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Undrained Shear Strength of Plastic Silt Subject to Blast-Induced Excess Pore Pressures
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2021-12-01
[PDF-4.92 MB]
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Alternative Title:Undrained Shear Strength of Plastic Silt Subject to Blast-Induced Excess Pore Pressures: Bridge Section [Project Title from Cover]
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Edition:Final Report
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Abstract:This research report evaluates the undrained shear strength of plastic silts soils subject to raised excess pore pressures such as those resulting from strong ground motion. The knowledge of the possible reduction in undrained shear strength of soils is useful for planning and executing construction of transportation infrastructure subject to earthquake shaking. The results of this study showed that for excess pore pressures equal to 12.6 to 17.5% of the in situ vertical effective overburden stress, the plastic silt deposit forming the subject of this investigation resulted in a loss of undrained shear strength ranging from 44 to 50%. The post-blasting undrained shear strength associated with the raised excess pore pressure field was determined equal to the initial, residual undrained shear strength as observed using the vane shear test.
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