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Çѱ¹Áö¹Ý°øÇÐȸ / v.15, no.6, 1999³â, pp.71-86
´Ü°èº° ±¼Âø½Ã ½îÀϳ×Àϸµ º®Ã¼ÀÇ º¯À§¿Í ³×ÀÏÀÇ ÀÎÀå·Â ºÐ¼®
( Analysis of Tensile Force of Nail and Displacement of Soil Nailed Wall at Stepwise Excavation )
Àü¼º°ï; ¿©ÁÖ´ëÇÐ Åä¸ñ°ú;
 
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º» ¿¬±¸´Â ±¹³» 11 ³×Àϸµ ÇöÀåÀ» ´ë»óÀ¸·Î °æ»ç°è¿Í º¯Çü·ü°èÀÇ °èÃøÀڷḦ ÀÌ¿ëÇÏ¿© ½îÀϳ×Àϸµ º®Ã¼ÀÇ º¯À§¿Í ³×ÀÏÀÇ ÀÎÀå·ÂÀ» °íÂûÇÏ¿´´Ù. ¿¬±¸°á°ú ÃÖ´ë¼öÆòº¯À§·®Àº ½Ã°ø°úÁ¤ÀÌ ¾çÈ£ÇÑ ÇöÀåÀÇ °æ¿ì¿Í ºÒ·®ÇÑ °æ¿ì °¢°¢ ±¼Âø±íÀÌ(H)ÀÇ 0.2%, 0.3%ÀÌÇÏ·Î ³ªÅ¸³µÀ¸¸ç, º®Ã¼ÀÇ ÃÖ´ë¼öÆòº¯À§ ¹ß»ýÀ§Ä¡´Â ÁöÇ¥¸éÀ¸·ÎºÎÅÍ ±¼Âø½ÉµµÀÇ ¾à 5~l5%À̳»ÀÇ º®Ã¼»ó´Ü¿¡¼­ ¹ß»ýÇÏ¿´´Ù. ÃÖÁ¾±¼Âø±íÀÌ$(H_f)$¿Í ³×ÀÏÀÇ ±æÀÌ(L)¿ÍÀÇ ±æÀ̺ñ RÀÌ 0.5ÀÌÇÏ, 0.5~0.6, 0.6~0.7ÀÎ °æ¿ì ÃÖ´ë¼öÆòº¯À§°¡ °¢°¢ ±¼Âø±íÀÌ(H)ÀÇ 0.4%, 0.3%, 0.2%·Î ³ªÅ¸³µ´Ù. ±×·¯³ª ±æÀ̺ñ RÀÌ 0.7ÀÌ»óÀÎ °æ¿ì¿¡´Â ÃÖ´ë¼öÆòº¯À§°¡ ±¼Âø±íÀÌÀÇ ¾à0.3%·Î Áõ°¡ÇÏ´Â °ÍÀ¸·Î ³ªÅ¸³µÀ¸¸ç ÀÌ·¯ÇÑ °á°ú´Â ±¼Âø±íÀ̰¡ ¾è°í, Åä»çÃþ ºÎºÐÀÌ ¸¹¾Ò±â ¶§¹®À¸·Î ÆÇ´ÜµÈ´Ù. ÃÖ´ëÀÎÀå·ÂÀ» ¹«Â÷¿øÈ­ÇÑ K°ªÀº ÁöÇ¥¸éÀ¸·ÎºÎÅÍ ÃÖÁ¾±¼Âø±íÀÌ$(H_f)$ÀÇ $0.6H_f$±îÁö´Â 0.8ÀÌÇÏ·Î ³ªÅ¸³µÀ¸¸ç, $0.6H_f$¿¡¼­ºÎÅÍ ÃÖÁ¾±¼Âø¸é±îÁö ¼±ÇüÀûÀ¸·Î °¨¼ÒÇÏ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. ±×¸®°í ÃÖÁ¾±¼Âø¿Ï·á½Ã ³×ÀÏÀÇ ÃÖ´ë ÀÎÀå·Â$(T_{max)$ÀÌ ³×ÀÏÀÇ Ç׺¹ÀÎÀå·Â$(T_{sigmay)$¿¡ ÃÖ´ë 60%±îÁö µµ´ÞÇÏ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù.
The displacements of soil nailed wall and the nail tensile force for 11 soil nailing sites were investigated by using measurements obtained from inclinometer and strain gauge. The maximum horizontal displacement which occurred between 5% and 15% of the final excavation depth was found to be below 0.3% and 0.2% of excavation depth for well and poorly constructed sites. It was also found that the maximum horizontal displacements for 0.4%, 0.3% and 0.2% of excavation depth occurred when the ratios of nail length to final excavation depth were 0.5, 0.5~0.6 and 0.6~0.7. But the maximum horizontal displacement increased by 0.3% of excavation depth when the ratio was above 0.7. This was probably due to the shallow excavation depth and the deep soil stratum. The non-dimensional maximum tensile force of nail, K, from ground surface to $(0.6H_f)$ of the final excavation depth was less than 0.8 and decreased linearly between $(0.6H_f)$ and the final excavation depth. Also, the maximum tensile force was found to reach up to 60% of the ultimate tensile force at final excavation.
 
Ű¿öµå
Soil nailed wall;Nail;Horizontal displacement;Tensile force;Stepwise excavation;
 
Çѱ¹Áö¹Ý°øÇÐȸ³í¹®Áý / v.15, no.6, 1999³â, pp.71-86
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-2427
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO199911921749764)
¾ð¾î : Çѱ¹¾î
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