Experimental Research on Deformation Characteristics of Piled Raft Foundation under Flexible Load
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(2) ,: 31 Key words:flexible load;pileraft foundation;longtime insitu test;deformation mechanism;excess. !1 ". #$% & '()*+,-./0123456(789:. pore water pressure Ù>mQÚ/ v/ ÛÜ. ±ÝÞßÂà*áâ, ãºä1å [ ] , Åæ Ý Þ = ç è é c ê ë e、ì í e、 CFG e、îe]ïðQ1TUñòóôRS [ ]. Ðõö÷¥øùbcd, ïðQ1¨ úÀe [ ] 1èKûüýþÿ! ,"Á_#Á_eè [ ] &',yz()*/+e K$%ýþÿ! , [ ],ºîef f1,-.v、Q1RS [] /Á_01, 23Ðef1, å45,6 }ÁÂ*、 Óa¥/、 ¿À_7]O8, 9}ø:; <Ñù¥{-ÝÞ=>, ?@ABeCK [ ] * Mij . efghQ1ùcÌÍ{D/+Q1RS, ¸E4JF<~¹+`a bcdef®·yzzGLH、 ob_Iÿ! [ ] . A×*ef¿À®·ghQ1 ³S]L -.()J1gh,+op¸¦,º`a KjL、 MÑ®·NÁÂOPÝÞQR] Å}Ã*¬, =ç1ST^_`abcd efghQ1²¥ijOUijÝÞ³S4 JÃV, W}4J*X)SY§、Z[\ 12. 36. 7. 8. 910. 1. 11. 1216. ,. 、 、 , Q1TUñò9ô_,þbcdZ “eÓ [] Д O8. N.§efghQ1eijÝÞ ³S, )Z[#kl,efghQ1 AQ1fóô±Q1、Q1 、 Q1 MijQ1m¡¢£¤¥]k,) ¦§g°±efghQ1ijOU, ]]^ ºòoo_ yzzGLH ®·`¥. [910,1718]óô§ la±efgh ÓaO_] 19. NefghQ14Jyz¯h±TUij.. 1 STBCUV 1. 1 BCW>XYZ kl/ vmn^Qopqrstu Q juvw.. ,. ,. :. xyðwxz{ [QQ9N 1 |}3~st¸ Q4al _mm. () ( ) 、 , Ç 29 m. (2)M}3~st¸(Q )_m<Ñ m、 , Q1mÀµ 1 . al 3. [ 1 >%\]^_`aP Tab. 1 Physicomechanical indexes of subsoil . .  /m. 、 (1) m、 0 ~ (1)1 Q 5. 9 Q 0~ (2) m 8. 5 Q m、 0 ~ (3) m 10. 4 m、0. 3 ~ (4) Q 9. 9 Q m、 0 ~ (4)2 m 5. 9 (5) Q m > 24. γ/ kN m - 3. ω /%. (·). Q4al m 3. 1 ~ 26. 7 m 9. 9 al 4. al 4. al 4. al 4. al 4. al 3. :. _ . e. _ . Фu / °. (). Cu / kPa. a v 0. 10. 2 E s 0. 10. 2 E s 0. 20. 3 E s 0. 30. 4 E s 0. 40. 8 q c / MPa - 1 / MPa / MPa / MPa / MPa / MPa 6. 95. 8. 09. 11. 46. — 1. 74 — — — 6. 67 — — 8. 58 11. 70 — 1. 79 7. 71 9. 65 — — — 10. 19. 0. 20. 5. 85. 8. 32. 9. 76. 0. 32. 9. 01. 10. 12 10. 79 14. 98 2. 79. 19. 90. 0. 77 20. 59 0. 46 12. 54 38. 96. 0. 15. 5. 61. 22. 8. 20. 49. 0. 64. 6. 53. 0. 49 32. 33 18. 50. 0. 20. 10. 97. 25. 6. 20. 00. 0. 72. 7. 57. 0. 51 27. 37 14. 99. 0. 31. 8. 73. 26. 2. 20. 07. 0. 74 17. 17 0. 53 12. 60 28. 56. 0. 15. 5. 58. 24. 2. 20. 07. 0. 69. 0. 44 29. 10 27. 82. 0. 30. 24. 8. 20. 11. 0. 73 18. 91 0. 41 14. 73 36. 37. 25. 9. 19. 86. 0. 76 23. 03 0. 35 17. 09 53. 80. 6. 07. ;. ; ; ; ; 0. 1 ~ 0. 2 MPa @mÀ¤;E N¤¥ D 0. 1 ~ 0. 2 MPa @mÀ¤Ø. Qd£! r¡¢£NÌ, Ç 0. 8 ~ 2. 9 m, ² ¡_ µ 1 - ω N£ γ N e N¡¢¦ Ф u N` C u N ¥ a v 0. 10. 2 N ¤ ¥ D s 0. 10. 2. /. 2. 21. ,. £OP ÌÍ1²*¢£eQµ££¤. 1. 2 BCWbcYZ. ,. kl^Ð¥¦ÂN 14. 2 ~ 52. 6 m S/ 6. 3 ~ 7. 3 m §¨<ÑS/9© 8. 2 m. NÝÞo. ,. ,. c ªJ§[-« 4 ¬®¯²¥yzÌ.
