Numerical analysis of underground space and pillar design in metalliferous mine

Malli, Tahir; Yetkin, Mustafa Emre; Özfırat, M. Kemal; Kahraman, Bayram

doi:10.1016/j.jafrearsci.2017.07.018

Cited by 31 publications

(14 citation statements)

References 14 publications

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“…Yuan Zhang [19] studied the distribution law of abutment pressure in deep stope, established a dynamic mechanical model of the roof structure, and finally proposed the optimum design method of coal pillar width of gob-side entry with prevention of large deformation of roof as the core. T. Mallhao et al [20] studied the evolution law of the vertical stress of coal pillars in four different stages by numerical simulation and established the coal pillar stability prediction model to solve the size design in room pillar mining. Zhang Wei et al [21] analyzed the distribution characteristics of the advancing abutment pressure of gob-side entry on insular face; they constructed a model of the structural mechanics of surrounding rock of gob-side entry with narrow coal pillar on the insular face.…”

Section: State Of the Artmentioning

confidence: 99%

Distribution Law of Principal Stress Difference of Deep Surrounding Rock of Gob-side Entry and Optimum Design of Coal Pillar Width

Qiang

Wang

et al. 2019

Teh. vjesn.

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The optimum design of deep-coal pillar width at the gob-side entry is the key to control surrounding rocks. Existing studies on this issue are based on the distribution law of mining abutment pressure without considering the principal stress difference distribution, which is related to the shear failure of surrounding rock. This study aimed to optimize the design of deep-coal pillar width at gob-side entry based on the distribution law of the principal stress difference. With FLAC 3D numerical simulation, the distribution characteristics of principal stress difference in the side mining stress field of the deep mining face and the distribution laws of the principal stress difference of the surrounding rock at the gob-side entry under different coal pillar width were explored. According to the distribution characteristics of the principal stress difference, the coal and rock mass on the goaf side in the deep mining face could be divided into three zones, i.e., decreasing, increasing and stable zones. Results show that the principal stress differences of the deep surrounding rock on the roof, floor, and coal wall rib at the gob-side entry present a single-peak curve distribution under different coal pillar width. However, the principal stress difference of the surrounding rock on the coal pillar rib displays a single-peak curve when the coal pillar width is less than or equal to 8 m, but a double-peak curve appears when the coal pillar width is greater than 8 m. The peak value of the shallow surrounding rock is obviously smaller than that of the deep surrounding rock. The width of the coal pillar of the gob-side entry in 11030-tunnel was optimized according to the theoretical calculation. This work provides a novel idea and method for the arrangement of deep coal pillars of gob-side entry.

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Section: State Of the Artmentioning

confidence: 99%

Distribution Law of Principal Stress Difference of Deep Surrounding Rock of Gob-side Entry and Optimum Design of Coal Pillar Width

Qiang

Wang

et al. 2019

Teh. vjesn.

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“…Numerical modelling for the stability analysis of mines and underground quarries has been widely used (Martin and Maybee, 2000;Canbulat et al, 2002Canbulat et al, , 2000Castellanza et al, 2010;Ferrero et al, 2010;Ferrero and Segalini, 2011) . More recently, works on the stability analyses of quarries using numerical methods have been presented by Oggeri and Oresti (2015), Rathore (2016), Arslan (2017) and Malli et al (2017). Nevertheless, no particular work has addressed directly the jointed chalk quarries of North France.…”

Section: Objectivementioning

confidence: 99%

A practical tool for the stability estimation of underground quarries in North France

Rafeh

Mroueh

Hitti

et al. 2019

WJE

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Purpose The presence of underground quarries in North France in close proximity to urbanized areas, imposes serious problems in terms of security of both people and constructions at one hand, and induces a strong constraint against planning and urban development on the other hand. The purpose of this paper is to provide a practical tool for the preliminary estimation of the stability of underground quarries. Design/methodology/approach In this paper, a numerical stability study of quarries, excavated in chalk of North France with or without joints, by the method of rooms and pillars, is presented. This integrates the data provided from site: mechanical properties of the chalk and geometric characteristics of the quarries (width of the pillar W, height of the pillar H and span between pillars L), as well as the orientation of the joints (α). Numerical parametric analysis is conducted using FLAC 3D. Factors of safety are computed from the numerical models. Then, a second-order regression technique is applied on these numerically obtained factors, to correlate new formulae. Findings As a result, user-friendly formulae for the calculation of factors of safety Fs (ex) are extrapolated. Besides, abacuses to determine the minimum permissible effective width of safe pillars are proposed. Originality/value By this, it becomes possible, knowing only few parameters about geometry and properties, to give a fast estimation of the stability state of any quarry in the region.

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“…The FLAC-3D software is a professional tool used to simulate the stress and deformation of rock materials under loading conditions [25], and can be used to simulate the water injection process for reducing stress concentration and the danger of rockbursts. The simulated area is based on the conditions of the No.…”

Section: Model and Parametersmentioning

confidence: 99%

Time Effect of Water Injection on the Mechanical Properties of Coal and Its Application in Rockburst Prevention in Mining

Liu

Zhang

et al. 2017

Energies

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Coal seam water injection is widely used to prevent rockbursts in coal mines, and the duration of water injection is an important parameter related to the effectiveness of rockburst prevention, making it of practical importance to optimize the effective water injection duration. This paper presents the test results of the mechanical properties and pore structure of samples with different soaking time, obtained from a working face where rockburst occurred. Soaking time changes the mechanical properties of samples, and this time effect differs with the coal size (from centimeter to nanometer size). Results of numerical simulation and on-site tests in the Changgouyu coal mine demonstrated that water injection can effectively soften coal bodies and release or transfer stresses, and the time effect of water injection on rock prevention and control is apparent.

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Numerical analysis of underground space and pillar design in metalliferous mine

Cited by 31 publications

References 14 publications

Distribution Law of Principal Stress Difference of Deep Surrounding Rock of Gob-side Entry and Optimum Design of Coal Pillar Width

Distribution Law of Principal Stress Difference of Deep Surrounding Rock of Gob-side Entry and Optimum Design of Coal Pillar Width

A practical tool for the stability estimation of underground quarries in North France

Time Effect of Water Injection on the Mechanical Properties of Coal and Its Application in Rockburst Prevention in Mining

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