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Hydraulic-mechanical behavior of partially saturated sand Hydraulisch-mechanisches Verhalten von teilgesättigtem Sand
| Content Provider | Semantic Scholar |
|---|---|
| Author | Schanz, Tom Lins, Yvonne |
| Copyright Year | 2004 |
| Abstract | In this study the complex coupled hydraulic-mechanical behavior of partially saturated granular frictional materials (“sand”) is examined. The material used in our investigation is the well known French Hostun Sand. To study the behavior of partially saturated sand the capillary pressure saturation relationship (soil water characteristic curve: SWCC) for both dense and loose sand specimen was determined. Suction mode as well as pressure mode procedure (axis translation technique) was applied in a modified pressure plate apparatus. The influence of suction on stiffness behavior was studied by performing one dimensional compression and rebound tests in a modified oedometer cell for loose and dense specimen with different initial matric suction values. Matric suction was maintained constant during loading and unloading paths in these tests. Additionally large scale column tests were carried out for loose and dense specimen to investigate capillary pressure-saturation relationship and unsaturated conductivity. The results of the one dimensional compression and rebound tests showed that there is an influence of suction on the compression behavior of the sand which is manifested on the stiffness modules and the compression index of the material for loading conditions. Capillary pressuresaturation relationships which were derived from modified pressure plate apparatus and large scale column test show significant differences in the results for the loose and the dense specimens. A clear influence of the hydraulic loading path direction (hysteresis) can be observed. This phenomenon was also observed for the results of the relative hydraulic conductivity. KURZFASSUNG: In diesem Beitrag werden Ergebnisse einer experimentellen Untersuchung zum gekoppelten hydraulisch mechanischen Verhalten von Sand präsentiert. Ein wichtiges Element zur Beschreibung teilgesättigter granularer Reibungsmaterialien ist die Kapillardruck-Sättigungsbeziehung. Sie beschreibt den Zusammenhang zwischen der Saugspannung und dem Wassergehalt bzw. der Sättigung eines Bodens. Ein wesentliches Merkmal ist die Abhängigkeit dieser Beziehung von der Belastungsrichtung (Hysterese), der Belastungsgeschwindigkeit (dynamischer Einfluss auf die Kapillardruck-Sättigungsbeziehung) und dem initialen Zustand (Hauptbeund Hauptentwässerungskurven versus Scanning Kurven). Des Weiteren werden in diesem Beitrag die relative Permeabilität und die Kompressibilität von Sand in Abhängigkeit von der Saugspannung bzw. der Sättigung ermittelt. Schanz & Lins: Hydraulic-mechanical Behaviour of Partially Saturated Sand BAW-Workshop: Bodenund Sohl-Stabilität – Betrachtungen an der Schnittstelle zwischen Geotechnik und Wasserbau 13-2 13. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://izw.baw.de/publikationen/kolloquien/0/Beitrag_13_BAW-Workshop2004.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
