Experimental study on the mechanical properties weakening mechanism of siltstone with different water content

Li, Bingyang; Liu, Jian; Bian, Kang; Ai, Fei; Hu, Xunjian; Chen, Ming; Liu, Zhenping

doi:10.1007/s12517-019-4852-8

Cited by 23 publications

(11 citation statements)

References 42 publications

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“…After the soaking time of 48 h, the water content exhibits no significant change, indicating that the coal specimen is in a saturation condition. is phenomenon is in good agreement with the results of previous studies on rock and coal specimens [6,21,31]. As shown in Figure 2, the water content of this coal under saturation conditions is approximately 3.6%.…”

Section: Coal Sample Preparationsupporting

confidence: 92%

“…On one hand, water injection is an effective method for mitigating and preventing rockburst [1][2][3], coal bumps [4], and coal and gas outburst disasters [5]. On the other hand, water can change the microstructure of rock [6][7][8], induce stress redistribution around a tunnel, and lead to damage or failure of the rock due to a change in its mechanical properties [9]. For example, heavy rains in the summer months may result in landslides [10], water bursting in mines [11], roof fall, and pillar instability [12].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation on the Influence of Water Content on the Mechanical Properties of Coal under Conventional Triaxial Compression

Zhang

Rongshan

2020

Shock and Vibration

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The presence of water is one of the most important factors in coal mining, and it has a dual influence on the mechanical behavior of rock. To study the influence of water content on the mechanical properties of coal under complicated stress conditions, dry coal specimens and wet coal specimens with water contents of 1.8% and 3.6% were conducted by uniaxial and conventional triaxial compression tests. The relations between the uniaxial compressive strength, deformation, and water content were observed. The reductions in the strength and elastic modulus under different confining pressures were obtained. The mechanical properties of coal specimens with different water contents under triaxial compression were studied. The influences of water content on the microstructure, clay minerals, internal friction angle, and cohesive force of coal were discussed. The results show that the strengths and elastic moduli of wet specimens are clearly lower than those of dry specimens under different confining pressures. The water content has a significant influence on the postfailure mechanical behavior of coal. The loss rates of strength and elastic modulus decrease with increasing confining pressure. The water content has almost no effect on the internal friction angle, while the cohesive force of the saturated specimens is 36.5% lower than that of the dry specimens. The results can provide a reference for inhibiting the occurrence of disasters during coal mining and exploiting coal efficiently.

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Section: Coal Sample Preparationsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Influence of Water Content on the Mechanical Properties of Coal under Conventional Triaxial Compression

Zhang

Rongshan

2020

Shock and Vibration

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“…Furthermore, the physicochemical reactions between the phyllosilicates present in these stones and water might cause their swelling, promoting the growth of initial microcracks and the formation of new cracks, which reduce the values of σpeak of the saturated specimens. Particularly, although no significant macroscopic changes in geometry of the specimens were found during saturation, illite can increase its volume by 50 or 60% when encounters water, causing microcracks [64]. These effects could have happened with greater intensity in R-3, which is the stone with higher clay minerals (chlorite and illite) contents.…”

Section: Impact Of Water On Peak and Residual Compressive Strength And Tangent Young´s Modulusmentioning

confidence: 94%

“…The increase of hydroxyl ion concentration can accelerate the cracking speed of microcracks under stress. [64], [65].…”

Section: Impact Of Water On Peak and Residual Compressive Strength And Tangent Young´s Modulusmentioning

confidence: 99%

“…Afterward the samples absorb water, the hydrolysis of quartz causes stress corrosion and an area with concentration of microcracks is created in the crack tip zone. The growth of subcritical crack is associated to the moisture and the diffusion rate of water molecules [64]. During the loading process, water decreases the stress threshold of microcrack growth.…”

Section: Impact Of Water On Peak and Residual Compressive Strength And Tangent Young´s Modulusmentioning

confidence: 99%

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Impact of water on peak and residual shear strength parameters and triaxial deformability of high-porosity building calcarenite stones: Interconnection with their physical and petrological characteristics

Rabat

Tomás

Cano

et al. 2020

Construction and Building Materials

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Several studies have found that water can cause substantial reductions of mechanical properties of building stones such as unconfined compressive strength, tangent Young´s modulus or tensile strength. However, the influence of water content on shear strength parameters, triaxial compressive strength and modulus of elasticity under different confining pressures has been scarcely examined. For this reason, the present paper assesses the impact of water on peak and residual compressive strength and tangent Young´s modulus of three porous building geomaterials widely used in civil and architectural constructions under different confining pressure through triaxial compressive tests. Furthermore, the corresponding peak and residual shear strength parameters computed from Mohr-Coulomb (c and ϕ) and from Hoek-Brown (σci and mi) failure criteria are obtained under dry and saturated conditions. Complementary physical and petrological analyses are performed in order to understand the main causes of the effect of water observed in these rock materials. The results indicate that water causes significant reductions of peak and residual compressive strength and tangent Young´s modulus in the tested porous building stones for all the different applied confining pressures. Additionally, important changes of peak and residual shear strength parameters (c, ϕ, σci and mi) are exhibited by the studied stones when become saturated. This could be related to physicochemical changes such as the hydrolysis of quartz and silicates in crack tip region inducing subcritical crack growth (stress corrosion), the decrease of the cement quality and the deterioration of the intergranular bonds due to the dispersion or dissolution of some minerals (calcite or chlorite) and the formation of microcracks caused by the swelling of the clay minerals present in these materials when they come into contact with water.

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Effect of water saturation on the strength of sandstones: experimental investigation and statistical analysis

Huang

2022

Bull Eng Geol Environ

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Experimental study on the mechanical properties weakening mechanism of siltstone with different water content

Cited by 23 publications

References 42 publications

Experimental Investigation on the Influence of Water Content on the Mechanical Properties of Coal under Conventional Triaxial Compression

Experimental Investigation on the Influence of Water Content on the Mechanical Properties of Coal under Conventional Triaxial Compression

Impact of water on peak and residual shear strength parameters and triaxial deformability of high-porosity building calcarenite stones: Interconnection with their physical and petrological characteristics

Effect of water saturation on the strength of sandstones: experimental investigation and statistical analysis

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