(3) ; < = > ? @ @ A. 32. ,. Íécîeef®·Q1óôRS. eN PHC A500 °±ù¥îe e² 0. 5 m e4³N 18 ~. ! 52 B. ¹ÀÁJM D}[ÉÇ 1. 5 m S/1,M ÊgËa/ 6. 9 m klǦµ 2 .. ,. , 20 m, ´µMe«¶ 2. 2 ~ 2. 4 m(§[^ 2. 4 m、 ª f/éc C30 ·¸¹ºm, 0. 5 m; J^ 2. 3 m); 1 , ef/éc».L¼h½1 ¾ . f/ dy 0. 2 m êë¿, ÀÁJÐÂ1DAQ 1MóôS+, S/ 6. 6 ~ 7. 0 m. 1. 3 STBCUV kl^ÃÄÅ 3 Ækl\Ç, º-efg hQ1kÇ 2 Æ,eÈó. Q m、, AQ1kÇ 1 Æ (bN¦Ç ),1® ·yzµÇ¾ 2 . efghQ1¹ªJ DefghQ1MS+ ^§[^-« 4 ¬, Ð, kÇÅS/ 7. 0 m,AQ1kÇ. ,. N±4JefghQ1DÐ`abcd. ,. 、 、 ®·òo#Q1 Q1、Q1 MÐQ1¡¢£¤óôk,ÑÒÓKÎ ¾ 2 (a), º-: (1)Q1:DQ1y/ó ôQ1; (2)Q1:écÔ Ç1-¯óôQ1; (3)Q1 MÐ:écÕÔÇ DöÖRóôQ1 Mij; (4)Q1m¡¢£¤¥:DkÇ ijO_ 2ÌÌͺS+# ÍÎ#Ï. al 4. (a)f/. (b)e1 ¾ 1 efghQ1×¾ Fig. 1 Photo of pileraft foundation. . . . . . . .
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(6) . . . . . (b)ÀÁJAQ1 Fig. 2 . ,. (c)ªJefghQ1 m) ¾ 2 Q1Ǿ(Ø: Section of pileraft foundation of station(unit:m). . . .
(7) ,:. !1 ". 33. #$% & '()*+,-./0123456(789:. ,. y¡¢£¤zóô¡¢£¤¥. [ 2 BCdefghijk[ Tab. 2 Design parameter comparison of test sections Ëa RS / m  / m. S/ / m. RSLÙ. AQ1 N. 6. 9. åRS. ªJef ghQ1 M. 7. 0. îe + f/ e «¶ 2. 3 m f / 0. 5 m.. §[ef ghQ1 S. 7. 0. îe + f/ e «¶ 2. 4 m f / 0. 5 m.. kÇ. (). () (). ,. ¹ªJ^ ¸Êg±Ç 50% ûäüAý¼¹ AQ1oö.. 0. , ,. —. 2. 8. 18. , ,. 4. 1. 18. 5. 1. 4 lm?@no N±Q1ÚÛ¬óô±. ,. ¾ 3 Q1@p%J Fig. 3 Timehistory curves of settlement of foundation surface. ÜÝ ÄcÞ%Jóô±zG. ßàábQ. ,. 1â@«ã9cÞ%Jäåæ E LN. (1) ( ), T、 T fN±@çeèé@ç; S、 S f L-: t @ ç ù Ø;A 、B f N ê ¶ N t、 Õ. *L(1 )iëN t -t = A + B (t - t ). (2) S -S L(2 )µ¶,(t - t )/ (S - S )~ t - t 6}J _E, 9écJ_Ú¼ìíHîïð×ðó t ñL (1 )ò°ó Äc× S 、 ôzG. Úc, ô t @ ç Ø S,ó × ± Ú Û Ø, L(3 ), (3) S = S +1/ B . S = S0 +. [ 3 >%elmtjk[ Tab. 3 Comparison of settlement of foundation surface. T - T0 A0 + B 0 T - T0. 0. 0. 0. 0. Ç. -¯ `a / kPa. Ëa Ëa ÷G þt@ 12 Æ% / mm / mm c / mm. N. 131. 1. 120. 6. 