Pile Design for Downdrag: Examples and Supporting Materials (2024) / Chapter Skim
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Appendix C: Design Example 1 - Embankment Fill Over Clay Using Hand Calculations
Pages 73-96

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From page 73...
... PI L E N E G pr o gr a m, w er e r ef er e n c e d f or t h e D esi g n E x a m pl e Pr o bl e m 1 t h at is pr es e nt e d h er ei n. Pr o c e d ur es f or d et er mi ni n g t h e l o c ati o n of t h e n e utr al pl a n e a n d m a g nit u d es of t h e dr a g l o a d a n d d o w n dr a g ar e d e m o nstr at e d usi n g 1)
From page 74...
... I nf err e d or i nt er p ol at e d Pil e S h a p e O ct a g o n al p ar a m et ers usi n g Pil e F a c e [ m m]
From page 76...
... T a bl e C 2.
From page 77...
... . T h e u n dr ai n e d s h e ar str e n gt h v al u es w er e d et er mi n e d b y c o n v erti n g t h e pr o vi d e d Bri a u d a n d T u c k er ( 1 9 9 7)
From page 78...
... . s ettl e m e nt pr ofil e pr es e nt e d i n Fi g ur e C 3 w as d e v el o p e d f or p oi nts b el o w t h e c e nt er of t h e e m b a n k m e nt usi n g t h e Ost er b er g e m b a n k m e nt str ess distri b uti o n , w hi c h ass u m es a s y m m etri c g e o m etr y , a n d pr o vi d e d h alf of t h e a ct u al str ess i nfl u e n c e ( Fi g ur e C 4 a n d E q u ati o ns 2 t hr o u g h 4)
From page 79...
... at e a c h s u bl a y er d e pt h (z) is t h e n d et er mi n e d b y m ulti pl yi n g t h e i nfl u e n c e f a ct or wit h t h e b e ari n g pr ess ur e ( q =γ fillH fill= 1 1 7 k P a)
From page 80...
... E x a m pl e Pr o bl e m 1 d esi g n e x a m pl e. T h e i n cr e m e nt al si d e r esist a n c e w as d et er mi n e d b y usi n g t h e t ot al str ess a n al ysis " α m et h o d " b e c a us e t h e u n dr ai n e d s h e ar str e n gt h (s u )
From page 81...
... as s h o w n i n Fi g ur e C 6,  z = v erti c al c o ns oli d ati o n str ai n,  = v erti c al s ettl e m e nt of i n di vi d u al s u bl a y er;   (fr o m b ott o m t o t o p) = s ettl e m e nt pr ofil e ( Fi g ur e C 5)
From page 82...
... o bt ai n e d f or e a c h s u bl a y er. St e p 5: D e v el o p a d e pt h -d e p e n d e nt l o a d pr ofil e T h e d e pt h -v ar yi n g l o a d pr ofil e is d e v el o p e d b y d et er mi ni n g t h e c u m ul ati v e l o a d i n t h e pil e, as a f u n cti o n of d e pt h.
From page 83...
... 5 0 1 2 2. 4 8 z = l a y er mi d p oi nt d e pt h, σ z o ' = v erti c al eff e cti v e str ess, su = u n dr ai n e d s h e ar str e n gt h, α = t ot al str ess si d e r esist a n c e v al u e, f n = n o mi n al u nit si d e r esist a n c e, F s =s u bl a y er si d e r esist a n c e.
From page 84...
... a) L o a d pr ofil e gr a p h f oll o wi n g dri vi n g, b)
From page 85...
... 0 9 4 8 7 9. 0 9 Q A D = l o a d i n pil e aft er dri vi n g, Q w U T L = l o a d i n pil e wit h a d diti o n of u nf a ct or e d t o p l o a d 85
From page 86...
... St e p 7: D e v el o p t h e d e pt h - de p e n d e nt c o m bi n e d l o a d pr ofil e f or t h e pil e T h e c o m bi n e d l o a d a n d r esist a n c e pr ofil e gr a p h f or t h e pil e a n al y z e d f or t h e e x a m pl e pr es e nt e d h er ei n is pr es e nt e d i n Fi g ur e C 7. T h e c o m bi n e d l o a d pl ot b e gi ns at t h e t o p of t h e pil e a n d f oll o ws t h e l o a d c ur v e u ntil t h e i nt ers e cti o n wit h t h e r esist a n c e c ur v e t h e n f oll o ws t h e r esist a n c e c ur v e u ntil t h e t o e of t h e pil e is r e a c h e d.
From page 87...
... C al c ul at e d r e si st a n c e a s a f u n cti o n of d e pt h. L a y er D e pt h z R R = r esist a n c e fr o m s oil [ m]
From page 88...
... B as e d o n t h e c al c ul ati o ns, t h e dr a g l o a d w as d et er mi n e d t o b e 2 8 6 k N
From page 89...
... Fi g ur e C 9. C al c ul at e d dr a g l o a d fr o m c o m bi n e d l o a d-r e si st a n c e pr ofil e.
From page 90...
... of t h e pil e is d et er mi n e d usi n g E q u ati o n 1 1. T h e c u m ul ati v e el asti c c o m pr essi o n i n t h e pil e is t h e n d et er mi n e d b y a c c u m ul ati n g e a c h of t he el asti c c o m pr essi o n v al u es fr o m t h e b ott o m of t h e pil e t o t h e t o p of t h e pil e ( E q u ati o n 1 2)
From page 91...
... 0 0 0 5 0. 0 2 0 4 c o m pr essi o n (fr o m 4.
From page 92...
... Als o pr es e nt e d i n Fi g ur e C 1 1 is t h e D a viss o n M et h o d li n e t h at w as us e d t o d et er mi n e t h e n o mi n al a xi al g e ot e c h ni c al r esist a n c e ( 2 8 0 0 k N)
From page 93...
... F or t h e str u ct ur al str e n gt h li mit st at e, t h e d et er mi n e d dr a g l o a d ( 2 8 6 k N) w as m ulti pli e d b y t h e dr a g l o a d f a ct or (γ D R = 1.
From page 94...
... 0 6 0 3 0. 0 7 7 4 E p = pil e el asti c 6.
From page 95...
... C o n cl usi o n: H a n d c al c ul ati o ns w er e p erf or m e d t o d et er mi n e t h e a m o u nt of dr a g l o a d a n d d o w n dr a g o n a pil e b ei n g s u bj e ct e d t o a c h a n g e i n eff e cti v e str ess fr o m a n e m b a n k m e nt.
From page 96...
... " R e p ort o n P h as e II M et h o d ol o g y a n d D esi g n Pr o c e d ur es I nt eri m D eli v er a bl e " N C H R P 1 2 -1 1 6 A Pr oj e ct D eli v er a bl e.


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