Web pillar design approach for Highwall Mining extraction

Porathur, John Loui; Karekal, Shivakumar; Palroy, P.

doi:10.1016/j.ijrmms.2013.08.029

Cited by 19 publications

(14 citation statements)

References 5 publications

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“…Chekan et al (1988) found that the ratio of the overburden to interburden thickness is a key factor influencing load transfer. Later, multiple seam interactions associated with longwall mining or interactions between room-and-pillar and longwall panels were investigated with a focus on their complex multiple-seam stress and displacement interactions (Chekan et al 1989;Heasley and Akinkugbe 2005;Porathur et al 2013). Results demonstrated that during multiple-seam excavations, it is important to protect the overlying workable seams and minimize surface subsidence.…”

Section: Introductionmentioning

confidence: 99%

Interactions of overburden failure zones due to multiple-seam mining using longwall caving

Sui

Yuan

et al. 2014

Bull Eng Geol Environ

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This paper presents an investigation on the interactions of overburden failure zones induced by the mining of adjacent coal seams using the longwall caving method. Overburden failure is an important factor in safety assessments in the fields of mining engineering geology and safety geology, especially when mining under water bodies. In this study, the influence of the thickness and properties of the interburden between seams on the development and interactions of caving and fractured water flow zones are investigated by using in situ measurements, scale model testing and numerical simulations. The height of the fractured water flow zones in the scale model tests and numerical simulations are basically in good agreement with measurements after mining of the upper and lower seams of Seam No. 3 in the Cuizhuang Coalmine. Therefore, the scale tests and numerical simulations in the study are verified. The results show that interaction and superposition between two close distance seams cannot be ignored when the ratio (h/M) of the interburden thickness (h) to the cutting height of the lower seam (M) is less than a defined critical value. A dividing line, Line D, has been proposed to judge whether the interactions exist. When the (M, h/M) points are located above Line D, the caving zone induced by excavation of the lower seam will not propagate to the caving zone induced by the upper seam. Otherwise, for the (M, h/M) points below Line D, the interactions and superposition of the overburden failure must be considered when predicting the heights of the caving and fractured water flow zones.

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Section: Introductionmentioning

confidence: 99%

Interactions of overburden failure zones due to multiple-seam mining using longwall caving

Sui

Yuan

et al. 2014

Bull Eng Geol Environ

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“…The overburden depth may be taken as the maximum overburden depth on a highwall mining web pillar, which is notably conservative, or as a high average value as follows [25]:DDesign=0.75×DMax+0.25×DMin,where D Max is the maximum overburden depth, m; D Min is the minimum overburden depth, m.…”

Section: Reasonable Coal Pillar Design To Prevent Rock Fall Accidentsmentioning

confidence: 99%

“…Perry et al [24] studied the effect of the highwall mining progression on the web and barrier pillar stability. Using numerical modelling tools, a correction factor was suggested in the empirical pillar strength equation for slender pillars with width-to-height ratios less than unity [25]. However, current studies rarely consider the effect of the roads on the highwall and pillar design.…”

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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“…"Highwall mining" is practised when the open-pit coal mines reach their pit limits due to the presence of surface dwellings or uneconomical stripping ratios. It involves driving a series of parallel entries separated by rib pillars using a remotely operated continuous miner into a coal seam exposed at the highwall [7]. For shovel-truck mining technology system, transport lines of trucks are usually arranged in the highwalls, so the slope angle of highwalls will be designed to be very low.…”

Section: Introductionmentioning

confidence: 99%

Theoretical Analysis of Damaged Width & Instability Mechanism of Rib Pillar in Open‐Pit Highwall Mining

Wang

Yan

Bai

et al. 2019

Advances in Civil Engineering

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To improve the resources’ recovery ratio and the economic benefits of open-pit mines, the development of highwall mining is used to exploit residual coal. The design of rib pillar, formed by excavation and mining activities in intact coal seams, is crucial to the overall stability and safety of the highwall mining operations. This paper focuses on the damage caused to rib pillars by the large deformation, occurring with the application of highwall mining in an open-pit in China. A mechanical model was established to investigate the damaged width of colinear rib pillars based on Hoek–Brown and Mohr–Coulomb failure criterion. The equations for calculating the damaged width of the rib pillar were obtained, respectively, by combining the Hoek–Brown failure criterion with the Mohr–Coulomb failure criterion. The failure mechanism for the width of the rib pillar and the factors affecting the colinear rib pillar were analyzed in detail. The results show that the application of the Hoek–Brown criterion has a unique advantage in analyzing the damaged width of the colinear rib pillars, in open-pit highwall mining. The instability mechanism and failure process of the rib pillars are described in combination with the limiting equilibrium method and the ratio of the elastic zone’s width to the width of the entire rib pillar.

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Web pillar design approach for Highwall Mining extraction

Cited by 19 publications

References 5 publications

Interactions of overburden failure zones due to multiple-seam mining using longwall caving

Interactions of overburden failure zones due to multiple-seam mining using longwall caving

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

Theoretical Analysis of Damaged Width & Instability Mechanism of Rib Pillar in Open‐Pit Highwall Mining

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