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A new building is proposed with a deep basement (10 meters below ground level) to be placed on rock. Borings indicated glacial till (4 meters deep on average) over shale. The shale is of varying hardness, so a seismic refraction survey was done. The results showed the shale has a seismic velocity of less than 1 km/sec except for a 30 cm thick layer at 8 meters below the surface. The seismic velocity of that layers is 3.5 km/sec. Provide a couple of recommendations for dealing with this layer. (Note that the shale can support the building without any structural issues.)

A new building is proposed with a deep basement (10 meters below ground level) to be placed on rock. Borings indicated glacial till (4 meters deep on average) over shale. The shale is of varying hardness, so a seismic refraction survey was done. The results showed the shale has a seismic velocity of less than 1 km/sec except for a 30 cm thick layer at 8 meters below the surface. The seismic velocity of that layers is 3.5 km/sec. Provide a couple of recommendations for dealing with this layer. (Note that the shale can support the building without any structural issues.)

Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter12: Subsurface Exploration
Section: Chapter Questions
Problem 12.11P
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A new building is proposed with a deep basement (10 meters below ground level) to be placed on rock. Borings indicated glacial till (4 meters deep on average) over shale. The shale is of varying hardness, so a seismic refraction

survey was done. The results showed the shale has a seismic velocity of less than 1 km/sec except for a 30 cm thick layer at 8 meters below the surface. The seismic velocity of that layers is 3.5 km/sec. Provide a couple of recommendations for dealing with this

layer. (Note that the shale can support the building without any structural issues.)

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