Assessment of Backfill Hydraulic Conductivity in an Instrumented Soil-Bentonite Cutoff Wall
The objective of this paper is to present a comparison of measured hydraulic conductivities(k)for soil-bentonite(SB)backfill within a 60-m-long section of a 200-m-long,7-m-deep cutoff wall constructed and instrumented for studying SB backfill properties and variability at the field scale.Backfill k was measured using flexible-wall tests(70-mm diameter)on remolded specimens prepared from surface grab samples collected during construction; flexible-wall tests on undisturbed specimens collected from the wall; larger-scale rigid-wall tests(150-mm diameter)on remolded specimens prepared from grab samples; and slug tests conducted within the wall.Applied effective stresses in the laboratory tests ranged from 4–35 kPa,encompassing the range of in-situ stresses measured in the backfill after load transfer and consolidation(8–13 kPa).The results indicate low spatial variability in k for a given test type,consistent with the observed homogeneity of the backfill.Modest variability in k was observed among the different test types,with the slug tests and rigid-wall tests generally yielding slightly higher k relative to the flexible-wall tests at field-representative stresses.
Cutoff wall Hydraulic conductivity Slug test Soil-bentonite
Landon C.Barlow Michael A.Malusis
Bucknell University,Lewisburg,PA 17837,USA
国际会议
The 8th International Congress on Environmental Geotechnics(第八届国际环境土工大会)
杭州
英文
291-299
2018-10-28（万方平台首次上网日期，不代表论文的发表时间）