Sensitivity analysis of support safety factor for predicting the effects of contributing parameters on roof falls in underground coal mines

Palei, Sanjay Kumar; Das, Sourav

doi:10.1016/j.coal.2008.05.004

Cited by 55 publications

(21 citation statements)

References 3 publications

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“…5. Using Weibull distribution model, the constitutive relation of coal pillar can be described as (10) where & is compression strain, & = w/ H; C O is the strain at the peak of the stress-strain curve, C o = W o / H; m namely homogeneity index is a parameter used to describe the curve shape as the stress changes. …”

Section: Mechanical Modelmentioning

confidence: 99%

Development an instability model for bord-and-pillar goaf using elastic foundation plate theory

Liu

Tan

Deng

et al. 2011

2011 International Conference on Materials for Renewable Energy &Amp; Environment

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Bord-and-pillar mIffing has been widely used in northwestern China, and lots of remains of coal resources such as coal pillars, roof coal, bound coal and so on, is a significant waste. Furthermore, th e accidents caused by the instability of bord-and-pillar goaf are commonly faced problems. These accidents may have detrimental effects on mining areas residents in the form of injury, disability or fatality as well as mining company due to downtimes, interruptions in the mining operations, destruction of land resources, en vironmental pollution and so on. Therefore, studying on instability mechanism of bord-and-pillar goaf for the assessment and management of ground collapse accidents and pillars recovery is essential. In this paper, the instability mechanism of bor d-and-pillar goaf was analyzed based on mining geological and mechanical conditions. Aiming at hard roof goaf, a detailed analysis was developed, in which the pillars were equivalent to continuous elastic Foundation, the roof was equivalent to the elastic foundation plate, a mechanical model of foundation plate on elastic foundation is established, the synergetic instability process of coal pillar-and-roof system was studied, in addition, the mechanical conditions and math criterion of roof failure and the overall instability of coal pillar-and-roof system was given. The results show that bord-and-pillar goaf failure is a pillar-and-roof synergetic instability process, whit pillars' effective area reducing, the roof will fail gradually, this will strengthen the pressure on pillars and accelerate pillars yield, if the effective area lower than its critical value, the goafwill collapse su ddenly.

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Section: Mechanical Modelmentioning

confidence: 99%

Development an instability model for bord-and-pillar goaf using elastic foundation plate theory

Liu

Tan

Deng

et al. 2011

2011 International Conference on Materials for Renewable Energy &Amp; Environment

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“…1 constitute a significant proportion of the total fatal accidents in coal mines. For example, in China there is one death due to roof fall for every 30,000-50,000 m of advancement (Li et al 2007), and in India, roof fall accidents account for 18.18 % of all fatal accidents in coal mines (Palei and Das 2008). Because of this, many scholars have devoted themselves to the theory of rock strata movement over longwall coal mining panels, including the cantilever hypothesis, pressure arch hypothesis, and so on (Apehc 1989;Nejati et al 2012;Mark 2001).…”

Section: Introductionmentioning

confidence: 98%

An Integrated Approach for the Prediction of Underground-Induced Strata Movement over Longwall Coal Mining Panels

Hao

Fan²,

Shan

et al. 2015

Geotech Geol Eng

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A reliable prediction of the strata behavior and support capacity of longwall workings has always been a challenge for mining engineers. It is still difficult to quantitatively predict some important mining parameters, such as support capability and the interval of periodic caving of the major roof under given mining and strata conditions. The reason is that several factors controlling the strata behavior are difficult to determine, such as the bulk factor of the caving zone, strength factor of the major roof and load factor of the overlying rock strata. In this study, the back analysis method is employed to address this problem. This paper illustrates an integrated approach to predict the strata movement behavior and optimum capability of powered roof supports for safe mining. First, this approach uses the empirical method to qualitatively analyze the mining influence zone, then establishes a quantitative prediction model by theoretic analysis method, and solves the optimum values of the factors described in the model with the back analysis method. On the basis of the above research, the support capability and interval of periodic caving of the major roof under similar geological conditions may be calculated by using these suitable values of the factors. Finally, an illustration of the above process is presented in this paper to examine the reliability of this approach. Keywords Coal mining Á Strata movement Á Back analysis Á Support capability Á Interval of periodic caving of major roof List of symbols h i Height of immediate roof (m) h L Height of load layer (m) H b Height of main roof (m) H coal Thickness of coal (m) J Optimal estimated value k l Load factor of q k p Bulk factor of immediate roof k t Strength factor L a Width of support (m) L i Limit span distance of immediate roof (m)

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“…She computed the probability of roof fall by fitting a distribution function to the annual roof fall, while the consequence of roof fall is quantified based on a cost model. Palei and Das [9] collected geotechnical data from fourteen roof fall incidents in an underground coal mine and conducted sensitivity analysis to examine the effects of the contributing parameters on support safety factor and the probability of roof fall. Shahriar and Bakhtavar [10] collected roof fall data from five coal regions, in Iran, to assess and manage the roof fall risk in these regions using a method that previously was applied to landslide risk assessment by Einstein [11].…”

Section: Introductionmentioning

confidence: 99%

Assessment of roof fall risk during retreat mining in room and pillar coal mines

Ghasemi

Ataei

Shahriar

et al. 2012

International Journal of Rock Mechanics and Mining Sciences

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Sensitivity analysis of support safety factor for predicting the effects of contributing parameters on roof falls in underground coal mines

Cited by 55 publications

References 3 publications

Development an instability model for bord-and-pillar goaf using elastic foundation plate theory

Development an instability model for bord-and-pillar goaf using elastic foundation plate theory

An Integrated Approach for the Prediction of Underground-Induced Strata Movement over Longwall Coal Mining Panels

Assessment of roof fall risk during retreat mining in room and pillar coal mines

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