采矿与安全工程学报Issue(5)：840-845,6.DOI:10.13545/j.cnki.jmse.2015.05.022
岩石爆破损伤SPH-FEM耦合法数值模拟分析
Numerical simulation and analysis of blasting process in rock using SPH-FEM coupling algorithm
摘要
Abstract
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.关键词
SPH/FEM/爆破损伤/岩石爆破Key words
SPH/FEM/blasting damage/blast in rock分类
矿业与冶金引用本文复制引用
蔡峰,刘泽功..岩石爆破损伤SPH-FEM耦合法数值模拟分析[J].采矿与安全工程学报,2015,(5):840-845,6.基金项目
国家自然科学基金项目(51304006)；安徽省自然科学基金项目(1408085QE87)；安徽理工大学青年骨干培养基金项目(20120012) （51304006）
