EXAM 1 pt Flashcards
1
Q
Groundwater flow through soils fundamentals
A
Flow in soil is steady and incompressible
2
Q
Conservation of mass
A
q = v1A1 = v2A2 = contant
3
Q
Bernoulli Equation
A
Total head = velocity head + pressure head + elevation head
4
Q
Pressure Head
A
hp = p/gamma
5
Q
What is required for flow
A
Difference in total head
6
Q
Hydraulic Gradient
A
i = change in total head / length
7
Q
Darcy’s Law
A
v = ki q = Aki
8
Q
Hydraulic Conductivity
A
k Measures how well a soil will move through a soil k = gamma w / n (viscosity) * K Lower k will mean slower velocity Bigger k means faster and larger voids
9
Q
Seepage Velocity
A
vs = q / nA = v/n
10
Q
Where is head lost
A
Only through the soil
11
Q
Direction of flow
A
Higher to lower total head
12
Q
Constant Head Test
A
Darcys law experiment Apply constant heads at each end Constant gradient Coarse - Proctor Mold Fine - Flexible wall
13
Q
Falling Head Test
A
For fine soils with low k because q is difficult to measure
Modified odometer to measure q in reduced diameter
k = aL / A(t2-t1) * ln h1/h2
