Analytical approaches for studying the stability of laminated roof strata

Shabanimashcool, Mahdi; Li, Charlie C.

doi:10.1016/j.ijrmms.2015.06.007

Cited by 66 publications

(33 citation statements)

References 15 publications

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“…Substituting Equation (7) into Equation (12) and combining with Equation (11) yields the other coefficient expressions:…”

Section: Internal Stress Component Solutionmentioning

confidence: 99%

“…[17][18][19][20][21][22] On the basis of spatial structure evolution and load conditions, analyses typically simplify the unit thickness on the working face middle to a beam model, [23][24][25][26] such as clamped beam, simply supported beam, and voussoir beam; the voussoir beam approach is a kind of structure widely used and was developed rapidly. 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. 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.…”

Section: Introductionmentioning

confidence: 99%

“…using various methods, including theoretical research, [10][11][12] in situ investigation, [13][14][15][16] and physical and simulation analysis. [17][18][19][20][21][22] On the basis of spatial structure evolution and load conditions, analyses typically simplify the unit thickness on the working face middle to a beam model, [23][24][25][26] such as clamped beam, simply supported beam, and voussoir beam; the voussoir beam approach is a kind of structure widely used and was developed rapidly.…”

Section: Introductionmentioning

confidence: 99%

“…These studies on the structural model of the main roof overlying strata often model the rock beam as a continuous medium and then analyze the stability and failure of the rock beams. 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. 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.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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“…Substituting Equation (7) into Equation (12) and combining with Equation (11) yields the other coefficient expressions:…”

Section: Internal Stress Component Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

show abstract

“…The coal mining process results in a large-scale HMR hanging in the gob, which is difficult to collapse naturally. A sudden collapse of this roof when the area of hanging roof reaches a certain value would be disastrous and could result in a shock wave or hurricane, for example [5][6][7]. Following this, mining equipment would be seriously damaged, the normal mining activities would be terminated, and casualties would occur [8,9].…”

Section: Introductionmentioning

confidence: 99%

A Case Study of Presplitting Blasting Parameters of Hard and Massive Roof Based on the Interaction between Support and Overlying Strata

Zhang

Chen

2018

Energies

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Due to the existence of a hard and massive roof (HMR), severe ground pressure behaviors have been observed at the working face, resulting in safety issues and the degradation of production effectiveness. Based on the HMR conditions of the Datong Mining Area, the fracture-related instability of the HMR and its effects on the support selection were investigated by analyzing the interaction between support and overlying strata. Advancefixed-distance presplitting blasting (AFPB) technology was proposed to control the caving interval of HMR, and the influence of the controlled interval on the working load of supports was also analyzed. The working load of the support and the caving interval of the HMR were determined based on the controlled HMR fracture technology, and these were verified by field application tests. The working resistance of the support and the step distance were determined based on controlled roof fracture and were verified by on-site application experiments. The results revealed that cracks emerged after the presplitting blasting, resulting in significantly reduced strata behaviors. Furthermore, the support exhibited good adaptability.

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Analytical examination for the stability of a competent stratum and implications for longwall coal mining

2019

Energy Science & Engineering

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Rational estimation of the mechanical state of a competent rock layer is of prime importance for structural and support design in longwall coal mining. This paper analytically examines the stability of a voussoir‐structured stiff rock by considering it acting as a symmetric flat arch with discontinuities at the abutments and midspan. Three typical failure modes including snap through, midspan crush and sliding failure are inspected. The solution assumes that the shape of the compressive arch obeys a parabolic variation as the voussoir beam deflects downwards with large‐deformation. The crush failure due to stress concentration in the beam hinge is predicted by relating the squeezing area with the beam rotation, which is absent in previous studies. The proposed approach can examine the voussoir beam stability without cumbersome iteration. Primarily, this work facilitates the evaluation of the support requirements to reinforce roof beds in longwall panels. After accounting for the total loads of the overlying rock layers, the stability assessment developed in this paper can further be utilized to predict the span limit of the main roof above a longwall panel and to estimate the critical width which governs the magnitude of mining subsidence.

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Analytical approaches for studying the stability of laminated roof strata

Cited by 66 publications

References 15 publications

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

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

A Case Study of Presplitting Blasting Parameters of Hard and Massive Roof Based on the Interaction between Support and Overlying Strata

Analytical examination for the stability of a competent stratum and implications for longwall coal mining

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