Abstract

In-situ stress measurement using AE (Acoustic Emission) and DRA (Deformation Rate Analysis) is usually carried outunder uniaxial loading in the laboratory and it consumes delay considered how the lateral stress and delay time influence on t he test results for the in-situ stress determination. As thedelay time increased, the accuracy of estimating the pre-stress decreased. The pre-stress of the specimen loaded onlyE) and 4% (using DRA). And the specimen on which axialpre-stress and the confining pressure were loaded had an error of less than 17% (using AE) and 14% (using DRA). Theresults of AE and DRA for field specimens were very similar wit fracturing method.