595 GLE / G&G 595
FIELD METHODS IN APPLIED AND ENGINEERING GEOPHYSICS
Final Project Due: December 17th, 2008 A construction company has won a bid to construct a fiber optic cable network for the city of Madison. This company has hired you as a geophysical consultant to map an area where a 3-m depth, 3-m wide and 5-m long excavation needs to be built to install a manhole for the inspection and maintenance of the proposed network. The construction company has certain flexibility in the placement of the manhole, therefore it has asked you to use gravity, magnetic, seismic reflection and refraction, electrical resistivity and GPR surveys to obtain a good image of the underground. With the information that you will provide, the engineers will decide where and how the manhole will be constructed. You consulted with utility companies and they have informed you that in the area, there are a concrete (diameter pipe 1.00 m) that belongs to the sewer system and a cast iron pipe (diameter 0.3 m) that carries drinking water. The geological maps also indicate that there is a clean sand layer (approx. 2.5 m thick) above a highly plastic clay layer (approx. 5 m thick) that rest on a weathered granite formation.
N Cast iron pipe
Plan view
Concrete pipe
Sand Saturated sand
1.5 m
Water table Cast iron pipe (depth 2m)
1.0 m
5.0 m
Concrete pipe (depth 5.5 m)
Saturated clay
Weather granite
You are asked to design all surveys and conc...