A twenty-story hospital building with a 400 ft × 200 ft footprint is to be built on a site underlain by fill over glacial sands. The building will have a 25-ft deep basement and will probably be supported on either a mat foundation located 5 ft below the bottom of the basement, or a deep foundation extending about 100 ft below the bottom of the basement. The groundwater table is about 30 ft below the ground surface and bedrock is about 120 ft below the ground surface. There are no accessibility problems at this site. (a) How many exploratory borings will be required as per NYC Code, and to what depths should they be drilled?

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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A twenty-story hospital building with a 400 ft x 200 ft footprint is to be built
on a site underlain by fill over glacial sands. The building will have a 25-ft
deep basement and will probably be supported on either a mat foundation
located 5 ft below the bottom of the basement, or a deep foundation
extending about 100 ft below the bottom of the basement. The groundwater
table is about 30 ft below the ground surface and bedrock is about 120 ft
below the ground surface. There are no accessibility problems at this site.
(a) How many exploratory borings will be required as per NYC Code,
and to what depths should they be drilled?
(b) How would you obtain groundwater data? Explain your answer.
Transcribed Image Text:A twenty-story hospital building with a 400 ft x 200 ft footprint is to be built on a site underlain by fill over glacial sands. The building will have a 25-ft deep basement and will probably be supported on either a mat foundation located 5 ft below the bottom of the basement, or a deep foundation extending about 100 ft below the bottom of the basement. The groundwater table is about 30 ft below the ground surface and bedrock is about 120 ft below the ground surface. There are no accessibility problems at this site. (a) How many exploratory borings will be required as per NYC Code, and to what depths should they be drilled? (b) How would you obtain groundwater data? Explain your answer.
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