摘要
运用岩石破裂过程分析软件RFPA-dynamics,对应力波作用下含颗粒脆性材料的裂纹扩展过程进行了数值模拟,分析了软硬颗粒及双向荷载对裂纹扩展的影响。结果表明:(1)软硬颗粒对裂纹扩展方式有一定影响:表现在硬颗粒模型中,裂纹水平扩展长度较长,且出现羽状结构裂纹,软颗粒模型裂纹水平扩展长度较短,未出现明显羽状裂纹,空洞模型出现裂纹绕行现象;(2)颗粒与基质弹性模量比值是影响含颗粒物的岩石材料裂纹路扩展方式的主要因素,而各自弹性模量绝对值对其影响不大;(3)双向动态荷载作用下,裂纹在分支前均会沿着初始裂缝的方向前进一段距离,不同荷载比率下试样的裂纹扩展方式不同,表现在随着荷载比率增大,裂纹分叉的角度增大,裂纹扩展距离减小。
The influences of soft and hard granules and biaxial load on rock crack propagation mode were studied using Rock Failure Process Analysis( RFPA-dynamics). The results show that crack develops along its initial direction before crack branching. Soft and hard granules have effect on crack propagation mode and crack develops longer with a pinnate structure in hard granule model,while crack develops around hole in hole model. The main factor contributing to the crack branching inside the composite model is not the absolute value of the modulus of the phases but their ratio. Along with the increase of biaxial loading ratio,the crack inclination angle of crack increases and crack length decreases under biaxial dynamic loading.
出处
《地下空间与工程学报》
CSCD
北大核心
2015年第S2期469-473,497,共6页
Chinese Journal of Underground Space and Engineering
基金
国家重点基础研究发展计划(973计划2011CB013503
2014CB047100)
国家自然科学基金(51274053)
关键词
颗粒
动态荷载
数值模型
裂纹扩展
分叉
granule
dynamic loading
numerical simulation
crack propagation
crack branching
