Hydraulic Conductivity of Two Prototype Clay Liners

摘要: Two prototype liners were constructed at a site near Austin, Texas, using clays of low and high plasticity. The compacted to 100% standard Proctor density water content slightly wet optimum sheepsfoot roller. overall hydraulic conductivity (k) each liner was determined by ponding on the measuring rate seepage. field-measured k’s surprisingly (4x10\u-\u6 9x10\u-\u6 cm/s). After in ponds removed, laboratory permeability tests performed hand-carved samples obtained from liners, with thin-walled sampling tube, laboratory-compacted samples. Field also ring infiltrometers. showed that: (1) Essentially all tests, even undisturbed samples, produced measured k that approximately 1,000 times less than k, (2) infiltration considerable scatter but average close field-mesasured k. findings raise important questions about whether clay are relevant reinforce previous suggestions may contain numerous defects such as fissures, slickensides, zones poor bonding between clods clay, relatively compaction. desirability field is evident results reported.