%0 Journal Article
%A WEI Bing-xu
%A GONG Shu
%A LIU Bin
%A LIU Xiong
%A OUYANG Yun-qing
%T Changes of Expansive Soil's Meso-structure and Its Relation with Acoustic Velocity
%D 2016
%R 10.11988/ckyyb.20150616
%J Journal of Changjiang River Scientific Research Institute
%P 93-97
%V 33
%N 9
%X 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.
%U http://ckyyb.crsri.cn/EN/10.11988/ckyyb.20150616