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Çѱ¹Áö¹Ý°øÇÐȸ / v.24, no.8, 2008³â, pp.125-135
ÀÔÀÚÅ©±âºñ¿¡ µû¸¥ °­-¿¬¼º È¥ÇÕÀçÀÇ °øÇÐÀû Ư¼º
( Characteristics of Rigid-Soft Particle Mixtures with Size Ratio )
ÀÌâȣ;À±Çü±¸;±è·¡Çö;ÀÌ¿ìÁø;ÀÌÁ¾¼·; Á¶Áö¾Æ°ø´ë Åä¸ñ°øÇаú;°í·Á´ëÇб³ °ÇÃà.»çȸȯ°æ°øÇаú;°í·Á´ëÇб³ °ÇÃà.»çȸȯ°æ°øÇаú;°í·Á´ëÇб³ °ÇÃà.»çȸȯ°æ°øÇаú;°í·Á´ëÇб³ °ÇÃà.»çȸȯ°æ°øÇаú;
 
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¸ð·¡ ÀÔÀÚ¿Í ¿¬¾àÇÑ °í¹« ÀÔÀÚ·Î ÀÌ·ç¾îÁø °­-¿¬¼º È¥ÇÕÀçÀÇ ÀÀ·Â-º¯Çü ¹× Àü´ÜÆÄ Ư¼ºÀ» Æò°¡Çϱâ À§ÇØ °í¹«¿Í ¸ð·¡ÀÇ ºÎÇǺñ(sf)¿Í ÀÔÀÚ Å©±âºñ(sr)¸¦ ´Þ¸®ÇÏ´Â ½Ã·á¸¦ Á¶¼ºÇÏ¿´´Ù. º¥´õ ¿¤¸®¸ÕÆ®°¡ ¼³Ä¡µÈ ¾Ð¹Ð¼¿À» ÀÌ¿ëÇÏ¿© ÀÀ·Â-º¯Çü½ÃÇè ¹× $K_o$ »óÅ¿¡¼­ÀÇ ¹Ì¼Òº¯Çü Àü´ÜÆÄ ½ÃÇèÀ» ½Ç½ÃÇÏ¿´´Ù. ÀÏÁ¤ÇÑ ÀÔÀÚ Å©±âºñ¸¦ °¡Áö´Â °­-¿¬¼º È¥ÇÕÀç´Â °­¼ºÀÇ ÀÔÀÚ¿¡¼­ ¿¬¼ºÀÇ ÀÔÀÚ·Î °Åµ¿ÀÌ ÀüÀ̵Ǵ ÀÀ·Â-º¯Çü ¹× ¹Ì¼Òº¯Çü Àü´ÜÆÄ Ư¼ºÀ» º¸¿´´Ù. ¶ÇÇÑ, $G_{max}=;{Lambda}({sigma}'_{o}/kPa)^{zeta}$ °ü°è¿¡¼­ ¸ð·¡ÀÇ ºÎÇǺñ(sf)°¡ $0.4{sim}0.6$ÀÎ ±¸°£¿¡¼­ $Lambda$°è¼ö°¡ ±Þ°ÝÈ÷ Áõ°¡Çϸç $zeta$ Áö¼ö´Â ÃÖ´ë°ªÀ» º¸ÀÌ´Â °ÍÀ¸·Î °üÂûµÇ¾ú´Ù. ÀüÀÌ È¥ÇÕÀç´Â ±¸¼ÓÀÀ·ÂÀÇ º¯È­¿¡ ¸Å¿ì ¹Î°¨ÇÑ °Åµ¿À» º¸ÀÌ¸ç ¿¬¼ºÀÎ °í¹«ÀÔÀÚ´Â ÀçÇÏ ÇÏÁß¿¡ ÀÇÇØ ½±°Ô º¯ÇüµÇ¹Ç·Î ÃÖ¼Ò °£±ØÀ²À» °¡Áö´Â °­-¿¬¼º È¥ÇÕÀçÀÇ ºÎÇǺñ´Â ÀçÇÏµÈ ÀÀ·ÂÀÇ Å©±â¿¡ Á¿ìµÈ´Ù. ½Ç³»½ÃÇèÀ» ÀÌ¿ëÇÑ º» ¿¬±¸¿¡¼­´Â ÀÔÀÚ Å©±â ºñ¿Í ¸ð·¡ ºÎÇǺñ°¡ °­¼º ÀÔÀÚ¿Í ¿¬¼º ÀÔÀÚÀÇ È¥ÇÕÀç·á °Åµ¿À» °áÁ¤ÇÏ´Â °ÍÀ¸·Î ¿äÀÎÀ¸·Î ºÐ¼®µÇ¾ú´Ù.
Rigid-soft particle mixtures, which consist of sand and rubber, are investigated for the understanding of the stress-deformation and elastic moduli. Specimens are prepared with various size ratio sr between sand and rubber particles, and different volumetric sand fraction sf. Small strain shear waves are measured under $K_o$-loading condition incorporated with the stress-deformation test by using oedometer cell with bender elements. The stress-deformation and small strain shear wave characteristics of rigid-soft particle mixtures show the transition from a rigid particle behavior regime to a soft particle behavior regime under fixed size ratio. A sudden rise of $Lambda$ factor and the maximum value of the $zeta$ exponent in $G_{max}=;{Lambda}({sigma}'_{o}/kPa)^{zeta}$ are observed at $sf;{approx};0.4{sim}0.6$ regardless of the size ratio sf. Transition mixture shows high sensitivity to confining stress. The volume fraction for the minimum porosity may depend on the applied stress level in the rigid-soft particle mixtures because the soft rubber particles easily distort under load. In this experimental study, the size ratio and volumetric sand fraction are the important factors which determine the behavior of rigid and soft particle mixtures.
 
Ű¿öµå
Rigid-soft particles;Shear wave velocity;Size ratio;Stiffness; Stress-strain;Volume fraction;
 
Çѱ¹Áö¹Ý°øÇÐȸ³í¹®Áý / v.24, no.8, 2008³â, pp.125-135
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-2427
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200800557078825)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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