Weathering and deterioration of geotechnical properties in time of groundmasses in a tropical climate

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Weathering and degradation of slope materials govern erosion and stability of slopes over time. Weathering is often ignored or over-simplified in engineering due to absence of time-series of material properties and uncertainty on future environment. The research in this paper investigates the rate of deterioration of geotechnical properties due to weathering over time after excavation of cut slopes in completely weathered material and residual soil in a tropical environment. Three cut slopes are studied with different excavation dates but with similar geological, geotechnical and groundwater conditions, identical slope aspect, and land cover. Index and strength properties are determined by field and laboratory tests. The results show that the hydro-mechanical properties of completely weathered material in cut slopes evolve very rapidly to those of residual soil within time spans of 30 to 90 years in a tropical-humid environment. The properties reduce so much that instability of cutslopes is inevitable if this reduction is not taken into account during design and excavation of the slopes. Change of strength properties is around 1.1 to 1.3%pt. per year from the original completely weathered material strength at the time of excavation. This is based on simplified linear and logarithmic relationships. The deterioration of geotechnical properties is likely the main reason for many slope failures in cut slopes after many years of stability
in the research area of Yên Bái City in Vietnam.
Original languageEnglish
Article number105221
Pages (from-to)1-15
Number of pages15
JournalEngineering geology
Volume260
Early online date4 Jul 2019
DOIs
Publication statusPublished - 3 Oct 2019

Fingerprint

geotechnical property
Weathering
Excavation
Deterioration
weathering
excavation
Soils
tropical environment
residual soil
Groundwater
Time series
Erosion
Materials properties
humid environment
Degradation
Mechanical properties
tropical climate
slope failure
mechanical property
land cover

Keywords

  • Time
  • Cut slope
  • Deterioration
  • Hydro-mechanical
  • Weathering
  • Yên Bái
  • ITC-ISI-JOURNAL-ARTICLE

Cite this

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title = "Weathering and deterioration of geotechnical properties in time of groundmasses in a tropical climate",
abstract = "Weathering and degradation of slope materials govern erosion and stability of slopes over time. Weathering is often ignored or over-simplified in engineering due to absence of time-series of material properties and uncertainty on future environment. The research in this paper investigates the rate of deterioration of geotechnical properties due to weathering over time after excavation of cut slopes in completely weathered material and residual soil in a tropical environment. Three cut slopes are studied with different excavation dates but with similar geological, geotechnical and groundwater conditions, identical slope aspect, and land cover. Index and strength properties are determined by field and laboratory tests. The results show that the hydro-mechanical properties of completely weathered material in cut slopes evolve very rapidly to those of residual soil within time spans of 30 to 90 years in a tropical-humid environment. The properties reduce so much that instability of cutslopes is inevitable if this reduction is not taken into account during design and excavation of the slopes. Change of strength properties is around 1.1 to 1.3{\%}pt. per year from the original completely weathered material strength at the time of excavation. This is based on simplified linear and logarithmic relationships. The deterioration of geotechnical properties is likely the main reason for many slope failures in cut slopes after many years of stabilityin the research area of Y{\^e}n B{\'a}i City in Vietnam.",
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author = "Tran, {T. V.} and D. Alkema and H.R.G.K. Hack",
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Weathering and deterioration of geotechnical properties in time of groundmasses in a tropical climate. / Tran, T. V.; Alkema, D.; Hack, H.R.G.K.

In: Engineering geology, Vol. 260, 105221, 03.10.2019, p. 1-15.

Research output: Contribution to journalArticleAcademicpeer-review

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