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Çѱ¹Áö¹Ý°øÇÐȸ / v.27, no.3, 2011³â, pp.85-94
º¯Çü·ü¿¡ µû¸¥ ¸ð·¡-°í¹« È¥ÇÕÀçÀÇ °Åµ¿ Ư¼º: ½ÇÇèÀû °üÂû
( Characteristics of Sand-Rubber Mixtures under Different Strain Levels: Experimental Observation )
ÀÌâȣ;º¯¿ëÈÆ;ÀÌÁ¾¼·; °í·Á´ëÇб³ °ÇÃà»çȸȯ°æ°øÇкÎ;°í·Á´ëÇб³ °ÇÃà»çȸȯ°æ°øÇкÎ;°í·Á´ëÇб³ °ÇÃà»çȸȯ°æ°øÇкÎ;
 
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´Ù¾çÇÑ ¸ð·¡ºÎÇǺñ($sf=V_{sand}/V_{total}$)¸¦ °¡Áö´Â ½Ã·á¸¦ Á¶¼ºÇÏ¿© º¯Çü·ü Å©±â¿¡ µû¸¥ ¸ð·¡-°í¹« È¥ÇÕÀç($D_{sand}/D_{rubber}=1$)ÀÇ °Åµ¿À» ºÐ¼®ÇÏ¿´´Ù. °øÁøÁÖ½ÃÇè, ¾Ð¹Ð½ÃÇè, ±×¸®°í Á÷Á¢Àü´Ü½ÃÇèÀ» ½Ç½ÃÇÏ¿´´Ù. º¯Çü·ü Å©±â¿¡ µû¶ó ¸ð·¡¿Í °í¹«´Â È¥ÇÕÀç Àüü °Åµ¿À» ¼­·Î ´Ù¸£°Ô Á¦¾îÇÑ´Ù. $sf{geq}0.4$ÀÇ È¥ÇÕÀç´Â ºñ¼±Çü Àü´Ü°­¼ºÀÇ °¨¼Ò°¡ °üÂûµÇ´Â ¹Ý¸é, $sf{leq}0.2$ÀÇ ³·Àº ¸ð·¡ºÎÇǺñ¸¦ °¡Áö´Â È¥ÇÕÀç´Â »ó´çÈ÷ ³ôÀº ź¼ºÇѰ躯Çü·üÀ» º¸ÀδÙ. °í¹« ÀÔÀÚ°¡ force chainÀÇ ¿ªÇÒÀ» ¼öÇàÇÒ ¶§ ¼öÁ÷º¯ÇüÀº ±Þ°ÝÇÑ Áõ°¡¸¦ º¸ÀδÙ. È¥ÇÕÀç ³»ÀÇ °í¹«ºÎÇǺñ°¡ °¨¼ÒÇÔ¿¡ µû¶ó È¥ÇÕÀçÀÇ °­µµ´Â Áõ°¡ÇÏ´Â °æÇâÀ» º¸À̸ç $sf{leq}0.8$ÀÇ È¥ÇÕÀç´Â Àü´Üº¯Çü¿¡ µû¶ó ºÎÇÇ ¼öÃà °Åµ¿À» º¸ÀδÙ. °í¹« ÀÔÀÚ´Â º¯Çü·ü Å©±â¿¡ µû¶ó È¥ÇÕÀç ³»¿¡¼­ ¼­·Î ´Ù¸¥ ¿ªÇÒÀ» ¼öÇàÇÑ´Ù: ¹Ì¼Òº¯Çü·ü ¿µ¿ª¿¡¼­´Â È¥ÇÕÀç ³»ÀÇ Á¢Ã˼ö Áõ°¡ ¹× ¼Ò¼ºÀÇ Á¦¾î; Áß°£º¯Çü·ü ¿µ¿ª¿¡¼­´Â force chainÀÇ Á±¼ ¹æÁö; ±×¸®°í ´ëº¯Çü·ü ¿µ¿ª¿¡¼­´Â È¥ÇÕÀçÀÇ ºÎÇǼöÃà °Åµ¿À» À̲ö´Ù.
Mixtures of sand and rubber particles ($D_{sand}/D_{rubber}=1$) are investigated to explore their characteristics under different stain level. Mixtures are prepared with different volumetric sand fractions ($sf=V_{sand}/V_{total}$). Experimental data are gathered from a resonant column, an instrumented oedometer, and a direct shear tests. Results show that sand and rubber differently control the behavior of the whole mixture with strain level. Non-linear degradation of small strain stiffness is observed for the mixtures with $sf{geq}0.4$, while the mixtures with low sand fraction ($sf{leq}0.2$) show significantly high elastic threshold strain. Vertical stress-deformation increases dramatically when the rubber particle works as a member of force chain. The strength of the mixtures increases as the content of rubber particle decreases, and contractive behavior is observed in the mixtures with $sf{leq}0.8$. Rubber particle plays different roles with strain level in the mixture: it increases a coordination number and controls a plasticity of the mixture in small strain; it prevents a buckling of force chain in intermediate strain; it leads a contractive behavior in large strain.
 
Ű¿öµå
Compressibility;Sand-rubber mixture;Shear modulus;Strain level;Strength;Transition;
 
Çѱ¹Áö¹Ý°øÇÐȸ³í¹®Áý / v.27, no.3, 2011³â, pp.85-94
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-2427
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO201117148819501)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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