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Çѱ¹Áö¹Ý°øÇÐȸ / v.18, no.1, 2002³â, pp.5-16
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( The Pullout Behavior of a Large-diameter Batter ]Reaction Piles During Static Pile Load Test for a Large Diameter Socketed Pipe Pile )
±è»ó¿Á;¼ºÀÎÃâ;¹Ú¼ºÃ¶;Á¤Ã¢±Ô;ÃÖ¿ë±Ô; Çö´ë°Ç¼³ Áß¾ÓÇϼöó¸®Àå;°æ¼º´ëÇб³ ´ëÇпø Åä¸ñ°øÇаú;°æ¼º´ëÇб³ ´ëÇпø Åä¸ñ°øÇаú;ºÎ»ê±¤¿ª½Ã °Ç¼³º»ºÎ;°æ¼º´ëÇб³ °Ç¼³¡¤È¯°æ°øÇкÎ;
 
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º» ¿¬±¸¿¡¼­´Â Á÷°æ 1,000mmÀÇ ½ÃÇ踻¶Ò¿¡ ´ëÇÑ ¾ÐÃàÁ¤ÀçÇϽÃÇè ¼öÇà½Ã ¹Ý·Â¸»¶ÒÀ¸·Î »ç¿ëµÈ Á÷°æ 2,500mmÀÇ ´ë±¸°æ °æ»ç¹Ý·Â¼ÒÄϸ»¶ÒÀÇ Àι߰ŵ¿À» ºÐ¼®ÇÏ¿´´Ù. °æ»ç¹Ý·Â¸»¶ÒÀº dzȭ¾ÏÃþ°ú ¿¬¾ÏÃþ 10m¿¡ °ÉÃļ­ ÇöÀ埼³¸»¶ÒÀ¸·Î ¼ÒÄϵǾîÁ³À¸¸ç, °­°üºÎ´Â °­°ü°ú ¼Óä¿òÄÜÅ©¸®Æ®·Î, ±×¸®°í ¼ÒÄϺδ ÄÜÅ©¸®Æ®¿Í ö±ÙÀ¸·Î ±¸¼ºµÇ¾ú´Ù. °¢ ±¸¼ººÎÀç¿¡ ÀÛ¿ëÇÏ´Â º¯ÇüÀ²À» ÃøÁ¤Çϱâ À§ÇØ ¼¾¼­¸¦ ¼³Ä¡ÇÏ¿´À¸¸ç, ¹Ý·Â¸»¶ÒµÎºÎÀÇ Àι߷®À» ÃøÁ¤Çϱâ À§ÇÏ¿© LVDT¸¦ ¼³Ä¡ÇÏ¿´´Ù. Á¤ÀçÇϽÃÇèÁß ÀçÇÏµÈ ÃÖ´ëÀιßÇÏÁßÀº 10MNÀ̾úÀ¸¸ç ÃÖ´ëÀιߺ¯À§´Â 7m, ÀÜ·ùÀιߺ¯À§´Â ÃÖ´ë 1mm Á¤µµ ¹ß»ýÇÏ¿´´Ù. ÀιßÇÏÁßÀÇ 83%¸¦ dzȭ¾ÏÃþ¿¡¼­ ±×¸®°í 12%¸¦ ¿¬¾ÏÃþ¿¡¼­ ÁöÁöÇÏ´Â °ÍÀ¸·Î ³ªÅ¸³µÀ¸¸ç dzȭ¾Ï¿¡ ¼ÒÄÏµÈ Ã¶±ÙÄÜÅ©¸®Æ®ºÎ¿Í ¿¬¾Ï¿¡ ¼ÒÄÏµÈ ÅбÙÄÜÅ©¸®Æ®ºÎ¿¡¼­ °¢°¢ 125.3kPa¿Í 61.8kPaÀÇ ÀιßÀÀ·ÂÀÌ ¹ß»ýÇÏ¿´´Ù. µû¶ó¼­, dzȭ¾ÏÃþ¿¡¼­µµ ÀιßÇÏÁßÀ» ÃæºÐÇÏ°Ô ÁöÁöÇϰí ÀÖÀ¸¹Ç·Î dzȭ¾ÏÃþÀº ¸¶Âû·ÂÀ» Å©°Ô ¹ßÈÖÇÏ´Â ÁöÁöÃþÀ¸·Î »ç¿ëµÇ¾ú´Ù.
The pullout behavior of large-diameter steel pipe piles(diameter = 2,500mm, length = 38~40m), which were designed as compression piles but used as reaction piles during a static compression load test on a pile(diameter = 1,000m, length = 40m), was investigated. The steel pipe piles were driven by 20m into a marine deposit and weathered soil layer and then socketed by 10m into underlying weathered and soft rock layers. The sockets and pipe were filled with reinforced concrete. The steel pipe and concrete in the steel pipe zone and concrete and rebars in the socketed zone were fully instrumented to measure strains in each zone. The pullout deformations of the reaction pile heads were measured by LVDTs. Over the course of the study, a maximum uplift deformation of 7mm was measured in the heads of reaction piles when loaded to 10MN, and 1mm of residual uplift deflection was measured. In the reaction piles, about 83% and about 12% of the applied pullout loads were transferred in the weathered rock layer and in the soft rock layer, respectively. Also, at an uplift force of 10MN, shear stresses due to the uplift in the weathered rock layer md soft rock layer were developed as much as 125.3kPa and 61.8kPa, respectively. Thus, the weathered rock layer should be utilized as resisting layer in which frictional farce could be mobilized greatly.
 
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Frictional force;Instrumented pile;Large-diameter batter reaction piles;Large diameter socketed pipe piles;Pullout deformation;Static pullout pile load test;Weathered rock layer;
 
Çѱ¹Áö¹Ý°øÇÐȸ³í¹®Áý / v.18, no.1, 2002³â, pp.5-16
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-2427
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200211921043922)
¾ð¾î : Çѱ¹¾î
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