1.1 This test method covers the estimation of the erodibility of a cohesive soil using the miniature jet erosion test (JET). 1.2 This test method can be performed in-situ at a prepared site in the field or in the laboratory on intact or remolded soils to determine soil erodibility parameters. 1.3 The procedures used to specify how data are collected/recorded and calculated in this test method are regarded as the industry standard. In addition, they are representative of the significant digits that should generally be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the users objectives; it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this test method to consider significant digits used in analysis methods for engineering design. 1.4 Units--The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Keywordserosion; jet; soil; water; erodibility; shear stress; cohesive
Estimation of soil erosion potential is an important engineering consideration in evaluation of projects such as stream bank stabilization and erosion of unlined spillways. One method of estimating soil erosion parameters is by the use of the jet erosion test (JET). The original and mini JET test devices were developed by Dr. Gregory J. Hanson of the USDA Agricultural Research Service Hydraulic Laboratory in Stillwater Oklahoma. The original JET test was codified as an ASTM Test Method D5852. This test method has been outdated for some time, primarily in the presentation of required data reduction included in the test method. A proposed replacement of Test Method D5852 has been under way for some time under Work Item WK38977. However, investigators are now primarily using the mini jet rather than the original JET in the evaluation of soil parameters,and a mini JET standard will be of more use to users than the replacement standard for the original JET. The proposed standard will provide a consistent method for test performance and data reduction. Users may include academic investigators, government agencies, and private engineering firms.
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