Abstract
Abstract In this study the possibility of acoustic emission (AE) technique was investigated to measure in situ rock stress using the Kaiser effect, which characterize AE increase in an increasing stress exceeds the previous stress. The rock cores were obtained from three different kinds of vertically drilled exploratory boreholes and one horizontally drilled borehole in an underground coal mine. The AE method was suggested to determine in situ rock stress with reasonable accuracy using AE signatures in repeated loadings of a rock core specimen. Based on the results of in situ stress estimation from the AE method, the time interval, up to 2 years, did not strongly influence the in situ stress determination using AE method. Cored rock recollected the in situ stress condition reasonably well (within+-10%), when compared to the results from over coring and hydraulic fracturing technique. Also, there was significant correlation between overburden pressure and estimated vertical stress from AE method.
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