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Journal of Zhejiang University SCIENCE A 2007 Vol.8 No.5 P.699~706

10.1631/jzus.2007.A0699


Effect of suction change on water content and total volume of an expansive clay


Author(s):  ZHAN Liang-tong, CHEN Ping, NG C.W.W.

Affiliation(s):  Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China; more

Corresponding email(s):   zhanlt@zju.edu.cn, chen_1230@yahoo.com.cn

Key Words:  Expansive soil, Water content, Suction, Swelling, Shrinkage


ZHAN Liang-tong, CHEN Ping, NG C.W.W.. Effect of suction change on water content and total volume of an expansive clay[J]. Journal of Zhejiang University Science A, 2007, 8(5): 699~706.

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DOI - 10.1631/jzus.2007.A0699


Abstract: 
A laboratory study was carried out on both natural and compacted specimens to investigate the complex soil-water interaction in an unsaturated expansive clay. The laboratory study includes the measurement of soil-water characteristic curves, 1D free swelling tests, measurement of swelling pressure and shrinkage tests. The test results revealed that the air-entry value of the natural specimen was quite low due to cracks and fissures present. The hydraulic hysteresis of the natural specimen was relatively insignificant as compared with the compacted specimen. Within a suction range 0 to 500 kPa, a bilinear relationship between free swelling strain (or swelling pressure) and initial soil suction was observed for both the natural and compacted specimens. As a result of over-consolidation and secondary structures such as cementation and cracks, the natural specimens exhibited significant lower swelling (or swelling pressure) than the compacted specimen. The change of matric suction exerts a more significant effect on the water phase than on the soil skeleton for this expansive clay.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

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[3] Gens, A., Alonso, E.E., 1992. A framework for the behavior of unsaturated expansive clays. Canadian Geotechnical Journal, 29:1013-1032.

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[8] Ng, C.W.W., Zhan, L.T., Bao, C.G., Fredlund, D.G., Gong, B.W., 2003. Performance of an unsaturated expansive soil slope subjected to artificial rainfall infiltration. Géotechnique, 53(2):143-157.

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[10] Sridharan, A., Prakash, K., 2000. Classification procedures for expansive soils. Proc. Instn. Civ. Engrs. Geotech. Engeng., 143:235-240.

[11] Vanapalli, S.K., Fredlund, D.G., Pufahl, D.E., 1999. The influence of soil structure and stress history on the soil-water characteristic of a compacted till. Géotechnique, 49(2):143-159.

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