基于RFPA^(2D)的岩石裂纹扩展模式的研究  

Study of Mechanisms of Crack Propagation of Rock Based on RFPA^(2D)

作　　者：钟波波 张永彬[1] 李宏[1] 

机构地区：[1]大连理工大学土木工程学院,大连116000

出　　处：《武汉理工大学学报》2014年第2期82-88,共7页Journal of Wuhan University of Technology

基　　金：国家重点基础研究发展计划("973"计划)(2011CB013503);国家自然科学基金(51179022)

摘　　要：运用岩石破裂过程分析软件——RFPA2D,通过对岩石试样中预置一组裂纹,研究了裂纹几何分布(不同裂纹倾角、不同岩桥倾角)及围压条件对裂纹扩展模式的影响。数值模拟再现了非均匀岩石介质中多裂纹扩展的相互作用模式及其贯通机制。结果表明:1)预置裂纹的几何分布对裂纹贯通机制有显著影响。2)随着裂纹倾角的增大,试样的平均峰值强度明显增加,当裂纹倾角较大(75°左右)时,峰值强度接近无预置裂纹试样。3)随着围压的增大,剪破裂明显增多,剪裂纹对扩展模式起主导作用。在高围压条件下,试样的破裂形式与在低围压下显著不同,且与均质试样的破裂形式也有显著不同。The influences of fracture geometric distribution conditions and confining pressure conditions on rock crack propagation mode were studied by rock samples with pre-existing cracks using Rock Failure Process Analysis （RFPAZD）. Numerical simulation reproduced crack propagation mode and crack coalescence mechanism of heterogeneous rock medi- um. The results show that the coalescence mechanisms of crack is controlled by the geometric distribution of crack. With the increase of inclination angle of crack, the average peak intensity of the sample increases. When the inclination angle of crack becomes large, the peak intensity gets close to the no pre-existing crack sample. With the increase of confining pres- sure, the shear fracture significantly increases, shear cracks play a dominant role in the crack propagation mode. Com- pared with the rupture form of the sample under low confining pressure and a homogeneous sample, that of the sample under high confining pressure is significantly different.

关 键 词：裂纹扩展 裂纹几何分布 非均匀性 数值模拟 

分 类 号：P584[天文地球—岩石学]