Problems Of Waste Dump Instability On Bukit Asam Colliery, South Sumatera - Indonesia

Toha , Taufik and Bochori, Bochori (2008) Problems Of Waste Dump Instability On Bukit Asam Colliery, South Sumatera - Indonesia. In: 5th International Conference on Landslides, Slope Stability & The Safety of Infra-Structures 24-26 July 2008, Kuala Lumpur, Malaysia, 24 - 26 July 2008, Kuala Lumpur.

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    Abstract

    Bukit Asam Colliery was located on Muara Enim District South Sumatera Province Indonesia. Mining method being applied is open pit with continuous mining using Bucket Wheel Excavator as main equipment. Mine area approximately 500 km2, with stripping ratio 1 : 3 and dumping area 650 km2 that can handle overburden up to 300 million BCM. Dumping system being applied are using spreader and shovel-dump truck system. Waste dump instability problems usually caused by morphology of dump base that basin form that parallel to the slope (unfavorable slope), mechanical characteristics of dumped material which relative low, dumped material bedding plane, as well as high rain fall. Besides, dumping techniques being applied that without initial preparation of bed rock. On the western part of the west dum, initial dumping were done by using shovel – dump truck, material being dumped were clay (low mechanical characteristics) and the dumping techniques relatively bad (without stripping of topsoil on the bed rock), without drainage system on the dump base, and without butter and less compacting). When dumped by spreader, soil movement was occured and performed some cracks. Due to the problems, to plan final slope for optimize dump capacit, slope stability analysis should be performed. Analysis were initialized by geotechnical investigation ( drilling 6 geotechnical boreholes) and hydro-geological investigation and also slope monitoring, then slope redesign was performed. Analysis concluded that dump capacity can be improved with safe slope dimension. Result of analysis show factor of safety > 1.5 for all observed cross section. Number of benches that still can be added is 4 benches with 6 m height, slope of 1 : 3 and berm 40 m eac.

    Item Type: Conference or Workshop Item (Paper)
    Uncontrolled Keywords: Waste Dump, Slope Instability Analysis, Unfavorable Slope
    Subjects: T Technology > TN Mining engineering. Metallurgy
    Divisions: Faculty of Engineering > Department of Mining Engineering
    Depositing User: Hairul Anwar
    Date Deposited: 20 Aug 2013 14:28
    Last Modified: 23 Aug 2013 09:48
    URI: http://eprints.unsri.ac.id/id/eprint/2519

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