Permeability of soil-bentonite cut-off wall backfill material

Buried pipe design requires knowledge about the fill to design the backfill structure. The interaction between the backfill envelope and the pipe impacts the structural performance of the buried pipe. The backfill material and compaction level respond to the backfill’s overall strength and, therefore, for pipe-soil interaction. The strength of backfill material is described in terms of modulus of soil reaction E’ and constrained modulus Eode. As the E’ is an empirical parameter, the Eode can be measured in the laboratory by performing the oedometer tests. In this study, we have performed extensive oedometric tests on five types of anthropogenic materials (AM). Three of them are construction and demolition materials (C–D materials) namely, recycled concrete aggregate (RCA), crushed brick (CB), and recycled asphalt pavement (RAP). Two of them are industrial solid wastes (ISW) namely, fly ash and bottom slag mix (FA + BS) and blast furnace slag (BFS). The results of the tests revealed that AM behaves differently from natural aggregates (NA). In general, the Eode value for AM is lower than for NA with the same gradation. Despite that, some of AM may be used as NA substitute directly (RCA or BFS), some with special treatment like CB and some with extra compaction efforts like RAP or FA + BS.

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Long-term performance of zeolite Na A-X blend as backfill material in near surface disposal vault

Chemical Engineering Journal ◽

10.1016/j.cej.2008.10.011 ◽

2009 ◽

Vol 149 (1-3) ◽

pp. 143-152 ◽

Cited By ~ 32

Author(s):

R.O. Abdel Rahman ◽

H.A. Ibrahim ◽

N.M. Abdel Monem

Keyword(s):

Near Surface ◽

Backfill Material ◽

Long Term Performance ◽

Term Performance

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Sorption of radionuclides to a cementitious backfill material under near-field conditions

Mineralogical Magazine ◽

10.1180/minmag.2012.076.8.53 ◽

2012 ◽

Vol 76 (8) ◽

pp. 3401-3410 ◽

Cited By ~ 7

Author(s):

M. Felipe-Sotelo ◽

J. Hinchliff ◽

N. Evans ◽

P. Warwick ◽

D. Read

Keyword(s):

Organic Compounds ◽

Degradation Products ◽

Cellulose Degradation ◽

Near Field ◽

Organic Ligand ◽

Sorption Isotherms ◽

Field Conditions ◽

Sorption Behaviour ◽

Backfill Material ◽

Order Of Magnitude

AbstractThe sorption behaviour of I−, Cs+, Ni2+, Eu3+, Th4+ and UO2+2on NRVB (Nirex reference vault backfill) a possible vault backfill, at pH 12.8 was studied. Sorption isotherms generated were compared to results obtained in the presence of cellulose degradation products (CDP). Whereas Cs was not affected by the presence of the organic compounds, a notable reduction in the sorption of Th and Eu to cement was observed. The results also indicated limited removal of Ni from solution (with or without an organic ligand) by sorption, the concentration in solution seemingly being determined solely by solubility processes. In the case of uranium, the presence of CDP increased the sorption to cement by almost one order of magnitude. Further studies into the uptake of CDP by cement are being undertaken to identify the mechanism(s) responsible.

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JUSTIFICATION OF THE USE OF METALLURGICAL SLAGS AS A BACKFILL MATERIAL FOR QUARRY CAVITIES

JOURNAL of Donetsk mining institute ◽

10.31474/1999-981x-2021-2-15-25 ◽

2021 ◽

pp. 15-25

Author(s):

Volodymyr Bondarenko ◽

◽

Oleksandr Filonenko ◽

Mykhailo Petlovanyi ◽

Vladyslav Ruskykh ◽

...

Keyword(s):

Blast Furnace ◽

Large Scale ◽

Experimental Studies ◽

Metallurgical Slag ◽

Open Pit ◽

Practical Significance ◽

Steel Smelting ◽

Backfill Material ◽

Steel Making ◽

Metallurgical Slags

Purpose. Experimental studies of the interaction of blast-furnace and steel-making slags with open pit waters during their direct contact and assessment of the volume of filling of the formed man-made cavities during mining of mineral deposits. Methods. Based on the analysis, the current low level of metallurgical slag and the lack of real and effective directions of their large-scale utilization were determined. The laboratory studies of the interaction of metallurgical slags with open pit water at a certain time of interaction, generally accepted methods for studying the chemical composition and concentration of substances in water, computer-aided design software packages and drawings to determine the volumes of the open pit mined-out area were used. Results. The dynamics of changes in the products of interactions of steel-smelting slags with open-pit waters at a certain ratio and period of interaction was investigated. It was found that the concentration of pollutants upon contact of water with steel-making slag changes according to polynomial dependences on the time of their interaction, decreasing by the 30th day, which eliminates the danger for the aquifer. The safest type of metallurgical slag was recommended for the formation of the bottom layer of the backfill massif. The volumes of the mined-out area of the open pit were determined in detail to assess the volumes of placement of the backfill material based on metallurgical slags. Scientific novelty. The safety of the contact of backfill materials based on steelmaking slags with open pit water was scientifically proven, which is confirmed by the established polynomial patterns of changes in concentrations and pollutants from the ratio and time of interaction. Practical significance. The formation of the backfill massif on the basis of blast-furnace dump and steel-smelting slags will allow achieving an environmental effect, such as their safe disposal as a reclamation of technologically disturbed lands by mining and restoration of the economic value of the land plot, as well as preventing the formation of new dumps.

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NUMERICAL AND PHYSICAL MODELLING OF KAOLIN AS BACKFILL MATERIAL FOR POLYMER CONCRETE RETAINING WALL

Jurnal Teknologi ◽

10.11113/jt.v76.5428 ◽

2015 ◽

Vol 76 (2) ◽

Author(s):

Ali Arefnia ◽

Khairul Anuar Kassim ◽

Houman Sohaei ◽

Kamarudin Ahmad ◽

Ahmad Safuan A Rashid

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Numerical Analysis ◽

Retaining Wall ◽

Laboratory Data ◽

Physical Modelling ◽

Horizontal Displacement ◽

Polymer Concrete ◽

The Finite Element Method ◽

Backfill Material

The failure mechanism of backfill material for retaining wall was studied by performing a numerical analysis using the finite element method. Kaolin is used as backfill material and retaining wall is constructed by Polymer Concrete. The laboratory data of an instrumented cantilever retaining wall are reexamined to confirm an experimental working hypothesis. The obtained laboratory data are the backfill settlement and horizontal displacement of the wall. The observed response demonstrates the backfill settlement and displacement of the retaining wall from the start to completion of loading. In conclusion, numerical modelling results based on computer programming by ABAQUS confirms the experimental results of the physical modelling.

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