Fracturing of an Euler–Bernoulli beam in coal mine pillar extraction

Please, Colin P.; Mason, D. P.; Khalique, Chaudry Masood; Ngnotchouye, Jean Medard T.; Hutchinson, A.J.; Merwe, J.N. van der; Yılmaz, Halil

doi:10.1016/j.ijrmms.2013.08.001

Cited by 25 publications

(11 citation statements)

References 5 publications

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“…The dust is produced from the rock extruded by the cutting tooth; its surface structure changes a large with the effective porosity, specific surface area, and surface free energy increasing [15]. These features are to strengthen the ability of dust particles adsorbing air particles and make its surface form a layer of gas film.…”

Section: Results Analysis and Dust-fall Theory Of Fine Dropletsmentioning

confidence: 99%

Wetting Behavior of Hydrophobic Dust and Dust-Fall Theory of Fine Droplets

Kou

Qiuzu

2015

Braz J Phys

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The wetting behavior of droplets on the surfaces of hydrophobic coal slices is measured with a CCD camera and simulated with the volume of fluid (VOF) numerical method. Experimental results reveal that the contact angle changes exponatially with time and the wettability decreases with the increasing rough microstructures of coal slice surfaces. There is a good agreement between numerical simulations and experimental results. Meanwhile, it is found that droplet with a smaller volume can enhance the hydrophilic. The dust-fall theory of fine droplets is useful to improve the wettability of dust and enlarge the contact ratio between dust and droplets, which can help to design wet-type dust-fall equipment and provide new way for the control of respiratory dust.

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Section: Results Analysis and Dust-fall Theory Of Fine Dropletsmentioning

confidence: 99%

Wetting Behavior of Hydrophobic Dust and Dust-Fall Theory of Fine Droplets

Kou

Qiuzu

2015

Braz J Phys

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“…In the same way, if the model considers the immediate roof as a fixed beam supported at both ends by the pillars (see Supplemental Figure 2), then the right-hand side of Supplemental Equation (4) turns into qL b 2 /12, producing Supplemental Equation (9). Peng and Chiang (1984) proposed a dimensionally correct method of estimating the span of the main fall (Supplemental Equation 10). Evans (1941) performed a seminal set of investigations of roof deformation mechanics and established the notion of a 'voussoir beam' spanning an excavation, using an analogy with the voussoir arch considered in masonry structures (Brady and Brown 2004).…”

Section: Beam Modelmentioning

confidence: 99%

“…Theoretical and empirical models based on the plate-beam theory and bending moment approach (Majumdar 1986;Obert and Duvall 1967) can be used to assess the caving behavior of roof strata. These models can predict main fall (Bilinski and Konopko 1973;Pawlowicz 1967;Peng and Chiang 1984;Singh 1979, 1982;Unrug and Szwilski 1980) and periodic caving spanning from the immediate or main roof (Kuznetsov et al 1973;Peng and Chiang 1984;Sarkar and Chatterjee 1992;Sarkar and Dhar 1993;Sarkar et al 1988). This paper focuses on floor strata failure that results from large-scale roof strata caving, using impact loading mechanics and plate-beam theory (Adler and Sun 1968;Gere and Goodno 2011;Hanna et al 1991;Obert and Duvall 1967).…”

Section: Introductionmentioning

confidence: 99%

The Effects of Caving of a Coal Mine’s Immediate Roof on Floor Strata Failure and Water Inrush

Xiang

Liang

et al. 2015

Mine Water Environ

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Large scale roof strata caving that occurs during coal extraction can irreversibly damage floor strata and result in riskier mining operations. Four research models incorporating floor water pressure were assessed for floor strata failure, using eight methods and two classification systems. A connection between floor strata failure and the coefficient of impact risk was developed. The derived equations represent a potentially effective method for providing a preliminary assessment of the risks associated with floor strata failure due to caving. A classification system of floor failure potential can be constructed to minimize risks during mining.

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“…Shabanimashcool & Li 12 studying the effect of horizontal load on the stability of voussoir beam, the horizontal stress improve the stability of the beam against buckling. Please C.P et al 28 taken the roof layer as a clamped beam and using simple strut and beam theory investigated the fracture of the roof. Please C.P et al 28 taken the roof layer as a clamped beam and using simple strut and beam theory investigated the fracture of the roof.…”

Section: Introductionmentioning

confidence: 99%

“…Zhao et al 27 analyzed the structure instability process of the roof rock beam and point out the stability of the cracked roof rock beam depend on the vertical load and horizontal thrust interaction. Please C.P et al 28 taken the roof layer as a clamped beam and using simple strut and beam theory investigated the fracture of the roof. Most analysis methods were based on static equilibrium, and the internal stress distribution was neglected.…”

Section: Introductionmentioning

confidence: 99%

Failure mechanism and fracture aperture characteristics of hard thick main roof based on voussoir beam structure in longwall coal mining

Zhang

Jin

Song

et al. 2019

Energy Science & Engineering

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The mechanism and fracture aperture of thick hard roof failure were theoretically analyzed from the perspective of elastoplastic mechanics. A uniform load cantilever beam was established by considering the voussoir beam structure and stress condition. According to the stress inverse principle in solving the plane strain problem, the internal stress component analytic solution was deduced. Considering the lateral thrust and shear force and by applying the Mohr-Coulomb failure criterion, the plastic zone boundary equation was obtained. Further analysis of the equivalent stress, equivalent strain, elastic energy density, distortion energy density, and strain energy density was studied with blocks of four different lengths, combined with the rotation angles after failure, to analyze the fissure aperture between straight and curved fracture traces. The theoretical analysis reveals that the deviatoric effect plays the lead role in rupture initiation and propagation; the cracks will deflect during failure, and the fracture trace presents a curved shape. The variation of fracture aperture exhibits a tendency to increase first, then decrease, and then increase along the fracture trace.The analytical approach presented in this paper provides a theoretical basis for determining the main seepage channel flow in underground mining. K E Y W O R D Sfailure mechanism, fracture aperture, theoretical analysis, thick hard roof, underground mining, voussoir beam structure

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Fracturing of an Euler–Bernoulli beam in coal mine pillar extraction

Cited by 25 publications

References 5 publications

Wetting Behavior of Hydrophobic Dust and Dust-Fall Theory of Fine Droplets

Wetting Behavior of Hydrophobic Dust and Dust-Fall Theory of Fine Droplets

The Effects of Caving of a Coal Mine’s Immediate Roof on Floor Strata Failure and Water Inrush

Failure mechanism and fracture aperture characteristics of hard thick main roof based on voussoir beam structure in longwall coal mining

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