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ORIGINAL PAPER

Experimental Study on Uniaxial Mechanical Properties of Granite Under Thermo-liquid Coupling Li Yu1

•

Minghui Yan2 • Yanping Chen2 • Haiwang Peng2

Received: 2 January 2020 / Accepted: 30 March 2020 Ó Indian Geotechnical Society 2020

Abstract In order to study the uniaxial mechanical properties and failure modes of granite under the condition of thermo-liquid coupling, the granite was subjected to thermo-liquid coupling cyclic treatment at different temperatures, and then its mechanical properties were analyzed by uniaxial compression test. The results reflect the following trends: (1) the stress–strain curve generally undergoes four stages, namely compaction, elastic deformation, yielding, and failure. (2) The peak intensity increases with temperature, decreasing by 11.51% when the temperature is in the range of 50–100 °C and decreasing by 1.77% when the temperature is in the range of 100–150 °C. The peak strain is fit by a linear relationship with the cycle temperature and decreases as the temperature increases. The modulus of elasticity first increases and then decreases with increasing temperature, increasing significantly by approximately 123.21%. (3) The peak intensity varies with the number of cycles and changes slowly before three cycles but changes obviously after three times. The peak intensity is reduced by 19.87% when the number of cycles is 3–4, and it is increased by 22.70% when the number of cycles is 4–5. The peak strain has a cubic fitting relationship with the number of cycles, and it is maximized at three cycles. The modulus of elasticity has a quadratic fit with the number of cycles, and it is minimized at three cycles. (4) In the contour map, the peak intensity is symmetrically distributed in three cycles when the temperature range is 50–100 °C.

& Li Yu [email protected] 1

Hebei University, Baoding 071002, China

2

Hebei University, Baoding 071002, China

Keywords Thermo-liquid coupling  Mechanical properties  Correlation analysis  Granite

Introduction Studying the mechanical properties of various states and conditions of rock is one of the key topics in the field of rock engineering. The development and utilization of hot dry rock energy, the development of underground space in smart cities, the development of tunnels, etc., all involve rock engineering and are usually closely related to natural conditions such as temperature and groundwater. Therefore, domestic and foreign scholars have performed considerable research on the temperature cycle effect and dry–wet cycle effect of rock [1–12]. Xi and Zhao [13] studied the mechanical properties of granite at 600 °C in a high-temperature state and after cooling with water. It is concluded that the ultrasonic velocity, uniaxial compressive strength, tensile strength and elastic modulus decrease with temperature. Huang et al. [14, 15] performed uniaxial compression tests and acoustic wave tests on marble and limestone in a high-temperature state and after water cooling and natural cooling and analyzed and compared the peak in