Soil Mechanics Problem in Flows of Water Through Soil
Fri, 02/05/2010 - 13:10
A drainage pipe became completely blocked during a storm by a plug of sand, 1.5 m long, followed by another plug of sand, 1.5 meters long, followed by another plug of a mixture of clay, silts, and sand 0.5 meter long. When the storm was over, the water level above ground was 1 meter. The hydraulic conductivity of the sand is 2 times that of the mixture of clays, silts, and sands.
a) Calculate the porewater pressure at (1) center of the sand plug & (2) center of the mixture of clay, sands, and silts
b) Find the average hydraulic gradient in the mixture of sand, silt, and clay
Note: Radius of the horizontal drainage pipe is 0.3 meters and the down pipe from the ground is 2meter just below the 1 meter water level above the ground.
Please answer and tell me how you got it. Thanks!
You can email me at albugeng_21@yahoo.com
S P O N S O R E D L I N K S
- 2398 reads
Fri, 02/05/2010 - 15:56
#1
Re: Soil Mechanics Problem in Flows of Water Through Soil
Guest wrote:
...and the down pipe from the ground is 2meter just below the 1 meter water level above the ground.
This portion is not clear, I suggest you Insert a sketch to make it clear. The Insert/edit image button is available when you logged in.
The porewater pressure is given by the formula
where:
= porewater pressure
= unit weight of water
= head of water
The hydraulic gradient is the ratio of head of water to length of soil where the water flows.
I hope it helps. If you have more questions, don't hesitate to ask.
By the way, its not good to post your email address in a public forum.
__________________
Sat, 04/17/2010 - 19:45
#2
Re: Soil Mechanics Problem in Flows of Water Through Soil
Is this a fictitous example? Or you are solving actual problem? If so, you need to install piezometer to actually measure the head. Then after you can back calculate the field permeability using the formula. You can do some sensitivity if you are designing something.
