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以中国科学院武汉岩土力学研究所研制的RMT-150C岩石力学试验系统为主要试验平台,以宜昌砂岩为研究对象,对砂岩在96 k N峰值、不同频率、不同波形加载下的垂向力变化速率、垂向变形速率、表观弹性模量、横向变形速率、瞬时泊松比与时间的关系等5方面内容进行分析得出不同频率、不同波形对上述关系的影响规律。在提出非滞后时间段内表观弹性模量与垂直力线性关系的基础上,给出不同频率下三角波和正弦波的计算公式及参数,计算和实测对比证明,其计算公式可以很好地拟合不同波形、不同频率下的变形速率随时间的毫秒级变化规律。在此基础上,给出了三角波和正弦波的能量计算方法,对比分析显示,计算公式和方法可以很好地对三角波和正弦波在不同频率和不同加载速度下的能量值作出毫秒级的精确预测。
Taking the RMT-150C rock mechanics test system developed by the Institute of Rock and Soil Mechanics, Chinese Academy of Sciences as the main experimental platform and the Yichang sandstone as the research object, the change of vertical force of the sandstone under 96 kN peak, different frequency and different waveform loading Velocity, vertical deformation rate, apparent elastic modulus, transverse deformation rate, momentary Poisson’s ratio versus time, etc. The influence of different frequencies and different waveforms on the above relationships is analyzed. Based on the linear relationship between apparent elastic modulus and vertical force in the non-lag time, the formulas and parameters of the triangular wave and the sine wave at different frequencies are given. The comparison between the calculated and measured results proves that the formula can be well formulated Combined with different waveforms, different frequencies of deformation rate with time millisecond-level variation. On this basis, the energy calculation method of triangular wave and sine wave is given. The comparative analysis shows that the calculation formula and method can make millisecond precision of the energy value of triangular wave and sine wave under different frequencies and different loading speeds prediction.