Acta Metallurgica Sinica
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WANGDongwei,TANG Chaosheng,LI Shengjie,ZENG Hao,SHI Bin,ZHANG Biyong
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Abstract: Expansive soil is a kind of typical soil with problems, which is very sensitive to climate change. it is prone to volumetric shrinkage deformation under drought conditions, causing various engineering geological problems. In order to study the desiccation shrinkage deformation characteristics of expansive soil, a series of indoor drying experiments were carried out to determine the shrinkage characteristic curves of expansive soils, and the effects of initial moisture content and dry density on the shrinkage deformation process were mainly analyzed. The effect and mechanism of cement solidification on suppressing desiccation shrinkage deformation of expansive soil are further discussed. The results show that: (1) There are three typical stages in the shrinkage deformation process of expansive soils: normal shrinkage, residual shrinkage, and zero shrinkage. (2) The higher the initial moisture content, the faster the evaporation rate of the sample, and the smaller the void ratio of the sample after the shrinkage deformation is complete, and the larger the final shrinkage strain, the more obvious the shrinkage deformation will be. (3) The larger the initial dry density, the smaller the sample evaporation rate and the final volume shrinkage strain, and the increase of the initial dry density has a significantly reduce the volumetric shrinkage strain of the sample, and it has a good suppressive effect on shrinkage deformation. (5) The dry shrinkage deformation of expansive soil has obvious anisotropic characteristics and is related to the initial state. certain inhibitory effect on the shrinkage deformation of the sample. (4) Incorporating proper amount of cement in expansive soil can
Key words: expensive soil, desiccation shrinkage, initial conditions, shrinkage characterization curve, cement solidification
WANGDongwei,TANG Chaosheng,LI Shengjie,ZENG Hao,SHI Bin,ZHANG Biyong. Experimental Study on Volumetric Shrinkage Behavior of Expansive Soil[J]. Acta Metallurgica Sinica.
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URL: https://geology.nju.edu.cn/EN/
https://geology.nju.edu.cn/EN/Y2019/V25/I5/756