Development of a Quantitative Method to Predict Critical Shear Stress and Rate of Erosion of Natural Undisturbed Cohesive Soils.
Abstract
A study was conducted in an attempt to develop a quantitative method to predict the hydraulic shear stress at which erosion is initiated (critical shear stress) and the rate of erosion of natural soil (with sufficient cohesiveness to allow undisturbed samples to be taken) along a stream bank. In order to obtain a wide range of properties with sufficient geographical distribution, soil and river water samples were requested from Corps of Engineers (CE) Districts in the United States. Preliminary tests conducted on 42 samples included: (a) free swell test on undisturbed soil; (b) dielectric dispersion on remolded soil; (c) slaking test on undisturbed soil; (d) amount of clay present in soil; (e) soil chemistry (pH and soluble cations); and (g) river water chemistry (pH and soluble cations). Based upon the results of preliminary tests 30 soils were selected for detailed analysis which included: (a) index property tests (hydrometer analyses, specific gravity, organic content, gypsum content, moisture content, unit weight, and Atterberg limits); (b) soil chemistry (exchangeable cations); (c) dielectric dispersion on undisturbed soil; (d) flume erosion tests on undisturbed soil; and (e) rotating cylinder erosion tests on saturated remolded soil.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1980
- Accession Number
- ADA091716
Entities
People
- Ernest Gillogley
- Kandiah Arulanandan
- Ryan Tully
Organizations
- University of California, Davis