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Çѱ¹Áö¹Ý°øÇÐȸ / v.13, no.4, 1997³â, pp.149-162
ºñƲ¸²Àü´Ü½ÃÇè¿¡ ÀÇÇÑ ¸ð·¡ÀÇ °­µµÆ¯¼º
( Strength Characteristics of Sand in Torsion Shear Tests )
³²Á¤¸¸;È«¿øÇ¥;ÇÑÁß±Ù; Á¦ÁÖ´ëÇб³ ÇØ¾ç°úÇдëÇÐ ÇØ¾çÅä¸ñ°øÇаú;Áß¾Ó´ëÇб³ °ø°ú´ëÇÐ °Ç¼³È¯°æ°øÇаú,, Áß¾Ó´ëÇб³ ±â¼ú°úÇבּ¸¼Ò;;
 
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ÁÖÀÀ·ÂȸÀü½Ã ¸ð·¡ÀÇ °­µµÆ¯¼ºÀ» ¿¬±¸Çϱâ À§ÇÏ¿© ÀÏ·ÃÀÇ ÀÀ·Â°æ·Î¿¡ ´ëÇØ ½ÃÇèÀ» ½Ç½ÃÇÏ¿´´Ù. ÀÌµé °á°ú´Â °ø½ÃüÀÇ ³ôÀÌ¿¡ µû¶ó 25cm¿Í 40cm·Î ºÐ·ùÇÒ ¼ö ÀÖÀ¸¸ç °ø½Ãü¿¡ ÀÛ¿ëµÈ Å丣 Å©(Torque)´Â ½Ã°è¹æÇâÀ¸·Î¸¸ ÀÛ¿ë½ÃÄ×´Ù. º» ¿¬±¸¿¡¼­´Â ºñ Ʋ¸²Àü´Ü½ÃÇè½Ã ÁÖÀÀ·Âºñ¿¡ ´ëÇÑ ¸ð·¡ÀÇ °­µµÆ¯¼ºÀÌ Á¶»çµÇ¾ú°í ±× °á°ú¸¦ LadeÀÇ ÆÄ±«±ÔÁذú ºñ±³ÇÏ¿© º¸¾Ò´Ù. ±×¸®°í °ø½Ãü³ô ÀÌ¿¡ ´ëÇÑ ¿µÇâÀ» °í·ÁÇÏ¿´´Ù. ÀÌµé ½ÃÇè°á°ú·Î ºÎÅÍ ¸ð·¡ÀÇ ³»ºÎ¸¶Âû°¢Àº ÃàÂ÷ÁÖÀÀ·Âºñ $b:(sigma_2 -sigma_s)/(sigma_2,-sigma_3)$¿¡ ¸¹Àº ¿µÇâÀ» ¹Þ´Â °ÍÀ¸·Î ³ªÅ¸³µ´Ù. ¸ð·¡ÀÇ ÆÄ±«°­µµ´Â ÀÀ·Â°æ·Î¿¡ ¿µÇâÀ» ¹ÞÁö ¾Ê°í ÇöÀçÀÇ ÀÀ·Â»óÅ¿¡ ÀÇÇØ °áÁ¤ µÇ¾îÁö¸ç 25cm¿Í 40cm ³ôÀÌÀÇ °ø½Ãü¿¡ ´ëÇÑ ºñ±³·ÎºÎÅÍ ´ÜºÎ±¸¼ÓÀÇ ¿µÇâÀº ¹ß°ßÇÒ ¼ö ¾ø¾ú´Ù. ±×¸®°í ½ÅÀå·ÂÀÌ ÀÛ¿ëµÈ b=0.5 ÀÌ»óÀÎ ½ÃÇè¿¡¼­´Â º¯ÇüÀ» ±¹ºÎÇö»ó¿¡ ÀÇÇÑ NeckingÇö»óÀÌ ¹ß°ßµÇ¾ú´Ù.
A series of torsion shear tests were performed to study the strength characteristics of sand under various stress paths during rotation of principal stress. These results can be classified into two groups of 25cm and 40cm according to the height of specimen, and toy que was applied only in the clockwise direction. In this study, strength characteristics of sand for the principal stress ratio in torsion sheartests were investigated and their results were compared with Lade's failure criterion. And the effect for specimen was considered. From the results of tests, friction angle of sand was affected by the deviatoric principal stress ratio $b:(sigma_2 -sigma_s)/(sigma_2, -sigma_3)$Failure strength of sand was determined not by the stress paths but by the current stress state. From comparison of specimens on 25cm and 40cm height, effect of end restraint could not be found. In the test where b is over 0.5 due to extension force, necking phenomenon by the strain localization was found.
 
Ű¿öµå
Torsion shear test;Principal stress rotation;Plastic strain incremental vector;Stress path;Stress level;
 
Çѱ¹Áö¹Ý°øÇÐȸÁö:Áö¹Ý / v.13, no.4, 1997³â, pp.149-162
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-215X
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO199711920447559)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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