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Çѱ¹Áö¹Ý°øÇÐȸ / v.27, no.2, 2011³â, pp.53-62
¼öÁ¤ fluid loss ½ÃÇèÀ» ÀÌ¿ëÇÑ ¿¬Á÷ Â÷¼öº®¿¡ »ý¼ºµÈ º¥Å䳪ÀÌÆ® ÇÊÅÍÄÉÀÍ Æ¯¼º Æò°¡
( Characteristics of Bentonite Filter Cake on Vertical Cutoff Walls Evaluated by Modified Fluid Loss Test )
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¿¬Á÷ Â÷¼öº® ½Ã°ø ½Ã, º¥Å䳪ÀÌÆ® ½½·¯¸®´Â Åä¾çÃþÀ¸·Î ¿©°úµÇ¸é¼­ Â÷¼öº®ÀÇ Ãøº® Ç¥¸é¿¡ ÇÊÅÍÄÉÀÍ ÃþÀ» Çü¼ºÇϰí ÀÌ·¸°Ô Çü¼ºµÈ ÇÊÅÍÄÉÀÍÀº Â÷¼öº®ÀÇ ÀÚü Åõ¼ö°è¼öº¸´Ù ¸Å¿ì ³·Àº °ªÀ» °®´Â´Ù. º» ¿¬±¸¿¡¼­´Â ¼öÁ¤ fluid loss ½ÃÇèÀ» ¼öÇàÇÏ¿© ´Ù¾çÇÑ ÀÛ¿ë¾Ð·Â ÇÏ¿¡¼­ ½½·¯¸®¿ù ½Ã°øÇöÀå¿¡¼­ ÁÖ·Î »ç¿ëµÇ´Â ¼¼ °¡Áö Á¾·ùÀÇ º¥Å䳪ÀÌÆ®·Î Çü¼ºµÈ ÇÊÅÍÄÉÀÍÀÇ Åõ¼ö°è¼ö¸¦ Æò°¡ÇÏ¿´´Ù. ¼öÁ¤ fluid loss ½ÃÇè¿¡¼­´Â ÀϹÝÀûÀÎ ¿¬Á÷ Â÷¼öº® ½Ã°ø Á¶°ÇÀ» ¹Ý¿µÇϱâ À§ÇØ Áß·®ºñ 4, 6, 8% ³óµµÀÇ º¥Å䳪ÀÌÆ® ½½·¯¸®¸¦ Àû¿ëÇÏ¿´´Ù. º¥Å䳪ÀÌÆ® ÇÊÅÍÄÉÀÍÀÇ Åõ¼ö°è¼ö¸¦ ¿¹ÃøÇϱâ À§ÇØ ¼öÁ¤ fluid loss ½ÃÇè °á°ú¸¦ ±âÁ¸¿¡ Á¦¾ÈµÈ µÎ °¡Áö ¹æ¹ýÀ» ÀÌ¿ëÇÏ¿© ÇØ¼®ÇÏ¿´´Ù. º» ¿¬±¸°á°ú·ÎºÎÅÍ Æò°¡µÈ ¼¼ °¡Áö º¥Å䳪ÀÌÆ® ÇÊÅÍÄÉÀÍÀÇ Åõ¼ö°è¼ö´Â $2.15{ imes}10^{-11}m/s$¿Í $2.88{ imes}10^{-10}m/s$ ¹üÀ§·Î ÀÌ´Â ÀϹÝÀûÀÎ ¿¬Á÷Â÷¼öº® µÚä¿òÀçÀÇ ¼³°è°ª º¸´Ù 10-1000¹è °¡·® ÀÛÀ½À» ¾Ë ¼ö ÀÖ´Ù. ¶ÇÇÑ, ÇÊÅÍÄÉÀÍ ³» ÀÀ·ÂºÐÆ÷¿Í ÇÊÅÍÄÉÀÍÀÇ µÎ²²°¡ °¢ Á¶°Ç¿¡ ´ëÇØ ºñ±³µÇ¾ú´Ù.
During the construction of vertical cutoff walls, filtration of bentonite slurry into the adjacent soil formation fabricates a layer of bentonite filter cake on the wall surface. The bentonite filter cake possesses much lower hydraulic conductivity compared to that of backfill materials in the cutoff wall. Hydraulic conductivity of bentonite filter cakes formed with three different types of bentonites has been measured by performing the modified fluid loss test under various pressure levels. Three different mixture ratios, 4, 6, and 8%, were selected for fabricating bentonite filter cakes to represent common field conditions. Two analysis methods for interpreting the experimental data from the modified fluid loss tests were employed to estimate hydraulic conductivity of the bentonite cakes. The range of hydraulic conductivities of the three bentonite cakes is between $2.15{ imes}10^{-11};m/s$ and $2.88{ imes}10^{-10};m/s$ which is 1 to 2.7 orders of magnitude lower than that of the design cutoff wall backfill. The stress distribution and thickness of the bentonite cakes were also evaluated in this paper.
 
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Hydraulic conductivity;Bentonite slurry;Bentonite cake;Filtration;Cutoff wall;Modified fluid loss test;
 
Çѱ¹Áö¹Ý°øÇÐȸ³í¹®Áý / v.27, no.2, 2011³â, pp.53-62
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-2427
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO201116637923619)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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