Effect of water imbibition on uniaxial compression strength of sandstone

Liu, Honglei; Zhu, Wancheng; Yu, Yang; Xu, Tao; Li, Rufei; Liu, Xige

doi:10.1016/j.ijrmms.2019.104200

Cited by 65 publications

(25 citation statements)

References 17 publications

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“…For example, the weathering of granitic and gneissic rocks in tropical regions can reach depths of more than 100 m [23,24].Ündül and Tugrul [25] investigated the changes in physical properties of dunite due to weathering. As shown in Figure 1(a), it is found that dunites generally show similar trends to other rock types; i.e., uniaxial compressive strength decreases with weathering process [25,[29][30][31]. e tests on the influences of freeze-thaw cycles on the mechanical properties of biotite granite showed that the elastic modulus reduced exponentially with the number of freeze-thaw cycles, as well as compressive strength and cohesive strength (as shown in Figure 1(b) [28]).…”

Section: Introductionmentioning

confidence: 71%

The Time-Dependent Failure Mechanism of Rocks and Associated Application in Slope Engineering: An Explanation Based on Numerical Investigation

Liu

et al. 2020

Mathematical Problems in Engineering

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In this study, a numerical model for long-term deformation and progressive failure of rock slope is presented. The model accounts for both rock heterogeneity and the initiation, activation, nucleation, and coalescence of cracks in rock slope through a stochastic local stress field and local rock degradation by using an exponential softening law. The time-dependent behaviour of rocks is taken as a macroscopic consequence of damage evolution and strength degradation in microstructure. A series of demonstrative slope cases containing preexisting joints are constructed and investigated. The slope instability occurs at a particular point in time when the rock strength is reduced to a certain value. The temporal and spatial evolution of joint linkage structures is numerically obtained, which clearly shows how the local stress field and damage evolution within the joint network contribute to the fracture pattern and the long-term instability. Then, a practical slope case in jointed and layered rock formations in Yunyang city is studied. The prevailing failure phenomena of the slope, including gradual surface scaling, sliding collapses, and block falling, are numerically reproduced, with an emphasis placed on the slope failure process and development tendency. There is a good agreement on the failure mode and instability time between the numerical simulations and the field observations.

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Section: Introductionmentioning

confidence: 71%

The Time-Dependent Failure Mechanism of Rocks and Associated Application in Slope Engineering: An Explanation Based on Numerical Investigation

Liu

et al. 2020

Mathematical Problems in Engineering

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“…rough the uniaxial compression test, Liu et al [39] found that the failure mode was mainly tensile failure when the sample was partly wetted with water, but shear failure dominated for the specimens that were fully saturated with water. However, by comparing the failure modes between natural specimens and saturated specimens in our research, we found that the failure mode of rock in the natural state and saturated state is basically consistent under the same confining pressure.…”

Section: Failure Mode and Failure Mechanismmentioning

confidence: 99%

Experimental Study on the Mechanical Behavior of Yunnan Limestone in Natural and Saturated States

Zhang

Ren

Meng

et al. 2021

Advances in Civil Engineering

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Rock material is a kind of mineral assemblage with complex structural heterogeneity, whose mechanical behavior is strongly affected by water or moisture content. In this work, we carried out a series of laboratory tests to investigate the mechanical response (e.g., deformation, strength, and failure characteristics) of Yunnan limestone in natural and saturated states. Our test results show that (1) after saturation, the stiffness and strength of Yunnan limestone degenerate considerably. Compared with the natural condition, the elastic modulus, deformation modulus, and tensile modulus decrease by about 30% on average, and uniaxial compressive strength and tensile strength also decrease by about 15% and 20%, respectively. While Poisson’s ratio is less affected by water content, it can be regarded as a constant; (2) the elastic modulus and deformation modulus of Yunnan limestone are significantly affected by confining pressure, and the relationship between them and confining pressure satisfies the law of hyperbolic function; (3) the peak strength envelope of Yunnan limestone has significant nonlinear characteristics, which can be well described by generalized Hoek-Brown strength criterion. However, the generalized Hoek-Brown criterion does not apply to the residual strength, which shows a linearly increasing trend with the increasing confining pressure; (4) the failure modes of Yunnan limestone are significantly dependent on confining pressure but insensitive to water content. With the increasing confining pressure, the failure modes of Yunnan limestone transform from splitting failure, tension-shear mixed failure, single inclined plane shear failure to Y-shaped or X-shaped conjugated shear failure. The test results can provide important experimental data for the establishment of the constitutive model of Yunnan limestone, which will contribute to obtain more reliable results for stability assessment of Xianglu Mountain Tunnel.

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“…The two sides moved towards the free surface, and then metal mesh and trapezoidal beam were subject to the tensile and shear failure (Figure 5(c)). Finally, the roof collapse accident happened along the weak Based on the field investigation, the mine water was the main cause of the large deformation of surrounding rock [35]. Therefore, it was necessary to research the influence of mine water on the mudstone parameters by laboratory tests to obtain the instability mechanism of haulage roadway.…”

Section: Deformation Characteristics Of Soft Rock Roadwaymentioning

confidence: 99%

Modeling and Simulation of Deformation Mechanism of Soft Rock Roadway considering the Mine Water

Chen

et al. 2020

Geofluids

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The existence of coal mine water has an important influence on the instability of soft rock roadway in mining engineering. Considering the effect of mine water, a case study on the fracture mechanism and control technology of soft rock roadway was performed in this paper. The results showed that with the increase of moisture content, the uniaxial compressive strength of mudstone nonlinearly decreased, while the tensile strength, Young’s modulus, cohesion, and friction angle tended to a linear decrease approximately. Meanwhile, with the increase of the weakening coefficient, the axial force of the anchorage body increased gradually, while the maximum shear stress decreased gradually. With the increase of moisture content, the failure zone was further propagated into the deep surrounding rock, resulting in a larger stress relaxation around the roadway, especially in the roof and floor. Finally, the supporting technology of the roadway was proposed, and then its support principle, design process, and parameters were also analyzed in detail. The field monitoring data showed that the support technology can control the surrounding rock deformation effectively and maintain the long-term stability of the roadway.

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Effect of water imbibition on uniaxial compression strength of sandstone

Cited by 65 publications

References 17 publications

The Time-Dependent Failure Mechanism of Rocks and Associated Application in Slope Engineering: An Explanation Based on Numerical Investigation

The Time-Dependent Failure Mechanism of Rocks and Associated Application in Slope Engineering: An Explanation Based on Numerical Investigation

Experimental Study on the Mechanical Behavior of Yunnan Limestone in Natural and Saturated States

Modeling and Simulation of Deformation Mechanism of Soft Rock Roadway considering the Mine Water

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