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Experimental Research on Deformation Characteristics of Piled Raft Foundation under Flexible Load

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(1)& ' ( ) * + + , ! 52 " ! 1 # 2017 $ 2 % JOURNAL OF SOUTHWEST JIAOTONG UNIVERSITY. :. ( ). . Vol. 52 No. 1 Feb. 2017. :. .123 02582724 2017 01003008 DOI 10. 3969 / j. issn. 02582724. 2017. 01. 005. 4567)89:;<=>% ?@A5BCDE. ,. ,. ,. ,. 1 1 2 3 1 !"# $ % &'( ) * +,-. (1. &'()* + m n o p + q,r s t u 610031;2. - v ! r w x y z q { | } ~  €, ‚ ƒ „ ; , ). 430063 3. rs/ †‡yˆ‰Š€ rs tu 610041. :. ,. ,. F G ‹ŒŽmQefghQ1 )‘’“”#•–kl 4J^_`abcdefghQ1—˜A. 、. 、. ,. , : , Š®¯°±^_`abcdefghQ1™²¥ij³S. 4J®´µ¶ ef®·¸Œ¹˜AQ1 ºŠ›œ ¬­›œ»¼½ 0. 9% , ¾¶º¿ÀÁÂÃ*, }ĹůQ1`a、 ÇÈQ1 Mij, ÉQ1Š »¼½ 24% 、 ; , ; 90% ›œŸ¬­›œu}Ê*pÂœË efghQ1›œÌ͉K¹dΞ ϊ›œ™ †Ð`a*ѝ Òef®·ÓÔ, ef®·Q1-Õ¡¢£¤¥¸Œ¹˜AQ1œË± 70% , Ö×»¼±Q1›œØ. HIJ:^_`a; efghQ1; ’“”#kl; ij³S; Õ¡¢£¤¥ KLMN3:U213. 1 .OPQR:A. Q1™Q1šŠ›œ Q1ž›œŸ Mij Q1m¡¢£¤¥] Œ¦§¨©Q1ijª«™¬­_. Experimental Research on Deformation Characteristics of Piled Raft Foundation under Flexible Load. ,. ,. ,. ,. SHAO Guoxia1 SU Qian1 CHEN Shangyong2 BAI Hao3 WANG Wubin1. (1. School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;2. China Railway Siyuan Survey and Design Group Co. Ltd. ,Wuhan 430063 ,China;3. Sichuan Expressway Construction & Development Corporation,Chengdu 610041 ,China). :To study the pileraft foundation in thick soft clay ground,total settlements of foundation surface,layered settlements,lateral deformations,and pore water pressures of foundation soil for pile. Abstract. raft foundation and natural foundation were observed and analyzed by longtime insitu test. The load and deformation mechanism of pileraft foundation under flexible load was proposed by the comparative analysis of the deformation differences between the two types of foundations. The results show that the total settlement of pileraft foundation is reduced to be the 24% total settlement of the natural. , foundation has lager integral rigidity, which can homogenize the load and restrict the lateral deformation,and lead to the reduction in the total settlement and differential settlement. The settlement of the pileraft foundation in substratum is the main part of total settlement,which accounts for the 90% total settlement. The pileraft structure bears the most subgrade load. Compared with that of the natural foundation,the excess pore water pressure of the pileraft foundation is reduced by about 70% ;therefore,the settlement of foundation is reduced. foundation and the differential settlement is reduce to be 0. 9% . This means that the pileraft. !"#$ %&'( )*+, -./0. :20150618 :-./0123456789:;:<9=(2682015CX008EM);>?@A3+1;:<9=(51378441 ) :B>C(1975 — ),D,EFG,HI4JK,4JLMNOPQ1RSTU,VW:02887600996 ,Email:shaoguoxia@ 126. com :B>C,XY,Z[\,]. ^_`abcdefghQ1ijO_kl4J[J]. &'()*++,,2017 ,52 (1 ):3037. SHAO Guoxia,SU Qian,CHEN Shangyong,et al. Experimental research on deformation characteristics of piled raft foundation un der flexible load[J]. Journal of Southwest Jiaotong University,2017 ,52 (1 ):3037..

