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| Titel |
Water-induced granular decomposition and its effects on geotechnical properties of crushed soft rocks |
| VerfasserIn |
M. Aziz, I. Towhata, S. Yamada, M. U. Qureshi, K. Kawano |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 10, no. 6 ; Nr. 10, no. 6 (2010-06-17), S.1229-1238 |
| Datensatznummer |
250008230
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| Publikation (Nr.) |
 copernicus.org/nhess-10-1229-2010.pdf |
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| Zusammenfassung |
| The widespread availability of soft rocks and their increasing use
as cheap rockfill material is adding more to geotechnical hazards
because time-dependent granular decomposition causes significant
damage to their mechanical properties. An experimental study was
conducted through monotonic torsional shear tests on crushed soft
rocks under fully saturated and dry conditions and compared with
analogous tests on standard Toyoura sand. Due to the sensitivity of
material to disintegration upon submergence, saturated conditions
accelerated granular decomposition and, hence, simulated loss of
strength with time, whereas, dry test condition represented the
response of the soil with intact grains. A degradation index, in
relation to gradation analyses after each test, was defined to
quantify the degree of granular decomposition. Possible correlations
of this index, with strength and deformation characteristics of
granular soils, were explored. Enormous volumetric compression
during consolidation and monotonic loading of saturated specimens
and drastic loss of strength parameters upon submergence were
revealed. It is revealed that the observed soil behaviour can be
critical for embankments constructed with such rockfill materials.
Moreover, the enhanced ability of existing soil mechanics models to
predict time-dependent behaviour by incorporating water-induced
granular decomposition can simplify several in situ geotechnical
problems. |
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