基于能量法测量节理岩体品质因子的实验研究  

Measurement of seismic quality factor of jointed rock based on stress wave energy

作　　者：戎立帆 李建春[1,3,4] 李海波 李志文[1,2] 洪胜男 

机构地区：[1]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,湖北武汉430071 [2]中国科学院大学,北京100049 [3]东南大学土木工程学院,江苏南京210096 [4]东南大学未来地下空间研究院,江苏南京210096

出　　处：《岩石力学与工程学报》2017年第10期2474-2483,共10页Chinese Journal of Rock Mechanics and Engineering

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)~~

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。The seismic quality factor is commonly used to describe the attenuation characteristics of stress wave propagation across rock masses. In order to research the influence of Joint Matching Coefficients（JMCs） on the seismic quality factor Qs of jointed rock mass,a series of uniaxial impact compression experiments were conducted on the granite specimens containing artificial joint by using the apparatus of split Hopkinson pressure bar（SHPB）. A method to calculate the seismic quality factor is proposed based on the variation of stress wave energy and conformed to the concept of seismic quality factor. The method is proved to be equivalent to the stress-strain method on the condition that the stresses on the specimen are uniform. The stress-strain curves were calculated through the three-wave method,while the seismic quality factor of the specimen was calculated with the energy method. The experimental results show that both the dynamic secant modulus and quality factor decrease with the decrease of joint matching coefficient,indicating that a joint with smaller contact area weakens the whole specimen,but enhances the ability of energy dissipation.

关 键 词：岩石力学 节理岩体 品质因子 应力波能量衰减 节理吻合系数 

分 类 号：TU45[建筑科学—岩土工程]