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Author:
Kirk McIntosh
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2000-03-10 |
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Does anyone know if documentation exists concerning the magnitude and rate of decay-related, non load-dependent settlement that can occur in a peat layer exposed to oxygen due to a drop in water table? The peat has an organic content of 60 to 90+%, is pre-consolidated to 1.5 to 3 ksf, and is currently below the water table, but a few feet (perhaps 4 feet) of the layer could become exposed due to drought conditions or lowering of the water table near new stormwater ponds to be constructed. The peat is covered by 5 to 10 feet of clean sand. We anticipate seasonal dry periods which could expose part of the peat to air for 6 months or more. Is there a reliable way to estimate this decay related settlement?
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Follow-up:
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Author:
K. Rainer Massarsch
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2000-03-24 |
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Hi Kirk,
this is one of the more complex questions so far. We have sometimes similar problems in Scandinavia, especially with organic silts and peats. These soils deteriorate rapidly when exposed to air.
I will listen to some experts here but would suggest that you are careful. Is there a way of making a simple test in the lab on extracted samples?
Would be interested to be kept informed about what you decided to do.
Regards,
Rainer
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to subject 'Geotechnical design and analysis'
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Follow-ups:
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Subject:
Decomposition Rate of Peat 