Analytical model and application of stress distribution on mining coal floor

Zhu, Shuyun; Jian, Zhen-quan; Hou, Hongliang; Xiao, Weiguo; Yao, Pu

doi:10.1016/s1006-1266(08)60003-6

Cited by 32 publications

(14 citation statements)

References 12 publications

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“…The former analysis reveals that the maximum compressive stress is at the center point (x = 0, y = 0, z = h k /2) of the lower surface of the water-resistant key strata. The main stress of this point can be obtained by (9).…”

Section: Methodsmentioning

confidence: 99%

“…The maximum tensile stress is located in the center point (x = 0, y = 0, z = −h k /2) of the top surface of the key floor. According to (9), the maximum tensile stress at this point is…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, water damage to the mine floor should be studied and the occurrence of water inrush accidents in coal mines, which is a difficult problem to solve, should be effectively curbed [1][2][3]. Several studies have attempted to investigate the problem of floor water inrush and have proposed various approaches, such as the water inrush coefficient [4][5][6], plate model [7][8][9], down three zones [10][11][12], and key strata [13][14][15][16][17]. These studies revealed the mechanism of water inrush considering various aspects and provided positive guidance for mine safety production.…”

Section: Introductionmentioning

confidence: 99%

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Study on the Stability of the Coal Seam Floor above a Confined Aquifer Using the Structural System Reliability Method

Liang

Shan

et al. 2018

Geofluids

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A quantitative method of structural system reliability was proposed to study the influence of random rock mechanical parameters and loads on the stability of the coal seam floor above confined aquifers. To obtain the reliability probability of the floor, two modes of water-resistant floor failure were suggested as follows: (1) mining completely removed the water-resistant key strata of the floor. In this case, the failure modes were of three main types: mining failure, confined water intrusion, and combined mining failure and intrusion.(2) Failure modes included shear and tensile failures when the thickness of the key strata was greater than 0. On the basis of the elastic thin plate theory, the performance function that calculates the reliability probability of all modes could be obtained. The failure modes were regarded as the series system. The Monte Carlo method was employed to calculate the reliability probability of each failure mode and series system. The results showed that the random rock mechanical parameters and loads of the key strata significantly influence the antiwater inrush capacity of the floor. In addition, the water inrush coefficient and reliability probability can be simultaneously used as the evaluation indexes of water inrush risk. Both these indexes could improve the assessment of the reliability of the floor.

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Section: Methodsmentioning

confidence: 99%

“…The maximum tensile stress is located in the center point (x = 0, y = 0, z = −h k /2) of the top surface of the key floor. According to (9), the maximum tensile stress at this point is…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on the Stability of the Coal Seam Floor above a Confined Aquifer Using the Structural System Reliability Method

Liang

Shan

et al. 2018

Geofluids

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“…At present, available methods for controlling floor heaves include floor grouting, floor bolt, closed-form support, concrete inverted arch, stress-relief slot, stress-relief borehole, loosening blasting and the combined forms of the above methods [14][15][16][17][18][19][20][21]. However, when it comes to control of floor heaves in gob-side entry retaining, the much feasible implemented approach is floor bolt method.…”

Section: Control Of Floor Heaves In Gob-side Entry Retainingmentioning

confidence: 99%

Control of floor heaves with steel pile in gob-side entry retaining

Chen

Bai

2016

International Journal of Mining Science and Technology

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“…Поскольку аналитические методы решения дан-ной задачи не позволяют получить достаточную точ-ность описания геомеханической системы при проек-тировании крепей выемочных выработок (Zhu, Jian, Hou, Xiao & Yao, 2008), в качестве математической основы рассматриваемой методики примем метод конечных элементов (МКЭ). Использование сеточ-ных численных методов позволяет выполнить моде-лирование большого числа объектов в пределах од-ной расчетной области, при этом манипулируют их состоянием в широких переделах.…”

Section: постановка задачиunclassified

Development and analysis of computational model of geomechanical system “layered massif – working support”

Fomychov¹,

Pochepov²,

Lapko³

et al. 2016

Min. miner. depos.

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Purpose. Substantiating the method for forecasting rock pressure manifestation in the system "layered massifworking support" on the basis of displacement patterns detection at any arbitrary point of the preparatory working circuit during the computational experiments. Methods.Computational experiments were carried out on the basis of the finite element method using the solid computational domain, provided superlimiting non-linear behavior of the simulated materials. The use of numerical grid methods allows creating geometrically and physically complex simulation models and manipulate their state within a wide range.Findings. The calculations defined that with weak links between adjacent strata, acting shear stresses destroy them in the vicinity of working, and the contiguous rock strata deform with mutual sliding. Analysis of reduced stress area allows to substantiate with accuracy sufficient for mining computations a unified average structure of the computational domain that most comprehensively reflects all the main features of a real mining massif which are likely to influence computational error. This choice ensures the introduced error value within 10% in the entire range of mechanical parameters change of the rock massif strata.Originality. Stress-strain state of frame support and patterns of its change with increasing mining depth are nonlinear, especially with nearby rock strata entering the superlimiting state; formation of the plastic hinges system along the frame support circuit, which causes the development of such replacements that exclude the possibility of further working exploitation.Practical implications. The proposed method allows to determine the optimal indicators of maintaining a working driven in the finely-layered rock massif, which makes it possible to significantly reduce operation costs.

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Analytical model and application of stress distribution on mining coal floor

Cited by 32 publications

References 12 publications

Study on the Stability of the Coal Seam Floor above a Confined Aquifer Using the Structural System Reliability Method

Study on the Stability of the Coal Seam Floor above a Confined Aquifer Using the Structural System Reliability Method

Control of floor heaves with steel pile in gob-side entry retaining

Development and analysis of computational model of geomechanical system “layered massif – working support”

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