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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,建立应力波在一维含软弱夹层岩体中的传播模型,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。
According to the gradual change of the mechanical parameters of the soft interlayer in the rock mass, assuming that the damage degree of the soft interlayer changes according to the law of the quadratic curve, the propagation model of the stress wave in the one-dimensional rock mass with the weak intercalation is established and the variation of the waveform of the stress wave is studied. Dynamic test method of elastic modulus of soft interlayer. Field test results show that when the waveform change coefficient is used to quantify the difference between the calculated waveform and the measured waveform, as the peak damage of the weak interlayer increases, the coefficient of waveform variation first decreases and then increases. When the coefficient of variation of the waveform is minimum, The calculated and measured waveforms on the side are very close to each other. With the increase of the fundamental frequency of the wavelet, the dynamic elastic modulus of the soft interlayer increases approximately linearly, and the static peak elastic modulus of the soft interlayer obtained by linear fitting is 0.74 GPa. Equivalent Principle The equivalent dynamic elastic modulus of the weak interlayer calculated in this experiment is 4.24 GPa. The dynamic modulus of elasticity of the interlayer measured by wave velocity method is 4.70 GPa. The results of wave velocity method are similar to the equivalent dynamic elastic modulus, Method test results are reasonable.