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Fractal characteristics of fracture surface of triaxial compression rock after high temperature

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Abstract: Under triaxial compression conditions of different temperatures (25 ~ 1000 ℃) and confining pressure (0 ~ 40 ℃), 30 fractured granites were tested by s250mk Ⅲ scanning electron microscope (SEM) (MPA). The results show that: (1) the variation of rock fracture fractal dimension with temperature is closely related to confining pressure, which can be divided into two categories. In the first type, when the confining pressure is 0 ~ 30   MPa, FD fits the cubic polynomial curve with temperature, and reaches the maximum at 600 ℃. In the second category, when the confining pressure is   MPa at 30 ~ 40 ℃, FD fluctuates with temperature. () the FD of rock fracture varies with confining pressure and is also closely related to temperature, which can be divided into three categories:s. In the first category, FD has volatility with confining pressure at 25°C, 400°C, and 800°C. In the second category, it increases exponentially at 200°C and 1000°C. In the third category, it decreases exponentially at 600°C. () It is found that 600°C is the critical temperature and 30 MPa is the critical confining pressure of granite. The rock transfers from brittle to plastic phase transition when temperature exceeds 600°C and confining pressure exceeds 30 MPa.

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