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Experiment Study and Interpretation on Relation between modulus of Rock and Strain Amplitude

Earthquake Research in China 2006年第2期20卷 190-201页

作者： Bao Xueyang Shi Xingjue Wen Dan Li Chengbo Wang Xingzhou School of Earth and Space Science University of Science and Technology of China Hefei 230026 China

Nonlinear elastidty of the earth medium produces a numerical difference between the dynamic and the static modulus of rock. The dynamic modulus is calculated with the ultrasonic velocity measurement, the small-cycle modulus is calculated with small cycles in the load-unload experiment, the static modulus is calculated from the slope of the stress-strain curve in the large cycle, the Young＇ s modulus is obtained from the ratio of stress to strain in the measured point. The relationship between the modulus and the strain amplitudes is studied by changing the strain amplitude in the small cycles. The moduli obtained from different measuring methods are thus compared. The result shows that the dynamic modulus is the largest, the small-cycle modulus takes the second place, the static modulus of bigger-cycle is the third, and finally the Young＇s modulus is the smallest. Nonlinear modulus of rock is a function of the strain level and strain amplitude. The modulus decreases exponentially with the ascending of the strain amplitude, while increases with the ascending of the strain level. Finally, the basic concept of the p-m model is briefly introduced and the relationship between the modulus and strain amplitude is explained by the rock having different distribution densities and the different openand-close stresses of the micro-cracks.

关键词： modulus Small cycle Strain amplitude Strain level p-m model

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