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Blast-Induced Liquefaction And Downdrag Development On A Micropile Foundation, Cameron Mark Lusvardi
Blast-Induced Liquefaction And Downdrag Development On A Micropile Foundation, Cameron Mark Lusvardi
Theses and Dissertations
Frequently, deep foundations extend through potentially liquefiable soils. When liquefaction occurs in cohesionless soils surrounding a deep foundation, the skin-friction in the liquefied layer is compromised. After cyclical forces suspend and pore pressures dissipate, effective stress rebuilds and the liquefied soil consolidates. When the settlement of the soil exceeds the downward movement of the foundation, downdrag develops. To investigate the loss and redevelopment of skin-friction, strain was measured on an instrumented micropile during a blast-induced liquefaction test in Mirabello, Italy. The soil profile where the micropile was installed consisted of clay to a depth of 6m underlain by a medium …
Performance Of A Full-Scale Rammed Aggregate Pier Group In Silty Sand Based On Blast-Induced Liquefaction Testing In Emilia-Romagna, Italy, Paul Joseph Walsh Andersen
Performance Of A Full-Scale Rammed Aggregate Pier Group In Silty Sand Based On Blast-Induced Liquefaction Testing In Emilia-Romagna, Italy, Paul Joseph Walsh Andersen
Theses and Dissertations
To investigate the liquefaction mitigation capability of Rammed Aggregate Piers® (RAP) in silty sand, blast liquefaction testing was performed at a soil profile treated with a full-scale RAP group relative to an untreated soil profile. The RAP group consisted of 16 piers in a 4x4 arrangement at 2 m center-to-center spacing extending to a depth of 9.5 m. Blasting around the untreated area induced liquefaction (ru ≈1.0) from 3 m to 11 m depth, producing several large sand boils, and causing settlement of 10 cm. In contrast, installation of the RAP group reduced excess pore water pressure (ru ≈0.75), eliminated …
Development Of A Simplified Performance-Based Procedure For Assessment Of Liquefaction Triggering For The Cone Penetration Test, Jenny Lee Blonquist
Development Of A Simplified Performance-Based Procedure For Assessment Of Liquefaction Triggering For The Cone Penetration Test, Jenny Lee Blonquist
Theses and Dissertations
Soil liquefaction can cause devastating damage and loss and is a serious concern in civil engineering practice. One method for evaluating liquefaction triggering potential is a risk-targeted probabilistic approach that has been shown to provide more consistent and accurate estimates of liquefaction risk than traditional methods. This approach is a “performance-based” procedure which is based off of the performance-based earthquake engineering (PBEE) framework developed by the Pacific Earthquake Engineering Research (PEER) Center. Unfortunately, due to its complexity, performance-based liquefaction assessment is not often used in engineering practice. However, previous researchers have developed a simplified performance-based procedure which incorporates the accuracy …