(2) ,: 31 Key words:flexible load;pileraft foundation;longtime insitu test;deformation mechanism;excess. !1 ". #$% & '()*+,-./0123456(789:. pore water pressure Ù>mQÚ‡/ v†Ÿ/ †ÛÜ. ±›œÝÞßÂà*™áâ, ãºä†1›œ—å [ ] , Åæ› œ Ý Þ = ç è é c ê ë e、ì í e、 CFG e、îe]ïðQ1TUñòóôRS [ ]. †Ðõö÷¥øùbcd, ïðQ1¨ ™úÀe [ ] 1è‰Kûüýþÿ! ,"Á_#Á_eè‰ [ ] &',yz()*/ž‡+e K$%ýþÿ! , [ ],ºîe—f f1,-.v†、†Q1RS [] /Á_01, —23™†Ðef1, å45,6 }ÁÂ*、 Óa¥/、 ¿À_7]O8, 9}ø:; <Ñù¥{-Ÿ›œÝÞ=>, ?@ABeCK‘ [ ] *™ Mij . efghQ1™ùcÌÍ{D/ž‡+Q1RS, ¸E4JF<~¹‡+`a bcdef®·™yzzGLH、 ob_IŸÿ! [ ] . A×*ef¿À®·ghQ1 ³S]Lš -.()J†1gh,—‡+op¸¦,º`a KjL、 MÑ®·NÁÂOPŸ›œÝÞQR] Å}Ã*¬­, =狌†1ST^_`abcd efghQ1™²¥ijOUŸijÝÞ³S4 JÃV, W}™4J*X)‘SY§、Z[\– 12. 36. 7. 8. 910. 1. 11. 1216. ,. 、 、 , Q1TUñò™9ô_,›œþbcdZ “eÓ [] Д ™O8. N.§efghQ1™›œeijÝÞ ³S, )‘Z[”#•–kl,‹ŒefghQ1 Ÿ˜AQ1fóô±Q1š›œ、Q1ž› œ、 Q1 MijŸQ1m¡¢£¤¥]–k,) ‘Œ¦§g°±efghQ1™›œijOU, ]]^ ‹Œºòoo_ yzzGLH ®·`¥. [910,1718]óô§ la±efgh ŸÓaO_] 19. NefghQ1™4J—yz¯h±TUij.. 1 STBCUV 1. 1 BCW>XYZ kl/ v†mn^Qopqrstu’ Q juvˆw.. ,. ,. :. xyðwxz{ [Q™Qž9N 1 |}3~st¸ Q4al €_mŸm. () ( ) 、 ‚ƒž, ŽÇ 29 m. (2)M„}3~st¸(Q )€_m<Ñ m、 ‚, Q1mÀ†‡ˆµ 1 ‰Š. al 3. [ 1 >%\]^_`aP Tab. 1 Physicomechanical indexes of subsoil ž‹. Œ. ŽÂ /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. :. Ž_ ‡. e. _ ‡. Фu / °. (). Cu / kPa. a v 0. 10. 2 E s 0. 10. 2 E s 0. 20. 3 E s 0. 30. 4 E s 0. 40. 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™¤š›‡;E N¤¥ D 0. 1 ~ 0. 2 MPa @mÀ™¤šœØ. Qd£! r›¡¢ž£NÌ, ŸÇ 0. 8 ~ 2. 9 m, ² ¡_ µ 1 - ω N’£“ γ N” e N¡¢¦ Ф u N` • – — C u N ˜ ™ ¥ a v 0. 10. 2 N ¤ ¥ D s 0. 10. 2. /. 2. 21. ,. œ£OP ÌÍ1²*¢œ£eQµ£™£¤. 1. 2 BCWbcYZ. ,. kl^†Ð¥š¦ÂN 14. 2 ~ 52. 6 m S/ 6. 3 ~ 7. 3 m §¨<ÑS/9© 8. 2 m. NÝÞo. ,. ,. c›œ ªJŸ§[-« 4 ¬­®¯²¥yzÌ.

