Luo, X 2008, 'Passive Seismic Monitoring of Thermal Cracking Induced by Underground Firing', in Y Potvin, J Carter, A Dyskin & R Jeffrey (eds), SHIRMS 2008: Proceedings of the First Southern Hemisphere International Rock Mechanics Symposium, Australian Centre for Geomechanics, Perth, pp. 709-714, https://doi.org/10.36487/ACG_repo/808_97
(https://papers.acg.uwa.edu.au/p/808_97_Luo/)
Abstract: Understanding of the progress of rock fracturing and weakening induced by thermal stressing is important for many applications in underground mining and civil engineering. There has been a lack of techniques to measure rock thermal fracturing in situ and in a large area. This paper presents results from microseismic monitoring of rock thermal fracturing carried out in an underground coal gasification experiment. During the experiment, several types of seismic events, associated with thermal fracturing and roof caving, were detected. The thermal events showed a higher frequency range compared to the other events and their locations change with the progress of firing. Numerical modelling results showed a strong concentration of thermal and geomechanical stress near the burn front, which breaks the rocks in the roof and floor of the firing coal seam.