Geological influence in the index properties variability and shear strength probability density functions

Soil properties variability in geotechnical engineering is one of the most important tasks in reliability-based designs (RBDs). However, these analyses have been carried without taking into account the influence of the geological origin in the different aspects that alter the soil properties variabi...

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Bibliographic Details
Published in:Quarterly journal of engineering geology and hydrogeology 2021-11, Vol.54 (4)
Main Authors: Viviescas, Juan C, Osorio, Juan P, Pastén, Cesar
Format: Article
Language:English
Subjects:
Bayesian analysis
Compressive strength
Debris flow
density
design
dynamic properties
Engineering geology
experimental studies
field studies
fine-grained materials
Fine-grained soils
friction
Geology
Geotechnical engineering
laboratory studies
Mudflows
penetration tests
probability
Probability density functions
Probability theory
reliability
Reliability analysis
Reliability engineering
Residual soils
Shape
Shear strength
Soil analysis
Soil density
Soil dynamics
soil mechanics
Soil properties
statistical analysis
uncertainty
Variability
Weathering
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Summary:Soil properties variability in geotechnical engineering is one of the most important tasks in reliability-based designs (RBDs). However, these analyses have been carried without taking into account the influence of the geological origin in the different aspects that alter the soil properties variability. Therefore, two types of geological formations are analysed: residual soils (stationary origin) and mudflows (dynamic origin). First, the index properties variability was evaluated for each geology, where mudflows are less variable in comparison with the residual soils. It was confirmed that the correlations of the effective friction angle should not be used for high plasticity and fine-grained soils; however, the shape characteristics of the Probability Density Functions (PDF) of both effective and total parameters depends on the geological origin. The undrained compressive strength (qu) analyses show that geology influences the shape characteristics of the PDF and is directly proportional to the (N1)60 PDF. From the results, mudflows present a qu PDF with a lognormal tendency, which is inferred to be due to the possible presence of rock fragments and randomness related to the soil's formation. However, the residual soils, under the same state of weathering tend to have a normal qu PDF, possibly due to the stationary origin of these soils. Supplementary material: https://doi.org/10.6084/m9.figshare.c.5420240
ISSN:1470-9236
2041-4803
DOI:10.1144/qjegh2020-093