Experiment on Drying Shrinkage Characteristics of Compacted Kaolin(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2018年05期
- Page:
- 1-8
- Research Field:
- Publishing date:
Info
- Title:
- Experiment on Drying Shrinkage Characteristics of Compacted Kaolin
- Author(s):
- SHAO Long-tan; ZHENG Guo-feng; ZHANG Jun-da
- Department of Engineering Mechanics, Dalian University of Technology
- Keywords:
- drying shrinkage; soil water characteristic curve; shrinkage curve; water content; suction stress compression curve
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the effect of initial dry density and water content on the shrinkage behavior of Kaolin, and research the drying shrinkage mechanism, a series of drying shrinkage tests were carried out to measure the radial strain of the cutting specimen by digital image correlation method. The suction stress compression curve (SSCC) was proposed by combining the shrinkage curve and corresponding soil water characteristic curve (SSCC) of the soil. The test results show that most of the shrinkage deformation of saturated specimen occurs before the air-entry point while the soil is still fully saturated. The anisotropy of the shrinkage deformation of the specimen is evident as radial shrinkage strain is dominated upon drying, while the soil has a tendency to exhibit isotropic volume shrinkage behavior as water content increases. The volumetric shrinkage strain, as well as the elapsed time required for the drying process, decreases with the increase of the initial dry density. However, the water content of the specimen is the same at the end of the drying test, regardless of the initial dry density and water content. The comparison of the SSCC and saturated isotropic compression curve indicates that the suction stress and net mean stress have the same effect on the contraction deformation of the soil. It concludes that effective stress plays a decisive role on the volumetric shrinkage behavior when the soil is under isotropic condition. The proposed method by combining the shrinkage curve and corresponding isotropic compression curve to indirectly measure soil water characteristic curve is relative reliable.
Last Update: 2018-09-03