Filtration of cement-based grouts measured using a long slot

Draganović, Almir; Stille, Håkan

doi:10.1016/j.tust.2014.04.010

Cited by 35 publications

(8 citation statements)

References 10 publications

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“…The quantities of b min and b crit , developed by Eriksson and Stille (2003), have been the most common used criteria representing the filtration tendency and the penetrability of the grout (Draganovic and Stille 2014). By definition, the b min is the minimum fracture aperture a grout can penetrate at all, whereas the b crit represents the minimum fracture aperture a grout can penetrate without filtration.…”

Section: (D) the Evaluation Methodsmentioning

confidence: 99%

“…This was principally due to the fact that the instruments have been designed based on different assumptions, limitations, and test conditions. For instance, the results obtained from Penetrability meter and Filter pump were mostly in contradiction with the ones obtained from Short slot (Draganovic and Stille 2014). Hjertström (2001) using the NES method, a smooth slot approximately similar to Short slot, and Eriksson and Stille (2003) using Penetrability meter illustrated that the penetrability is independent of water to cement (w/c) ratio.…”

Section: Introductionmentioning

confidence: 93%

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Uncertainties in Grout Penetrability Measurements; Evaluation and Comparison of Filter pump, Penetrability Meter and Short Slot

et al. 2017

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To measure grout penetrability in fractured hard rock, various measuring instruments have been developed over the years. Penetrability meter and Filter pump have been designed to use in both the lab and the field. Short slot has been applicable mainly in the lab due to its complexity. The fact, that these instruments have been built based on different assumptions, limitations, and test conditions, makes their results occasionally in contradict. Deficiency in design of the instruments as well as the methods of evaluating grout penetrability is additionally a basis for uncertainty in results. This study is an experimental effort to determine and thoroughly perceive the nature of the most governing uncertainties in grout penetrability measurements. The test apparatus, procedure, and method used to evaluate the grout penetrability in both Penetrability meter and Filter pump were thus modified. The aim was to control the corresponding uncertainties and make their limitations and test conditions as similar as possible with the ones in Short slot. The results suggested that to obtain a more realistic evaluation of the grout penetrability, measurement should be accomplished at both the high and the low pressures with sufficient grout volume using Short slot. Moreover, application of both Filter pump and Penetrability meter is no longer recommended due to the revealed uncertainties.

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Section: (D) the Evaluation Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Uncertainties in Grout Penetrability Measurements; Evaluation and Comparison of Filter pump, Penetrability Meter and Short Slot

et al. 2017

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“…At present, many scientific researchers have been conducting significant research on slurry diffusion rules, and fruitful research results have been achieved [12][13][14][15][16]. Grouting theory is the basis for the study of slurry diffusion rules, which can provide guidance for the design and implementation of grouting engineering [17][18][19][20][21][22]. The existing grouting theories mainly include pore rock mass grouting theory [23], fractured rock mass grouting theory [24], fracturing grouting theory [25], compaction grouting theory [26], and dynamic water grouting theory [27].…”

Section: Introductionmentioning

confidence: 99%

Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Zhai

Bai

2022

Mathematics

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Grouting is one of the main technical means to prevent water inrush hazards in coal seam floor aquifers. It is of great significance to elucidate the diffusion law of slurry in the process of grouting in fractured aquifers for safe mining in coal mines. In this paper, the mechanism of slurry diffusion in horizontal fractures of fractured aquifers was studied based on the Bingham slurry with time-varying characteristics; additionally, a one-dimensional seepage grouting theoretical model considering the temporal and spatial variation of slurry viscosity under constant grouting rate was established. In this model, the grouting pressure required by the predetermined slurry diffusion radius can be obtained by knowing the grouting hole pressure and injection flow. Slurry properties, fracture parameters, grouting parameters, and water pressure were the parameters affecting the slurry diffusion process. Looking at the problem of water disaster prevention of coal seam floor in the Working Face 2509 of the Chensilou Coal Mine, according to the aquifer parameters and model calculation results, a grouting scheme with a slurry diffusion radius of 20 m and grouting pressure of 12 MPa was proposed. Finally, with the comparative analysis of the transient electromagnetic method (TEM) and water inflow before and after grouting, it was verified that the design grouting pressure and the spacing of grouting holes were reasonable and the grouting effect was good.

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“…Cement-based grouting of rock fractures to minimize water inflow into underground constructions, e.g., tunnels, is a common practice, especially in Scandinavia (Håkansson et al 1992;Fransson 2001;Gustafson and Stille 2005;Gustafson et al 2013;Axelsson et al 2009;El Tani 2012;Rahman et al 2017;Zou et al 2018Zou et al , 2019. The effectiveness of the grouting process depends largely on fracture geometry, grouting design and execution, penetrability, and rheological properties of the cement grouts that are used (Zou et al 2019;Håkansson 1993;Draganović and Stille 2014;Stille 2015;Fransson et al 2016;Nejad Ghafar 2017).…”

Section: Introductionmentioning

confidence: 99%

Radial flow velocity profiles of a yield stress fluid between smooth parallel disks

et al. 2020

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In rock grouting, idealized 2D-radial laminar flow of yield stress fluids (YSF) is a fundamental flow configuration that is used for cement grout spread estimation. A limited amount of works have presented analytical and numerical solutions on the radial velocity profiles between parallel disks. However, to the best of our knowledge, there has been no experimental work that has presented measured velocity profiles for this geometry. In this paper, we present velocity profiles of Carbopol (a simple YSF), measured by pulsed ultrasound velocimetry within a radial flow model. We describe the design of the physical model and then present the measured velocity profiles while highlighting the plug-flow region and slip effects observed for three different apertures and volumetric flow rates. Although the measured velocity profiles exhibited wall slip, there was a reasonably good agreement with the analytical solution. We then discuss the major implications of our work on radial flow.

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Filtration of cement-based grouts measured using a long slot

Cited by 35 publications

References 10 publications

Uncertainties in Grout Penetrability Measurements; Evaluation and Comparison of Filter pump, Penetrability Meter and Short Slot

Uncertainties in Grout Penetrability Measurements; Evaluation and Comparison of Filter pump, Penetrability Meter and Short Slot

Diffusion Mechanism of Slurry during Grouting in a Fractured Aquifer: A Case Study in Chensilou Coal Mine, China

Radial flow velocity profiles of a yield stress fluid between smooth parallel disks

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