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A Method for Estimating Thickness of Sprayed Concrete Layers from Pumped Volume

AuthorsRodríguez, Ángel; Nabulsi, Samir; Río, Olga
KeywordsSprayed concrete
layer thickness
pumped volume
density function
Issue Date21-May-2010
SeriesEURO:TUN 2009
Procedings of the Second International Conferece on Computational Methods in Tunnelling
AbstractIt is known from experience that when spraying concrete it spreads on the wall, being the distribution of concrete around the axis depending -at the remaining factors constant- on nozzle designo The shape of these "spreadings" have been analysed by different authors [1][2], who shown that a relation between the cross section of single layer strips of sprayed concrete and the spraying process parameters exist. However, no analytical mode1s of this relationship have been found in the literature [1]. The way concrete spreads on the wall can be modelled using a statistical approach by introducing a spraying density function. This [continuous] density function represents the probability of a differential volume of sprayed concrete landing on a differential area around certain coordinates. In this paper a semi-empirical model of the spraying process, based on a parametric family of such density functions is presented. This model allows the estimation of sprayed concrete thickness from operational data (concrete and compressed air flow, distance to wall, nozzle trajectory and actual thickness of sprayed concrete, etc.) The calibration of the main parameters of the model using experimental data is also presented.
Publisher version (URL)Aedificatio Publishers
Appears in Collections:(IETCC) Libros y partes de libros

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