Analysis of chock shield pressure using finite element method and face stability index

Verma, Abhay Kumar; Deb, D.

doi:10.1179/174328607x191056

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…The height of extraction of coal is kept 2.4 m for all models. The details regarding modeling procedures can be followed from the works of Kelly et al (2002), Yavuz (2004), Verma and Deb (2007), GonzalezNicieza et al (2008), Alehossein and Poulsen (2009), Trueman et al (2009), Singh and Singh (2010.…”

Section: Finite Element Modeling Of Longwall Panelmentioning

confidence: 99%

“…As the coal face advances, main roof cantilever grows behind the PS and causes loading on the face and hydraulic legs. A periodic weighting occurs when main roof layer(s) break(s) in front of the coal face and the dead weight of main roof rests on the PS (Verma and Deb 2007). Rock layers, coal seam and shield structure except hydraulic leg and lamniscate links are modeled with 6-noded quadratic triangular elements.…”

Section: Finite Element Modeling Of Longwall Panelmentioning

confidence: 99%

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Longwall Face Stability Index for Estimation of Chock-Shield Pressure and Face Convergence

Verma

Deb

2010

Geotech Geol Eng

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The paper discusses the concept and methodologies for the development of longwall face stability index (LFSI). LFSI is used for estimation of chock-shield pressure and face convergence. The index comprises of engineering properties of main roof, depth of mining, different support capacities and mechanical properties of coal seam being mined and provides a numerical value in the range of -6.17 to 8.13. In this study, 324 finite element models of longwall panel are developed based on various combinations of geomining conditions of Indian coal measure strata. The LFSI is an outcome of the results from finite element models. This paper illustrates a real life example for the estimation of chock shield pressure and face convergence based on LFSI. Validation of the LFSI based calculation is carried out with the field monitored data and found that the LFSI based approach is sufficient to forecast face stability parameters at longwall face.

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Section: Finite Element Modeling Of Longwall Panelmentioning

confidence: 99%

Section: Finite Element Modeling Of Longwall Panelmentioning

confidence: 99%

Longwall Face Stability Index for Estimation of Chock-Shield Pressure and Face Convergence

Verma

Deb

2010

Geotech Geol Eng

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“…Data collected from the longwall system are used in the development of new methods to enhance the monitoring of the rock strata behaviour in the vicinity of the longwall site. Recalling the vast body of expertise reported in the works by [1,2,11,18,23,24,25,26,27], AGH researchers have now focused on the following aspects: -the potential to predict the deformations of longwall excavations. First results are summarised in the work by [15], presenting a new methodology to obtain the pressure increase factor ξ correlating the vertical convergence of a longwall face with the shield leg pressure increase profiles.…”

Section: Discussionmentioning

confidence: 99%

Powered Roof Support – Rock Strata Interactions on the Example of an Automated Coal Plough System

Herezy

Janik

Skrzypkowski

2018

Studia Geotechnica Et Mechanica

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The study summarises the operating characteristics of the powered roof support (shield) used in an automated plough system. Investigated longwall support units were controlled automatically or by section engineers and positioned in the ‘saw tooth’ configuration with respect to the longwall face (automatic mode) or linear to the face. Shield pressure data have been analysed in order to identify the impacts of particular factors on the pressure increase profiles. The analysis was supported by the Statistica software to determine the statistical significance of isolated factors. Equations governing the leg pressure at the given time instant were derived and the roof stability factor ‘g’ was obtained accordingly, recalling the maximal admissible roof displacement method recommended by the Central Mining Institute (Poland). In the current mining practice, its values are used in monitoring of strata behaviour as indicators of shield–strata interactions, particularly in the context of roof control in longwall mining. It is vital that the method used should be adapted to the actual conditions under which the longwall is operated. In the absence of such adaptations, there will be major discrepancies in results. The conclusions section summarises the current research problems addressed at the Department of Underground Mining, in which the support pressure data in longwall operations are used. The first aspect involves the delineation of deformations of a longwall main gate about 100 m ahead of the face. The second issue addressed involves the risk assessment of roof rock caving or rock sliding in the tail gate. Another aspect involves the standardisation of local conditions to support the methodology of interpreting shield–strata interactions in the context of work safety. These methods are being currently verified in situ.

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“…The longwall faces of SCCL in GDK-10A, JK-5 and VK-7 had produced good results. However, the faces in GDK-7, GDK-9, GDK-11A and PVK-5 of SCCL had suffered due to geological disturbances and unavailability of real-time information about the strata behaviour [3] [4]. The mine designers must know the initial state of stress to predict the potential block failures or larger areas of instability in underground workings [5].…”

Section: Introductionmentioning

confidence: 99%

Field and Numerical Modelling Investigations on the Stability of Underground Strata during Longwall Workings

Budi

Rao

Mohanty

2021

Preprint

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Understanding the behaviour of underground workings is essential for the success of any mining method. The longwall mining method is one of the predominant underground methods to extract coal. Since 1978, in India, 22 underground coal mines of different collieries have been implemented the mechanized longwall method. SCCL is one of that colliery has mixed working experiences with longwall method in their mines. The longwall faces in GDK-10A, JK-5, and VK-7 of SCCL had produced good results, but the faces in GDK-7, GDK-9, GDK-11A, and PVK-5 had suffered due to the geological disturbances and unavailability of real-time information about the strata behaviour. By addressing the previous experiences of longwall workings, Singareni Collieries Company Limited (SCCL) has implemented a high capacity (1 × 1152T) powered support system in Adriyala Longwall Project (ALP) at a depth of 375m. In this study, extensive field monitoring with different strata monitoring instruments was conducted in ALP to analyze the gate roads convergence, stress variation on longwall and chain pillars at different stages of extraction (i.e., 8m, 25m, 35m, and 45m) and the pressure variation on the powered support systems. It was observed from the results that the convergence in the gate roads was increasing with the advance of the longwall face and the area of exposure. The pressure of the legs on the dip side was less than the pressure of the legs on the rise side, which implies a stable roof condition over the longwall face. To better understand the behaviour of ALP workings, a numerical modelling study with FLAC 7.0 has been conducted with actual physio-mechanical properties. The computed numerical modelling results have been remarkably well in consistent with the field monitoring results. The stability of chain pillars has been estimated at every stage of extraction by the Factor of Safety (FoS) criterion and it was found that the pillars could be ensured stability in longwall workings.

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Analysis of chock shield pressure using finite element method and face stability index

Cited by 8 publications

References 3 publications

Longwall Face Stability Index for Estimation of Chock-Shield Pressure and Face Convergence

Longwall Face Stability Index for Estimation of Chock-Shield Pressure and Face Convergence

Powered Roof Support – Rock Strata Interactions on the Example of an Automated Coal Plough System

Field and Numerical Modelling Investigations on the Stability of Underground Strata during Longwall Workings

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