بسم الله الرحمن الرحيم

Retaining Wall المجموعة :- أعضاء

عطاونة ماهرقباجة السالم عبد

االسطة حسين

. اشرف الجوالني :- نبيل د

Definition of retaining wall

Retaining Wall

Angle of repose

 

Retaining walls terminology -:

Typical dimensions of different types of retaining walls

:-Type of Retaining wallGravity retaining wall

Cantilevered retaining wall

Counter fort retaining wall

Precast concrete retaining wall

Precast concrete crib retaining wall

Sheet pile wall

• Gravity retaining walls

• Cantilevered retaining wall

• Counter fort retaining wall

• Precast concrete retaining wall

Bolt

down

Cast i

n

Heavy

duty

Freestandi

ng

Cast in Bolt down

Freestanding Heavy duty

• Precast concrete crib retaining wall

• Sheet pile wall

:-Drainage system of retaining walls

Factors and considerations in the -:design of retaining walls

• Nature & type of soil• Height of water table • Subsoil water movements• Type of wall• Material used in the construction of the wall

Forces acting on a retaining wall -:

Pressure at rest

Active earth pressure

Passive earth pressure

Pressure at rest-:

 :-Active earth pressure

. 

:-Passive earth pressure

 

diagrams of forces acting on a retaining wall

There is five Modes of failure

Sliding Failure

Overturning Failure

Bearing capacity Failure

Shallow shear Failure

Deep shear Failure

Sliding Failure

Sliding failure is nothing but sliding of wall away from backfill when there is shearing failure at the base of wall

The Factor of safety against sliding is:-

R Of resultant Vertical & horizontal components-:RV &RH

of weight of wall & earth pressure

µ = coefficient of friction = tan δ

Overturning failureOverturning failure is rotation of wall about its toe due to exceeding of moment caused due to overturning forces to

resisting forces

:-The Factor of safety against overturning is given by

= sum of resisting moment about toe = sum of overturning moment about toe

Bearing capacity failure :-

The pressure exerted by resultant vertical force at toe of wall must not exceed the allowable bearing capacity of the soil , the pressure distribution is assumed to be linear

The maximum pressure is given by:

:The Factor of safety against bearing failure is

Shallow shear failure

Deep shear failure

case study

Retaining wall failure in Austria on 30th October 2012

Thank you for listening