Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Field-Scale Unsaturated Hydraulic Properties of Compacted and Uncompacted Earthen Covers
Unsaturated hydraulic properties influence the field hydrology of engineered earthen covers. Field-measured hydraulic properties of soils are recommended because they closely represent the field structure of the soil. This paper presents unsaturated hydraulic properties of two field-scale test sections, composed of compacted vs. uncompacted clay. The unsaturated hydraulic properties were estimated using continuous measurements of water contents and matric suctions. The water contents and matric suctions were measured by sensors installed in the field test sections. The unsaturated hydraulic conductivities were estimated using the instantaneous profile method. The water content versus suction relationships for the two test sections showed significant differences at low suctions, and the relationships were similar at higher suctions. The only difference between the test sections was the compaction state. The compacted clay test section had higher dry unit weight than the uncompacted clay test section. The uncompacted clay had greater volume of interclod voids (macropores). The differences in water content versus suction relationships at low suction could be because of macropores, which empty out first and fill up last under unsaturated conditions. At higher suctions, the relationships were similar because the flow is controlled by the micropores that existed in both test sections.
Field-Scale Unsaturated Hydraulic Properties of Compacted and Uncompacted Earthen Covers
Unsaturated hydraulic properties influence the field hydrology of engineered earthen covers. Field-measured hydraulic properties of soils are recommended because they closely represent the field structure of the soil. This paper presents unsaturated hydraulic properties of two field-scale test sections, composed of compacted vs. uncompacted clay. The unsaturated hydraulic properties were estimated using continuous measurements of water contents and matric suctions. The water contents and matric suctions were measured by sensors installed in the field test sections. The unsaturated hydraulic conductivities were estimated using the instantaneous profile method. The water content versus suction relationships for the two test sections showed significant differences at low suctions, and the relationships were similar at higher suctions. The only difference between the test sections was the compaction state. The compacted clay test section had higher dry unit weight than the uncompacted clay test section. The uncompacted clay had greater volume of interclod voids (macropores). The differences in water content versus suction relationships at low suction could be because of macropores, which empty out first and fill up last under unsaturated conditions. At higher suctions, the relationships were similar because the flow is controlled by the micropores that existed in both test sections.
Field-Scale Unsaturated Hydraulic Properties of Compacted and Uncompacted Earthen Covers
Saravanathiiban, Duraisamy S. (Autor:in) / Khire, Milind V. (Autor:in)
Geo-Congress 2014 ; 2014 ; Atlanta, Georgia
Geo-Congress 2014 Technical Papers ; 1859-1869
24.02.2014
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
Field-Scale Unsaturated Hydraulic Properties of Compacted and Uncompacted Earthen Covers
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