Culmann Graphical Method For Active And ive Case 5h5qu

In this method a retaining Wall is drawn to a suitable scale as shown in the Fig.1 below.

The Various steps in the procedure are: 

Draw ɸ-line AE at an angle ɸ with the horizontal.



Lay off on AE distances AV, A1, A2, A3 etc to a suitable scale to represent the weight of wedges ABV, AB1, AB2, AB3, and so on.



Lay off AD at an angle equal to (α- δ) to the line AE. The line AD is called pressure line.



Draw lines parallel to AD from points V, 1, 2, 3 to intersect the assumed lines AV, A1, A2, A3 at points V’, l’, 2’, 3’ etc respectively.



points V’, l’, 2’, 3’ etc by a smooth curve which is the pressure locus.



Select the point C’ on pressure locus such that the tangent to the curve is parallel to the ɸ-line AE.



Draw CC’ parallel to the pressure line AD. The magnitude of CC’ in its natural units gives the active pressure Pa.



AC’ and produce to meet the surface of the backfill at C. AC is the rupture line.

ive Case

In this method a retaining wall is drawn to a suitable scale as shown in the Fig.2 below.

The various steps in the procedure are: 

Draw ɸ-line AE at an angle ɸ below the horizontal.



Lay off on AE distances A2, A3, A4 etc to a suitable scale to represent the weight of wedges AB2, AB3, AB4, and so on.



Lay off AD at an angle equal to (α+ δ) to the line AE. The line AD is called pressure line.



Draw lines parallel to AD from points, 2, 3, 4 etc to intersect the weight vectors A2, A3, A4 at points 2’, 3’, 4’ etc respectively.



points, 2’, 3’, 4’ etc by a smooth curve which is the pressure locus.



Select the point C’ on pressure locus curve such that the line tangent to the curve is parallel to ɸline AE.



Draw CC’ parallel to the pressure line AD. The magnitude of CC’ in its natural units gives the ive pressure Pp.

AC’. The line cuts the surface of the backfill at C. The line AC is the rupture line.

http://bestengineeringprojects.com/civil-projects/culmann-graphical-method-for-active-and-ivecase/