Abstract
In order to study the influence characteristics of water bath at different temperatures on rock physical and dynamic mechanical properties, a total of 15 groups of temperature-water bath treatment were carried out on coal mine roadway sandstone at 25°C∼95°C, and the basic physical parameters were tested. The impact compression test was carried out using the split Hopkinson pressure bar (SHPB) device. The results show that, with the increase of water bath temperature, the particle gap on the specimen surface increases. The volume, mass, and density of the specimens all increased with the increase of water bath temperature, and the increase was closely related to the water bath temperature. The dynamic compressive strength increases as a quadratic function of the water bath temperature, and the rate of increase is different before and after 45°C. The dynamic peak strain and average strain rate showed a quadratic function with the water bath temperature. The dynamic peak strain before 45°C decreased with the temperature increasing, and the dynamic peak strain after 45°C increased with the temperature increasing. The dynamic elastic modulus increased first and then decreased with the increase of water bath temperature and reached the maximum at 45°C. The failure pattern of sandstone is spalling. With the increase of water bath temperature, the fracture degree of the specimen gradually decreases.
Highlights
In recent years, with increasing excavation depth of underground space, the ground temperature is getting higher [1]
Yu et al [4] studied the variation characteristics of mass and longitudinal wave velocity with temperature after limestone was subjected to a high temperature of 20°C to 650°C and carried out uniaxial compression tests under static load
For studying physical and dynamic mechanical properties of sandstone is influenced by temperature and water coupling rules, the basic physical parameters of sandstone specimens after water bath at 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, and 95°C were measured, and the color, mass, volume, and density of the specimens were compared and analyzed. e impact compression tests of sandstone specimens subjected to different water bath temperatures were carried out under similar loading conditions by using split Hopkinson pressure bar (SHPB) equipment. e correlation between dynamic characteristics of the specimens, such as peak stress strength, dynamic elastic modulus, average strain rate, and failure mode, and the change of water bath temperature was studied
Summary
With increasing excavation depth of underground space, the ground temperature is getting higher [1]. Fu et al [29] carried out uniaxial compression tests on rock samples under natural state, saturated water action, and dry-wet cycle, to analyze the uniaxial compressive strength and elastic modulus of sandstone. Wang et al [32] carried out a uniaxial dynamic compression test and dynamic splitting test on fine sandstone in a natural and saturated state and analyzed the effects of water and loading rate on dynamic tensile and compressive strength of fine sandstone and their differences. An et al [42] carried out experimental research on rocks under the coupling action of high temperature and dynamic load, carried out dynamic and static tests on rocks, and obtained the relationship curves among loading rate, strain, temperature, compressive strength, and tensile strength. For studying physical and dynamic mechanical properties of sandstone is influenced by temperature and water coupling rules, the basic physical parameters of sandstone specimens after water bath at 25°C, 30°C, 35°C, 40°C, 45°C, 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, 80°C, 85°C, 90°C, and 95°C were measured, and the color, mass, volume, and density of the specimens were compared and analyzed. e impact compression tests of sandstone specimens subjected to different water bath temperatures were carried out under similar loading conditions by using SHPB equipment. e correlation between dynamic characteristics of the specimens, such as peak stress strength, dynamic elastic modulus, average strain rate, and failure mode, and the change of water bath temperature was studied
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