134. 0. 134. 8. 0. 54. M. 193. 2. 28. 8. 32. 4. 32. 8. 0. 004 7. 0. ±ÚÛ ¬ / %. 0. 0. 0. AQ1efghQ1Q1µM. 0. ,. 0. 0. 0. 0. ∞. 0. 0. 0. 0. 2 BCpqMr 2. 1 >%eslmMr ¾ 3 NQ1@p%J¾ µ 3 Nïð. ,. Þ%JH÷GQ1e¬¦ õö. AQ1efghQ1Q1â` aÊg×Ê* AQ1Ø÷* º- N1. ,. ,. N3 DËa 12 Æ%CKfN 92. 9 134. 0 mm תJefghQ1 M1 M3 DËa. ;. ,. 12 Æ%CKfN 20. 8 32. 4 mm º Ø**»¼ ÇNAQ1 24% Ò¹`a. , ; ñøùÃ*, §[^efghQ1ñú*. µZ°¶ÿ¬ ¨!µM¬àñfÖ 61. 0 mm »¼Ü 0. 8 mm ¬ -¯ öÖ " ¬ ¶ # ¦ ñ f N 0. 54% . ,. ,. ). (. 0. 004 7% ¦¾¶efghQ16}à$ù. , 、 `¥Kbc, *Q1`a&ÆNÅK`aóô zGäðS. écL(4 )ábåéű¤ñòoöóô ÷G, î×'±¤ñòoödØóô ¦, ÷G°±¤ñò»¼ocbc. P P (4) s = ( β + )s , P P s Noc; P NÐ`a; P N`a; L-: P NÏ ( ) ` a;s N ;β N * þ t ¦+. x÷G, ªJefghQ1DËa±¤bcd CKØÇN 5 mm,¾¶Õa±¤»¼e fghQ1ocbc}~. Ïe()`a CKظ¹±¤`a¼, &'¹ef ¥K%¿I¥ èܱ»¼Q1 ÅÆQ1. l. g. z. z. g. z. g. g. l. z. z.
(8) ; < = > ? @ @ A. 34. ,. ®·,©ÁÂÊ*1, éÅÕa±¤»¼oc. ,. -øÃË å.Q1`a/Ód9åéű ¤ñò. 2. 2 >%MulmMr ¾ 4 NefghQ1@p%J¾ º 0-ðµ8.Â. ¾ 5 NAQ. ,. ,. 1efghQ1¦%J t = 0 d µ ÐS + þ t @ t = 480 d µ Ð S + þ t. ,. 480 d @. µ 4 NAQ1efghQ1 ð¦.. ! 52 B. ,. +p-Ø2 Êg S+þtcÊ34¹5 6 Q1-¯RD`aþbc 12 Æ%CK. , N 35. 4 mm. efghQ1ÌÍK¹dÎ eÈRN 31. 8 mm, ÇÏ 90% ; e , 3 ~ 4 mm , , ÈM7CK8¼ 9} Ï 10% , , :â@«;}¶ÿiÆ gh <¦e=>_¤Øú*. efghQ1¸¦, AQ1Ø÷ *, ©Ü 130 mm, :ÌÍK¹ 20 m Âøù`, ÇÏÜØ 80% . §[^efghQ1 Kª«ªJ^¸?, ûä§[^4L ?4LШ üAéc `añKÃ*, 23ïðQ1®·RS, Ö×ɧ[^Q1 êJ^÷*. ¨©Q1ª«¾¶îe ef®·¯/±ghijØyðÁÂ. 2. 3 >%wx?@Mr ¾ 6 NefghQ1 MÐK%J¾. ,. ¾ 7 NAQ1efghQ1 Mij¦¾.. . . . . . . . . . . . . . . . ¾ 4 efghQ1@p%J Fig. 4 Timehistory curves of layered settlement of pileraft foundation. . . . . . . . . . . . . . . . . . ,. . ¾ 5 å?å°Q1¦%J Fig. 5 Comparison curves of layered settlements of different foundations [ 4 >%vulmjk[ Tab. 4 Comparison of deep settlement of foundations Ç `a Ëaþt@Ø / kPa eÈM eÈd N 131. 1 88. 6 24. 0 M 193. 2. 4. 2. mm. Ëa 12 Æ%Ø eÈd 29. 7. 3. 5. 32. 0. ªJefghQ1â`aiƪ«. ,.
