Abstract
Ultrasonic wave velocity is effective to evaluate anisotropy property and predict rock failure. This paper investigates the correlation between dynamic ultrasonic and mechanical properties of sandstones with different buried depths subjected to uniaxial compression tests. The circumferential anisotropy and axial wave velocity of sandstone are obtained by means of ultrasonic wave velocity measurements. The mechanical properties, including Young’s modulus and uniaxial compressive strength, are positively correlated with the axial P wave velocity. The average angles between the sandstone failure plane and the minimum and maximum wave directions are 35.8° and 63.3°, respectively. The axial P wave velocity almost keeps constant, and the axial S wave velocity has a decreasing trend before the failure of rock specimen. In most rock samples under uniaxial compression, shear failure occurs in the middle and splitting appears near both sides. Additionally, the dynamic Young’s modulus and dynamic Poisson’s ratio during loading are obtained, and the negative values of the Poisson’s ratio occur at the initial compression stage. Distortion and rotation of micro/mesorock structures may be responsible for the negative Poisson’s ratio.
Highlights
In western China, most of the coal seams are shallowly buried and have large thicknesses
The ultrasonic probing method can be used to determine physical and mechanical properties and predict the rock failure based on the ultrasonic wave velocity [2]
We investigate the correlation between dynamic ultrasonic and mechanical properties of sandstones with different buried depths subjected to uniaxial compression tests
Summary
In western China, most of the coal seams are shallowly buried and have large thicknesses. The ultrasonic probing method can be used to determine physical and mechanical properties and predict the rock failure based on the ultrasonic wave velocity [2]. The ultrasonic property can be used to determine the spatial distribution of mining-induced fissures in overburden. We investigate the correlation between dynamic ultrasonic and mechanical properties of sandstones with different buried depths subjected to uniaxial compression tests. It obtained the angles between the failure plane and the directions of minimum/maximum ultrasonic wave velocities. The variations of wave velocities and dynamic elastic properties during the loading process are given, which can provide scientific basis for predicting rock failure and the distribution of mining-induced fissures in overburden
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