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Influence of Compaction Method and Effort on Electrical Resistivity and Volume Change of Cohesive Soils

  • Geotechnical Engineering
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Abstract

Engineered fills are enhanced by compaction to reduce compressibility and permeability. In-situ application of shallow densification methods involve static method with the use of compaction rollers. However, the compaction characteristics of soils are traditionally obtained in the laboratory using dynamic compaction method. Due to the difference in the mechanism of the two compaction methods, there is a variation in the soil fabric formed, quantification of which is scarce. In this research, influence of compaction effort and (dynamic and static) compaction methods on swell and compressibility of two soils of diverse geological formation are investigated. An indirect means of measuring microstructural changes in specimen characteristics using electrical resistivity is also investigated. Results indicate that the compaction effort and the method of compaction have a significant impact on the electrical resistivity and swelling potential. The yield stress of the compacted specimens is also influenced. However, the compressibility and rebound behaviour upon unloading, are obtained to be independent of both the compaction effort and the method of compaction.

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Abbreviations

A :

Cross-sectional area of the compacted specimen

D 50 :

Mean particle size diameter

d p :

Distance between electrodes

e :

Specimen Void ratio

E n :

Achieved compaction effort

ER :

Electrical resistivity

ER sat :

Resistivity of the saturated soil

ER w :

Resistivity of pure fluid

g :

Gravitational acceleration

Gs:

Specific gravity

h D :

Compaction hammer drop height

H m :

Mold height

I :

Electrical current

K e :

Kinetic energy during the impact

LL:

Liquid limit

L p :

Required penetration length

m :

Cementation factor

m h :

Mass of the compaction hammer

m ws :

Mass of the wet soil

n :

Porosity

N b :

Number of blows per layer

N l :

Number of layers

PI:

Plasticity index

PL:

Plastic limit

Sr :

Specimen saturation ratio

Sr opt :

Specimen saturation ratio at compaction optimum water content

V :

Compaction mold volume

V d :

Voltage drop and

w c :

Specimen gravimetric water content

\({w_{{c_{opt}}}}\) :

Compaction optimum water content

ΔV :

Measured voltage

ρ bulk :

Bulk density of the compacted specimens

Ω:

Resistor capacity

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Correspondence to Bashar Alibrahim.

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Alibrahim, B., Uygar, E. Influence of Compaction Method and Effort on Electrical Resistivity and Volume Change of Cohesive Soils. KSCE J Civ Eng 25, 2381–2393 (2021). https://doi.org/10.1007/s12205-021-0419-9

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  • DOI: https://doi.org/10.1007/s12205-021-0419-9

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