Slope stability assessment approach for multiple seams Highwall Mining extractions

Porathur, John Loui; Srikrishnan, Siva Subramanian; Verma, C.P.; Jhanwar, J.C.; Roy, P. Pal

doi:10.1016/j.ijrmms.2014.04.023

Cited by 17 publications

(12 citation statements)

References 3 publications

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“…Recently, the problems in mining CCSs have gradually attracted many researchers in the mining industry. However, most relevant studies of mining CCSs still depend on empirically qualitative judgments (Khare et al., 2006; Porathur et al., 2014). Theoretically quantitative calculation and practical engineering detection of the FFD of UCS during CCSs mining are still lacking.…”

Section: Introductionmentioning

confidence: 99%

Floor failure depth of upper coal seam during close coal seams mining and its novel detection method

Zhang

et al. 2017

Energy Exploration & Exploitation

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The primary problem needed to be solved in mining close coal seams is to understand quantitatively the floor failure depth of the upper coal seam. In this study, according to the mining and geological conditions of close coal seams (#10 and #11 coal seams) in the Second Mining Zone of Caocun Coal Mine, the mechanical model of floor failure of the upper coal seam was built. Calculation results show that the advanced abutment pressure caused by the mining of the upper coal seam, resulted in the floor failure depth with a maximum of 26.1 m, which is 2.8 times of the distance between two coal seams. On this basis, the mechanical model of the remaining protective coal pillar was established and the stress distribution status under the remaining protective coal pillar in the 10# coal seam was then theoretically analysed. Analysis results show that stress distribution under the remaining protective coal pillar was significantly heterogeneous. It was also determined that the interior staggering distance should be at least 4.6 m to arrange the gateways of the #209 island coalface in the lower coal seam. Taken into account a certain safety coefficient (1.6-1.7), as well as reducing the loss of coal resources, the reasonable interior staggering distance was finally determined as 7.5 m. Finally, a novel method using radon was initially proposed to detect the floor failure depth of the upper coal seam in mining close coal seams, which could overcome deficiencies of current research methods.

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Section: Introductionmentioning

confidence: 99%

Floor failure depth of upper coal seam during close coal seams mining and its novel detection method

Zhang

et al. 2017

Energy Exploration & Exploitation

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“…Through the FLAC3D software, Porathur et al (2014) and researched the slope stability under the conditions of different pillar widths and different adit widths in highwall mining of open-pit coal mines. Mo et al (2018) quantitatively studied the influence of backfilling on rib pillar strength in highwall mining by using the FLAC2D software.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Rib Pillars in Highwall Mining Under Dynamic and Static Loads in Open-Pit Coal Mine

Chen

et al. 2021

Preprint

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The highwall miner can be used to mine the retained coal in the end slope of an open-pit mine. However, the instability mechanism of the reserved rib pillar under dynamic and static loads is not clear, which restricts the safe and efficient application of the highwall mining system. In this study, the load-bearing model of the rib pillar in highwall mining was established, the cusp catastrophe theory and the safety coefficient of the rib pillar were considered, and the criterion equations of the rib pillar stability were proposed. Based on the limit equilibrium theory, the limit stress of the rib pillar was analyzed, and the calculation equations of plastic zone width of the rib pillar in highwall mining were obtained. Based on the Winkler foundation beam theory, the elastic foundation beam model composed of the rib pillar and roof under the highwall mining was established, and the calculation equations for the compression of the rib pillar under dynamic and static loads were developed. The results show that with the increase of the rib pillar width, the total compression of the rib pillar under dynamic and static loads approximately decreases in an inverse function, and the compression of the rib pillar caused by static loads of the overlying strata and trucks has a decisive role. Numerical simulation and theoretical calculation were performed in this study. In the Numerical simulation, the coal seam with a buried depth of 122 m and a thickness of 3 m was mined by the highwall miner. According to the established rib pillar instability model of the highwall mining system, it is found that when the mining tunnel width is 3 m, the reasonable width of the rib pillar is at least 1.3 m, and the safety factor of the rib pillar is 1.3. The numerical simulation results are in good agreement with the results of theoretical calculation, which verifies the feasibility of the theoretical analysis of the rib pillar stability. The research results can provide an important reference for the stability analysis of rib pillars under highwall mining.

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“…With this method, the main haulage and ventilation roadways are designed and excavated from the exposed position of the coal seam in the end-walls. For the irregular and small area of an end-wall residual resource, the costs remain high [12][13][14]. Thus, it is difficult to exploit small-area residual coal resources with conventional techniques, but remote control technology can be a good solution to this problem [15,16].…”

Section: Introductionmentioning

confidence: 99%

Reasonable coal pillar design and remote control mining technology for highwall residual coal resources

Wang¹,

Chen

2019

R. Soc. open sci.

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Highwall mining (HWM) technology is an efficient method for exploiting residual coal resources in Chinese open-pit coal mines. However, on-site personnel and equipment can be damaged by the instability of the highwall mining residual coal pillars and subsidence of final end-walls. This paper considers the geological conditions of an open-pit mine in Shendong Coal Field (China) in order to prevent overlying rock fall accidents; the Mark-Bieniawski formula and the FLAC3D numerical simulation are used to analyse reasonable coal pillar widths outside and under the road, which were determined to be 1.7 m and 1.3 m, respectively. Using the EBH132 cantilever excavator for remote control mining, the field experiment shows that the recovery ratio of highwall residual coal resources was over 67%; hence, safety, efficiency and high recovery ratio of highwall mining were achieved for the residual coal resources of an open-pit mine.

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Slope stability assessment approach for multiple seams Highwall Mining extractions

Cited by 17 publications

References 3 publications

Floor failure depth of upper coal seam during close coal seams mining and its novel detection method

Floor failure depth of upper coal seam during close coal seams mining and its novel detection method

Stability Analysis of Rib Pillars in Highwall Mining Under Dynamic and Static Loads in Open-Pit Coal Mine

Reasonable coal pillar design and remote control mining technology for highwall residual coal resources

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