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Experimental Studies on Effect of Load Repetition on Dynamic Characteristics of Saturated Ahmedabad Cohesive Soil

  • Saloni Pandya
  • Ajanta SachanEmail author
Research Paper
  • 21 Downloads

Abstract

The present study investigates the hysteresis response, stiffness degradation/cyclic softening and energy dissipation features of Ahmedabad cohesive soil. Saturated specimens of Ahmedabad cohesive soil were reconstituted using slurry consolidation technique at different void ratios to perform the following series of tests, strain-controlled cyclic triaxial tests, shear strength, and compressibility tests. Load repetition exhibited significant degradation in shear modulus of slurry consolidated cohesive soil specimens under cyclic loading conditions. A maximum stiffness degradation of 78% was observed for the specimen possessing minimum initial void ratio. Hysteresis response of Ahmedabad soil revealed alteration in the rotation angle of hysteresis loops and their sizes with varying initial void ratios of the Ahmedabad cohesive soil. A substantial influence of initial void ratio on the energy dissipation behavior of cohesive soil was depicted in the present study. The cumulative energy dissipation of the specimen prepared with lower initial void ratio was obtained to be 7.1 times higher than the specimen possessing maximum initial void ratio.

Keywords

Hysteresis response Stiffness degradation Energy dissipation Cyclic triaxial Slurry consolidation Cohesive soil 

List of Symbols

G

Shear modulus

D

Damping ratio

CH

Clay with high compressibility

ρdi

Initial dry density

ei

Initial void ratio

Cc

Compression index

εa

Axial strain

σd

Deviatoric stress

σ′v

Effective vertical stress

cu

Undrained cohesion

qu

Unconfined compression strength

υ

Poisson’s ratio

wi

Initial water content

δ

Cyclic degradation index

δS1

Cyclic degradation index of specimen S1

δS2

Cyclic degradation index of specimen S2

δS3

Cyclic degradation index of specimen S3

δS4

Cyclic degradation index of specimen S4

N

Number of loading cycles

G1

Shear modulus of the soil at the first cycle of loading

\({G_N}\)

Shear modulus of the soil at the Nth cycle of loading

LL

Liquid limit

PL

Plastic limit

SL

Shrinkage limit

d

Diameter

h

Height

DFSI

Differential free swell index

W

Energy dissipation at the end of each cycle

ΔWT

Cumulative energy dissipated at the end of each test

Notes

Acknowledgements

Financial support from IIT Gandhinagar is gratefully acknowledged. Any opinions, findings and conclusions or recommendations expressed in this material are those of authors and do not necessarily reflect the views of IIT Gandhinagar.

Funding

The research is funded by IIT Gandhinagar (IITGN001).

Compliance with Ethical Standards

Conflict of Interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Copyright information

© Iran University of Science and Technology 2019

Authors and Affiliations

  1. 1.Civil EngineeringIIT GandhinagarGandhinagarIndia

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