基于能量法测量节理岩体品质因子的实验研究

发布时间：2018-07-05 17:43

本文选题：岩石力学 + 节理岩体　；参考：《岩石力学与工程学报》2017年10期

【摘要】：品质因子是衡量岩体中应力波衰减特性的一个重要参数。利用分离式霍普金森压杆实验系统对含人工节理花岗岩试样进行单轴冲击压缩实验,研究节理吻合系数(JMC)对岩体试样品质因子的影响。首先,根据品质因子基本概念得出了利用应力波能量计算品质因子的方法,并证明在试样严格满足应力均匀条件时,其与应力应变曲线方法是等价的。然后,用三波法得到了节理试样的应力应变曲线,同时用应力波能量方法计算了品质因子。实验结果表明:随着节理吻合系数(JMC)降低,应力应变曲线滞回环面积增加,节理岩体试样的动态割线模量和品质因子均减小,说明节理接触面积减小弱化了整个试样并且使试样能量耗散能力增加。
[Abstract]:Quality factor is an important parameter to measure the attenuation characteristics of stress wave in rock mass. The uniaxial impact compression experiments of granite samples with artificial joints were carried out by using a split Hopkinson compression bar system. The effect of JMC on the quality factors of rock samples was studied. Firstly, according to the basic concept of quality factor, the method of calculating quality factor by using stress wave energy is obtained, and it is proved that the method is equivalent to the stress-strain curve method when the specimen satisfies the stress uniformity condition strictly. Then, the stress and strain curves of the jointed specimens are obtained by the three-wave method, and the quality factors are calculated by the stress wave energy method. The experimental results show that with the decrease of joint coincidence coefficient (JMC), the hysteretic loop area of stress-strain curve increases and the dynamic Secant modulus and quality factor of jointed rock mass decrease. The results show that the joint contact area decreases and the energy dissipation capacity increases.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;中国科学院大学;东南大学土木工程学院;东南大学未来地下空间研究院;
【基金】：国家杰出青年基金项目(41525009) 国家自然科学基金重点项目(51439008);国家自然科学基金面上项目(51679231)~~
【分类号】：TU45

【相似文献】