Study on Swelling-Shrinkage Behavior of Vertisols along Fujian Coast
The climatic zone is characterized by alternate wet and dry seasons along Fujian coast. The vertisols experience periodic swelling-shrinkage during alternate wet and dry seasons. 16 soil samples from different profiles (0~20cm depth, 20~40cm depth)were collected from different regions in the research area. The paper shows the swelling-shrinkage behavior along Fujian coast in terms of morphology, particle content and physical properties of vertisols, The structure of the soil profile varies with depth, while the profile horizonation is weak. Crack network is usually observed on the surface. In addition, this paper investigated the effect of wetting and drying on the expansive chatacteristics of the soil. The test results show that after each cycle, the height of the soil samples increased. This indicates that the swell-shrink behavior of vertisols is not completely reversible. The swelling-shrinkage characteristics of soils become greater with stickier texture. Compared to undisturbed soils, the swelling-shrinkage behavior of disturbed soils are greater.
M. X. Chen and H. J. Zhu, "Study on Swelling-Shrinkage Behavior of Vertisols along Fujian Coast", Advanced Materials Research, Vols. 255-260, pp. 3610-3614, 2011