Variation of P-wave Velocity and Stress WaveAmplitude in Sandstone under Static Stress

CHENG Yun; SONG Zhan-ping; JIN Jie-fang; CHANG Xiao-xu; YUAN Wei

doi:10.11988/ckyyb.20170309

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Journal of Changjiang River Scientific Research Institute ›› 2018, Vol. 35 ›› Issue (10) : 115-119. DOI: 10.11988/ckyyb.20170309

ROCKSOIL ENGINEERING

Variation of P-wave Velocity and Stress WaveAmplitude in Sandstone under Static Stress

CHENG Yun^1,2, SONG Zhan-ping¹, JIN Jie-fang³, CHANG Xiao-xu³, YUAN Wei³

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Abstract

To study the influence of static stress on propagation characteristics of stress wave in sandstone with large length-diameter ratio, impact test of small disturbance is conducted by dynamic and static combined testing system. The variation of stress wave, P-wave velocity and stress wave amplitude attenuation under different static stresses are obtained. Research results imply that stress wave curves of different test points remain approximately the same when static stress is constant; stress wave curves vary remarkably when static stress changes. Compressional wave and tensile wave both exist in the presence of static stress, and tensile wave increases with the increase of static stress. In addition, static stress has a great impact on P-wave velocity in a linear relationship, and P-wave velocity decays exponentially with propagation distance. Moreover, static stress also has obvious influence on stress wave amplitude. With the increase of propagation distance, the jump of stress wave delays gradually and stress wave amplitude tends to attenuate as wave energy is absorbed by sandstone fractures. The results suggest that static stress affects stress wave propagation in sandstone by changing the internal pores or fractures of sandstone.

Key words

sandstone / axial static stress / stress wave / P-wave velocity / propagation feature / amplitude attenuation

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CHENG Yun, SONG Zhan-ping, JIN Jie-fang, CHANG Xiao-xu, YUAN Wei. Variation of P-wave Velocity and Stress WaveAmplitude in Sandstone under Static Stress[J]. Journal of Changjiang River Scientific Research Institute. 2018, 35(10): 115-119 https://doi.org/10.11988/ckyyb.20170309

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