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Çѱ¹Áö¹Ý°øÇÐȸ / v.3, no.1, 1987³â, pp.39-52
ºÎÁÖº¯ ¸¶Âû·Â°ú ±× °¨¼Ò¹æ¹ýÀÇ Æò°¡
( Estimation and Reduction of Downdrag Force )
ÀÓÁ¾¼®;±è¸í¸ð;Á¤ÀÎÁØ; ¼­¿ï´ëÇб³ °ø°¡´ëÇÐ;¼­¿ï´ëÇб³ °ø°ú´ëÇÐ ¼­¿ï´ëÇб³ °ø°ú´ëÇÐ;;
 
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¸»¶Ò¿¡ ÀÛ¿ëÇÏ´Â ºÎÁÖº¯¸¶Âû·ÂÀÇ ¾ç»ó°ú °¨¼Ò¹æ¹ýÀ» ÀÏ·ÃÀÇ ¸ðÇü½ÇÇèÀ» ÅëÇÏ¿© Æò°¡ÇÏ¿´´Ù. °¨¼Ò ¹æ¹ýÀ¸·Î´Â ¿ªÃ»Àç¿Í È®´ë¼±´ÜºÎ¸¦ »ç¿ëÇÏ¿´´Ù. ½ÇÇèÀº Á¡¼ºÅä·Î ÀÌ·ç¾îÁø ¸ðÇüÁö¹Ý¿¡¼­ Áö¸§ÀÌ 3.2cmÀÎ ¸ðÇü°­°ü¸»¶ÒÀ» »ç¿ëÇÏ¿© ¼öÇàÇÏ¿´À¸¸ç ºÎÁÖº¯¸¶Âû·ÂÀ¸·Î ÀÎÇÑ ÇÏÇâ·ÂÀ» ¾Ð·Â°è·Î ÃøÁ¤ÇÏ¿´´Ù. ƯÈ÷ ¿©·¯°¡Áö °æ¿ì¿¡ ´ëÇÑ È®´ë¼±´ÜºÎÀÇ °¨¼ÒÈ¿°ú´Â Àι߽ÇÇèÀ» ÅëÇÏ¿© ¾Ë¾Æº¸¾Ò´Ù. º¸Å븻¶ÒÀÎ °æ¿ì¿¡ ºÎÁÖº¯¸¶Âû·ÂÀº ±íÀÌ¿¡ µû¶ó 0.25(À¯È¿»óÀç¾Ð)·Î ³ªÅ¸³ª¸ç ¸»¶Ò°ú ÁÖº¯ Èë°úÀÇ »ó´ëº¯À§°¡ ¾ÆÁÖ À۾Ƶµ ºÎÁÖº¯¸¶Âû·ÂÀº ÃæºÐÈ÷ ¹ßÈֵȴÙ. ¸»¶Ò¿¡ ¿ªÃ»À縦 µµÆ÷ÇÏ¿© ºÎÁÖº¯¸¶Âû·ÂÀ» 50%ÀÌ»ó °¨¼Ò½Ãų ¼ö ÀÖ´Ù. È®´ë¼±´ÜºÎÀÇ »ç¿ëµµ ¤²ÁÖ º¯¸¶Âû·ÂÀÇ °¨¼Ò¿¡ È¿°úÀûÀ̾úÀ¸¸ç, ¸»¶ÒÀÇ Áö¸§¿¡ ´ëÇÑ Âø·¯¼³´ÜºÎÀÇ Áö¸§ÀÎ Ä¿Áö°Å³ª ÁÖº¯ÀÇ °­µµ°¡ Ä¿Áú¼ö·Ï ±× È¿°ú´Â Ä¿Áø´Ù. ¿ªÃ»Àç¿Í È®´ë¼±´ÜºÎ¸¦ Á¾½Ã¿¡ »ç¿ëÇÏ´ø ¾à 90%ÀÇ °¨¼ÒÈ¿°ú°¡ ÀÖ´Ù.
Model pile tests are performed, first, to estimate donwndrag exerted on pile surfaces due to the settlement of surrounding soils, and, second, to evaluate the efficiency of the downdrag reduction methods such as the bitumen coating method and the method of the attachment of an enlarged base. Test results show that the downdrag forces may be expressed as 0.25(;effective overburden). Bitumen coating reduces the downdrag by more than 50 percent, and the enlarged base attachment method is also effective, whose effectiveness increases as the sixte of the base increases as expected. When the bitumen coating and enlarged base are both applied, the downdrag force is reduced as much as 90 percent. Finally, it is found that the quantity of the relative displacement between the pile and the surrounding soil downdrag is extremely small.
 
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Çѱ¹Áö¹Ý°øÇÐȸÁö:Áö¹Ý / v.3, no.1, 1987³â, pp.39-52
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-215X
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO198711920442854)
¾ð¾î : Çѱ¹¾î
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