【摘要】 首先利用损伤力学和统计强度理论研究了煤岩变形破裂过程中三维力学本构关系,得到了一个考虑围压影响的三维本构方程;然后分析了煤岩样品在不同围压条件下变形破裂过程应力随应变而变化的规律,以及由此产生的相应的电磁辐射脉冲数随着应变的变化关系.研究结果表明:围压是通过对煤岩应力场的影响来影响因应力变化而产生的电磁辐射信号的;围压的存在提高了煤岩微元体的破裂强度;对于有围压作用时煤岩体变形破裂过程中产生的电磁辐射脉冲数,其在应变相同时较无围压时要少,并且围压越高影响越大.更多还原

【Abstract】 On the basis of damage characteristic and statistical intensity theory of thebrittle material,e. g. coal or rock,the three-dimensional mechanical relation between stress and strain during the deformation and fracture of coal or rock mono-axial compressed,is researched in this paper. And a 3-D stress-strain relation equation involved in the effect of confining pressure is given. Then the changing laws of stress along with strain and the relation between EME pulse numbers and strain are analyzed when the samples of coal or rock are mono-axial compressed under different confining pressure. The research results show that the electromagnetic emission signal produced is influenced by the stress fields in coal or rock,which is affected by confining pressure;The fracture intensity of coal or rock will increase because of confining pressure;The pulse numbers of EME during deformation and fracture of coal or rock will decrease with the increasing of confining pressure. And the higher the confining pressure is,the bigger the effect degree on EME is.更多还原