Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Review of the Equations Used to Calculate Hydraulic Conductivity Values from Two-Stage Borehole Tests
Hydraulic conductivity field testing of compacted clay liners (CCLs) is an important control for landfill construction. The Two Stage Borehole (TSB) test, as described by ASTM D6391-11, is one of the field tests commonly used to evaluate CCLs. To evaluate the methods proposed in ASTM D6391 (Methods A, B, and C), a laboratory experiment to evaluate the results obtained from the different methods was performed. The experiment was to perform a TSB test on three field-scale test pads constructed in the laboratory and in accordance with the three methods. The results obtained from TSB testing led to the conclusion that Methods B and C, as written in the ASTMs D6391-11 standard contained errors that impacted the obtained results from hydraulic conductivity testing. The value of hydraulic conductivity determined from Method C (1.43E-07) is off by a factor of four; when the data were reevaluated utilizing a corrected Method C equation the values compared favorably with the Method A results (3.58E-08 and 4.88E-8, respectively). The values obtained utilizing Method B provided results as much as two orders of magnitude greater than the hydraulic conductivity determined from other methods, this is attributed to Method B being unconstrained.
Review of the Equations Used to Calculate Hydraulic Conductivity Values from Two-Stage Borehole Tests
Hydraulic conductivity field testing of compacted clay liners (CCLs) is an important control for landfill construction. The Two Stage Borehole (TSB) test, as described by ASTM D6391-11, is one of the field tests commonly used to evaluate CCLs. To evaluate the methods proposed in ASTM D6391 (Methods A, B, and C), a laboratory experiment to evaluate the results obtained from the different methods was performed. The experiment was to perform a TSB test on three field-scale test pads constructed in the laboratory and in accordance with the three methods. The results obtained from TSB testing led to the conclusion that Methods B and C, as written in the ASTMs D6391-11 standard contained errors that impacted the obtained results from hydraulic conductivity testing. The value of hydraulic conductivity determined from Method C (1.43E-07) is off by a factor of four; when the data were reevaluated utilizing a corrected Method C equation the values compared favorably with the Method A results (3.58E-08 and 4.88E-8, respectively). The values obtained utilizing Method B provided results as much as two orders of magnitude greater than the hydraulic conductivity determined from other methods, this is attributed to Method B being unconstrained.
Review of the Equations Used to Calculate Hydraulic Conductivity Values from Two-Stage Borehole Tests
Blanchard, Johnathan (Autor:in) / Nanak, Matthew (Autor:in) / Coffman, Richard A. (Autor:in)
Geo-Congress 2022 ; 2022 ; Charlotte, North Carolina
Geo-Congress 2022 ; 140-148
17.03.2022
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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