Stabilization of soft clay using short fibers and poly vinyl alcohol

Mirzababaei, Mehdi; Arulrajah, Arul; Horpibulsuk, Suksun; Soltani, Amin; Khayat, Navid

doi:10.1016/j.geotexmem.2018.05.001

Cited by 105 publications

(24 citation statements)

References 41 publications

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“…The variations of peak strain energy followed a trend similar to that observed for the peak UC strength, thus indicating that the greater the MC content and/or the longer the curing period, the higher the sample's degree of toughness. An increase in peak strain energy signifies an increase in the peak UC strength and/or the axial strain at failure, thereby indicating a balance between the material's strength and ductility [42][43][44]. As demonstrated in Figure 1b, the axial strain at failure was adversely affected by MC inclusion and/or curing time, and thus should lead to lower peak strain energy values.…”

Section: Effect Of MC On Uc Strengthmentioning

confidence: 98%

Application of Slag–Cement and Fly Ash for Strength Development in Cemented Paste Backfills

et al. 2018

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The present study investigates the combined capacity of a newly developed slag-blended cement (MC) and fly ash (FA) as a sustainable solution towards improving the mechanical performance of the cemented paste backfill (CPB) system of a copper-gold underground mine. A total of thirteen mix designs consisting of three MC-treated and ten MC + FA-treated blends were examined. Samples were prepared with a solids content of 77% (by total mass), and were allowed to cure for 7, 14, 28, 56 and 128 days prior unconfined compression testing. Scanning electron microscopy (SEM) studies were also carried out to observe the evolution of fabric in response to MC and MC + FA amendments. The greater the MC content and/or the longer the curing period, the higher the developed strength, toughness and stiffness. The exhibited improvements, however, were only notable up to 56 days of curing, beyond of which the effect of curing was marginal. The performance of 4% Portland cement or PC (by total dry mass) was found to be similar to that of 1.5% MC, while the higher MC inclusions of 2.5% and 3%, though lower in terms of binder content, unanimously outperformed 4% PC. The use of FA alongside MC improved the bonding/connection interface generated between the tailings aggregates, and thus led to improved mechanical performance compared with similar MC inclusions containing no FA. Common strength criteria for CPBs were considered to assess the applicability of the newly introduced MC and MC + FA mix designs. The mix designs “3% MC” and “2.5% MC + 2–2.5% FA” satisfied the 700 kPa strength threshold required for stope stability, and thus were deemed as optimum design choices.

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Section: Effect Of MC On Uc Strengthmentioning

confidence: 98%

Application of Slag–Cement and Fly Ash for Strength Development in Cemented Paste Backfills

et al. 2018

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“…The results showed that the combined treatment improved the UCS and ductility of the tested clay significantly. Though, the optimum content of binders and fiber content were linked to the initial void ratio and moisture content of the clay sample [6]. Commercially manufactured sulfonated oil with different concentrations was used to treat an expansive soil.…”

Section: Introductionmentioning

confidence: 99%

Strength and Volume Change Characteristics of Clayey Soils: Performance Evaluation of Enzymes

et al. 2020

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This study was conducted to evaluate the strength and volume change characteristics of a sedimentary residual soil mixed with bentonite (S1) when treated with three different enzymes. In addition, three reference clays including bentonite, illite, and kaolinite were also treated with enzymes to study the effect on their strength characteristics. Soil samples prepared at the optimum moisture content (OMC) were sealed and cured for four months. After curing, reference clays were tested for unconfined compressive strength (UCS). For swell tests, the S1 soil samples were placed on porous stones, which were immersed in water to allow capillary soaking of the samples. S1 samples were allowed to dry at ambient temperature for shrinkage test until the rate of reduction in volume became negligible. On completion of swell tests, the samples were tested for UCS to determine the decrease in strength due to saturation. No increase in strength and decrease in volume change were observed for any of the enzymes and dosages. Field Emission Scanning Electron Microscope (FESEM) showed some dense packing of particles for treated samples, whereas X-ray diffraction (XRD) did not reveal any change; in fact, the pattern for untreated and treated soil samples were indistinguishable.

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“…Meanwhile, many scientific research developments have been achieved in backfill mining technology, backfill materials, and the mechanical properties of backfills [6][7][8][9][10][11]. For example, Mirzababaei et al [12][13][14] studied the behavior of soft clay reinforced with short fibers, and found sand ratio of the backfill body, the changing range of the average infrared radiation temperature (AIRT) of the backfill body became increasingly smaller [26][27][28]. Cai et al found that the strength of pillars or rock masses surrounded by backfill material can increase [29,30].…”

Section: Introductionmentioning

confidence: 99%

The Mechanical and Microstructural Properties of Composite Structures Made of a Cement-Tailing Backfill and Rock Core

Tan

Zhang

et al. 2020

Minerals

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In underground metal mines that use sublevel or stage open-stope and backfilling mining methods (SSOBMMs), there is a special structure around which both sides of the rock pillar are wrapped by backfill. As a permanent part of an underground mine, how much can backfill improve the rock pillar’s compressive strength? What is the difference in the mechanical properties between the special structure and the signal rock? To explore these questions, a composite structure made of a cement-tailing backfill (CTB) and rock core (RC) was designed. Uniaxial and triaxial compressive strength tests and scanning electron microscope (SEM) were used to research the mechanical properties, failure process, failure characteristics, and microstructure characteristics of the cement-tailing backfill and rock core (CTB-RC) specimens. It was found that the full stress–strain curve of the CTB-RC specimen under triaxial compressive strength (TCS) test had two times the stress increases reaching a lower peak deviator stress two times after the RC was destroyed. The CTB can reduce the destruction and slow down the deformation speed of the inner rock cor (IRC). It can also prevent rigid slip of the IRC after it is damaged and maintain the stability and integrity of the overall structure. The findings of this study can provide some basic knowledge on the mechanical properties of the CTB-RB and provide theoretical guidance for the optimization direction of the width of the rock pillar and the room in mines using SSOBMMs.

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Stabilization of soft clay using short fibers and poly vinyl alcohol

Cited by 105 publications

References 41 publications

Application of Slag–Cement and Fly Ash for Strength Development in Cemented Paste Backfills

Application of Slag–Cement and Fly Ash for Strength Development in Cemented Paste Backfills

Strength and Volume Change Characteristics of Clayey Soils: Performance Evaluation of Enzymes

The Mechanical and Microstructural Properties of Composite Structures Made of a Cement-Tailing Backfill and Rock Core

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