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Analysis of Water Pressure in Ballastless Track Crack

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(1)& ' ( ) * + + , ! 51 " ! 1 # 2016 $ 2 % JOURNAL OF SOUTHWEST JIAOTONG UNIVERSITY. :. ( ). . Vol. 51 No. 1 Feb. 2016. :. 0345 02582724 2016 01003607 DOI 10. 3969 / j. issn. 02582724. 2016. 01. 006. 6789:;<=>?@ABCDEF. ,. ,. ,. ,. !"# $%& '() *+, -./. (&'()*+cdefgfhiQjk89lmn,op qr 610031). :. ,. G H st]uvwx]yz{|} ]~VWFGXYZ[€{‚ƒ„ †. E@Acd‡ˆ‰Š‹. ,. , , , 、 、 、 ²³•U~K]^L{‚. abH´µ¶: ·¸Z[†³{CD, ]^L¹º»¼,½¾*¯¿BsZ[À ÁÂ; K]^LJª«¬­ÃĹůCÇÈ, Jª«®¯¹g`ÇÈ, JZ[²³•¹ÉÆÊƒÇÈ. s®¯ ¬­E 5 Hz ª«‰Š‹, ]^LaŒ{ËmÌËH´J™Íab2ÎÉÏ, ÐÑCŸÒÓ{]^LÔ E 10 kN、 、 0. 177 0. 161 kPa. ¯aÕE IJK:VWFG; Z[; ‡ˆ; ª«; ]^L LMEN5:U213. 244 0OPQR:A. VWFGZ[\]^L{aŒŽ^L*{‚‘’ 2“”•–—wK•˜™ šŠ›œžŸ  †¡ Z[\K]^LaŒ¢b£. ¤Š¥¦§ab¨© ANSYS w CFX ab¡ª«¬­ ª«®¯ Z[°± Z[. Analysis of Water Pressure in Ballastless Track Crack. ,. ,. ,. ,. CAO Shihao YANG Rongshan LIU Xueyi SU Chengguang GUO Likang. (MOE Key Laboratory of HighSpeed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China). :. ,. Abstract In the areas with sufficient rainfall and poor drainage water in ballastless track has significant effect on the crack propagation. To analyze the distribution of water pressure and influential factors on water pressure in the ballastless track under highfrequency train load based on the law of mass conservation and momentum theorem the analytical expression of water pressure was deduced by using the control volume method. The finite element software ANSYS and CFX were used to analyze the influence of loading frequency load amplitude crack length and crack opening on water pressure. The theoretical results show that the maximum water pressure appears at the crack tip under loading and decreases along the crack. The value of water pressure is proportional to load amplitude square of loading frequency and inversely proportional to crack opening. At the frequency of 5 Hz and loading amplitude of 10 kN the hydrodynamic pressure distributions resulted from experiment and theoretical computation are nearly identical and the corresponding hydrodynamic pressure peaks are 0. 177 and 0. 161 kPa respectively. Key words ballastless track cracks train load water pressure. ,. ,. ,. ,. ,. ,. ,. , :. , ; ; ; ;. VWFGÖרiÙÚÛÜ\ÝXY†ÞZ. ,. [„Eßà áâZ[sãt•„ä|}€å~. ñ“]^LòBw‰Šó™{ôõ` 7ö\÷sVWFGøù~åÇúûü¥ýþ{@A.. æç èst]uvÝx]yz|é€d­êë [14]. íî ]sVWFGZ[€ØiÙï¸ Óì. ÿ!")ØËm~ª«®¯~]^L{‚#$ [3] %&~']‰Š‹ CA ()L+`*+ ¡ab. ðE8ê{‰Š.. ,#$¡@A. ,. !"#$ %&'( )*+, -.)* /012. ,. ,. ;. [4]. -Ä{@A./ٓÚÛÜ8. :20150602 :-./01+234567(51278431 );-./01+238967(U1434208 ) ::;<(1988 — ),=,>?@AB,@ACDEFGHIJFGKL+,Email:531148108@ qq. com :MNO(1975 — ),=,PQR,>?,@ACDEFGHIJFGKL+,Email:yrs@ home. swjtu. edu. cn ::;<,MNO,S+T,U. VWFGXYZ[\K]^L_`ab[J]. &'()*++,,2016 ,51 (1 ):3642..

