To avoid the potential risks associated with all hazardous wastes, it is important that containment methods are intended to prevent the migration of liquid hazardous wastes or leaks containing hazardous components. Therefore, impermeable barriers were used to prevent contamination. In this study, geotechnical tests were performed on samples by mixing rubber and bentonite with silica fume at certain percentages. The aim of the experimental studies is to evaluate the applicability of certain proportions of silica fume, rubber, and bentonite mixtures as impermeable liner material. Possible cracks in bentonite during drying are reduced by the use of silica fume. Absorption of dynamic effects that may occur on the impermeable barrier layer is achieved by adding waste rubber in a uniform size. Several geotechnical tests were performed to examine the mixed rubber and bentonite with silica fumes. Looking at the results of the whole that mixed rubber and bentonite with silica fume yielded usable results and a blend for construction of a liner.
The availability of alternative materials that do not harm the nature, instead of the additives that are widely used to improve soils, has been the subject of research. In this study, the usability of the biopolymer (Arabic Gam-AG), which is an alternative to the commonly used additives of natural clay soil, in soil improvement was investigated. Time dependent settlement behavior of natural clay soil with and without AG biopolymer was investigated. In this context, the consolidation test was carried out for 1, 7, 14 and 21 days curing periods by making wet mixture of 1%, 2%, and 3% by weight of the natural clay soil sample. As a result of the consolidation test, the consolidation test data of the natural clay soil and the samples prepared by adding AG biopolymer to the natural clay soil were compared. With this study, it was concluded that AG biopolymer positively affects the settlement behavior of natural clay soil. In addition, since AG is a natural material, it has been determined that the engineering properties of such soils can be improved without causing any damage to the environment.
There could be some discontinuities in a soil media such as layers, earth structures, cracks, and fissures so that estimation of stresses and deformations in these types of soil masses are somewhat different from continuous masses. The discontinuities in a soil mass could be considered as a special link between two blocks. Transmitted swelling pressures affected by the soil properties of the backfill especially at the interface between the backfill and retaining wall. In order to estimate the transmitted swelling pressure distribution behind a retaining wall, using with interface element, a new finite element model and a code (SWELPRES) have been developed. To evaluate the effect of backfill characteristics and interface element from the transmitted lateral swelling pressures, four cases of thickness of backfills with or without interface elements are investigated.
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