Measurement of seismic quality factor of jointed rock based on stress wave energy
RONG Lifan1，2，LI Jianchun1，3，4，LI Haibo1，LI Zhiwen1，2，HONG Shengnan1，2
(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy of Sciences，Wuhan，Hubei 430071，China；2. University of Chinese Academy of Science，Beijing 100049，China；3. School of Civil Engineering，Southeast University，Nanjing，Jiangsu 210096，China；4. Institute for Underground Space，Southeast University，Nanjing，Jiangsu 210096，China)
摘要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.
Abstract：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.
戎立帆1，2，李建春1，3，4，李海波1，李志文1，2，洪胜男1，2. 基于能量法测量节理岩体品质因子的实验研究[J]. 岩石力学与工程学报, 2017, 36(10): 2474-2483.
RONG Lifan1，2，LI Jianchun1，3，4，LI Haibo1，LI Zhiwen1，2，HONG Shengnan1，2. Measurement of seismic quality factor of jointed rock based on stress wave energy. , 2017, 36(10): 2474-2483.
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2017, Vol. 36 
