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Çѱ¹Áö¹Ý°øÇÐȸ / v.23, no.9, 2007³â, pp.29-37
¼öÃà ±Õ¿­ ¹ß´Þ °úÁ¤À» À§ÇÑ ´Ü¼ø ¸ðµ¨
( A Simple Model of Shrinkage Cracking Development for Kaolinite )
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º» ¿¬±¸¿¡¼­´Â Ä«¿Ã¸°Á¡Åä¿¡ ´ëÇÑ ½Ç³»½ÇÇèÀ» ÅëÇÏ¿© ¼öÃàÀ¸·Î ÀÎÇÑ ±Õ¿­¹ß»ýÀ» Á¶»çÇÏ°í ±Õ¿­ ´Ü°è¸¦ ¸ð»çÇÒ ¼ö ÀÖ´Â ´Ü¼ø¸ðµ¨À» Á¦¾ÈÇÏ¿´´Ù. CPS ±â¹ýÀ» ÀÌ¿ëÇÏ¿© µðÁöÅÐ Ä«¸Þ¶ó¿¡ ÀÇÇØ ¾òÀº ±Õ¿­ À̹ÌÁö¸¦ ºÐ¼®ÇÏ¿´´Ù. ÇÔ¼öºñÀÇ °¨¼Ò¿¡ µû¶ó ±Õ¿­ÀÇ ±æÀÌ¿Í ¸éÀûÀº 1Â÷ ±Õ¿­´Ü°è, 2Â÷ ±Õ¿­´Ü°è, ¼öÃà´Ü°è ±Õ¿­ÀÇ 3´Ü°è·Î ³ªÅ¸³µ´Ù. ±Õ¿­ ¸éÀûÀÇ 1Â÷ ¹× 2Â÷ ±Õ¿­ ÃÖÁ¾ ´Ü°è¿¡¼­ÀÇ Á¤±ÔÈ­µÈ ÇÔ¼öºñ´Â ½Ã·á µÎ²²¿¡ »ó°ü¾øÀÌ °¢°¢ 0.92¿Í 0.70¿¡¼­ ¹ß»ýÇÏ¿´´Ù. ¹Ý¸é ±Õ¿­ ±æÀÌ´Â 1Â÷ ±Õ¿­ ÃÖÁ¾ ´Ü°è¿¡¼­ÀÇ ÇÔ¼öºñ´Â ½Ã·á µÎ²²¿Í »ó°ü¾øÀÌ 0.92¿¡¼­ ¹ß»ýÇÏ¿´À¸³ª, 2Â÷ ±Õ¿­ ÃÖÁ¾ ´Ü°è¿¡¼­ÀÇ ÇÔ¼öºñ´Â ½Ã·á µÎ²²°¡ 0.5, 1.0, 2.0cm·Î Áõ°¡ÇÔ¿¡ µû¶ó ÇÔ¼öºñ´Â 0.79, 0.82, 0.85·Î Áõ°¡ÇÏ¿´´Ù. ¼öÃà ±Õ¿­À» ¸ð»çÇÒ ¼ö ÀÖ´Â 3°³ÀÇ Á÷¼±À¸·Î ±¸¼ºµÈ ´Ü¼ø¸ðµ¨À» Á¦¾ÈÇÏ¿´´Ù.
The experiments have been conducted on Kaolinite in laboratory to investigate the development of shrinkage cracking and propose a simple model. Image analysis method consisting of control point selection(CPS) technique is used to process and analyze images of soil cracking captured by a digital camera. The distributions of crack length increment and crack area increment vary as a three-step process. These steps are regarded as stages of soil cracking. They are in turn primary crack, secondary crack and shrinkage crack stages. In case of crack area, the primary and secondary stages end at normalized gravimetric water content(NGWC) of 0.92 and 0.70 for different specimen thicknesses respectively. In addition, the primary stage in case of crack length also ends at NGWC of 0.92 while the secondary stage stops at NGWC of 0.79, 0.82, and 0.85 for the sample thicknesses of 0.5, 1.0, and 2.0 cm respectively Based on the experimental results, the distributions of crack length increment and crack area increment appear to be linear with a decrease of NGWC. Therefore, the development of shrinkage cracking is proposed typically by a simple model functioned by a combination of three linear expressions.
 
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CPS;Crack area increment;Crack length increment;DIP;Kaolinite;NGWC;Shrinkage cracking;
 
Çѱ¹Áö¹Ý°øÇÐȸ³í¹®Áý / v.23, no.9, 2007³â, pp.29-37
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-2427
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200735822480590)
¾ð¾î : ¿µ¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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