Vol14 No.6: 1194-1201
【Title】Effect of drying environment on engineering properties of an expansive soil and its microstructure
【Author】KONG Ling-wei1; WANG Min2*; GUO Ai-guo1; WANG Yong1
【Addresses】1 State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 2 Rockfield Software Limited, Swansea Wales, SA1 8AS, UK
【Citation】Kong LW, Wang M, Guo AG, et al. (2017) Effect of drying environment on engineering properties of an expansive soil and its microstructure. Journal of Mountain Science 14(6). DOI: 10.1007/s11629-017-4430-z
【Abstract】This paper investigates the effect of drying environment, i.e. temperature and relative humidity, on the engineering properties and microscopic pore size distribution of an expansive soil. The shrinkage tests under different drying temperatures and relative humidity are carried out in a constant climate chamber. Then, the undisturbed samples, prepared in different drying environment, are used for the triaxial tests and mercury intrusion tests. It is found that the drying environment has noticeable influence on the engineering properties of expansive soils and it can be characterized by the drying rate. The linear shrinkage and strength increase with the decrease of the drying rate. The non-uniform deformation tends to happen in the high drying rate, which subsequently furthers the development of cracks. In addition, during the drying process, the variation of pores mainly focuses on the inter-aggregate pores and inter-particle pores. The lower drying rate leads to larger variation of pore size distribution.
【Keywords】Expansive soils; Drying environment; Shrinkage; Strength; Pore size distribution; Triaxial test