On the Swelling-Shrinkage Characteristics of Weakly Expansive Soil with Different Initial Water Contents
The swelling-shrinkage characteristics of expansive soils have great influence on the stability and settlement of electricity transmission towers, so that it is very important to estimate accurately the climate-dependent volume/stress change of the expansive soil foundations. In this paper, a kind of weakly expensive soil taken from a transmission tower foundation in Henan province were studied. One-dimensional swelling tests and constant volume tests were conducted to study the swelling ratio and swelling pressure of the expensive soils under different water contents which were chosen in accordance with the actual climate conditions. Results show that both swelling ratio and swelling pressure decrease linearly with the increase of initial water content, while the swelling rate increases with the decrease of water content; shrinkage ratio is linear to initial water content, while shrinkage anisotropy becomes more obvious with the increase of initial water content.
KeywordsExpansive soils Volume change Swelling pressure Oedometer tests
This study was financially supported by the National Grid Company Technology Project (grant no. 5217L0160001).
- 2.Li, Z.: Expansion characteristics and construction control of remolded Mengzi expansive soil. Chin. J. Geotech. Eng. 30(12), 1855–1860 (2008)Google Scholar
- 3.Zou, W.: Nonlinear strength property of remolded expansive soil and its stress-strain relationship for soaking after one-dimensional consolidation. Rock Soil Mech. 33(S2), 59–64 (2012)Google Scholar
- 4.Lu, Z.: Experimental study of the swelling force of remolded expansive soils. J. Hebei Univ. Eng. Nat. Sci. Edition 23(3), 47–50 (2015)Google Scholar
- 5.Ding, Z.: Trial study on variation regularity of swelling force. Rock Soil Mech. 28(7), 1328–1332 (2007)Google Scholar
- 6.Yang, Q.: Testing study on shear strength of unsaturated expansive soils. Chin. J. Rock Mechan. Eng. 23(3), 420–425 (2004)Google Scholar
- 7.Kong, L.: Study on shear strength and swelling-shrinkage characteristic of compacted expansive soil. In: Asian Conference on Unsaturated Soils 2000, Singapore, pp. 515–519 (2000)Google Scholar
- 8.Guo, W.: On research method for air-influenced depth to expansive soil in Nan yang basin. Yangtze River 38(9), 8–10 (2007)Google Scholar
- 11.Li, Z.: Research on expansion and contraction rules and disaster mechanism of expansive soil. In: Tenth National Symposium on Numerical Analysis and Analysis of Geotechnical Mechanics 2010 (2010)Google Scholar