Experimental and theoretical analysis on the procedure for estimating geo-stresses by the Kaiser effect |
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Authors: | Yuan-hui Li Yu-jiang Yang Jian-po Liu Xing-dong Zhao |
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Institution: | (1) Department of Geological Engineering, Hacettepe University, Beytepe, 06800 Ankara, Turkey;(2) Department of Civil and Environmental Engineering, Kumamoto University, Kumamoto, Japan |
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Abstract: | Acoustic emission tests of the core specimens retrieved from boreholes at the depth over 1000 m in Hongtoushan Copper Mine
were carried out under uniaxial compressive loading, and the numerical test was also done by using the rock failure process
analysis (RFPA2D) code, based on the procedure for estimating geo-stresses by the Kaiser effect under uniaxial compression. According to the
statistical damage mechanics theory, the Kaiser effect mechanism was analyzed. Based on these analyses, it is indicted that
the traditional method of estimating geo-stresses by the Kaiser effect is not appropriate, and the result is usually smaller
than the real one. Furthermore, the greater confining compression in the rock mass may result in a larger difference between
the Kaiser effect stresses acquired from uniaxial loading in laboratory and the real in-situ stresses. |
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Keywords: | |
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