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(12) . ,. , ÐN 3. 2 mm, ÌÍK¹S+p-, î:gh MÐBÂiÆÃ¼. ªJ^oö¸¦, 4L, §[^MÑ`a*¹ªJ^; ?4L, § [ÐefghQ1¨ 4b7üAéc23 îegg¸¿TUñò (C¾ 2 (a )),e¥ µMÇÈÃD, ɧ[^1öÖkQ1 M Ð÷*, e¥àñN 4. 6 mm. AQ1 MÐ Kª«efghQ1¬Ã*,×:ñ÷ *, ºÚ* MÐF¹QµR, ñN 9. 5 mm. MijEMKâQiÆFGª«¶ÿ, À M¾ 20 m Âøù` MÐiÆÃ*. HYä Q1µ MÐ,IäeÈÂR MÐ,.
(13) . eÈM 99. 6. 25. 9. . ªJefghQ1 MÐÀMʼ Ú* MÐ@AQµ S+þt 440 d c Ú* M. . . . ¾ 6 efghQ1 MÐK%J Fig. 6 Distribution curves of lateral deformation of pileraft foundation. . . . Q1%Jª«41 Ð2ÀËaS.
(14) ,: efghQ1ŦAQ1¼, ¾¶ef®·9 !1 ". #$% & '()*+,-./0123456(789:. »¼Q1m MijeµMûüijCKJ g.. ¾ 7 å?å°Q1 MЦ%J Fig. 7 Comparison curves of lateral deformation of different foundations. 2. 4 >%yz?{Mr ¾ 8 NQ1Õ¡¤iÆ%J.. 35. ,. , º-AQ1Ú*(àñ mÕ¡¢£¤¥2 MM, N 13. 03 kPa), §[^efghQ1N" (àñN 7. 74 kPa ),ª J e f g h Q 1 Ú ¼ (à ñ N 3. 83 kPa). ,äÒ¹ef®·Â1ÓÔ±*Ñ Ð`a, Q1mÓ²±Ã¼`a¦+,2̪ JefghQ1¸AQ1ÂRÕ¡¢£¤¥ <NAQ1 29. 4% . S+þt`aþbc,Q 1mÕ¡¢£¤¥OPQú,ûä,Ò¹§[`a øùÃ*, J-¯£¤¥Qú²Å¦ºR^ , &'ºÕ¡¢£¤¥QúSÍÃ@«. ª JefghQ1Õ¡¤D 18 m ÂRÊú/ ¹ 5 m ÂR,Ú*ñfN 3. 7 1. 8 kPa,S + þ t 440 d c Õ ¡ ¤ f » ¼ ½ 0. 7 0. 4 kPa, fd±Ç 70% 60% . 3 ÆÇ Ö¨©Q1Õ¡¤%J¦TU, Õ¡¤uʼ, àñ9} 13. 0 kPa,ÇÏJgù¥ 30% . Ò¹Õ¡¤-裥V¼¹WX£ ¥VÂ, Q1måYCKZ[ÿ!Z\,û並 ×], AQ1CKÕ¡¤¦ghQ1*. Ò¾ 8 9K âLÐS+3 ×ò Q1. 3 p |. ,. 2Ì^mQefghQ1 ã. 、. 、 îAQ1o ¢£¤¥]`_#kob, öóô±.¦§, g°d®Y: (1)efghQ1`a*¹AQ1,ûäË aþtcº÷G<Nc! 24% `a,×: ¬Ò 0. 54% »¼Ü 0. 004 7% ,¾¶ef 1,èܱ»¼Q1、ÅÆQ1`¥K bc. (2)ef®·**»¼±ghQ1, efghQ1ÌÍK¹dÎ, ÇÏ , 90% ,AQ1ÌÍK¹Qµd 20 m øù`ª«å?. (3)HYäQ1µ MÐ,IäeÈ R MÐ, efghQ1ÇŦAQ1Ç ¼, ¾¶ef¿À®·9»¼Q1m Mi jeµMûüijCKJg. (4)efghQ1`aý*¹AQ1,ûä <NAQ1 ¸AÂRÕ¡¢£¤¥b÷¼, 29. 4% , ¾¶efgh³SäÐ`ac*Ñ Òef®·ÓÔ,Q1mӲʼ`a,Ö× ±Q1ij ij MС. (a)efQ1. (b)AQ1 ¾ 8 Q1Õ¡¤@p%J Fig. 8 Timehistory curves of excess pore water pressure of foundation. »¼±Q1Ø..
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