Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

Civil Engineering SSC JE (Technical)

Civil Engineering (CE) : Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

The document Shear Strength of Soil Civil Engineering (CE) Notes | EduRev is a part of the Civil Engineering (CE) Course Civil Engineering SSC JE (Technical).
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Chapter 9
Shear Strength of Soil

SHEAR STRENGTH
Shear strength of a soil is the capacity of the soil to resist shearing stress. It can be defined as the maximum value of shear stress that can be defined as the maximum value of shear stress that can be Mobilized within a soil mass.

 Shear Strength of Soil Civil Engineering (CE) Notes | EduRev
-Plane a -a is critical plane
c = Angle of critical plane (a – a)
1 and σ3 are stresses on given planes

(i) 
        Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

where, βmax = Angle between resultant stress and normal stress on critical plane=Friction angle of soil = ∅ 

Shear Strength of Soil Civil Engineering (CE) Notes | EduRev     
 for clay, ∅= 0
      Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

(ii)  Shear Strength of Soil Civil Engineering (CE) Notes | EduRev , for sands or Φ -soil.


(iii)Shear Strength of Soil Civil Engineering (CE) Notes | EduRev, for C- Φ soil.


(iv) Shear Strength of Soil Civil Engineering (CE) Notes | EduRev, for C-soil (clays).


(v) Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

for C-∅  soil.


(vi)Shear Strength of Soil Civil Engineering (CE) Notes | EduRev, for Φ soil.
 (vii) σ1= 2C , for C– soil.

 Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

MOHR COULOMBS THEORY
Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

where, C’ = Effective Cohesion
Shear Strength of Soil Civil Engineering (CE) Notes | EduRev = Effective normal stress and ∅' = Effective friciton angle

 Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

DIRECT SHEAR TEST:

Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

 Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

UNCONFINED COMPRESSION TEST

-qu = (σ1)f
where, qu = unconfined compressive strength.
Here, σ3= 0
Shear Strength of Soil Civil Engineering (CE) Notes | EduRev
- (σ1)f =2C , for C-soil
 -Shear Strength of Soil Civil Engineering (CE) Notes | EduRev  for clay’s or C-soil.

VANE SHEAR TEST:
-It is suitable for sensitive clays.

 Shear Strength of Soil Civil Engineering (CE) Notes | EduRev
Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

 Lab sizeField Size
Height of vane (H)20 mm10 to 20 cm
Dia of vane (D)12 mm5 to 10 cm
Thickness of vane (t)0.5 to 0.1 mm2 to 3 cm


Shear Strength:
Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

-When top and bottom of vanes both pertain in shearing.
 Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

-When only bottom of vanes pertain in shearing.
 Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

where Sf = Sensitivity 

PORE PRESSURE PARAMETER:
Shear Strength of Soil Civil Engineering (CE) Notes | EduRev 

where,
B = Pore pressure parameter
ΔUc = Change in pore pressure due to in crease in cell pressure
Δσ= Δσ3 = Change in cell pressure.
-0 ≤ B ≤ 1
-B = 0, for dry soil.
-B = 1, for saturated soil.

(ii) 
Shear Strength of Soil Civil Engineering (CE) Notes | EduRev
where A = Pore pressure parameter
Shear Strength of Soil Civil Engineering (CE) Notes | EduRev

where ,
 ΔUd = Change in pore pressure due to deviator stress.
 Δσd = Change in deviator stress

 (iii) ΔU=ΔUc +ΔUd
ΔU = change in pore pressure
(iv)

 Shear Strength of Soil Civil Engineering (CE) Notes | EduRev


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