Total Unit Weight Question - Need Help!!!!

[owillis28]

A soil sample has moisture content of 20% and degree of saturation of 80%. The specific gravity of the soil is 2.68. The total unit weight is most nearly

A) 100 lbf/ft3

B) 110 lbf/ft3

C) 120 lbf/ft3

D) 130 lbf/ft3

 

[Suns Den]

Ans. C

e = 0.67

Unit Wt total = 120 lbf/ft3

 

[owillis28]

Suns Den-

A couple of questions for you:

1) What equation(s) did you use?

2) Can you post your solutions showing your work?

3) Do you ever sleep at night? (noting post from 3 o'clock this morning)

owillis

 

[cantaloup]

Suns Den-
A couple of questions for you:

1) What equation(s) did you use?

2) Can you post your solutions showing your work?

3) Do you ever sleep at night? (noting post from 3 o'clock this morning)

owillis

Rho = (1+omega) x rho(water) / ( omega / deg of Sat + 1/SG )

 

[Suns Den]

Suns Den-
A couple of questions for you:

1) What equation(s) did you use?

2) Can you post your solutions showing your work?

3) Do you ever sleep at night? (noting post from 3 o'clock this morning)

owillis

Well... I just realized you were looking for help on this question, I took it as a practice problem...nd I did get some sleep

Here we go...

eqn's used

Se=wGs --- eq 1

gs= (Gs+Se) gw/(1+e) --- eq 2

g=gama

use eqn 1 to get void ratio (0.67) nd plug that in eq 2 to get the total unit weight (~120 lbf/ft^3).

Cans eqns will work just fine too.