Biot's coefficient as an indicator of strenght and porosity reduction Calcareous sediments from Kerguelen Plateau
Hedegaard, Kathrine Borre, Mai Kristine Alam, Mohammad Monzurul
Biot's coefficient as an indicator of strenght and porosity reduction Calcareous sediments from Kerguelen Plateau - feb. 2010 - 16 p. ; 282-297
Transcripción del resumen del autor. Chalk develops as a result of diagenesis of pelagic calcareous ooze. In a newly deposited ooze sediment, porosity ranges from 60% to 80% but porosity reduces with burial. We studied how different porosity reduction mechanisms change the strength of these deep sea carbonate-rich sediments and effect Biot's coefficient, ß. In calcareous ooze, ß is one. Mechanical compaction reduces porosity, but only leads to a minor decrease in ß. Recrystallization renders particles smoother, but does not lead to reduction in ß unless it gives rise to pore stiffening cementation. Pore stiffening cementation causes ß to fall, even when porosity remains constant. Biot's coefficient correlates with strength-indicating properties: compressional and shear modulus, oedometer modulus, yield strength, strain from direct loading and creep strain. Our data indicate that ß may be used for predicting the diagenetic process involved in porosity reduction and strengthening of chalk during burial diagenesis.
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Biot's coefficient as an indicator of strenght and porosity reduction Calcareous sediments from Kerguelen Plateau - feb. 2010 - 16 p. ; 282-297
Transcripción del resumen del autor. Chalk develops as a result of diagenesis of pelagic calcareous ooze. In a newly deposited ooze sediment, porosity ranges from 60% to 80% but porosity reduces with burial. We studied how different porosity reduction mechanisms change the strength of these deep sea carbonate-rich sediments and effect Biot's coefficient, ß. In calcareous ooze, ß is one. Mechanical compaction reduces porosity, but only leads to a minor decrease in ß. Recrystallization renders particles smoother, but does not lead to reduction in ß unless it gives rise to pore stiffening cementation. Pore stiffening cementation causes ß to fall, even when porosity remains constant. Biot's coefficient correlates with strength-indicating properties: compressional and shear modulus, oedometer modulus, yield strength, strain from direct loading and creep strain. Our data indicate that ß may be used for predicting the diagenetic process involved in porosity reduction and strengthening of chalk during burial diagenesis.
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