publications

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“…To identify the tensile strength of rock under different contact conditions, numerical calculations and experimental investigations were conducted [3,4,8,18,19]. e existing investigations provided a comprehensive reference for testing the tensile strength of rock in geotechnical engineering to a certain extent [20][21][22][23][24][25]. Furthermore, the results of many tensile tests showed that the tensile strength of rock exhibits a clear loading rate effect, i.e., the tensile strength increases with the loading rate [20,24].…”

Section: Introductionmentioning

confidence: 99%

“…e existing investigations provided a comprehensive reference for testing the tensile strength of rock in geotechnical engineering to a certain extent [20][21][22][23][24][25]. Furthermore, the results of many tensile tests showed that the tensile strength of rock exhibits a clear loading rate effect, i.e., the tensile strength increases with the loading rate [20,24]. However, from the investigations, only one or two loading methods were qualitatively compared at a given loading rate, and the conclusions were applicable only in particular cases.…”

Section: Introductionmentioning

confidence: 99%

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Loading Rate Effect of Rock Material with the Direct Tensile and Three Brazilian Disc Tests

Gong

Wang

2019

Advances in Civil Engineering

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A series of experimental tests were conducted to investigate the effects of loading rate on the tensile strength of sandstone by using four test methods, including a direct tensile method and three typical Brazilian disc methods (plate loading, circular arc loading, and strip loading). e loading rates used in these tests varied from 10 −2 MPa/s to 10 0 MPa/s. e results show that the rate effects are clear for these test methods, and the tensile strength of sandstone will increase linearly with the logarithm of the loading rate. At the same loading rate, it is found that the tensile strengths of the sandstone specimens under plate loading and arc loading are relatively similar and are much greater than the direct tensile strength, while the tensile strength under strip loading is less than the direct strength. A comprehensive comparison suggested that the strip loading method can be adopted for the Brazilian disc test, while the obtained strength should be modified with a coefficient of 1.37 to obtain the direct tensile strength.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Loading Rate Effect of Rock Material with the Direct Tensile and Three Brazilian Disc Tests

Gong

Wang

2019

Advances in Civil Engineering

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“…Five groups of coal specimens with different water-soaking heights (0 mm, 25 mm, 50 mm, 75 mm, 100 mm) were prepared for the tests, which are listed in Table 2 and shown in Figure 4. Before the start of the water-soaking test, all the coal specimens were placed in the oven, maintained at 105 °C temperature [26,27], and dried for 24 h. Then the weights of the dried specimens were measured. Subsequently, the water soaking test was carried out.…”

Section: Water Soaking Experimentsmentioning

confidence: 99%

Effects of Water-Soaking Height on the Deformation and Failure of Coal in Uniaxial Compression

et al. 2019

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The stability of water-preventing coal pillar plays an important role in preventing gob water inrush. The gob side of the water-preventing coal pillar is soaked in a certain height of mine water. Different soaking heights may affect the stability of coal pillars. Few studies have been conducted on the properties of coals with different water-soaking heights. We carried out uniaxial compressive tests on coal specimens with different water-soaking heights to gain a better understanding of different water-soaking-height-induced weakening characteristics of coal. Results show that: (1) The water content of coal specimens increases with the soaking height. Water significantly weakens the strength of coal specimens. However, the extent of strength weakening of the coal specimen does not increase with the increase of the soaked height. The strength of the fully soaked coal specimen is lowest among all groups of coal specimens. The strength of the three groups of partially soaked coal specimens is between the fully soaked coal specimens and the coal specimens without being soaked in the water. In the three groups of partially soaked coal specimens, the strength of the coal specimens increases with the increase of the soaking height. (2) The acoustic emission activities of complete water soaking and nonsoaking coal specimens are relatively concentrated, occurring mainly in unstable fracture expansion stage and post-peak destruction stage, and acoustic emission exhibits main-shock mode. Partially soaking coal specimens, especially the 25% water-soaking height and 50% water-soaking height coal specimens, produces obvious acoustic emission activities during the fracture expansion stabilization phase, and then generates more acoustic emission activities during the unstable expansion stage and the post-peak stage. The acoustic emission presents foreshock-main shock mode. (3) The softening effect of the water soaking on the coal specimens is obvious. It was further found that the deformation of coal specimens with partial water soaking is not synchronized in different layers, the nonuniform deformations of partially soaked coal specimens aggravate its damage.

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“…In recent years, several studies on water content affecting the mechanical properties of different types of rocks, including uniaxial compressive strength, cohesion resistance, tensile strength, and fracture resistance, have been conducted by researchers [4][5][6][7][8][9][10][11][12]. The results showed that even if the water content had a small increment, it might make the strength and stiffness of the rocks reduce remarkably, which means that the water content could significantly degrade the mechanical properties of rock materials.…”

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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Effect of water saturation and loading rate on the mechanical properties of Red and Buff Sandstones

Cited by 91 publications

References 19 publications

Loading Rate Effect of Rock Material with the Direct Tensile and Three Brazilian Disc Tests

Loading Rate Effect of Rock Material with the Direct Tensile and Three Brazilian Disc Tests

Effects of Water-Soaking Height on the Deformation and Failure of Coal in Uniaxial Compression

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

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