摘要
为探讨岩石不均质性对岩石破裂过程的影响,采用数值模拟的办法,借助RFPA2D软件开展不同均质度下岩石单轴压缩试验。分析整体均质度对岩石破裂过程的影响,发现应力峰值强度与岩石整体均质度系数m呈正相关,与内部原始缺陷数量呈负相关;均质度系数m增大,裂纹裂隙扩展继承性增强,岩石破坏模式由延性向延-脆性转变,并最终向脆性转变。在此基础上,通过添加矿物夹层的方法改变岩石局部均质度,并分析局部均质度对岩石破裂过程的影响。发现石英矿物夹层使得岩石试件整体的力学性能有所提高,云母矿物夹层则弱化岩石材料的力学性能。相较于石英矿物夹层结构面,软弱的云母矿物夹层结构面对岩石最终破裂形态影响较大。
In order to study the effect of heterogeneity on rock failure process,by means of numerical simulation,uniaxial compression tests of rock with different homogeneity were carried out with RFPA2D software.By analyzing the effect of overall homogeneity on rock failure process,it was found that the peak stress strength was positively correlated with the overall homogeneity coefficient m and negatively correlated with the number of original internal defects.With the increase of homogeneity coefficient m,the inheritance of crack propagation increased,and the failure mode of rock changed from ductility to ductility-brittleness,and finally to brittleness.On this basis,the effect of local homogeneity on rock failure process was analyzed by adding mineral interlayer.The results showed that the overall mechanical properties of rock specimens can be improved by quartz mineral intercalation,while be weakened by mica mineral intercalation.Comparing with structure plane of quartz mineral intercalation,the structure plane of weak mica mineral intercalation had a greater influence on the final fracture pattern of rock.
作者
张艳博
张恩源
孙林
田宝柱
ZHANG Yanbo;ZHANG Enyuan;SUN Lin;TIAN Baozhu(College of Mining Engineering,North China University of Science and Technology,Tangshan, Hebei 063210,China;Hebei Provincial Laboratory of Mining Industry Development with Safe Technology Priority,North China University of Science and Technology,Tangshan,Hebei 063210,China)
出处
《矿业研究与开发》
CAS
北大核心
2019年第9期70-75,共6页
Mining Research and Development
基金
国家自然科学基金资助项目(51574102)
河北省教育厅高校百名优秀创新人才支持计划项目(SLRC2017050)
河北省科技计划项目(16274219)
关键词
岩石材料
非均质性
单轴压缩试验
数值模拟
Rock material
Heterogeneity
Uniaxial compression test
Numerical simulation
