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Journal of Chemistry
Volume 2015 (2015), Article ID 685871, 6 pages
http://dx.doi.org/10.1155/2015/685871
Research Article

Heat Transport and Water Permeability during Cracking of the Landfill Compacted Clay Cover

1Institute of Poromechanics, Wuhan Polytechnic University, Wuhan 430023, China
2School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China

Received 27 July 2014; Revised 1 October 2014; Accepted 9 October 2014

Academic Editor: Peng Xu

Copyright © 2015 Haijun Lu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The heat-moisture transport through the compacted clay was observed in laboratory. The hydraulic conductivity of cracked clay under wetting-drying cycles was also investigated. At the early phase of heating, the temperature of soil columns rose fast and moisture decreased dramatically; after this phase, the temperature rose at a lower speed and moisture loss stabilized gradually. The moisture content of compacted clay at 25 cm depth decayed to 0. The crack intensity factor (CIF) of compacted clay was 0.043 and 0.097; the crack depth was about 6.5 cm and 8.2 cm at 50°C and 60°C, respectively. The hydraulic conductivity of compacted clay was within 8.3 × 10−7 to 1.5 × 10−5 cm/s after four wetting-drying cycles. This value was 2~3 orders of magnitude higher than that of uncracked clay.