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Design of Snook in Depillaring Panel Using Continuous Miner

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Abstract

Different patterns of extraction of pillars during depillaring operation with continuous miner are adopted depending upon the geo-mining condition. Various sizes of snook are left during final extraction of coal in mechanized depillaring operation. The size of the snook plays a significant role in providing safe mining condition. Stability of the snook left during final extraction with continuous miner was analyzed using numerical modelling. A case study has been chosen for the simulation of the depillaring process with three scenarios of varying width of snook, i.e., 3.5, 4.5, and 5.5 m. The mine panel consists of 4 × 8 array of pillars having the width of 41 m center to center. Double split and fender method of mining is used with the straight line of extraction. Field investigation shows that the failure of immediate roof occurs after extraction of two or three fenders (i.e., about 40 m). The thickness of immediate roof was 2 m. A numerical model of a depillaring panel was simulated with three different sizes of snook, i.e., 3.5, 4.5, and 5.5 m in the study. An immediate roof of 2 m thickness was considered in the model. An interface has been introduced in between immediate and main roof. The immediate roof behaves as a cantilever during depillaring. It is concluded from the simulation of different size of snooks that snook width of 5.5 m shows reasonable residual strength to hold the immediate roof. Higher tensile stress was developed at the top of the immediate roof above the edge of the snook which leads the possible roof failure towards the goaf side. Vertical stress profile and yield profile in the panel at different stages of mechanized depillaring have also been plotted.

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Authors and Affiliations

  1. Department of Mining Engineering, IIT (BHU), Varanasi, India

    Shailendra Chawla, Ashok Jaiswal & B. K. Shrivastva

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  1. Shailendra Chawla
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  2. Ashok Jaiswal
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  3. B. K. Shrivastva
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Correspondence to Ashok Jaiswal.

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Chawla, S., Jaiswal, A. & Shrivastva, B.K. Design of Snook in Depillaring Panel Using Continuous Miner. J. Inst. Eng. India Ser. D 99, 39–49 (2018). https://doi.org/10.1007/s40033-017-0152-1

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  • DOI: https://doi.org/10.1007/s40033-017-0152-1

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