Accession Number:

AD0415425

Title:

STUDIES OF TRACTIVE FORCES OF COHESIVE SOILS IN EARTH CANALS,

Descriptive Note:

Corporate Author:

BUREAU OF RECLAMATION DENVER COLO

Personal Author(s):

Report Date:

1962-10-19

Pagination or Media Count:

1.0

Abstract:

A field and laboratory study was made to develop a method for determining critical tractive forces of cohesive earth materials for the design of unlined and earth-lined canals. It is desirable to know the critical tractive force value of proposed earth canal materials and to use critical tractive force as a criterion in designing earth canals. Critical tractive force is a more precise value on which to base the design than estimated permissible canal velocities. When the critical tractive force value is known, the methods of design outlined in the references presented can be used to give the most efficient design for the canal. Soil samples were obtained from 46 test reaches in various sizes of canals and laterals constructed on Bureau projects. Soil and hydraulic tractive force properties were measured and computed in the laboratory. The properties measured or computed were critical tractive force from the hydraulic erosion machine, liquid limit, plasticity index, soil density, percent of maximum Proctor density, shrinkage limit, soil gradation using the logarithmic probability method of analysis and unit vane shear values. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE