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Estimation of Small-Strain Shear Modulus of Embankment Soils Before Construction Using Bender Elements in Compaction Test

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Abstract

Design of railway track and highways on embankments with compacted fills often needs the value of small-strain shear modulus of the fill soil to be known before construction. This paper presents a new method of determining the value of G max using bender elements within the mould of laboratory compaction test which is generally performed to decide specifications of field compaction before construction. This method is much easier to perform and simulates the field conditions closely. A design mould configuration is suggested after due consideration to near-field effect and rigid boundary effect during wave propagation in the compaction mould. This process of wave propagation is also simulated using 3-D finite element model in ABAQUS to study the effect of aspect ratio of mould for different values of Poisson’s ratio of compacted soil. Accordingly, the testing procedure is laid out for bender element test after compaction of soil in the mould and applying vertical load to simulate the overburden expected at different depths of embankments. Using the proposed test procedure, the value of G max has been measured at different overburden values for several soil samples. The collected G max data is used to look at overburden effect and how it can be applied in design.

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Abbreviations

G max :

Small-strain shear modulus

V s :

Shear wave velocity

ρ :

Density of soil

L :

Distance between source and receiver

λ :

Wavelength of input signal

µ :

Poisson’s ratio

V p :

P-wave velocity

t p :

Travel time for p-wave

t s :

Travel time for s-wave

R :

Radius of the mould

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Acknowledgments

This study was conducted after discussions with the RDSO, Lucknow. We gratefully acknowledge the financial support and the test samples provided by them. The support from IIT Kanpur in conducting the experiments and analysis is appreciated.

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Authors and Affiliations

  1. Civil Engineering, Indian Institute of Technology Gandhinagar, Gandhinagar, India

    Amit Prashant & Prajakta R. Jadhav

  2. Civil Engineering, Indian Institute of Technology Kanpur, Kanpur, India

    Himanshu Kotak

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  1. Amit Prashant
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  2. Himanshu Kotak
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  3. Prajakta R. Jadhav
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Correspondence to Amit Prashant.

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Prashant, A., Kotak, H. & Jadhav, P.R. Estimation of Small-Strain Shear Modulus of Embankment Soils Before Construction Using Bender Elements in Compaction Test. Indian Geotech J 47, 208–217 (2017). https://doi.org/10.1007/s40098-016-0191-9

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