Design of rhombus coal pillars and support for Roadway Stability and mechanizing loading of face coal using SDLs in a st
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ORIGINAL PAPER
Design of rhombus coal pillars and support for Roadway Stability and mechanizing loading of face coal using SDLs in a steeply inclined thin coal seam—a technical feasibility study Mohammad Jawed 1 & Rabindra Kumar Sinha 1 Received: 14 August 2017 / Accepted: 19 July 2018 # Saudi Society for Geosciences 2018
Abstract Coal seams that dip more than 15° are classified as steeply inclined in Indian mining context. Mining of steeply inclined seams poses variety of problems starting from strata control to problems related to efficient mechanisation. Sawang-C seam of Govindpur Underground Project of Central Coalfields Limited is one such seam. Presently, the seam is being developed on bord and pillar method of mining, and the blasted coal is loaded manually into tubs using hand shovel and basket. In order to mechanise the loading operation, technical feasibility of formation of rhombus pillars and deployment of side discharge loader (SDL) are investigated along with design of supports from the point of view of roadway stability. This paper thus seeks to address the technical feasibility of deployment of Side Discharge Loader in a 1.7–2.2-m thin seam inclined at 16° if developed with rhombus pillars and to suggest suitable and adequate support system for such workings. Keywords Bord and pillar mining . Steeply inclined seams . Rhombus pillars . Thin seams . Numerical modelling
Introduction Development of inclined/steeply inclined seams with formation of square or rectangular pillars pose difficulties in movement of loading and hauling machinery on account of seam gradient. Development of rectangular pillars is prescribed by Regulation 111(3) of The Coal Mines Regulations, 2017 for improved stability of pillars. Rhombus pillars and pillars with diagonally opposite obtuse angle are considered suitable for easy manoeuvrability of loading and transport machinery such as SDLs. Inclined seams invariably face strata control problems. The component of strata weight in dip direction increases whereas the component normal to bedding plane reduces which makes the roof unstable leading to shear failure. Mechanising either of cutting or loading and transport operation with tyre mounted or crawler mounted machinery is not feasible in bord and pillar mining if the seam gradient is steeper than 1 in 4. Mechanising loading operation using SDL
* Rabindra Kumar Sinha [email protected] 1
Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India
in bord and pillar mining with rhombus pillars can be one option, provided favourable gradient and working height are there.
Govindpur underground project Govindpur underground project lies between the latitude 23°46′23″N to 23°48′23″N and longitude 85°51′41 E to 85°53′39″ E in the East Bokaro Coalfields situated in Giridih District of Jharkhand State, India. Govindpur Project is surrounded by Sawang Colliery on the West and Kathara Colliery on the South. Konar River, of which Bokaro River is a tributary, makes its boundary on the South-west sid
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