One Dimesional Seepage. Sand ? supported on ous disc and screen in verti al c nd

Question

One Dimesional Seepage.

Sand ? supported on ous disc and screen in verti al c nder and is n o cond tions is 0.7. (Gs-2.7) rum condton. Assume the sand above evo hos completely dry and belo s complete y satu ted le oassume that the vo d 0 ? he sand in both satur ed and dry (Point A is in the middle of saturated soil layer. Also h is the distance between point B and the water table.) S 090 AleS_ 100%; (a) Determine Total stress the stresses in kPa at point C Pore water pressure: Effective stress (b) Determine the stresses in kPa at point B Total stress Pore water pressure Effective stress (c) Deterine the stresses in kPa at point A: Total stress Pore water pressure: Effective stress

Explanation / Answer

For dry sand e= 0.7, Ybulk = Gs Yw/(1+e) = 2.7*10/1.7 = 15.88 KN/m3

For saturated sand e= 0.7, S=1, eS=wGs thus w= 0.259 say 0.26

Thus Ybulk = Gs Yw(1+w)/(1+e) = 2.7*10*1.26/1.7 = 20.011 KN/m3 say 20 KN/m3

Thus at point C

Total stress = 0

Pore water pressure = 0

Effective stress = total stress - pore water pressure = 0

At point B

Total stress= 15.88*2= 31.76 KN/m2 or 31.76 KPa

Pore water pressure = 0

Effective stress = 31.76 KN/m2 or 31.76 KPa

At point A

Total stress= 15.88*2+20*1= 51.76 KPa

Pore water pressure = 10*1= 10KPa

Effective stress= 41.76 KPa

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