(3) ; < = > ? @ @ A. 32. ,. Íécîeef®·ŒQ1óôRS. eN PHC A500 °±ù¥îe e² 0. 5 m e”4³N 18 ~. ! 52 B. ¹ÀÁJM D’}[ÉÇ 1. 5 m ™S/1,M ÊgËa/ 6. 9 m klǚŒ¦ˆµ 2 ‰Š.. ,. , 20 m, ´µMe«¶ 2. 2 ~ 2. 4 m(§[^ 2. 4 m、 ª f/éc C30 ·¸¹ºm, Ž 0. 5 m; J^ 2. 3 m); 1 , e—f/éc».L¼h½1 ˆ¾ ‰Š. f/ dy 0. 2 m Žê뿞, ÀÁJ†ÐÂ1D˜AQ 1MóôS+, S/ 6. 6 ~ 7. 0 m. 1. 3 STBCUV kl^ÃÄÅ 3 Ækl\–Çš, º-efg hQ1–kǚ 2 Æ,eÈó. Q m、‚ž, ˜AQ1–kǚ 1 Æ (bN¦ŒÇš ),†1® ·yzµÇšˆ¾ 2 ‰Š. efghQ1“¹ªJ DefghQ1MS+† ^Ÿ§[^-« 4 ¬­, Ð, –kǚÅS/ 7. 0 m,˜AQ1–kǚ“. ,. N±4JefghQ1D†Ð`abcd™. ,. 、 、 ®·òo#™Q1š›œ Q1ž›œ、Q1  M“ПQ1¡¢£¤óô–k,ÑÒÓKΈ ¾ 2 (a)‰Š, º-: (1)Q1š›œ•–:DQ1šŸy›œ/ó ôQ1šŠ›œ•–; (2)Q1ž›œ•–:écž›œÔŒ• –Çš†1-¯óôQ1ž›œ•–; (3)Q1 M“Е–:éc–ÕԌ•–Ç šDöÖRóôQ1ž Mij•–; (4)Q1m¡¢£¤¥•–:D–kǚž ijO_ 2ÌÌ͋ŒºS+# ÍÎ#ŸÏ­. al 4. (a)f/. (b)e1 ¾ 1 efghQ1×¾ Fig. 1 Photo of pileraft foundation. . . .     . . .  .

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(6) . .   .  .  . (b)ÀÁJ˜AQ1 Fig. 2 . ,. (c)ªJefghQ1 m) ¾ 2 Q1ǚ¾(ؓ: Section of pileraft foundation of station(unit:m). .  .      .

(7) ,:. !1 ". 33. #$% & '()*+,-./0123456(789:. ,. Ÿy¡¢£¤zóô¡¢£¤¥•–. [ 2 BCdefghijk[ Tab. 2 Design parameter comparison of test sections Ëa RS / m Â / m. S/ / m. RSLÙ. ˜AQ1 N. 6. 9. åRS. ªJef ghQ1 M. 7. 0. îe + f/ e «¶ 2. 3 m f /Ž 0. 5 m.. §[ef ghQ1 S. 7. 0. îe + f/ e «¶ 2. 4 m f /Ž 0. 5 m.. –kǚ. (). () (). ,. ¹ªJ^ ¸ŒÊg±Ç 50% ûäüAý¼¹˜ AQ1oö.. 0. , ,. —. 2. 8. 18. , ,. 4. 1. 18. 5. 1. 4 lm?@no N±ŒQ1™Úۊ›œŸ¬­›œóô±. ,. ¾ 3 Q1š›œ@p%J Fig. 3 Timehistory curves of settlement of foundation surface. –—ÜÝ ÄcÞ%Jóô±–zG. ßàábQ. ,. 1›œâ@«‰ã9cÞ%Jä‡åœæ E› LN. (1) ( ), T、 T fN±–@çeèé@ç; S、 S f L-: t @ ç Œ ù ™ › œ Ø;A 、B  f N ê ¶ Ÿ N t、 Փ. *L(1 )iëN t -t = A + B (t - t ). (2) S -S L(2 )µ¶,(t - t )/ (S - S )~ t - t 6}J _E›, 9écJ_Ú¼ìíHîïðז‡ðó t ñŸL (1 )ò°ó Äcז™ S 、 ôzG. Úc, ô t @ ç ™ › œ Ø S,ó × ± – Ú Û › œ Ø,ˆ L(3 )‰Š, (3) S = S +1/ B . S = S0 +. [ 3 >%elmtjk[ Tab. 3 Comparison of settlement of foundation surface. T - T0 A0 + B 0 T - T0. 0. 0. 0. 0. ǚ. -¯ `a / kPa. Ëa Ëa ÷G þt@ 12 Æ% Š›œ / mm / mm c / mm. N. 131. 1. 120. 6. 134. 0. 134. 8. 0. 54. M. 193. 2. 28. 8. 32. 4. 32. 8. 0. 004 7. 0. ±–ÚÛ ¬­›œ “/ %. 0. 0. 0. ˜AQ1ŸefghQ1™Q1šµM›œ. 0. ,. 0. 0. 0. 0. ∞. 0. 0. 0. 0. 2 BCpqMr 2. 1 >%eslmMr ¾ 3 NQ1šŠ›œ@p%J¾ µ 3 Nïð. ,. Þ%JH÷G™Q1šŠ›œe¬­›œ™Œ¦ õö. ˜AQ1ŸefghQ1™Q1š›œâ` a™Êg×Ê* ˜AQ1›œØ÷* º- N1. ,. ,. Ÿ N3 DËa 12 Æ%CK™›œfN 92. 9 Ÿ 134. 0 mm תJefghQ1 M1 Ÿ M3 DËa. ;. ,. 12 Æ%CK™›œfN 20. 8 Ÿ 32. 4 mm ºŠ ›œØ**»¼ ÇN˜AQ1™ 24% Ò¹`a. , ; ‡ñŸøùÃ*, §[^efghQ1›œñú*. µZ°¶ÿ™¬­ ¨!µM¬­›œàñfÖ 61. 0 mm »¼Ü 0. 8 mm ¬­›œ“ -¯›œ— öÖ › œ " ¬ — ¶ # ™ ¦ ñ  f N 0. 54% Ÿ. ,. ,. ). (. 0. 004 7% Œ¦¾¶efghQ16}à$™ù. , 、 `¥K™bc, *Q1`a&ÆNÅK`aóô zGäðS™. écL(4 )Œábåéű¤ñòoöóô ÷G, î—×'±¤ñòoöd™›œØóôŒ ¦, ÷G°±¤ñòŒ»¼oc›œ™bc. P P (4) s = ( β + )s , P P s Noc›œ; P N†Ð`a; P NŠ`a; L-: P NÏ ­ Ÿ ( ) ` a;s N Š › œ;β N * þ t ¦+. x÷G, ªJefghQ1DËa±¤bcd CK™›œØÇN 5 mm,¾¶Õa±¤Œ»¼e fghQ1oc›œ™bc}~. Ï­e()`a CK™›œØ¸Œ¹±¤`a„¼, &'Œ¹ef ¥K%¿I¥ èܱ»¼Q1›œ ÅÆQ1. l. g. z. z. g. z. g. g. l. z. z.

