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Caltrans – Evaluation of Soil Plug Geotechnical Resistance in the Design of CISS Piles

    CSI has collaborated with Caltrans to deploy a distributed fiber optic sensing technology, specifically Distributed Strain Sensing (DSS) and Distributed Temperature Sensing (DTS) to quantify the effect of Cast-In-Steel Shell (CISS) pile soil plugging on pile capacity. The construction processes of Cast-In-Steel Shell (CISS) piles and the soil-pile at different stages can be depicted in the following figure. It is hypothesized in this study that the evaluation of pile performance based on the response of the soil during pile driving (Stage A) may not reflect the actual performance of the pile during the actual structure loading due to complex soil-pile interactions that occur during soil plug removal and concreting (Stage B to D). This study aims to compare the pile test data with pile resistances calculated using API and Model 3 design procedures. Based on the comparison, a design method will be developed for determining the geotechnical resistance of the pile with varying soil plug thickness. A series of pile loading tests will be performed for the investigation.

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    Collaborator: US Army Corps of Engineers, Engineer Research and Development Center (USACE-ERDC)

    Researchers: Chuao Dong, Connor Geudeker, Sumeet Sinha, Wonjun Cha, Kenichi Soga, Adda Athanasopoulos-Zekkos (UC Berkeley)

    Domains: Transportation Infrastructure

    Capabilities: Distributed Fiber Optic Sensing (DFOS)

    Publications: TBA!