摘要
针对岩石矿物颗粒之间的相互作用程度不同的特点,采用弯矩贡献因子β模拟了岩石矿物颗粒之间的相互作用力的强弱。依据花岗岩室内单轴压缩试验曲线对细观参数进行了识别。在此基础上,定量研究了β对岩石类材料的变形、强度特征以及微裂纹行为的影响。以4种室内单轴压缩应力应变曲线来验证弯矩贡献因子的适用性。结果表明:β对峰值强度、拉剪裂纹比重以及破坏模式的影响很大;随β的增加,峰值强度呈现线性减小的规律,拉剪裂纹比重呈现指数型增长规律,破坏模式也从对角型破坏面逐渐发展为“V”型破坏面;通过调整β,模拟得到的曲线与室内试验应力应变曲线良好吻合。
We employed the moment contribution factorto simulate the interaction degree among mineral particles of rock mass. The microscopic parameters were identified by the uniaxial compression test curves of Beishan granite. On the basis of this, the influence of moment contribution factor on deformation, strength characteristics and micro-cracking behavior of rock materials were quantitatively studied. Finally, four kinds of laboratory uniaxial compressive stress-strain curves were used to verify the applicability of the. The results showed that had a great influence on the peak strength, ratio of tensile cracks to shear cracks as well as failure mode. With the increase of the, a linear decreasing and exponential growing trends appear for the peak strength and cracks ratio respectively, while the failure mode had also evolved from a diagonal failure surface to a "V" failure surface. Through the adjustment of , the simulated results were in good agreement with the laboratory stress-strain curves.
作者
李勇华
LI Yonghua(Jiangxi provincial Institute of Water Science, Nanchang 330029, China)
出处
《人民长江》
北大核心
2019年第6期198-202,共5页
Yangtze River
关键词
花岗岩
弯矩贡献因子
矿物相互作用
单轴抗压强度
颗粒流法
granite
moment contribution factor
interaction between mineral particles
uniaxial compressive strength
PFC
