Tag Archive for Tag: Retaining Wall

Tag: Retaining Wall Lateral Earth Pressure retaining wall problem example 1

A gravity retaining wall is required to be designed for seismic conditions for the active state. The following data are given: Solution From Eq. (11.79) For all practical purposes, the point of application of Pae may be taken as equal to H/2 above the base of the wall or 4 m above the base in this case.

View Article...

Tag: Retaining Wall Effect of Wall Lateral Displacement on the Design of Retaining Wall

It is the usual practice of some designers to ignore the inertia forces of the mass of the gravity retaining wall in seismic design. Richards and Elms (1979) have shown that this approach is unconservative since it is the weight of the wall which provides most of the resistance to lateral movement. Taking into account all the seismic forces acting

View Article...

Tag: Retaining Wall Coulomb’s Earth Pressure Theory for Sand for Active State

Coulomb made the following assumptions in the development of his theory: 1. The soil is isotropic and homogeneous 2. The rupture surface is a plane surface 3. The failure wedge is a rigid body 4. The pressure surface is a plane surface 5. There is wall friction on the pressure surface 6. Failure is two-dimensional and 7. The soil is

View Article...

Tag: Retaining Wall Retaining wall problem example 5

A rigid retaining wall 19.69 ft high has a saturated backfill of soft clay soil. The properties of the clay soil are ysat = 111.76 lb/ft3, and unit cohesion cu = 376 lb/ft2. Determine (a) the expected depth of the tensile crack in the soil (b) the active earth pressure before the occurrence of the tensile crack, and (c) the

View Article...

Tag: Retaining Wall Retaining wall problem example 4

Find the resultant thrust on the wall in prob. Ex. 3 if the drains are blocked and water builds up behind the wall until the water table reaches a height of 2.75 m above the bottom of the wall. Solution For details refer to Fig. 11.15. Per this figure,

View Article...

Tag: Retaining Wall Retaining wall problem example 2

A wall of 8 m height retains sand having a density of 1.936 Mg/m3 and an angle of internal friction of 34°. If the surface of the backfill slopes upwards at 15° to the horizontal, find the active thrust per unit length of the wall. Use Rankine’s conditions. Solution There can be two solutions: analytical and graphical. The analytical solution can be

View Article...

Tag: Retaining Wall Rigid retaining wall problem example

A rigid retaining wall 5 m high supports a backfill of cohesionless soil with 0= 30°. The water table is below the base of the wall. The backfill is dry and has a unit weight of 18 kN/m3. Determine Rankine’s passive earth pressure per meter length of the wall (Fig. Ex. 11.5). Solution

View Article...

Tag: Retaining Wall Vertical back Retaining wall problem example

A retaining wall with a vertical back of height 7.32 m supports a cohesionless soil of unit weight 17.3 kN/m3 and an angle of shearing resistance 0 = 30°. The surface of the soil is horizontal. Determine the magnitude and direction of the active thrust per meter of wall using Rankine theory. Solution For the condition given here, Rankine’s theory disregards the friction

View Article...

Tag: Retaining Wall Cantilever retaining wall problem example

A cantilever retaining wall of 7 meter height (Fig. Ex. 11.2) retains sand. The properties of the sand are: e = 0.5, 0 = 30° and Gs = 2.7. Using Rankine’s theory determine the active earth pressure at the base when the backfill is (i) dry, (ii) saturated and (iii) submerged, and also the resultant active force in each case.

View Article...