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Partial Safety Factors for Hydraulic Conductivity Requirements of Granular and Geotextile Filters

Shubham, KA and Sivakumar Babu, GL (2023) Partial Safety Factors for Hydraulic Conductivity Requirements of Granular and Geotextile Filters. In: 2023 Geo-Congress: Sustainable Infrastructure Solutions from the Ground Up - Foundations, Retaining Structures, and Geosynthetics, 26- 29 March 2023, Los Angeles, pp. 476-485.

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Official URL: https://doi.org/10.1061/9780784484685.048


The presence of a filter media impedes water flow in terms of generating excess pore pressure and decreasing the flow rate of the soil-filter system compared to the flow rate in soil. Therefore, the hydraulic conductivity requirement includes excess pore pressure and flow rate requirements. Different criteria for granular and geotextile filters are currently developed empirically based on experimental investigations. This paper proposes an analytically derived design criterion for the hydraulic conductivity requirements for granular and geotextile filters. The derivation has shown that the hydraulic conductivity requirements of pressure head and flow rate are satisfied with a sole condition of hydraulic conductivity of filter greater than or equal to the hydraulic conductivity of soil times the hydraulic gradient in soil. The coefficient of variation of saturated hydraulic conductivity is often greater than 50, reflecting a need to quantify the uncertainty in the design criterion. Therefore, partial safety factors are developed for the proposed criterion to quantify the variabilities of hydraulic conductivities of soil and filter such that the requirement is satisfied at targeted reliability.

Item Type: Conference Paper
Publication: Geotechnical Special Publication
Publisher: American Society of Civil Engineers (ASCE)
Additional Information: The copyright for this article belongs to American Society of Civil Engineers (ASCE).
Keywords: Flow of water; Flow rate; Geotextiles; Safety factor; Soils, Design criteria; Excess pore pressure; Filter; Filter mediums; Geosynthetics; Geotextile filters; Granular filter; Partial safety factor; Permeability; Water flows, Hydraulic conductivity
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 25 May 2023 03:39
Last Modified: 25 May 2023 03:39
URI: https://eprints.iisc.ac.in/id/eprint/81523

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