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EXPERIMENTAL RESEARCH AND NUMERICAL SIMULATION OF ACOUSTIC EMISSION OF MEMORY EFFECT OF ROCK STRESS UNDER POINT LOAD
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Abstract Theoretical expression of memory effect of previous stress under point load is established based on damage mechanics of Kaiser effect in uniaxial compression. Fourteen specimens with different parameters of mechanical properties and different ratios of height to width are given to simulate memorizing ability of previous stresses in rock specimens under point load using software of RFPA2D(rock failure process analysis). The results show that the value of point load on specimens increases with the increase of previous stresses in rock specimens when acoustic emission occurs. In order to further verify the results obtained from numerical simulation，acoustic emission experiments of 5 specimens under loading and unloading of uniaxial compression and point loading are conducted. The experimental results agree well with those of numerical simulation. It provides a new method for the estimation and assessment of in-situ stress.
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Received: 28 November 2007
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WANG Hongjian1, 2, 3, 4, YIN Bohao1, WANG Yongbo1, XU Xianlei4, ZHAO Shankun3*, ZHAO Fei1,SHI Xiaoshan2, WANG Guozhu5. Fluid-solid coupling mechanisms in the evolution of hydraulic fracture networks in large-scale true triaxial tight sandstone[J]. , 2026, 45(6): 1723-1739. |
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