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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F14%3A10293221%21RIV15-MSM-11310___
rdf:type
n15:Vysledek skos:Concept
dcterms:description
In North-western Bohemia the excavated overburden from open-cast coal mines is end-dumped in fills. Clay-type soil prevails among the filled soils. As a consequence of the character and state of the soil, together with the mining and dumping technology, the clay fill comprises a typical lumpy structure. Large and open macrovoids between the single lumps are a characteristic feature of the clay fills. The filled overburden forms spoil heaps under high angles of repose (as high as 40 degrees) which is governed by size and shape of the lumps. However these slopes cannot be considered for design of clay fill final slopes. The lumpy clay fill structure is metastable. Structure transitions influencing the mechanical behaviour and thus slope inclination of the heaps are presented in this contribution. Three main agents are responsible for the transitions of the lumpy structure: Plastic straining of relatively weak lumps as a consequence of overburden load; collapse on wetting of the open metastable structure mainly in the early stages after landfilling; and oscillations of matric suction. Long-term monitoring of matric suction in years 2004 - 2008 at depths up to 2 metres in the low-gradient slope of the reclaimed clay fill in the Bilina mine show clear seasonal suction oscillations. (C) 2014 Elsevier B.V. In North-western Bohemia the excavated overburden from open-cast coal mines is end-dumped in fills. Clay-type soil prevails among the filled soils. As a consequence of the character and state of the soil, together with the mining and dumping technology, the clay fill comprises a typical lumpy structure. Large and open macrovoids between the single lumps are a characteristic feature of the clay fills. The filled overburden forms spoil heaps under high angles of repose (as high as 40 degrees) which is governed by size and shape of the lumps. However these slopes cannot be considered for design of clay fill final slopes. The lumpy clay fill structure is metastable. Structure transitions influencing the mechanical behaviour and thus slope inclination of the heaps are presented in this contribution. Three main agents are responsible for the transitions of the lumpy structure: Plastic straining of relatively weak lumps as a consequence of overburden load; collapse on wetting of the open metastable structure mainly in the early stages after landfilling; and oscillations of matric suction. Long-term monitoring of matric suction in years 2004 - 2008 at depths up to 2 metres in the low-gradient slope of the reclaimed clay fill in the Bilina mine show clear seasonal suction oscillations. (C) 2014 Elsevier B.V.
dcterms:title
Transitions in structure of clay fills due to suction oscillations Transitions in structure of clay fills due to suction oscillations
skos:prefLabel
Transitions in structure of clay fills due to suction oscillations Transitions in structure of clay fills due to suction oscillations
skos:notation
RIV/00216208:11310/14:10293221!RIV15-MSM-11310___
n3:aktivita
n18:I
n3:aktivity
I
n3:dodaniDat
n8:2015
n3:domaciTvurceVysledku
n12:8447721
n3:druhVysledku
n5:D
n3:duvernostUdaju
n13:S
n3:entitaPredkladatele
n6:predkladatel
n3:idSjednocenehoVysledku
51051
n3:idVysledku
RIV/00216208:11310/14:10293221
n3:jazykVysledku
n4:eng
n3:klicovaSlova
Matric suction oscillations; Structure degradation; Lumpy soil; Clay fill
n3:klicoveSlovo
n14:Structure%20degradation n14:Clay%20fill n14:Lumpy%20soil n14:Matric%20suction%20oscillations
n3:kontrolniKodProRIV
[8A76DEF59D58]
n3:mistoKonaniAkce
Naples, ITALY
n3:mistoVydani
AMSTERDAM
n3:nazevZdroje
THIRD ITALIAN WORKSHOP ON LANDSLIDES: HYDROLOGICAL RESPONSE OF SLOPES THROUGH PHYSICAL EXPERIMENTS, FIELD MONITORING AND MATHEMATICAL MODELING
n3:obor
n19:JM
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
3
n3:rokUplatneniVysledku
n8:2014
n3:tvurceVysledku
Kostkanová, Vladislava Boháč, Jan Herle, Ivo
n3:typAkce
n10:EUR
n3:wos
000345396400016
n3:zahajeniAkce
2013-10-23+02:00
s:issn
1878-5220
s:numberOfPages
10
n16:doi
10.1016/j.proeps.2014.06.011
n17:hasPublisher
ELSEVIER SCIENCE BV
n20:organizacniJednotka
11310