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Çѱ¹Áö¹Ý°øÇÐȸ / v.22, no.11, 2006³â, pp.151-158
ÀÀ·Â¿¡ ÀÇÇÑ ¹ÐµµÁõ°¡ÀÇ ¿µÇâ°ú ¾×»óÈ­ ¿ø½É¸ðÇü½ÇÇèÀ» À§ÇÑ ¸ðÇüÁö¹Ý¼ºÇü¹ý
( The Influence of Stress-induced Densification and Centrifuge Model Preparation Method for Soil Liquefaction )
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±ÕÀÏÇÑ ¸ð·¡Áö¹ÝÀ» ÀÌ¿ëÇÑ ¿ø½É¸ðÇü½ÇÇè¿¡¼­´Â ÁöÇ¥¸é±Ùó¿¡¼­ ¾×»óÈ­°¡ ¹ß»ýÇÑ ÈÄ¿¡ Á¡Â÷ÀûÀ¸·Î ±íÀº °÷À¸·Î ÀüÆÄµÇ´Â °æÇâÀ» º¸¿´´Ù. ÀÌ¿Í °°Àº Çö»óÀº ½Ç³»½ÇÇè¿¡¼­ »óÀçÇÏÁßÈ¿°ú¸¦ °í·ÁÇßÀ» ¶§ °üÂûµÇ´Â ¾×»óÈ­Çö»ó°ú »ó¹ÝµÇ´Â °Íó·³ º¸ÀδÙ. ±×·¯³ª, ÀÀ·ÂÁõ°¡¿¡ µû¸¥ ¸ðÇüÁö¹ÝÀÇ »ó´ë¹ÐµµÁõ°¡°¡ ±¸¼Ó¾ÐÁõ°¡¿¡ µû¸¥ ¾×»óÈ­ÀúÇ×°¨¼Ò¸¦ »ó¼â½ÃŲ´Ù. ÀÌ¿Í °°Àº ÀÀ·ÂÁõ°¡¿¡ µû¸¥ »ó´ë¹ÐµµÁõ°¡´Â ½ÇÁ¦ ¿ø½É¸ðÇü½ÇÇè¿¡¼­ ¹ß»ýÇϰí ÀÖÀ¸³ª, ¸ðÇüÁö¹Ý¼ºÇü¹ý¿¡¼­´Â °í·ÁµÇ°í ÀÖÁö ¾Ê´Ù. µû¶ó¼­, º» ³í¹®¿¡¼­´Â ¿ø½É¸ðÇü½ÇÇè¿¡¼­ ¹ß»ýÇÒ ¼ö ÀÖ´Â »ó´ë¹ÐµµÁõ°¡¸¦ °í·ÁÇÑ »õ·Î¿î ¿ø½É¸ðÇüÁö¹Ý¼ºÇü¹ýÀ» Á¦¾ÈÇÏ¿´´Ù. »õ·Î¿î ¸ðÇüÁö¹Ý¼ºÇü¹ýÀº ¾×»óÈ­¿¡ °üÇÑ $K_0$ È¿°ú¸¦ ¿¬±¸Çϴµ¥ »ç¿ëµÉ ¼ö ÀÖÀ¸¸ç, º» ¿¬±¸¿¡¼­´Â ¼öÄ¡ÇØ¼®¹æ¹ýÀ» ÀÌ¿ëÇÏ¿© ±× ½Ç¿ë¼ºÀ» Áõ¸íÇÏ¿´´Ù.
Centrifuge tests have shown that a uniformly placed sand layer will first initiate liquefaction near the surface and that liquefaction will progress downward during shaking. This appears to be in conflict with the overburden stress effect on soil liquefaction (i.e., $K_0$ effect) observed in laboratory testing. This discrepancy can be explained by stress-induced densification at depth which overcomes the effect of confining stress on liquefaction resistance. Stress densification occurs in centrifuge model tests but its effect has generally not been considered when preparing or evaluating centrifuge models. A new centrifuge model preparation method is proposed by considering stress-induced densification upon spin-up. The proposed method can be used to explore $K_0$ effects. The method is supported in this study by numerical predictions.
 
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Centrifuge test;Densification;Liquefaction;Overburden stress effect;Preparation method;
 
Çѱ¹Áö¹Ý°øÇÐȸ³í¹®Áý / v.22, no.11, 2006³â, pp.151-158
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-2427
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200604623520433)
¾ð¾î : ¿µ¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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