Sliding Stability The factor of safety against sliding, FSSL , shall be determined by summing the resisting forces of the wall which act parallel to the base of the wall and dividing that sum by the summation of driving forces on the wall which act parallel to the base of the wall. The resisting forces typically consist of the normal force acting on the base of the wall times the coefficient of sliding resistance plus the component of force due to the weight of the wall and any surcharge loads acting on the wall which is parallel to the base of the wall. The normal force acting on the base of the wall consists of the component of force due to the weight of the wall and any surcharge loads acting on the wall which is normal to the base of the wall plus the component of the design lateral pressure acting on the pressure surface which is normal to the base of the wall. The coefficient of sliding resistance used to determine the frictional resistance at the base of the wall shall be as follows: • For prefabricated modular walls with cells which are filled with wall fill which are in contact with the foundation soil, the coefficient equals,Tan ø , at the base of the wall, where øis the friction angle of the wall fill or the foundation soil whichever is lowest. • For prefabricated modular walls the base of which consists of a continuous or near continuous surface of concrete, the coefficient equals,Tan 2/3 ø fn, whereøfn is the friction angle of the foundation soil. The summation of the driving forces acting on the wall typically consists of the component of the design lateral pressure acting on the pressure surface which is parallel to the base of the wall.
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