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Çѱ¹Áö¹Ý°øÇÐȸ / v.19, no.4, 2003³â, pp.167-178
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±¼Âø¼± ÁÖº¯°ø ¹ßÆÄÀÇ ¾Ï¹Ý¼Õ»óÀ» °í·ÁÇÑ ÅͳΠ¾ÈÁ¤¼º °ËÅä
( Tunnel Stability Assessment Considering Rock Damage from Blasting Near to Excavation Line ) |
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| ¹ßÆÄ¼³°è°¡ ÅͳΠ±¼Âø ½Ã ¾Ï¹Ý¼Õ»ó ¹× ¿©±¼¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ºÐ¼®ÇÏ°í ¾Ï¹Ý¼Õ»ó ¹× ¿©±¼ÀÌ ÅͳΠ¾ÈÁ¤¼º¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ºÐ¼®ÇÔÀ¸·Î¼ ¹ßÆÄ¼³°è°¡ ÅͳΠÁöº¸¼³°è¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» ¿¬±¸ÇÏ¿´´Ù. µµ·ÎÅͳÎÀÇ ÀϹÝÀûÀÎ ¹ßÆÄÆÐÅÏ¿¡ ´ëÇØ µ¿Àû¹ßÆÄ ¼öÄ¡ÇØ¼®À» ½ÃÇàÇÏ°í ¿¬¼Óü ¼Õ»ó¿ªÇÐ(continuum damage mechanics)ÀÇ ¼Õ»óº¯¼ö(damage variable)¸¦ ÀÌ¿ëÇÏ¿© ¿©±¼°ú ¾Ï¹Ý¼Õ»ó Á¤µµ¸¦ ºÐ¼®ÇÔÀ¸·Î¼ ÅͳΠ±¼Âø¸é ÁÖÀ§ÀÇ ¾Ï¹Ý¼Õ»ó Á¤µµ¿Í ¿µ¿ªÀ» ±¸ºÐÇÏ¿´´Ù. ¶ÇÇÑ ¹ßÆÄÇÏÁß °°Àº µ¿ÀûÇÏÁßÀÌ ¾Ï¹Ý³»¸¦ ÀüÆÄÇÒ ¶§ º¯ÈÇÏ´Â ¾Ï¹ÝÀÇ µ¿ÀûÆÄ±«±âÁØ¿¡ ´ëÇÑ ¿¬±¸¸¦ ¼öÇàÇÏ¿´´Ù. ¹ßÆÄ ¾Ï¹Ý¼Õ»ó ¿µÇâÀ» ÅͳΠ¾ÈÁ¤¼º ÇØ¼®¿¡ ¹Ý¿µÇϱâ À§ÇÏ¿© ¼Õ»óµÈ ¾Ï¹Ý°¼º°ú ÆÄ±«±âÁØÀ» Àû¿ëÇÏ¿´´Ù. ¼Õ»óµÈ ¾Ï¹Ý°¼ºÀº ¼Õ»ó¿ªÇÐÀÇ °µµ°¨¼Ò ¸ðµ¨À» ÀÌ¿ëÇÏ¿© °¨¼Ò½ÃÄ×´Ù. ¼Õ»óµÈ ¾Ï¹ÝÀÇ ÆÄ±«±âÁØÀº ¾Ï¹Ý°¼º°ú ÁöÁú°µµÁö¼öÀÇ °ü°è½Ä¿¡¼ µµÃâÇÑ ¼Õ»óµÈ ÁöÁú°µµÁö¼ö(GSI$GSI_d$)¸¦ Àû¿ëÇÔÀ¸·Î¼ »êÃâÇÑ ¼öÁ¤ Hoek-Brown ÆÄ±«±âÁØÀ» Àû¿ëÇÏ¿´´Ù. ¾Ï¹Ý¼Õ»óÀ» °í·ÁÇÏ¿© ÅͳξÈÁ¤¼ºÀ» ÇØ¼®ÇÑ °á°ú, ¾Ï¹Ý¼Õ»óÀ» °í·ÁÇÏÁö ¾Ê´Â °æ¿ì¿Í ºñ±³ÇÏ¿© ¼Ò¼º¿µ¿ª ¹üÀ§°¡ È®´ëµÇ°í º¯À§·®ÀÌ Áõ°¡ÇÏ¿´´Ù. ÀÌ´Â ¹ßÆÄ¾Ï¹Ý¼Õ»óÀ» °í·ÁÇÏÁö ¾Ê°í Åͳμ³°è¸¦ ÇÏ´Â °æ¿ì ´Ü±âÀû ȤÀº Àå±âÀûÀ¸·Î ÅͳξÈÁ¤¼ºÀÌ À§Çù¹ÞÀ» ¼ö ÀÖÀ½À» ³ªÅ¸³»¾ú´Ù. |
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| Damage and overbreak of the remaining rock induced by blasting can not be avoided during tunnel construction which may result in either short-term or long-term tunnel instability. Therefore, in this paper, a methodology to take into account the effect of blast-induced damage in tunnel stability assessment is proposed. Dynamic numerical analysis was executed to evaluate damage and overbreak of the remaining rock for the most common blasting pattern in road tunnel. Rock damage was quantified by utilizing the damage variable factor which is adopted proposed in continuum damage mechanics. The damaged rock stiffness and the damaged failure criteria are used to consider the effect of rock damage in tunnel stability analysis. The damaged geological strength index of the damaged rock was newly proposed from the relationship between deformation modulus and geological strength index. Also the Hoek-Brown failure criteria of the damaged rock was obtained using the damaged geological strength index. Analysing the tunnel stability with the consideration of the blast-induced damage of remaining rock, it was found that the extend of plastic zone and deformation increased compared to the undamaged rock. Therefore the short-term or long-term tunnel stability will be threatened when the rock damage from blasting is ignored in the tunnel stability analysis. |
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| Ű¿öµå |
| Blast;Continuum damage model;Hoek-Brown failure criteria;Rock damage;Tunnel stability; |
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Çѱ¹Áö¹Ý°øÇÐȸ³í¹®Áý / v.19, no.4, 2003³â, pp.167-178
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-2427
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200311921886545)
¾ð¾î : Çѱ¹¾î |
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| ³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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