(8) ; < = > ? @ @ A. 34. ,. ®·,©ÁÂÊ*™1, éÅÕa±¤»¼oc. ,. ›œ-øÃË å.Q1—`a/Ód9åéű ¤ñò. 2. 2 >%MulmMr ¾ 4 NefghQ1ž›œ@p%J¾ º 0‹-™‡ðµŠ–8™Ÿ.Â. ¾ 5 N˜AQ. ,. ,. 1ŸefghQ1ž›œŒ¦%J t = 0 d µŠ †ÐS + þ t @ t = 480 d µ Š † Ð S + þ t. ,. 480 d @. µ 4 N˜AQ1ŸefghQ1ž› œ‡ðŒ¦.. ! 52 B. ,. +‘p-›œØ2 Êg S+þtcÊ34¹5 6 Q1š-¯RD`aþbc 12 Æ%CK™›œ. , N 35. 4 mm. efghQ1™›œÌ͉K¹dÎ eÈR›œN 31. 8 mm, Çϊ›œ™ 90% ; e ž, 3 ~ 4 mm , , ȝM7CK™›œ8¼ 9} ϊ 10% , , ›œ™ :â@«;}¶ÿiÆ gh›œ <¦e=>_¤šØú*. —efghQ1›œ¸¦, ˜AQ1›œØ÷ *, ©Ü 130 mm, :Ì͉K¹ 20 m Âøù`, ÇÏ܊›œØ™ 80% . §[^efghQ1 ž›œKª«—ªJ^¸?, ûä§[^4Lš ?4Lš†Ð¨ üAéc `a‡ñŸKÃ*, 23ïðQ1®·RS, Ö×ɧ[^Q1ž› œÃªJ^÷*. ¨©Q1ž›œª«¾¶îe ef®·¯/±gh™ijœØŸyðÁÂ. 2. 3 >%wx?@Mr ¾ 6 NefghQ1 M“НK%J¾. ,. ¾ 7 N˜AQ1ŸefghQ1 MijŒ¦¾.. .  . . . . . . . . . . . . . . ¾ 4 efghQ1ž›œ@p%J Fig. 4 Timehistory curves of layered settlement of pileraft foundation. . . . . . . . . . . . . . . . .      . ,.      . ¾ 5 å?å°Q1™ž›œŒ¦%J Fig. 5 Comparison curves of layered settlements of different foundations [ 4 >%vulmjk[ Tab. 4 Comparison of deep settlement of foundations Ç `a Ëaþt@›œØ š / kPa eȝM eȝd N 131. 1 88. 6 24. 0 M 193. 2. 4. 2. mm. Ëa 12 Æ%›œØ eȝd 29. 7. 3. 5. 32. 0. ªJefghQ1ž›œâ`a™iƪ«. ,.

