Study on “Triaxial Loading-Unloading-Uniaxial Loading” and Microscopic Damage Test of Sandstone

Che, Yong; Guo, Yi; Wang, Wenjun; Cao, Liming; Fan, Liping; Huang, Cong

doi:10.3389/feart.2020.00078

Cited by 11 publications

(7 citation statements)

References 30 publications

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“…9), where the best fit function is a parabola. This recovers the parabolic failure criterion, recently suggested and experimentally verified (see Yuan et al (2020), Wang et al (2019), Singh and Rao (2005)). This also captures the transition from a linear behavior at low confining pressures to a pressure-insensitive behavior for high confinement (Yuan et al (2020)).…”

Section: Dependence Of the Strength On The Confinementsupporting

confidence: 85%

Morphometric description of strength and degradation in porous media

Alexandre¹,

Rattez²,

Veveakis³

2021

Preprint

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The influence of the microstructural geometry on the behavior of porous media is widely recognized, particularly in geomaterials, but also in biomaterials and engineered materials. Recent advances in imaging techniques, such as X-ray microcomputed tomography, and in modeling make it possible to capture the exact morphometry of the microstructure with high precision. However, most existing continuum theories only partially account for the morphometry. We propose here a unifying approach to link the strength of porous materials with the necessary and sufficient microstructural information, using Minkowski functionals, as per Hadwiger's theorem. A morphometric strength law is inferred from synthetic microstructures with a wide range of porosities and heterogeneities, through qualitative 2D phase-field simulations. Namely, the damage is modeled at the microstructural level by tracking the solid-pore interfaces under mechanical loading. The strength is found to be best described by an exponential function of the morphometers, thus generalizing early works on metals and ceramics. We then show that the predictiveness of this relationship extends to real porous media, including rocks and bones.

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Section: Dependence Of the Strength On The Confinementsupporting

confidence: 85%

Morphometric description of strength and degradation in porous media

Alexandre¹,

Rattez²,

Veveakis³

2021

Preprint

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“…The underground geomechanical environment of coal mines is complex and changeable, so the risk assessment of roadway roof falls should involve many factors [15][16][17]. However, the above evaluation method is too simple to correctly judge the actual situation of roof falls in coal mine roadways.…”

Section: Introductionmentioning

confidence: 99%

Application of Research on Risk Assessment of Roadway Roof Falls Based on Combined Weight Matter Element Extension Model

Wang,

Yuan,

et al. 2024

Applied Sciences

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Roof falls in coal mine roadways are the main causes of many casualties, shutdowns and production plan delays. To understand the relationship between the influencing factors of roadway roof fall accidents and the importance ranking of the accidents, we will reduce safety accidents in coal mines. To enable the timely prediction and control of roadway roof fall risks, based on the investigation of many roadway roof fall risk factors, 12 evaluation indexes such as the roadway roof rock thickness, geological conditions and roadway section shape were selected. An evaluation index system of roadway roof fall risks is constructed. A risk degree standard of roadway roof falls is proposed. The risk evaluation model of roadway roof falls was established by using the combination weight of the analytic hierarchy process (AHP), entropy weight method (EW) and matter element extension theory. According to the principle of the maximum membership degree, the risk degree of roadway roof falls is determined. Based on Java Web, a risk assessment system for roadway roof falls was developed. We name the system Multiple Weight-Material Element Web (MW-MEW). The MW-MEW system was used to evaluate the risk degree of roof falls in the C9 return airway of the Xingu Coal Mine. Compared with the evaluation results of the AHP matter element extension model, it is found that the evaluation results of the MW-MEW system are more in line with the actual engineering conditions. The successful application of the MW-MEW system will provide new avenues for the quantitative evaluation of roof fall risks in coal mine roadways.

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“…ese characteristics lead to a decrease in the overall strength and stability of the surrounding rock of gas-coal roadways, leaving them vulnerable to disturbances such as mining activities. Part of the coal body enters a pressurized state from the original stress state, and its internal cracks shrink and close, causing the gas pressure to increase [1][2][3]. Under the influence of multiple factors (e.g., high ground stress, mining, and gas pressure), the surrounding rock of gas-coal roadways exhibits a series of engineering response characteristics during service periods, such as asymmetry and large-scale instability failures.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis on Distribution Pattern of Plastic Zone in Surrounding Rock of High‐Gas‐Coal Roadway

Che

Cao

Fan

et al. 2021

Advances in Civil Engineering

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The formation and expansion of the plastic zone is always accompanied by the deformation and failure of the roadway-surrounding rock. Based on elastoplastic theory, this paper considers the gas pressure parameters and uses the Mohr–Coulomb strength criterion to derive the implicit equation of the plastic zone boundary in the rock surrounding gas-coal roadways. The distribution characteristics of the plastic zone of gas-coal roadway-surrounding rock are studied, and the sensitivity to the gas pressure, cohesion, internal friction angle, and support strength of the roadway free face on the plastic zone of the surrounding rock is analyzed. The research results show that the plastic zone of the surrounding rock has four distribution patterns: circular, elliptical, rounded rectangle, and butterfly. Additionally, the lateral pressure coefficient, gas pressure, cohesion, and internal friction angle are found to jointly determine the distribution and range of the plastic zone. However, the support strength of the roadway free face does not change the distribution of the plastic zone but only affects its range. The circular and elliptical plastic zones are less sensitive to gas pressure, cohesion, and internal friction angle, whereas butterfly-shaped plastic zones are highly sensitive to these factors. The main manifestation of this sensitivity is that the four butterfly leaves degenerate rapidly with any decrease in the gas pressure or increase in the cohesion and internal friction angle. Larger butterfly leaves are prone to faster degeneration. The research results presented in this paper have important theoretical guiding significance and engineering application value for the design of high-gas-coal roadway support and gas drilling.

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Study on “Triaxial Loading-Unloading-Uniaxial Loading” and Microscopic Damage Test of Sandstone

Cited by 11 publications

References 30 publications

Morphometric description of strength and degradation in porous media

Morphometric description of strength and degradation in porous media

Application of Research on Risk Assessment of Roadway Roof Falls Based on Combined Weight Matter Element Extension Model

Theoretical Analysis on Distribution Pattern of Plastic Zone in Surrounding Rock of High‐Gas‐Coal Roadway

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