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Capacity of Rock Socketed Drilled Shafts in Mid-Atlantic Region
Drilled shafts socketed into bedrock are a common foundation type for support of heavily loaded buildings and bridges in the Mid-Atlantic region of the United States. Along the region, the underlying bedrock of the Wissahickon Formation within the Piedmont Physiographic Province is often present about 10 to 100 feet below the ground surface and overlain mainly by silty residual soils and disintegrated rock. The underlying bedrock mainly consists of gneiss and schist. Two load tests were performed for drilled shafts socketed into bedrock and disintegrated rock in Maryland using the Osterberg load cell and in accordance with ASTM D - 1143 (Quick Test). The objective of the paper is to determine the drilled shaft capacities socketed into rock using field load test data and to compare the results with capacities calculated from empirical correlations. The Reese & O'Neill and Carter & Kulhawy methods were used for estimation of the drilled shaft capacity. The total ultimate capacities from the load tests were about 25% to 50% less than those predicted using the Reese & O'Neill and Carter & Kulhawy empirical methods. However, the total ultimate capacities were close to that of the capacities observed from the load tests, when the skin friction was calculated assuming disintegrated rock layer as Intermediate Geomaterials (IGM).
Capacity of Rock Socketed Drilled Shafts in Mid-Atlantic Region
Drilled shafts socketed into bedrock are a common foundation type for support of heavily loaded buildings and bridges in the Mid-Atlantic region of the United States. Along the region, the underlying bedrock of the Wissahickon Formation within the Piedmont Physiographic Province is often present about 10 to 100 feet below the ground surface and overlain mainly by silty residual soils and disintegrated rock. The underlying bedrock mainly consists of gneiss and schist. Two load tests were performed for drilled shafts socketed into bedrock and disintegrated rock in Maryland using the Osterberg load cell and in accordance with ASTM D - 1143 (Quick Test). The objective of the paper is to determine the drilled shaft capacities socketed into rock using field load test data and to compare the results with capacities calculated from empirical correlations. The Reese & O'Neill and Carter & Kulhawy methods were used for estimation of the drilled shaft capacity. The total ultimate capacities from the load tests were about 25% to 50% less than those predicted using the Reese & O'Neill and Carter & Kulhawy empirical methods. However, the total ultimate capacities were close to that of the capacities observed from the load tests, when the skin friction was calculated assuming disintegrated rock layer as Intermediate Geomaterials (IGM).
Capacity of Rock Socketed Drilled Shafts in Mid-Atlantic Region
Hossain, Sahadat (author) / Omelchenko, Victor (author) / Haque, Mohamed A. (author)
Geo-Denver 2007 ; 2007 ; Denver, Colorado, United States
2007-10-14
Conference paper
Electronic Resource
English
Capacity of Rock Socketed Drilled Shafts in Mid-Atlantic Region
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