高弹模包体强度对试样破裂模式影响数值试验

Numerical Test of Inclusion Strength Influence on Fracture Model of Specimen with High Elastic Modulus Inclusion

应用东北大学岩石破裂与失稳研究中心开发的RFPA2D系统 ,对含高弹模不同强度的包体试样的破裂模式进行了数值试验 .结果表明 :随着包体强度的增大 ,包体主声发射位移加载量呈上升趋势 ;试样最大承载力和临界应力呈上升趋势 ,残余承载力呈下降趋势 ;当包体与母岩强度接近时 ,包体破裂程度低 ,主声发射频度低 ;当包体与母岩强度相差较大时 ,包体破裂程度高 ,主声发射频度高 ;当包体强度较小时 ,剪应力降由包体垂直轴线中央不断向其两端扩展 ,而当包体强度较大时 ,剪应力降由包体垂直轴线的两端向其中央扩展 .

Fracture model of samples with inclusion of high elastic modulus and different strength are simulated by using Northeastern University Centre of Rock Induced Seismicity Research(CRISR) RFPA 2D code.The results show that:with the increase of inclusion strength,its maximal bearing capacity and its main fracture displacement load have an increased trend,while its remnant bearing capacity has a declining trend;when inclusion strength is comparatively low,shear stress within inclusion vertical axes declines from center to its two sides,however,when inclusion strength is comparatively high,the result is the other way,though original shear stress decline is always at its boundary.