Changes of Expansive Soil's Meso-structure and Its Relation with Acoustic Velocity

WEI Bing-xu; GONG Shu; LIU Bin; LIU Xiong; OUYANG Yun-qing

doi:10.11988/ckyyb.20150616

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Journal of Changjiang River Scientific Research Institute ›› 2016, Vol. 33 ›› Issue (9) : 93-97. DOI: 10.11988/ckyyb.20150616

ROCK SOIL ENGINEERING

Changes of Expansive Soil's Meso-structure and Its Relation with Acoustic Velocity

WEI Bing-xu¹,GONG Shu¹,LIU Bin¹,LIU Xiong¹,OUYANG Yun-qing²

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Abstract

The variation law of meso-structure and average P-wave velocity of expansive soil under the condition of drying-wetting cycles was studied through CT technology and TH204 nonmetallic acoustic test.Through defining CT-damage variable by research methods of damage mechanics,the relationship between the changes of meso-structure and the average P-wave velocity resulted from drying-wetting cycles was established.Results show that the first to the fourth drying-wetting cycles have big influence on the meso-structure of expansive soil,and the development of internal micro-crack was obvious; whereas the seventh and the eighth drying-wetting cycles have little influence on the meso-structure.The average P-wave velocity of expansive soil attenuates non-linearly with the increase of cycle times,and finally tends to be stable.With the increase of drying-wetting cycle times, the damage variable of expansive soil increases gradually,and the evolution of meso-structure damage is a non-linear accumulating process.CT damage variable is in a good exponential attenuation relationship with average P-wave velocity.

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CT technology / expansive soil / drying-wetting cycles / meso-structure / average P-wave velocity

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WEI Bing-xu,GONG Shu,LIU Bin,LIU Xiong,OUYANG Yun-qing. Changes of Expansive Soil's Meso-structure and Its Relation with Acoustic Velocity[J]. Journal of Changjiang River Scientific Research Institute. 2016, 33(9): 93-97 https://doi.org/10.11988/ckyyb.20150616

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