Method for determining liquefaction potential of cohesionless so

Details Method for determining liquefaction potential of cohesionless so Method for determining liquefaction potential of cohesionless so

1990-06-27

1992-05-05

Raevis, Robert

Measuring and testing

Hardness

By penetrator or indentor

G01N 300

Patent

active

051097028

ABSTRACT:
A method for determining the liquefaction potential of cohesionless (granular) soils is provided in which a rotational shear vane assembly having a plurality of radially disposed blades (herein a Piezovane) is mounted to a shaft having a porewater pressure transducer mounted to such assembly and communicating to an outer edge of at least one the blades, with a torque transducer mounted to such shaft and a potentiometer connected to an upper portion of the shaft to measure rotational displacement of such blades. The vane assembly blades are inserted into undisturbed soil and rotated one or more turns to obtain porewater pressure response measurements from the soil shear surface defined by the blade ends along with torque and rotational displacement measurements. A porewater pressure increase indicates a contractive soil which has the potential to liquefy (and cause landslides) while a porewater pressure decrease indicates a dilating soil which does not readily liquefy and is suitable for building thereon.

REFERENCES:
patent: 3456509 (1969-07-01), Thordarson
patent: 3561259 (1971-02-01), Barendse
patent: 3906781 (1975-09-01), Vlasblom
patent: 4408481 (1983-10-01), Sidey
patent: 4411160 (1983-10-01), Lutenegger et al.
patent: 4453401 (1984-06-01), Sidey
patent: 4594899 (1986-06-01), Henke et al.
patent: 4649741 (1987-03-01), Strom

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