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Final extraction in underground coal mining is associated with hazards and risks of accidents relating to fall of roof and sides due to in equal strata movement in active mining zone. Strata movement exhibits dynamism on loading effect during Bord and Pillar extraction in proportion to increase in goaf span and area leading to formation of dynamic loading zone and effect within working areas including at goaf-edges. The loading effect generally happens to be maximum near the goaf-edges with diminishing effect farther in the dynamic loading zone requiring advance support in depillaring panels. Any presence of geological disturbances or weak zones in the working area may attract release of such mining induced stress, further leading to collapses or un-eventualities. State of strong overlying rock formations may even lead to sluggish caving characteristics, enlarging dynamic loading zone with erratic strata behavior. Release of stress can be controlled by proper apprehension of strata movements including delineating, dynamic loading zone with effect and subsequent preventive measures. Strata control instrumentation and monitoring with proper analysis has emerged as a leading global solution for apprehension of strata movement during final extractions. The study deals with preliminary analysis of strata control monitoring in an Indian underground coal mine, Churcha underground mine of SECL, Coal India Limited. Depillaring in the mine is associated with constrains/difficulties such as high depth of cover, hill cap cover, geological disparities and very hard overlying rock formations. The basic objective of the study is to apprehend strata movements so that subsequent preventive measures can be initiated against any un-eventualities relating to roof and sides Keywords—underground coal mine, bord and pillar, goaf span, dynamic loading, depillaring, strata control, roof fall, caving, instrumentation.

Analysis of strata controll monitoring in rground coal mine for apprehension of strata movement.