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Çѱ¹Áö¹Ý°øÇÐȸ / v.20, no.4, 2004³â, pp.15-27
´ëÇü ´º¸ÅƽÄÉÀ̽¼ÀÇ Áָ鸶Âû·Â »êÁ¤
( Evaluation of Skin Friction to Large Size Pneumatic Caissons )
È«¿øÇ¥;¿©±Ô±Ç;±èÅÂÇü; Áß¾Ó´ëÇб³ °ø°ú´ëÇÐ °Ç¼³È¯°æ°øÇаú;Áß¾Ó´ëÇб³ °ø°ú´ëÇÐ °Ç¼³È¯°æ°øÇаú;Çѱ¹Çؾç´ëÇб³ °ø°ú´ëÇÐ Åä¸ñȯ°æ½Ã½ºÅÛ°øÇкÎ;
 
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º» ¿¬±¸¿¡¼­´Â ÇöÀç±îÁö ¿¬±¸µÈ ±íÀº ±âÃÊÀÇ Áָ鸶Âû·Â »êÁ¤¹ý¿¡ ÀÇÇØ Á¦¾ÈµÈ ¹æ¹ýµéÀ» °ËÅäÇÏ¿© ´ëÇü±âÃÊÀÎ ÄÉÀ̽¼(¿ì¹°Åë)±âÃÊ¿¡ ´ëÇÏ¿© Áָ鸶Âû·ÂÀ» ÀûÀýÈ÷ »êÁ¤ÇÒ ¼ö ÀÖ´Â »êÁ¤¹ýÀ» Á¦½ÃÇÏ¿´´Ù. ƯÈ÷ È«¿øÇ¥(1987)°¡ Á¦¾È¾È Áָ鸶Âû·Â »êÁ¤¹ýÀ» ±âº» Åä´ë·Î ÇÏ¿© »õ·Î¿î Áָ鸶Âû·Â »êÁ¤¹æ¹ý(Kn°è¼ö¹ý)À» Á¦½ÃÇÏ¿´´Ù. ±×¸®°í ±íÀº±âÃÊÀÎ ¸»¶ÒÀÇ Áָ鸶Âû·ÂÀ» ÇÕ¸®ÀûÀ¸·Î »êÁ¤ÇÒ ¼ö ÀÖ´Ù°í ¾Ë·ÁÁø $lambda$¹ýÀ» ÀÌ¿ëÇÑ ÄÉÀ̽¼ÀÇ Áָ鸶Âû·Â »êÁ¤¿¡ ´ëÇØ¼­µµ °ËÅäÇÏ¿´´Ù. À̸¦ À§ÇØ ¿µÁ¾´ë±³ ÁÖžÇϺα¸Á¶ÀÎ ´º¸ÅƽÄÉÀ̽¼ ±âÃÊÀÇ ½Ã°ø½Ã °èÃøµÈ Áָ鸶Âû·Â µ¥ÀÌÅ͸¦ ÀÌ¿ëÇÏ¿´´Ù. Áָ鸶Âû·ÂÀº ħ¼³¼Óµµ¿¡ ºñ·ÊÇϸç Áָ鸶Âû·ÂÀÇ ºÐÆ÷¾ç»óÀº Á÷¼±ºÐÆ÷º¸´Ù Æ÷¹°¼±ºÐÆ÷¿¡ °¡±õ´Ù. ÀúºÎ°¡ È®´ëµÇ´Â ´ë±Ô¸ð ÄÉÀ̽¼±âÃÊ Ä§¼³½Ã ¹ß»ýÇÏ´Â Áָ鸶Âû·Â »êÁ¤°á°ú ÀϹÝÀûÀÎ ¸»¶Ò±âÃÊÀÇ Áָ鸶Âû·Â°ú´Â »óÀÌÇÏ´Ù. Á¦¾ÈµÈ Kn°è¼ö¹ý°ú $lambda$¹ýÀ» °¢°¢ »ç¿ëÇÏ¿© »êÁ¤ÇÑ ÄÉÀ̽¼ÀÇ Áָ鸶Âû·ÂÀ» ½ÇÁ¦ ÄÉÀ̽¼ÀÇ °èÃø°ªÀ¸·ÎºÎÅÍ »êÁ¤ÇÑ Áָ鸶Âû·Â°ú ºñ±³ÇÑ °á°ú, Kn°è¼ö¹ý¸¦ ÀÌ¿ëÇÏ¿© »êÁ¤ÇÑ ÄÉÀ̽¼ÀÇ Áָ鸶Âû·ÂÀº $lambda$¹ý¿¡ ÀÇÇØ »êÁ¤µÈ Áָ鸶Âû·Âº¸´Ù ½ÇÃø°ª¿¡ ÈξÀ ±ÙÁ¢ÇÏ´Ù. Áï, ÀúºÎ°¡ È®´ëµÈ Çü»óÀÇ ´ëÇüÀÇ ÄÉÀ̽¼±âÃÊÀÇ Áָ鸶Âû·ÂÀ» »êÁ¤Çϱ⿡´Â È«¿øÇ¥°¡ Á¦¾ÈÇÑ ½ÄÀ» ÀÌ¿ëÇÑ Kn°è¼ö¹ýÀÌ $lambda$¹ýº¸´Ù ´õ ÀûÀýÇÑ ¹æ¹ýÀÓÀ» ¾Ë ¼ö ÀÖ´Ù.
In this study, skin friction evaluation methods developed f3r deep foundation system were investigated and a method that can properly evaluate the skin friction of large size pneumatic caisson was proposed. Especially, based on Hong Won-Pyo's method, new technique (Kn parameter method) was suggested for estimation of the skin friction. The $lambda$ method used widely to pile foundation was also investigated fur the applicability of estimation of the skin friction of large size pneumatic caisson. To do this, the data measured from the pneumatic caissons installed as a substructure of main tower in the suspension bridge part of Youngjong Grand Bridge were utilized. The data show that the skin friction is proportional to the rate of sinking, and the skin friction distribution with depth is similar to parabolic type rather straight line, which is a type generally observed in pile foundation. The skin frictions predicted by the Kn and $lambda$ methods were plotted with the measured data for comparisons. It is cleary shown that the skin frictions estimated by the proposed Kn parameter method are well matched with the measured data. That is, for the large size pneumatic caisson having wide base, the new technique developed from Hong Won-Pyo's method is more suitable for estimation of the skin friction rather than the $lambda$ method.
 
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Çѱ¹Áö¹Ý°øÇÐȸ³í¹®Áý / v.20, no.4, 2004³â, pp.15-27
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-2427
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200411922382944)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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