Université Blaise Pascal Clermont II

Veolia Eau, Compagnie Generale Des Eaux

Le Centre National De La Recherche Scientifique (cnrs)

Sncf Reseau

Universite De Montpellier 2 Sciences Et Techniques

Centre National Du Machinisme Agricole, Du Genie Rural, Des Eaux Et Des Forets (cemagref)

Centre National De La Recherche Scientifique

Universitè De Montpellier

Université Blaise Pascal - Clermont-ferrand II

Pierre Breul

Daniel Boissier

Pascal Molle

Juan Carlos Quezada

Fathe Bouteldja

Alain Lienard

Christian Vignoles

Gilles Saussine

Franck Radjai

Laurence Rolland

The method for evaluating the compactness of a layer of railroad ballast near a railroad tie includes at least one step of taking at least two measurements () of the penetration resistance (Qd) of the ballast () near one and the same railroad tie (), and a step of calculating the mean value (Qd) of these measurements () of penetration resistance (Qd). Also provided are a device for implementing such a method and a method for predicting the settlement of the ballast of a railroad track including a step of evaluating the compactness of a ballast near a railroad tie.

Method for evaluating the compactness of a layer of railway line ballast, device for implementing same and method for predicting the compaction of said layer of ballast

The invention relates to a method of diagnosing the operation of a water purification installation of the filter medium device type, the material of the filter medium being made up of particles, the method including the following steps: a characterization step of characterizing at least one physical and/or mechanical parameter of the filter medium device to establish a permeability value Ks (expressed in m/s); a comparison step of comparing said established permeability value Ks with a predetermined range [k; k] of permeability values representing a satisfactory operating state of the purification installation; and a diagnosis step during which the filter medium device is assigned an operation indicator according to the result of the comparison step. Applications include non-collective sanitation (NCS) systems and stand-alone sanitation systems.

Method for diagnosing the operation of a water purification installation of the filter medium device type, and a diagnostic tool suitable for said method

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Corent, France

Pierre Breul