DYNAMIC TEST METHOD OF SOFT ROCK STRATA ELASTIC MODULUS
WANG Guanshi1，WANG Xingguang1，HU Shili1，2
(1. Jiangxi University of Science and Technology，School of Architectural and Surveying Engineering，Ganzhou 341000，China；
2. China University of Geosciences，School of Engineering and Technology，Beijing 100083，China)
Abstract：The mechanical parameters of weak interlayer in rock mass change gradually. And on this basis， the damage degree of soft interlayer is assumed to change with quadratic curve change rule. We developed the propagation model of stress wave in soft interlayer to analyze the change law of waveform of stress wave and proposed the dynamic test method of elastic modulus of weak interlayer. The field test results indicated that the difference of calculated waveform and measured waveform to the incident side can be considered using coefficient of waveform change of stress wave. With the increase of peak damage degree，waveform change coefficient decreased firstly and then increased. The calculated waveforms to the incident side are close to the measured waveform when waveform change coefficient is lowest. And it almost linearly increased with increasing dominant frequency of wavelet. Through linear fitting，the static peak elastic modulus is computed to be 0.74 GPa. Based on the equal deformation principle，equivalent dynamic elastic modulus of soft rock strata is calculated to be 4.24 GPa. The dynamic elastic modulus of the rock strata is 4.70 GPa using wave velocity method. The testing result of wave velocity is close to the value of equivalent dynamic elastic modulus. The above analysis results indicate that the research method is reasonable.
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2015, Vol. 34 
