Journal of Earth Sciences and Geotechnical Engineering

Hydraulic Conductivity Measurement of Compacted Clay Soil Liners for Waste Containment Structures

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• Abstract

  Method for in situ measurement of hydraulic conductivity (k) has been developed and procedures for laboratory testing have been modified. Method and procedure are aimed to obtain the significant hydraulic conductivity value and to avoid the effects of cracks or soft fissures. All samples have a minimum value of 95% of maximum dry density ( dmax) from standard and modified compaction test (ASTM D 698 – 91). Each test result uses a sample taken from dry side; wet side and on optimum moisture content (wopt) or OMC. First of all before the falling head test (ASTM D 1804 – 02/ASTM 180485 – 03) uses the leachate liquid (Pondok Rajeg landfill), a solution of 0.005 CaSO4 is flown through the sample and the hydraulic gradient equals 200. Hydraulic conductivity measurement of the falling head test using a leachate liquid starts from the pore volume of flow > 2 until the constant of hydraulic conductivity values is obtained. From the test results, the samples of 3” have hydraulic conductivity value in the range 10-10 to 10-9 cm/sec, and the samples of 10” have a range between 10-8 and 10-7 cm/sec. Generally, the research concludes that the magnification of sample size influences hydraulic conductivity values on each falling head test.