CAJ | 학술논문

耦合SPH和FEM是一种有效岩石爆破损伤的数值模拟方法。本文建立了爆破损伤本构方程和爆破过程的 SPH-FEM 耦合算法，并利用此本构方程和 SPH-FEM 耦合法对无结合面和有结合面的2种岩石模型的数值模拟计算分析，研究获得了爆生裂纹发育规律和爆生气体对岩石的作用方式、过程和效果。研究结果表明：高压爆生气体先后经历高压膨胀并冲击孔壁、反射、再压缩、再膨胀冲击孔壁、再反射的反复过程，由此形成一系列膨胀波对岩石孔壁进行多次冲击；岩石内微裂纹的生成过程存在着7个关键时间节点，爆生气体对裂纹的发育和生长有4方面的影响：1)直接冲击孔壁形成破碎区和主要的径向裂纹；2)驱动这些径向裂纹生长；3)形成的应力波在岩石内部形成裂纹；4)应力波在岩石外表面反射和叠加形成裂纹并造成表面剥落。径向裂纹的生长速度要慢于应力波的传播速度，且其生长取决于4个影响因素。
우합SPH화FEM시일충유효암석폭파손상적수치모의방법。본문건립료폭파손상본구방정화폭파과정적 SPH-FEM 우합산법，병이용차본구방정화 SPH-FEM 우합법대무결합면화유결합면적2충암석모형적수치모의계산분석，연구획득료폭생렬문발육규률화폭생기체대암석적작용방식、과정화효과。연구결과표명：고압폭생기체선후경력고압팽창병충격공벽、반사、재압축、재팽창충격공벽、재반사적반복과정，유차형성일계렬팽창파대암석공벽진행다차충격；암석내미렬문적생성과정존재착7개관건시간절점，폭생기체대렬문적발육화생장유4방면적영향：1)직접충격공벽형성파쇄구화주요적경향렬문；2)구동저사경향렬문생장；3)형성적응력파재암석내부형성렬문；4)응력파재암석외표면반사화첩가형성렬문병조성표면박락。경향렬문적생장속도요만우응력파적전파속도，차기생장취결우4개영향인소。
SPH-FEM coupling algorithm is an effective numerical simulation method for rock blasting damage. The current paper has built a group of constitutive equations and SPH-FEM coupling algorithm. And these constitutive equations and SPH-FEM coupling algorithm have been used to simulate blasting in rock under two conditions of rock specimen with and without joint-face. The acting processes and acting results of blasting gas on the laws of blasting cracks growth have been obtained. The research re-sults have shown that the high-pressure blasting gas successively experiences a series repeating processes of high-pressure expanding and hits the hole wall, reflecting, re-pressurized, re-expanding and re-hit the hole wall, and this has generated a series of expanding waves and hits on the hole wall;there are 7 key time nodes during the births of cracks, and there are 4 main impacts of blasting gas on the growth of cracks:1) directly hit the hole wall and generate crashed area and main radial cracks, 2) drive these radial cracks growing, 3) generated blasting stress waves generate cracks in inner rock, 4) these blasting stress waves are reflected and overlapped, and it leads to surface spalling at the free surface of rock;the growing speed of radial cracks is slower than propagation speed of blasting stress waves, and growing speed of radial cracks depends on 4 influential factors.