...Alexia Cindy Wagner; João Vítor de Azambuja Carvalho; Hugo Carlos Scheuermann Filho; Nilo Cesar Consoli The inherent variability of tailings is the main challenge in compacted filtered tailings stacks (CFTS) operation. Despite the advances in dewatering technologies, the filtration efficiency...

... risks, which is the reason why such structures are being closed in Brazil. A feasible option to ensure the safety of closing operations in such dams consists of extracting tailings from behind the dam (reservoir), reducing moisture content through dewatering and compacting it into stable stacks...

...Zi Ying; Yu-Jun Cui; Nadia Benahmed; Myriam Duc In this study, the drying-induced microstructure evolution of compacted silt with different salinities is investigated using mercury intrusion porosimetry and environmental scanning electron microscope. The pore size distribution (PSD) of specimens...

...Viet Nguyen; Jubert Andrés Pineda; Enrique Romero; Daichao Sheng This paper describes an experimental study aimed at evaluating the influence of soil microstructure on air permeability in compacted clay. Air permeability measurements, estimated using the gas pressure decay method, were carried out...

... the saturated and unsaturated permeability of soils. The tests were conducted on 100 mm dia. reconstituted and compacted samples of glacial till. Suctions were generated by circulating low-humidity air through a slender sand column located at the centre of the samples. Measurements of suction were made by two...

... was conducted to characterise the microstructure of soil specimens compacted under different initial conditions. Then, three pairs of wetting tests under constant load and under controlled suction were conducted in order to identify the zone of onset of collapse. It was found that the conventional LC curves...

... ; Lakshmikantha et al., 2018). Internal fracture formation would be relevant to many engineering applications, such as nuclear buffers, compacted liners (Yesiller et al., 2000), embankment dams (Sherard, 1986 ; Dyer et al., 2009), seal layers for carbon dioxide (CO_{2) storage}...

...Xia Bian; Yu-Jun Cui; Xiao-Zhao Li This paper investigates the swelling behaviour of compacted MX80 bentonite under hydration with the presence of initial voids that simulate the technological voids in real nuclear waste repositories. With water introduced into samples from the initial voids...

...M. Pedrotti; A. Tarantino Reconstituted and compacted soils are commonly assumed to exhibit a fundamentally different behaviour due to different microstructure. However, inspection of pore size distribution of the same soil in compacted and reconstituted states suggests that the boundary between...

... changes occur upon changes of net stress or suction. Consequently, significant variation of permeability can be expected during permeability tests while the soil is in the saturated range. Three series of permeability tests were conducted on statically compacted, dynamically compacted and reconstituted...

...) , the specimens were compacted at R_d ≥ 95%, which could be obtained by controlling the dry mass of soil to achieve a minimum void ratio e_min previously determined by preliminary testing (ASTM D4253 (ASTM, 2006)). The pre-determined soil mass was placed in five distinct...

...Z.-S. Li; J.-M. Fleureau; L.-S. Tang In earthworks, the effect of environmental conditions on compacted soil behaviour is usually complex. One of the major difficulties comes from the coupling of hydraulic and mechanical loadings. This technical note presents some experimental results on compaction...

...T. Thyagaraj; A. P. Das Physico-chemical effects assume significance in geoenvironmental engineering applications where compacted soils and natural soil deposits interact with chemical contaminants. The physico-chemical interactions occur at the microstructural level and affect the macrostructure...

...C. Wersäll; I. Nordfelt; S. Larsson Full-scale tests were conducted to study the influence of the operating frequency of a vibratory roller on the compaction of crushed gravel in a controlled environment. Tests were performed at both fixed and variable frequencies. The average densification...

...T. Thyagaraj; U. Salini The experimental results of the present study on compacted expansive clay illustrate that matric suction increases with the increase in pore fluid osmotic suction due to changes in soil structure. Scanning electron micrographs show that particle stacking (aggregations...

... compaction and post-compaction periods. Limited efforts have been focused on quantifying those post-compacted responses due to the changes in suction induced by wetting and drying cycles. During their service life, most earth structures experience changes in hydraulic behaviour owing to climatic changes...

... methods. It also incorporates a logical approach to consider the effects of soil compaction and construction sequence. Reinforcement extension and soil–reinforcement slippage are considered in the analytical method through two sets of straightforward formulae. The method makes conservative assumptions...

... to suction measurements taken using a psychrometer. Tests were conducted on samples of kaolin under constant water mass conditions. The results address the effects of compaction effort and water content at the time of compaction on the overall performance of unsaturated soils, under different amplitudes...

...E.E. ALONSO; N.M. PINYOL; A. GENS The paper explores the behaviour of compacted soils throughout the (dry density–water content) compaction plane by means of a conceptual framework that incorporates microstructural information. The engineering properties of compacted soils are described...

... of the engineering properties of the compacted material. The material exhibits a very complex behaviour, which is difficult to reproduce with existing constitutive models for unsaturated structured materials. This paper focuses on understanding and providing data on the interaction between the pure marls (rock...