Geotechnical Engineering Journal of the SEAGS & AGSSEA ISSN 0046-5828
Vol. 46 No.3 September 2015
Influence of Mineral Constituents on One-dimensional Compression Behaviour of Clayey Soils
L. Ye1, Y. F. Jin2*, Q. Y. Zhu3 and P. P. Sun4
1Department of Civil Engineering，Zhejiang University of Science and Technology, Hangzhou 310012, China
2Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
3State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou,China
4Department of Civil Engineering，Zhejiang University of Water Resources and Electric Power，Hangzhou 310018, China
E-mail: jyf07507108@126.com
ABSTRACT: Only few data are available concerning the effect of the four main clay minerals, kaolinite (K), illite (I), montmorillonite (M) and chlorite (C), on the mechanical properties of clayey soils. This paper discusses the effect of different mineral contents on the compression and swelling indexes of clay mixtures in order to provide correlations between the mineralogical content of a clayey soil and its compressive properties. Four pure clay powders were used to prepare 34 clay mixtures (different proportions of K+I, K+I+M, K+I+C). Conventional oedometer tests were conducted on all the prepared samples. Based on the test results, the evolution of the compressive properties with the proportions of pure clays was estimated and relevant correlations are suggested. All the results demonstrate that the compression and swelling indexes are reasonably well correlated to the proportion of clay minerals. The content in montmorillonite influences significantly the compressive properties of clayey soils, and the contents of illite and chlorite are less influential when added to kaolinite based clayey soils. Moreover, 15 samples with different proportions of K+I+M+C were prepared and tested, and the proposed correlations were validated in light of the results obtained on these materials.
KEYWORDS: Kaolinite, Illite, Montmorillonite, Chlorite, Compression index, Swelling index.
