低弹模包体强度对试样破裂模式影响的数值试验  

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

作　　者：刘庭金[1] 唐春安[2] 朱合华[1] 

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]东北大学岩石破裂与失稳研究中心,辽宁沈阳110004

出　　处：《同济大学学报（自然科学版）》2002年第3期263-268,共6页Journal of Tongji University:Natural Science

基　　金：国家重点基础研究发展规划资助项目 (G19980 40 70 0 ) ;国家自然科学基金资助项目 ( 499740 0 9)

摘　　要：应用自行开发的岩石破裂与失稳RFPA2D系统 ,对含低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 ,包体声发射总次数呈明显的下降趋势 ,而包体主破裂位移加载量呈上升趋势 ,试样最大承载力呈上升趋势 ;包体水平轴线上各单元点的剪应力降总是先发生在包体两端位置处 ,当包体强度较小时 ,剪应力降由包体水平轴线中央向其两端扩展 ,当包体强度较大时 。Fracture model of samples with inclusion of low elastic modulus and different strength under the iso-speed displacement load are simulated by using our RFPA 2D code.The results show that with the increase of the inclusion strength,its acoustic emission(AE) total count has a decreasing trend,while its main fracture displacement load and maximal carrying capacity has an increased trend;when the inclusion strength is comparatively low,sheer stress within inclusion horizontal axes decline from center to its two sides,while when inclusion strength is comparatively high,the result is the other way,though the original shear stress decline is always at its boundary.

关 键 词：包体 破裂模式 数值模拟 声发射 剪应力降 地震 孕震模式 强度 数值试验 

分 类 号：P315.72[天文地球—地震学]