2018_EJRNL_PP_LOKHANDE_1.pdf
Terbatas Resti Andriani
» ITB
Terbatas Resti Andriani
» ITB
Pot-hole subsidence can be induced by extracting underground coal seam at shallow depth and is a matter
of great concern. This has been the case in some of the
coal mines of South Eastern Coalfields Limited, a subsidiary of Coal India Limited. Many of the old underground coal mines developed by bord and pillar
method of mining lying at shallow depth are posing
stability concerns to the habitat due to pillar collapse
and gallery widening under the creep loading and
weathering. This requires a systematic study for developing an in-depth analysis on various parameters
which influence pot-hole occurrence and also for formulating suitable predictive models. A study was conducted to analyse the pot-hole subsidence data related
to 34 pot-hole cases and develop a semi-empirical
model for simulating pot-hole depth. This study was
carried out in some of the Indian coal mines during
different stages of coal extraction, i.e. development
and depillaring. Data analysis indicates that height
and width of extraction, thickness of soil and rock
layers, weighted density and compressive strength are
key contributing parameters for the occurrence of
pot-hole subsidence. The predicted results match with
the actual pot-hole depth measured in the field, validating the model.