236 



RETAINING WALLS. 



CHAP. V. 



no reinforcing is required. However, f in. D bars were placed 18 in. centers and 3 in. from the 

 bottom of the foundation. 



Data. The coefficients of friction of various materials are given in Table I. The angles of 

 repose of different materials are given in Table II. The conditions of surface and amount of 

 moisture cause wide variations in the coefficients. Additional data for the design of retaining 

 walls are given in Tables III to VI. 



TABLE I. 

 COEFFICIENTS OF FRICTION. 



TABLE II. 

 ANGLES OF REPOSE, <j>, FOR MATERIALS. 



TABLE III. 

 ALLOWABLE PRESSURE ON FOUNDATIONS. 



TABLE IV. 

 ALLOWABLE PRESSURE ON MASONRY. 