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(33). (b)]^LaŒ(™¯›þ). (c)]^LÔ¯. c 12 Z[²³•~]^L{‚ Fig. 12 Effect of the crack opening on water pressure. () ( ) , ½¾*¯¿BsZ[ ]^L·¸Z[¹º»¼, ( ) , . 12 c ÀÁ ñc íÐ ¢b–—J™¯›þ2 , ÎÉÏ ½]^LM¸Z[²³•{aR躐; ñc 12 a wc 12 b íÐ VWFGZ[\. #K]^LJZ[²³•¹ÉÆÊƒÇÈ.. 5. 2. 4 Z[°±{‚ ²³•E 3 mm y9°± 0. 2 0. 4 0. 6 0. 8. ( 、 、 、 、 , ,. aŒ]^LÔ¯MZ[°±{+,îc 13..  .  . . . .  .  . .  . .  . .  .  . . .  .  . . . . .  . . .  . . . . . . . . . . . . (a)]^LaŒ(¢b–—).  .  . . . . . . . . . . . . ,. 、 ) 、. 1. 0 1. 2 m { V W F G X Y Z [ s ® ¯ E 75 kN ¬­E 30 Hz {ª«‰Š‹ Z[\]^L. . . . . . . . . . . . . . . (b)]^LaŒ(™¯›þ). (c)]^LÔ¯. c 13 Z[°±~]^L{‚ Fig. 13 Effect of the crack length on water pressure. (). () , [\]^L·¸Z[¹º»¼, ½¾*¯¿Bs Z[ÀÁÂ. ñc 13 (c )íÐ,¢b–—J™¯› þ2ÎÉÏ,½]^LM¸Z[°±{aRèa R; ÕZ[°±“ 0. 4 m S,òB{]^Lƒ„ , YS]^L~HI{]L5Z‰Š2Î툉 y–; ÕZ[°±*“ 0. 4 m m,]^LM¸Z[ °±{aRè$daR, òB{]^Lxy‰Š“ Z[µT, ÕÀÁ{¤L©±‘%&†'({)Z *`S, ¿B]L5Z, WHI°Y+,. -4=>@A,~“‡ˆª«‰Š‹,sZ[ ñc 13 a wc 13 b íÐ VWFGXYZ. ,. i./0y+S ‡ˆ$ˆd±w¡8?‚VW. , ˆ$ˆd±J¡8{a*èaR, #J$ˆd±2 Î¹ÅÆCÇÈ, J¡8¹g`ÇÈ.. FGZ[\]^L{Ðü8ꑒ ]^LM¸‡. 6 t v. ,. 1~c¬‡ˆª«‰Š‹ VWFGXYZ[. , 、 、 ›þ, ӆA‹HÍ: (1)f{§`,2“”•–—wK•˜ šŠ›œžŸ †‡ˆª«‰Š‹VWFG ™, \]^LaŒúû )ؙÍab Ëm@A ™¯.

