岩体软弱夹层的弹性模量动力测试方法

doi:10.13722/j.cnki.jrme.2014.0873

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摘要针对岩体软弱夹层的力学参数具有渐变性，假设软弱夹层的损伤度按照二次曲线规律变化，建立应力波在软弱夹层的传播模型，研究应力波的波形变化规律，提出软弱夹层弹性模量的动力测试方法。现场试验研究表明：当采用波形变化系数量化入射侧的计算波形和实测波形差异时，随着软弱夹层峰值损伤度增加，波形变化系数先减小后再增加，波形变化系数为最小值时，入射侧的计算波形和实测波形非常接近；随着子波主频增加，软弱夹层的动态弹性模量近似成线性增加，通过线性拟合求得了软弱夹层的静态峰值弹性模量为0.74 GPa；基于变形相等原则计算得本次试验的软弱夹层的等效动态弹性模量为4.24 GPa，采用波速法测试得夹层动态弹性模量为4.70 GPa，波速法测试结果与等效动态弹性模量相近，表明该方法测试结果合理。

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关键词 ：软弱夹层, 弹性模量, 动力测试, 波形变化

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.

Key words： soft rock strata elastic modulus dynamic test waveform change

引用本文:

王观石1，王星光1，胡世丽1，2 . 岩体软弱夹层的弹性模量动力测试方法[J]. 岩石力学与工程学报, 2015, 34(09): 13-13.
WANG Guanshi1，WANG Xingguang1，HU Shili1，2. DYNAMIC TEST METHOD OF SOFT ROCK STRATA ELASTIC MODULUS. , 2015, 34(09): 13-13.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0873 或 http://www.rockmech.org/CN/Y2015/V34/I09/13

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