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(12)   . ,. , “ÐN 3. 2 mm, Ì͉K¹S+‘p-, î:gh  M“ÐBÂiÆÃ¼. —ªJ^oö¸¦, 4Lš, §[^MÑ`a*¹ªJ^; ?4Lš, § [†ÐefghQ1¨ 4b7üAéc23 ™îegg¸¿ž™TUñò (C¾ 2 (a )),e¥ µMÇÈÃD, ɧ[^†1ö֖k™Q1 M “Ð÷*, e¥àñN 4. 6 mm. ˜AQ1 M“Ð Kª«—efghQ1¬­Ã*,×:‡ñ÷ *, ºÚ* M“ÐF“¹QµR, ‡ñN 9. 5 mm.  MijEMKâQžiÆFGª«¶ÿ, ŠÀ M¾ 20 m Âøù` M“ÐiÆÃ*. HYä Q1µš M“Ð,IäeȍÂR™ M“Ð,.

(13) . eȝM 99. 6. 25. 9. . ªJefghQ1 M“ЊÀMʼ Ú*  M“Ð@AQµ S+þt 440 d c Ú* M.   . . . ¾ 6 efghQ1 M“НK%J Fig. 6 Distribution curves of lateral deformation of pileraft foundation.   . .      . —Q1š™›œ%Jª«41 †Ð2ÀŸËaS.

(14) ,: efghQ1Ŧ˜AQ1¼, ¾¶ef®·9 !1 ". #$% & '()*+,-./0123456(789:. »¼Q1m™ MijeµMûüijCK™J g›œ.. ¾ 7 å?å°Q1™ M“ÐŒ¦%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±*ѝ †Ð`a, Q1mÓ²±Ã¼™`a¦+,2̪ JefghQ1¸AQ1ÂR™Õ¡¢£¤¥ <N˜AQ1™ 29. 4% . S+þt`aþbc,Q 1mÕ¡¢£¤¥OPQú,ûä,Ò¹§[`a øùÃ*, J†-¯£¤¥Qú†²Å¦ºR†^ ”, &'ºÕ¡¢£¤¥QúSÍԙ@«. ª JefghQ1™Õ¡¤D 18 m ÂRʔú/ ¹ 5 m ÂR,Ú*ñfN 3. 7 Ÿ 1. 8 kPa,S + þ t 440 d c Õ ¡ ¤  f » ¼ ½ 0. 7 Ÿ 0. 4 kPa, fdœ±Ç 70% Ÿ 60% . 3 ÆÇš™ Ö¨©Q1Õ¡¤%JŒ¦TU, Õ¡¤uʼ, àñ9} 13. 0 kPa,ÇÏJgù¥ ™ 30% . Ò¹Õ¡¤-虣¥V¼¹WX£ ¥VÂ, Q1måYCKZ[ÿ!Z\,û並 ×], ˜AQ1CK™Õ¡¤¦ghQ1™*. Ò¾ 8 9K âL†ÐS+™3 ×ò Q1. 3 p |. ,. 2̋ŒŽ^mQžefghQ1 ˆã. 、. 、 AQ1o ¢£¤¥]`_™”#–kob, öóô±.Œ¦§, g°d®Y: (1)efghQ1`a*¹˜AQ1,ûäË aþtcº÷G›œ<Nc!™ 24% `a,×: ¬­›œ“Ò 0. 54% »¼Ü 0. 004 7% ,¾¶ef 1,èܱ»¼Q1›œ、ÅÆQ1`¥K™ bc. (2)ef®·**»¼±gh™Q1›œ, efghQ1™›œÌ͉K¹dΞ, Çϊ› , 90% ,—˜AQ1›œÌ͉K¹Qµd œ™ 20 m øù`™ª«å?. (3)HYäQ1µš M“Ð,Iäeȍ R™ M“Ð, efghQ1ǚŦ˜AQ1Ç š¼, ¾¶ef¿À®·9»¼Q1m™ Mi jeµMûüijCK™Jg›œ. (4)efghQ1`aý*¹˜AQ1,ûä <N˜AQ1 ¸AÂR™Õ¡¢£¤¥b÷¼, ™ 29. 4% , ¾¶efgh³Sä†Ð`ac*Ñ Òef®·ÓÔ,Q1mӲʼ™`a,Ö× ±Q1Š›œij ž›œij  M“П¡. (a)efQ1. (b)˜AQ1 ¾ 8 Q1Õ¡¤@p%J Fig. 8 Timehistory curves of excess pore water pressure of foundation. »¼±Q1›œØ..

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