Experimental study on in-situ stress measurement from marble using acoustic emission method

On-site stress relief tests were performed to measure the in-situ stress by the technology of acoustic emission Kaiser effect. The measured stress value of the specimen loading direction was obtained. The acoustic emission test with secondary loading on the marble under the condition of uniaxial compression determines the Kaiser point. The experimental results show that the deviation between the geostress measured by acoustic emission Kaiser effect method and the raw rock stress measured by Sleeve stress relief method is lower than 10 %. The stress of the original rock is between 20 % and 26 % of the peak intensity, ie, the later stage of the rock compression stage or the initial stage of the elastic phase. The results provide favorable basis for improving the accuracy of the interpretation of Kaiser points and the actual engineering of rock engineering