Patent ID: 6604432
Filing Date: 2003-08-12
Classification: E02D,G01H,G01N

Abstract:
Man portable apparatus for the in-situ measurement of the shear modulus of a compacted layer of soil, said apparatus comprising:a contact foot for engaging a region of soil in the order of 4Â½ inches in nominal diameter; means for applying a downwardly biasing force to said foot, said force being in the order of 35 pounds; means for generating an a.c. drive signal; a drive transducer responsive to said drive signal for applying a vibratory vertical force to said contact foot; a first sensing transducer for sensing motion of said foot and generating a corresponding first output signal; means including a second sensing transducer for sensing force applied to said foot and generating a corresponding second output signal; circuit means for measuring a component of said first output signal which is in phase with said second output signal thereby to obtain a value for a single parameter which is representative of the shear modulus.