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Journal of Shanghai University >

2016 , Vol. 22 >Issue 4: 505 - 514

DOI: https://doi.org/10.3969/j.issn.1007-2861.2015.03.019

Experiments on loess as intermediate cover in landfills in northwest China

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  • 1. Xi’an Solid Waste Administration, Xi’an 710038, China;
    2. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China

Received date: 2015-06-09

  Online published: 2016-08-30

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Abstract

The functions of intermediate covering layer of landfill include temporary enclosure of garbage, control of rainfall infiltration, reducing mosquito breeding, etc. High density polyethylene (HDPE) film is easy to pierce to cause rain infiltration, but the cost is high. The northwest area of China is dry, with loess widely distributed. It is convenient to be used as a landfill intermediate cover. Experimental studies are carried out on tamping construction, impervious performance and impervious performance deterioration after wetting and drying cycles. The results show that the saturated permeability coefficient of loess increases with increasing dry density. Dry density reaches 1.60 g/cm3 when its permeability is from 10−7 cm/s to 10−6 cm/s. The field double ring in situ experimental permeability coefficient is 8.37×10−8 cm/s, about double as in the indoor test. With the natural drying wetting cycle condition of saturated infiltration coefficient being 1.18×10−6 cm/s, it is 14 times greater than the condition without crack. Adding a soil vegetation layer with thickness of 15 cm, cracking of loess is suppressed.

Key words：  anti-seepage performance;  loess;  temporary cover; landfill

Cite this article

SHI Wei1, CHAI Xiaoli2 . Experiments on loess as intermediate cover in landfills in northwest China[J]. Journal of Shanghai University, 2016 , 22(4) : 505 -514 . DOI: 10.3969/j.issn.1007-2861.2015.03.019

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