but there may be another root smaller than tliis. In the case of the pile 

 designed fq r irdni miun length where T = 3705 pounds per foot of wall, the 

 quantity Vl2d T'-^-9"»if ^'eet and a positive root does exist between d , = 8 

 and 9, If this value for d is substituted in equation li8, d is found 

 to be negative, which is impossible, 



366, However investigation shows that there is another I'oot very close 

 to d, =2, This root is the applicable solution. 



Substituting in the equation for d^ 

 2 



. ^ a „ '?3.o5 - h 



K 



■* lu76 feet. 

 The deadman dimensions and pla.cement are shown on Figure lliu 



367, Sheet Pile Deadraan. - If the backfill is not dependable for 

 passive resistance, a sheet pile deadman, or one which depends on active 

 as well as passive pressures must be used. The analysis for a deadman 



of this t3rpe is similar to the analysis of the loxrer part of the pile wall 

 designed for niiniimim moment, (See Figure 115) 



368, By summing forces and moments about K as done previously, d, 

 is given by 



[d^ (Pl + Pk-) - 2T' - 2p^ [d^^ (Pj^ - 2pj^) - 6T' (d^^ - d^ ■<- d,^5J (137) 



d and d are given by 

 m o ' "^ 



d 



^ ^d ^Pk * ^l'^ 



- 2T' 



d 







, 2Pl 





(138) 



(139) 



The majdmum negative and raaxiiimm positive moments in the pile are re- 

 spectively 



M^ = UL^Jji X l^pj. + R^ (d^ - dji (lliO) 



178 , 



