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

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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.

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Abbreviations

G :

Shear modulus

D :

Damping ratio

CH:

Clay with high compressibility

ρ di :

Initial dry density

e i :

Initial void ratio

C c :

Compression index

ε a :

Axial strain

σ d :

Deviatoric stress

σ′ v :

Effective vertical stress

c u :

Undrained cohesion

q u :

Unconfined compression strength

υ :

Poisson’s ratio

w i :

Initial water content

δ :

Cyclic degradation index

δ S1 :

Cyclic degradation index of specimen S1

δ S2 :

Cyclic degradation index of specimen S2

δ S3 :

Cyclic degradation index of specimen S3

δ S4 :

Cyclic degradation index of specimen S4

N :

Number of loading cycles

G 1 :

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

ΔW T :

Cumulative energy dissipated at the end of each test

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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).

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Authors and Affiliations

  1. Civil Engineering, IIT Gandhinagar, Palaj, Gandhinagar, Gujarat, India

    Saloni Pandya & Ajanta Sachan

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  1. Saloni Pandya
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  2. Ajanta Sachan
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Correspondence to Ajanta Sachan.

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Pandya, S., Sachan, A. Experimental Studies on Effect of Load Repetition on Dynamic Characteristics of Saturated Ahmedabad Cohesive Soil. Int J Civ Eng 17, 781–792 (2019). https://doi.org/10.1007/s40999-019-00392-8

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  • DOI: https://doi.org/10.1007/s40999-019-00392-8

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