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用线性变形节理描述宏观节理的变形特性,在节理的法线方向布置一条测线,测线上在节理两侧分别布置一个测点,用以记录入射侧和透射侧的波形,结合应力波垂直通过单一线性变形节理的透射系数和反射系数,利用透射侧波形的频谱,可以得到入射侧测点处波形的计算频谱,令入射侧波形的频谱与计算频谱相等,提出应力波垂直入射时基于频谱测试节理刚度的方法。通过FLAC3D模拟,验证刚度测试方法的合理性,并分析入射波的峰值频率、节理刚度和节理两侧岩石的弹性模量对测试误差的影响,结果发现,节理刚度越大,测试误差越小;弹性模量越大,测试误差越大;峰值频率对测试结果影响较小;不同工况下,均具有较高的计算精度。在德兴铜矿露天开采临时边坡面上选择一个两侧岩体相对完整、所在坡面比较平整的宏观节理,进行了9次试验,9次试验的测试结果相近,9次试验的法向刚度测试值的方差为0.72,切向刚度测试值的方差为0.56,说明节理刚度测试方法具有稳定性高的特点。
A linear deformation joint is used to describe the deformation characteristics of the macro joints. A measurement line is arranged in the normal direction of the joints. A measuring point is arranged on both sides of the joint line for recording the waveforms on the incident side and the transmission side. Combined with the stress wave vertical Through the transmission coefficient and the reflection coefficient of the single linear deformation joint, the calculated spectrum of the waveform at the incident side can be obtained by using the spectrum of the transmitted waveform. The spectrum of the incident waveform is equal to the calculated spectrum. At last, Method of testing joint stiffness. Through the FLAC3D simulation, the rationality of the stiffness test method is verified, and the influence of the peak frequency, the joint stiffness and the elastic modulus of the rock on both sides of the incident wave on the test error is analyzed. The results show that the larger the joint stiffness is, the less the test error is. The greater the elastic modulus, the greater the test error; the smaller the peak frequency has little effect on the test results; the higher the calculation accuracy under different conditions. In Dexing copper mine temporary slope side of the face to select a rock on both sides of the relative integrity of the rock, the slope is relatively flat macroscopic joints, carried out 9 tests, 9 tests of the test results are similar to 9 tests of the normal The variance of the stiffness test value is 0.72, and the variance of the tangential stiffness test value is 0.56, which shows that the joint stiffness test method has the characteristics of high stability.