不同含水状态下煤矿砂岩SHPB试验与分析

doi:10.13722/j.cnki.jrme.2014.0534

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Abstract In order to investigate the influence of moisture content on rock dynamic mechanical properties，a series uniaxial dynamic compression tests of sandstones with 4 kinds of moisture contents were carried out by split Hopkinson pressure bar(SHPB) apparatus，and corresponding dynamic stress-strain curves were obtained. Sandstone samples from 2 different coalmines were processed into a cylindrical shape with length to diameter ratio of 0.5. The test results show that，under high strain rate loading，the surface tension effect and Stefan effect of free water in cracks generate resistance force for dynamic crack propagation. Furthermore，the higher the moisture content，the larger the resistance force and the higher the dynamic uniaxial compressive strength of sandstone. By fitting analysis，it is found that the dynamic uniaxial compressive strength of sandstone increases in a power function with the moisture content. Because of the voids and micro-cracks in sandstone specimen filling with free water，the longitudinal wave velocity of sandstone also increases in a power function with the moisture content.

Key words： rock mechanics split Hopkinson pressure bar(SHPB) moisture content dynamic strength coalmine sandstone

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2014.0534 OR https://rockmech.whrsm.ac.cn/EN/Y2015/V34/Is1/2888

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