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Çѱ¹Áö¹Ý°øÇÐȸ / v.24, no.2, 2008³â, pp.67-75
Áö¹Ý³» ÀÔÀڰŵ¿ ¹× È帧À» °í·ÁÇÑ ¼ö¾ÐÀÛ¿ë ¸ðµ¨¸µ
( Fluid Injection Simulation Considering Distinct Element Behavior and Fluid Flow into the Ground )
ÀüÁ¦¼º;±è±â¿µ; Çѱ¹¼öÀÚ¿ø°ø»ç ¼öÀÚ¿ø¿¬±¸¿ø;Çѱ¹¼öÀÚ¿ø°ø»ç ¼öÀÚ¿ø¿¬±¸¿ø;
 
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°³º°¿ä¼Ò¹æ¹ýÀº Àç·áÀÇ ¹Ì½ÃÀû °Åµ¿ ¹× ºÒ¿¬¼ÓÀû °Åµ¿°ú °ü·ÃÇÏ¿© Áö¹Ý°øÇÐ ºÐ¾ß¿¡¼­ ±× Ȱ¿ëÀÌ Áõ°¡Çϰí ÀÖÀ¸³ª, ±âÁ¸ °³º°¿ä¼Ò ¹æ¹ýµéÀº ÀÔÀÚÇüÅÂÀÇ Àç·áµé°£ »óÈ£ÀÛ¿ëÀ» À§ÁÖ·Î ¿¬±¸µÇ¾úÀ¸¸ç, ÀÌ´Â Áö¹Ý°øÇÐ ºÐ¾ß¿¡ °³º°¿ä¼Ò ¹æ¹ýÀ» Á¦ÇÑÀûÀ¸·Î Àû¿ëÇÏ´Â ÁÖ¿ä ¿øÀÎÀÌ µÇ¾ú´Ù. ÃÖ±Ù ±âÁ¸ °³º°¿ä¼Ò ¹æ¹ý¿¡ Èë, ¾Ï¹Ý ¹× Åõ¼ö¼º ¸ÅÁú¿¡¼­ÀÇ ¹° È帧À» °í·ÁÇÑ ¼ö¸®¿¬µ¿ ±â¹ýÀÇ Àû¿ë¿¬±¸(Kawaguchi et al., 2003; Shimizu, 2004)°¡ ÁøÇàµÇ°í ÀÖ´Ù. º» ¿¬±¸¿¡¼­´Â ±âÁ¸ °³º°¿ä¼Ò¹æ¹ý¿¡ ¼ö¸®¿¬µ¿ ±â¹ýÀ» Àû¿ëÇÏ¿© ¼ö¾ÐÁ¶°Çº° Áö¹ÝÀÇ °øµ¿»ý¼º ¹× È®Àå¿¡ ´ëÇÑ ¼öÄ¡ÇØ¼®À» ½Ç½ÃÇÏ¿´´Ù. Á÷»ç°¢Çü ÇØ¼®¿ä¼Ò¿¡ ÀÔÀÚÅ©±â¿Í Ãʱ⠰£±Ø·ü Á¶°Ç¿¡ ´ëÇÑ °³º°¿ä¼Ò ¹× °æ°è¸é »ý¼º ÈÄ, ¼­º¸ Á¦¾î¹æ¹ýÀ» ÅëÇÑ °æ°è¸é ÀÀ·ÂÁ¶°ÇÀ» ±¸ÇöÇÏ¿´´Ù. ¼ö¸®°Åµ¿ÀÇ °í·Á´Â ¿¬¼Ó¹æÁ¤½Ä°ú Navier-Stokes ¹æÁ¤½ÄÀ» ÀÌ¿ëÇÏ¿© ¾Ð·Â°ú ¼Óµµ¸¦ ±¸ÇÑ ÈÄ, ÀÔÀÚ¿Í À¯¼ö°£ÀÇ »óÈ£ÀÛ¿ëÀ» Ç®¾î°¡´Â ¹æ½Ä(Tsuji, 1993)À¸·Î ¼öÇàÇÏ¿´´Ù. ±¸¼Ó¾Ð Á¶°Ç($0.1MP{alpha},;0.5MP{alpha}$)¿¡ ´ëÇÏ¿© ÇØ¼®¸ðµ¨ Áß¾ÓÁöÁ¡¿¡ 7´Ü°è·Î Áõ°¡µÇ´Â ¼öÆò¹æÇâ À¯¼ÓÀ» ÀçÇÏÇϰí, ÀçÇÏÁöÁ¡ ÀαÙÀÇ °³º°¿ä¼Ò À̵¿ ¹× ÁöÁ¡º° À¯·®, À¯¼Ó, ¾Ð·Â, °æ°è¸é ÀÀ·Âº¯È­ µîÀ» ºÐ¼®ÇÏ¿´À¸¸ç, ÇØ¼®Á¶°Ç¿¡ µû¶ó °³º°¿ä¼Ò¿Í ¼ö¸® ¿µÇâÀÇ »óÈ£°Åµ¿À» ÅëÇÑ °øµ¿»ý¼º ¹× È®Àå, ÇѰè¾Ð·Â ¹ß»ý µîÀ» È®ÀÎÇÏ¿´´Ù.
It is interesting to note that distinct element method has been used extensively to model the response of micro and discontinuous behavior in geomechanics. Impressive advances related to response of distinct particles have been conducted and there were difficulties in considering fluid effect simultaneously. Current distinct element methods are progressively developed to solve particle-fluid coupling focused on fluid flow through soil, rock or porous medium. In this research, numerical simulations of fluid injection into particulate materials were conducted to observe cavity initiation and propagation using distinct element method. After generation of initial particles and wall elements, confining stress was applied by servo-control method. The fluid scheme solves the continuity and Navior-Stokes equations numerically, then derives pressure and velocity vectors for fixed grid by considering the existence of particles within the fluid cell. Fluid was injected as 7-step into the assembly in the x-direction from the inlet located at the center of the left boundary under confining stress condition, $0.1MP{alpha};and;0.5MP{alpha}$, respectively. For each simulation, movement of particles, flow rate, fluid velocity, pressure history, wall stress including cavity initiation and propagation by interaction of flulid-paricles were analyzed.
 
Ű¿öµå
Cavity initiation;Distinct element method;Fluid coupling;Fluid injection;Fluid scheme;Numerical method;
 
Çѱ¹Áö¹Ý°øÇÐȸ³í¹®Áý / v.24, no.2, 2008³â, pp.67-75
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-2427
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200814364033550)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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