Numerical modelling based feasibility study for extraction of bord and pillar panels under a built-up area - A case study

Abstract

This paper describes the findings of a numerical modelling based case study to assess the feasibility for extraction of pillars with controlled subsidence of the surface in Mahuda Top seam III at Murlidih Bord and pillar mine under Jharia coalfield India. Controlled subsidence on the surface was required to avoid any adverse impact of mining induced subsidence on built-up area at the surface structures. Two dimensional numerical modelling has been done to quantify the various parameters associated with mining induced subsidence. The stability of barrier pillar has also been evaluated to confirm the validity of controlled extraction width for limiting damage on the surface. Based on findings of the study, the feasibility of extraction of the proposed panels has been assessed. The results of the study have been very helpful in planning the layout of Bord and Pillar mining panels to meet the site specific objecttives with higher recovery of coal from the underground workings. © BeFo and ISRM, 2012.