Abstract
This paper presents an experimental investigation of strength and fatigue properties of intact sandstone samples subjected to dynamic cyclic loading in the laboratory. Tests were conducted on sandstone samples with loading frequencies ranging in 0.5, 1, 2, and 4 Hz, loading amplitudes of 1, 15, 30, 60, 90, and 120 kN, and loading speeds of 0.5, 1, 2, 4, and 8 kN/s. In this study it was shown that the loading frequency, as well as the amplitude and loading speed, was of great significance and affected the mechanical characteristics of sandstone under dynamic cyclic loading. The fatigue life of sandstone was found to decrease with loading speeds and amplitudes but increase with loading frequencies. It was found that the minimum of the dynamic strength and deformation factor of sandstone was obtained at loading speeds of 2 kN/s but the maximum at loading frequencies of 1 Hz. Finally, it was concluded that the relationship between the fatigue life and loading speed, frequency, and stress amplitude under dynamic cyclic loading would be expressed as theS-Ncurve, which showed that the fatigue characteristic of sandstone was similar to that of metal materials.
Highlights
The characteristics of rock and rock masses play a key role in the long-term stability of rock engineering
To investigate the dynamic strength properties of the sandstone samples under different conditions, the sandstone samples were divided into three groups, each subjected to a different cyclic loading scheme and different loading frequencies, different cyclic loading speeds, and different cyclic loading amplitudes
It was found that the peak stress, peak strain, and fatigue life change notably with the change in loading speed
Summary
The characteristics of rock and rock masses play a key role in the long-term stability of rock engineering. In order to understand dynamic mechanical properties of rock as engineering materials, it is necessary to start with the behavior of intact rock. Tien et al [4] studied deformation and fatigue behaviors of saturated sandstone subjected to cyclic loadings. Xiao et al [10] proposed a damage variable to describe the actual evolution process of granite fatigue damage by analyzing the test results of the uniaxial cyclic dynamic tests. Liu and He [11] carried out a series of laboratory tests to assess
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