Partial Safety Factors for Hydraulic Conductivity Requirements of Granular and Geotextile Filters
Publication: Geo-Congress 2023
ABSTRACT
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.
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Geo-Congress 2023
Pages: 476 - 485
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Published online: Mar 23, 2023
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