(34) 42. 8 9 : ; < = = >. ;. XYZ[\]^LaŒ¢b£ )ØËmm2µ ¶ ™Í–—JËmÌËH´2ÎÉÏ.. ! 51 ?. [5] ÿ;1,3DE. ']^L‹ÚÛÜF K )Z˜™ 2007 , 38 (7 ):792798. Ëm̘[J]. ]G+,, Jianmin. Experimental XU Shilang, WANG. , (2)‡ˆª«‰Š‹,VWFGXYZ[\K determination of doubleK fracture parameters of ]^L?ñf§`、Z;²³•、ª«¬­wª concrete under water pressure[J]. Journal of Hydraulic «® ¯ U ‘ ’ - 4 Þ ˜ {;Õ Z [ ² ³ • * “ Engineering,2007 ,38 (7 ):792798. 2 mm S, f§`{‚2Î툉y–, YS] [6] BRHWILER E, SAOUMA V. Water Fracture ^L*Jª«¬­¹ÅÆCÇÈ, Jª«®¯¹ interaction in concrete,part Ⅰ:racture properties[J]. JZ[²³•¹ÉÆÊƒÇÈ;™¯› g`ÇÈ, ACI Materials Journal,1995 ,92 (3 ):296303. þJ™Íab2ÎÉÏ. [7] BRHWILER E, SAOUMA V. Water Fracture interaction in concrete,part Ⅱ:hydrostatic pressure in (3)Z[\]^L·¸Z[†³CD¹º cracks[J]. ACI Materials Journal,1995 ,92 (3 ):383 »¼, ¾*¯¿BsZ[ÀÁÂ. 390. _w0O: [8] SLOWIK V, SAOUMA V. Water pressure in. [] Engineering,2000 ,126 (2 ):235242. [9] SHINMURA A,SAOUMA V. Fluid fracture interaction 929934. in pressurized reinforced concrete vessels[J]. Materials WANG Ping,XU Hao,CHEN Rong,et al. Effects and Structures,1997 ,30 (2 ):7280. analysis of cracking of CRTS Ⅱ slab track on 10 ] TINAWI R,GUIZANI L. Formulation of hydrodynamic [ subgrade[J]. Journal of Southwest Jiaotong University, pressure in cracks due to earthquakes in concrete 2012 ,47 (6 ):929934. dams[J]. Earthquake Engineering and Structural [2] 788,9:;,ÿ<=,U. u>q{w~q£VW Dynamics,1994 ,23 (7 ):699715. FG$ˆKL_`{‚ [J ]. &'()*++,, 11 ] JAVANMARD F, LEGER P, TINAWI R. Seismic [ 2014 , 49 (6 ):951966. structural stability of concrete gravity dams considering REN Juanjuan, YAN Xiaobo, XU Guanghui, et al. transient uplift pressures in cracks[J]. Engineering Effect of contact loss underneath concrete roaded on Structures,2005 ,27 :616628. dynamic performances of slab Tracksubgrade [12] Ù&HIÝw-eGk. eD·[2005]754 JKL system[J]. Journal of Southwest Jiaotong University, gVWFG·–M'[S]. NO:Ù-eG†PQ, 2014 ,49 (6 ):951966. 2005. [3] ÿ!",MNO,S+T. ª«®¯~VWFGHI [ 13 ] 5oR. hifL+ [M ]. ST:&Ù1B*+ 2015 (1 ):32 Z[]^L‚ [J ]. eGhi+,, 2008 :104105. †PQ, 37. [14] U.V. ~`L+ [M]. NO,cUQj†PQ, XU Guihong,YANG Rongshan,LIU Xueyi. Impact of 2001 :109114. load amplitude on the water pressure of nonballasted [15] WXG,7YD,3Z[. \]JÚÛÜ]L5Z; track structure[J]. Journal of Railway Engineering 2005 , 36 (6 ): \]^LaŒ{–—[J ]. ]G+,, Society,2015 (1 ):3237. 656661. [4] %&,?&@,A:=,U. ']‰Š‹q£VWFG LI Zongli,REN Qingwen,WANG Yahong. Formula CA ()L + ` * + , [J ]. c d e f B C,2014 , for water pressure distribution in rock or concrete 5 (4 ):1014. fractures formed by hydraulic fracturing[J]. Journal of YAN Hua,HU Huafeng,ZENG Xiaohui,et al. Studies Hydraulic Engineering,2005 ,36 (6 ):656661. on mechanical changes of CA mortar for slab track under hydrostatic effect[J]. High Speed Railway Technology, (@ABC:D E FABC:G H) 2014 ,5 (4 ):1014. [1] 3‹,ÿ4,56,U. f2= CRTSⅡ|q£FGZ 2012 , 47 (6 ): [‚ab [J ]. &'()*++,,. propagation concrete cracks J . Journal of Structural.

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