Abstract
To investigate the energy evolution characteristics of sandstone under static‐quasi‐dynamic loading rates (1.0 × 10−3, 5.0 × 10−3, 1.0 × 10−2, 5.0 × 10−2, and 1.0 × 10−1 mm/s), the uniaxial compression tests, the uniaxial cyclic loading‐unloading tests, and the uniaxial incrementally cyclic loading‐unloading tests were conducted under five different loading rates. Through analysis of the elastic energy of the uniaxial cyclic loading‐unloading test and the uniaxial incremental cyclic loading‐unloading test, show that the impact of the loading rate and the cycle numbers on the elastic energy is less. Hence, we can deem that when the loads of the uniaxial incremental cyclic loading‐unloading test and the uniaxial compression test are equal, the elastic energy of the two also equals. The energy in the uniaxial compression tests analyzed by the uniaxial incrementally cyclic loading‐unloading test show that elastic energy increased linearly when the input energy increased under different loading rates. Through the linear energy storage law and the uniaxial incremental cyclic loading and unloading test, it is possible to analyze the energy in the uniaxial compression test at any loading rates. The results show that the greater the loading rate, the greater the peak elastic energy and peak input energy. But when the load is equal, the greater the loading rate, the smaller the input energy and elastic energy. Compared with traditional methods, the new energy analysis method is accurate and simple. Meanwhile, based on energy dissipation, the damage of rock during uniaxial compression tests was studied.
Highlights
Rock is a heterogeneous structure composed of solid phase, liquid phase, and gas phase. ere are many natural defects with random distribution
Using the uniaxial staged loading-unloading test combined with the linear energy storage law to analyze the energy evolution in the uniaxial compression tests. e study of the law of energy evolution in rock uniaxial compression tests under different loading rates is of positive significance to topics such as the energy mechanism of rock failure and rock bursts in mines
The stress-strain curve has a certain degree of discreteness, which restricts the accuracy of the engineering design. ermodynamics believes that energy conversion is the essential feature of the physical process, and the study of its energy features contributes to explore the nature of its destruction [15]. e elastic energy
Summary
Rock is a heterogeneous structure composed of solid phase, liquid phase, and gas phase. ere are many natural defects with random distribution. Wang et al [5] studied the quantification of the damage degree by the energy in the process of rock failure and analyzed the energy dissipation and energy conversion modes and the stress-energy mechanism that caused rock failure under cyclic loading-unloading. In terms of experimental analysis, Zhang and Goa [8] studied the energy evolution of rocks under uniaxial incrementally cyclic loading-unloading tests. Regarding the study of the elastic energy in the uniaxial compression test of rock under different loading rates, it is calculated by the elastic modulus [12]. E study of the law of energy evolution in rock uniaxial compression tests under different loading rates is of positive significance to topics such as the energy mechanism of rock failure and rock bursts in mines Using the uniaxial staged loading-unloading test combined with the linear energy storage law to analyze the energy evolution in the uniaxial compression tests. e study of the law of energy evolution in rock uniaxial compression tests under different loading rates is of positive significance to topics such as the energy mechanism of rock failure and rock bursts in mines
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