Soil compaction measurement

Details Soil compaction measurement Soil compaction measurement

G - Physics

01

N

G01N 3/34 (2006.01) E02D 1/02 (2006.01) G01H 15/00 (2006.01) G01N 3/32 (2006.01) G01N 33/24 (2006.01)

Patent

CA 2245007

The in-situ measurement of the shear modulus of a surface layer of soil (12) is performed by apparatus in which a contact foot (11) with a preselected downward bias force engages a defined area of a region of soil. A drive transducer (13) shakes the contact foot (11) vertically and sensing transducers (17, 18) determine the force applied to the foot (11) and the resulting movement of the foot (11) and generate respective first and second output signals. The in-phase movement responsive output signal is analyzed in relation to the force signal to obtain a measurement of a single parameter which is representative of the stiffness provided by the soil (12). The shear modulus as well as the void ratio of the soil can be calculated from the stiffness. The drive transducer (13) is energized by an A.C. signal which progressively varies in frequency over a preselected band with the rate of change also varying with frequency thereby providing a greater force spectrum content at lower frequencies than at higher frequencies in the band, while maintaining a substantially constant force magnitude.

L'invention porte sur un appareil permettant de mesurer in situ le module de cisaillement d'une couche du sol (12) et comportant un pied (11) de contact, qui poussé par une force descendante présélectionnée, s'enfonce dans une zone donnée du sol. Alors qu'un transducteur (13) secoue le pied (11) verticalement, des capteurs (17, 18) mesurent la force qui lui est appliquée et ses déplacements en résultant, et émettent respectivement un premier et un second signal de sortie. Le signal de sortie émis en phase avec le déplacement est analysé en relation avec le signal de force ce qui permet la mesure d'un seul paramètre en fonction de la résistance du sol (12). Le module de cisaillement ainsi que le taux de pores du sol peuvent être calculés à partir de la résistance. Le transducteur (13) est excité par un signal de courant c.a. dont la fréquence varie progressivement sur une plage présélectionnée selon un taux de variation variable ce qui donne un plus large contenu de spectres de forces aux basses fréquences qu'aux hautes fréquences tout en maintenant la force à un niveau sensiblement constant.

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