Implementation of Measuring While Drilling Shafts in Florida (FLMWDS)

McVay, Michael; Rodgers, Michael; University of Florida, Gainesville. Engineering School of Sustainable Infrastructure and Environment (ESSIE)

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Implementation of Measuring While Drilling Shafts in Florida (FLMWDS)

2020-06-01
By McVay, Michael ; Rodgers, Michael

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English

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Details:

Creators:

McVay, Michael ; Rodgers, Michael

McVay, Michael ; Rodgers, Michael Less -
Corporate Creators:

University of Florida, Gainesville. Engineering School of Sustainable Infrastructure and Environment (ESSIE)
Corporate Contributors:

Florida. Department of Transportation
Subject/TRT Terms:

[+]

Compressive Strength Data Collection Drilled Shafts Drilling Florida Limestone Geostatistics Limestone Measuring Methods Measuring While Drilling Quality Assurance Quality Control Rocks Shaft Capacity Shaft Sinking Specific Energy
Resource Type:

Tech Report
Geographical Coverage:

Florida
Edition:

Final Report, 01/2018 – 06/30/2020
Corporate Publisher:

Florida. Department of Transportation
Abstract:

Measuring while drilling (MWD) is the application of monitoring and recording drilling data during the drilling process. Recent geotechnical MWD efforts have shown that specific energy obtained from MWD can be directly correlated to the unconfined compression strength (qu) of rock. This is advantageous as foundations and structures supported by rock commonly use qu in their design. For this research, MWD was conducted during the excavation of drilled shafts at two independent sites, Selmon Parkway in Tampa and County Road 250 in Dowling Park, Florida. At both sites, rock drilling buckets were used to excavate the shafts. This required a new correlation to be developed between specific energy and qu for the unique drilling tools. This was accomplished using mobilized side shear data collected from load tests at Selmon Parkway, and the correlation was subsequently used to estimate rock strength at County Road 250. At both sites, data obtained from core samples and MWD were used to assess the site variability. It was concluded that conventional site investigation methods are limited to properly assess site variability, whereas the MWD approach significantly increases the number of strength assessments collected and can provide a correlation structure from a single sampled location, identify areal trends to quantify layering and zonal issues, and reduce the spatial uncertainty at each shaft location. These findings indicate MWD can be used to properly assess site variability and provide quality assurance/quality control (QA/QC) during shaft construction; both of those will improve resistance factors used in design and lead to a reduction in cost per shaft.
Format:

PDF
Funding:

BDV31-977-91
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:0b37573729219a6e45dd998fd86cc8122c8e81d6fe6033144249ccd6d8300ca3
Download URL:

https://rosap.ntl.bts.gov/view/dot/56367/dot_56367_DS1.pdf
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Implementation of Measuring While Drilling Shafts in Florida (FLMWDS)

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