EOSC 210 Final Test Questions with Correct Answers

EOSC 210 Final Test Questions with Correct Answers what are some types of concrete dams - Answer- gravity, arch, buttress, concrete-face (hybrid) what are some pros to concrete dams - Answer- rigid offer more resistance to water erosion, overtopping and piping failure can be shaped to support imposed loads, reduce tensile stresses and minimize concrete usage (thin arch dams) what are some cons to concrete dams - Answer- concrete is relatively expensive somewhat more labor intensive than earth dams concrete has low tensile strength making it susceptible to differential settlements requires appropriate sources of sand and gravel aggregate for concrete gravity dams - Answer- use bulk weight and low center of gravity to hold back water. can be built across long distances over relatively flat terrain (most applicable in non-mountainous regions) entire load concentrated on foundation buttress dams - Answer- use multiple reinforced columns to support a dam that has a relatively thin structure uses 1/2 as much concrete limited height can be considered even if the foundation materials are a bit weaker buttress - Answer- a support that transmits a force from a roof or wall to another supporting structure arch dams - Answer- utilize the strength of an arch to displace the load of water behind it on its abutments use less material than gravity dams but are a lot more expensive only built when walls of a canyon are unquestionalbly stable and impervious to seepage around the dams as this could cause failure where are arch dams usually located - Answer- narrow, deep river gorges what are the requirements for a dam foundation - Answer- adequate strength and low compressibility impermeable enough to prevent excessive loss of water from the reservoir (low to moderate transmissivity)