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Underground Coal Gasification, with enhanced knowledge of hydrogeological,\udgeomechanical and environmental aspects, can be an alternative technique to\udexploit the existing unmineable reserves of coal. During the gasification\udprocess, petro-physical and geomechanical properties undergo a drastic\udchange due to heating to elevated temperatures. These changes, caused due to\udthe thermal anisotropy of various minerals, result in the generation of\udthermal stresses; thereby developing new fracture pattern. These fractures\udcause the overhead rock strata to cave and fill the gasification chamber\udthereby causing subsidence. The degree of subsidence, change in fluid\udtransport and geomechanical properties of the rock strata, in and around the\udsubsidence zone, can affect the groundwater flow. This study aims to predict\udthe thermo-geomechanical response of the strata during UCG. Petro-physical\udand geomechanical properties are incorporated in the numerical modelling\udsoftware COMSOL Multiphysics and an analytical strength model is developed\udto validate and further study the mechanical response and heat conduction of\udthe host rock around the gasification chamber. Once the problems are\udinvestigated and solved, the enhanced efficiency and the economic\udexploitation of gasification process would help meet country's energy\uddemand

Numerical and experimental study of strata behavior and land subsidence in an underground coal gasification project