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Influence of geogrid reinforcement on dynamic characteristics and response analysis of Panki pond ash

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Abstract

In the present study, pond ash from Panki thermal power plant, India (seismic zone III), has been reinforced with geogrid layers and the influence of reinforcement on dynamic shear modulus, material dam** ratio, degradation index and resistance to liquefaction of pond ash samples has been investigated. The static and dynamic properties of ash samples without and with geogrid reinforcement have been determined by laboratory experiments. Further, these properties have been used in the dynamic response analysis of the two-dimensional domain of the Panki pond ash deposit that is pond ash column reinforced without and with geogrid. The OpenSees (Open System for earthquake engineering simulation) software is used to perform the analysis. Three moderate magnitude earthquakes (Chamba, Chamoli and Uttarkashi) of Himalayan origin have been considered to study the variations of acceleration, displacement and excess pore water pressure ratio with time for different layers of pond ash columns without and with geogrid reinforcement. Cyclic triaxial experiments show that due to the provision of geogrid reinforcement, the dynamic shear modulus increases about 13% to 81.6% and the liquefaction resistance increases about 91–162%. The dynamic response analysis shows that for geogrid-reinforced pond ash column, the peak ground acceleration (PGA) value decreases about 32–33%, 17–22% and 13.5–18% and the peak ground displacement (PGD) value decreases about 23.5–39%, 18.5–20% and 13–17% as compared to unreinforced pond ash column for Chamba, Chamoli and Uttarkashi earthquakes, respectively.

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Abbreviations

2D:

Two-dimensional

c´:

Cohesion

Cc :

Coefficient of curvature

Cu :

Coefficient of uniformity

CU :

Consolidated undrained

D10 :

Size than 10% of the particles are finer

D30 :

Size than 30% of the particles are finer

D60 :

Size than 60% of the particles are finer

D:

Material dam** ratio

DOF:

Degree of freedom

Esec :

Secant Young’s modulus

EPPR :

Excess pore pressure ratio

Gsec :

Dynamic shear modulus

G1 and Gn :

Dynamic shear modulus of 1st and nth cycle

K:

Bulk modulus

k:

Coefficient of permeability

NL :

Number of loading cycles

OpeenSees :

Open System for Earthquake Engineering Simulation.

PGA:

Peak ground acceleration

PGD:

Peak ground displacement

ε :

Axial strain

δ:

Degradation index or shear degradation

γ and β:

Newmark parameters

γd max :

Maximum dry unit weight

μ :

Poisson’s ratio

ɸ:

Angle of internal friction

σd :

Deviatoric stress

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Acknowledgements

This research was carried out at the Indian Institute of Technology (IIT) Kanpur, India, an autonomous institute of higher education under the Ministry of Human Resource and Development (MHRD), Government of India. The authors acknowledge the support received from IIT Kanpur.

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The authors declare that no funds, grants or other support were received during the preparation of this manuscript.

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All authors contributed to the study conception and design. Experimental program and numerical analysis were performed by SC. The first draft of the manuscript was written by SC all authors read and approved the final manuscript.

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Correspondence to Swaraj Chowdhury.

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Chowdhury, S., Patra, N.R. Influence of geogrid reinforcement on dynamic characteristics and response analysis of Panki pond ash. Nat Hazards 119, 435–461 (2023). https://doi.org/10.1007/s11069-023-06136-1

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  • DOI: https://doi.org/10.1007/s11069-023-06136-1

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