Method for determining liquefaction potential of cohesionless soils
First Claim
1. A method for determining liquefaction potential of cohesionless soils comprising, employing a rotational vane assembly having a plurality of radially disposed blades mounted to a shaft, a pore pressure sensor mounted to said assembly and communicating by a duct to an outer edge of at least one blade;
- inserting said blades into said soils;
rotating said shaft to revolve said blades to shear said soils and obtaining porewater pressure response measurements from said soils.
1 Assignment
0 Petitions
Accused Products
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.
-
Citations
18 Claims
-
1. A method for determining liquefaction potential of cohesionless soils comprising, employing a rotational vane assembly having a plurality of radially disposed blades mounted to a shaft, a pore pressure sensor mounted to said assembly and communicating by a duct to an outer edge of at least one blade;
- inserting said blades into said soils;
rotating said shaft to revolve said blades to shear said soils and obtaining porewater pressure response measurements from said soils. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- inserting said blades into said soils;
-
12. A rotational vane assembly for determining liquefaction potential of cohesionless soils comprising:
-
a rotatable shaft, a plurality of radially disposed blades mounted to said shaft, a pore pressure sensor mounted to said assembly and communicating by a duct to an outer edge of at least one blade, means for inserting said blades into said soils and means for rotating said shaft to revolve said blades to shear said soils and obtain porewater pressure response measurements from said soils. - View Dependent Claims (13, 14, 15, 16, 17, 18)
-
Specification