Assessment of mining induced stress development over coal pillars during depillaring

Singh, Ajoy Kumar; Singh, Rajendra; Maiti, J.; Kumar, Rakesh; Mandal, Prabhat Kumar

doi:10.1016/j.ijrmms.2011.04.004

Cited by 133 publications

(39 citation statements)

References 20 publications

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“…The PAT assumes that an arch will form above the coal seam carrying most of the overburden weights, the coal seam near arch springing will carry PA and the pillars below the arch will carry PC; while TAT assumes that the overburden load is evenly distributed among the pillars, thus, each pillar will carry PT if the rooms are formed (Figure 4a,b), but it may overestimate the stress on the coal pillars [13,18]. At first, the strata properties were not considered in the load calculation, Heasley [19,20], Singh et al [21] and Rezaei et al [22] modified the theory and included the mechanical properties of overburden and coal seams, thus improving the accuracy of pillar stress estimation.…”

Section: Pillar Loadmentioning

confidence: 99%

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Chen

Deng

et al. 2018

Sustainability

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Abstract:Partial extraction methods such as underground strip pillar mining or room-and-pillar mining are widely adopted techniques to control ground subsidence. However, pillar failure in partial extraction mines may introduce violent secondary ground collapses. The stability of partial extraction mines dictates the safety of ground surface structures and the environmental health state of the surrounding mining areas. To reuse mining subsidence lands, it is necessary to evaluate the stability of the land through mine subsidence assessments. This paper summarizes current pillar stability assessment methods and their limitations, and the rock mechanics associated with the stability of abandoned mines. The effects of multiple factors that affect mine stability are discussed in detail; special attention has been extended to discuss the weathering effects associated with infused water and spontaneous combustion, as these are some key reasons for pillar strength degradation in abandoned mines. The mechanism of mine collapse and the corresponding post-mining disasters are also summarized. Finally, suggestions and strategies to improve current mine stability assessment methods are proposed based on the perspective of subsidence control.

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Section: Pillar Loadmentioning

confidence: 99%

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Chen

Deng

et al. 2018

Sustainability

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“…Investigations [14][15][16] showed that the front abutment pressure changes with the advancing coal face. The vertical stress component is named after abutment pressure [17].…”

Section: Mechanical Rationalementioning

confidence: 99%

Front abutment pressure concentration forecast by monitoring cable-forces in the roof

Tan

Liu

Ning

et al. 2015

International Journal of Rock Mechanics and Mining Sciences

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“…However, in case proper geologic controls are not in place, there is a fear of subsidence. Thus, it is imperative to predict the amount of displacement faced by the rock strata [5]. Modeling can easily indicate the amount of physical displacement of the strata but it may not be useful in defining the geo-engineering characteristics of the rocks.…”

Section: Introductionmentioning

confidence: 99%

Geological and Rock Mechanics Perspectives for Underground Coal Gasification in India

Singh

2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. The geological resources of coal in India are more than 308 billion tonnes upto a depth of 1200 m, out of which proved reserve has been reported at around 130 billion tonnes. There is an increasing requirement to increase the energy extraction efficiency from coal as the developmental prospects of India increase. Underground coal gasification (UCG) is a potential mechanism which may be utilized for extraction of deep-seated coal reserves. Some previous studies suggest that lignites from Gujarat and Rajasthan, along with tertiary coals from northeastern India can be useful from the point of view of UCG. We discuss some geological literature available for these areas. Coming to the rock mechanics perspectives, during UCG the rock temperature is considerable high. At this temperature, most empirical models of rock mechanics may not be applied. In this situation, the challenges for numerical modelling of UCG sites increases manifold. We discuss some of the important modelling geomechanical issues related to UCG in India.

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Assessment of mining induced stress development over coal pillars during depillaring

Cited by 133 publications

References 20 publications

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Subsidence Mechanism and Stability Assessment Methods for Partial Extraction Mines for Sustainable Development of Mining Cities—A Review

Front abutment pressure concentration forecast by monitoring cable-forces in the roof

Geological and Rock Mechanics Perspectives for Underground Coal Gasification in India

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