Abstract
A study of multiple seams longwall mining is proposed to investigate its applicability in Indonesia coal mine. The study area of this research is PT Gerbang Daya Mandiri (GDM) coal mine located in East Kalimantan Island. The study of seam interaction is crucial for developing multiple seams longwall mining especially when it comes to weak rock conditions which are usually found in most of the coal reserves in Indonesia. This paper will use numerical simulation to investigate the effect of the first mined-out seam on the development of the second coal seam gate-entry by considering a couple of key parameters including depth of the coal seam and interburden length. The simulation model consists of two main indicators for instability which include failure zone, the contour of safety factor. The results show that the effect of seam interaction on gate-entry has different intensity based on the thickness of the interburden and coal seam depth. This work also provided appropriate support configuration for maintaining the stability of gate-entry.
Highlights
Indonesia is among one of the biggest coal export countries in the world because of the huge amount of coal resource available in the country
Seam interaction in multiple seam longwall development can be described in the form of influence on the stability of the first mined-out seam to the current development seam
Plasticity model in FLAC3D, failure has occurred when stress satisfies yield strength criterion in which failure mechanism can arise in shear failure and tensile failure (Itasca_Consulting_Group, 2012; Zarlin et al, 2012)
Summary
Indonesia is among one of the biggest coal export countries in the world because of the huge amount of coal resource available in the country. The first mined-out seam induces strata movement which led to the redistribution of stress surrounding the mined area (Guo et al, 2012; Suchowerska et al, 2013) This will affect the development of the second seam through the influence of seam interaction from the first mined-out seam. Undermining sequence is the most common practice for developing new multiple seam mining as the majority of the strata movement and other geotechnical concerts happen above the mined-out area (Ghabraie, 2016; Zipf, 2005). For this reason, undermining is adopted for this research. Vol 9, No 1; 2020 two main key factors of seam interaction including the depth of the coal seam and the interburden thickness
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