弹性范围内不同加载速率下的波速特征及能耗分析

为了探究不同加载速率下波速-应力的变化规律以及能量损耗特征, 采用硬岩材料大理岩进行了单轴压缩下弹性范围内不同加载速率下的试验研究, 测试了加载速率对波速以及能量的影响规律。结果表明, 加载速率的变化不会影响波速-应力之间的总体变化规律, 波速-应力依然符合线性关系, 但低加载速率和高加载速率下的线性关系显现不明显; 不同应力条件下加载速率-波速曲线呈现了3个阶段, 分别为压密-弹性过渡阶段、弹性阶段和弹性-损伤过渡阶段, 整体上加载速率对波速的影响不大; 大理岩在不同阶段吸收的总能量较为稳定, 弹性能在压密-弹性过渡阶段和弹性阶段较为稳定, 而在弹性-损伤过渡阶段出现缓慢的减小, 耗散能在整个阶段都出现了明显的减小。

Wave Velocity Characteristics at Different Loading Rates in Elastic Range and Energy Consumption Analysis

In order to investigate the variation of wave velocity-stress and energy loss at different loading rates, the hard rock marble material was tested under different loading rates in the elastic range under uniaxial compression, and the effect of loading rate on wave velocity and energy was explored. The results showed that the different loading rate did not bring influence on the overall variation law for the wave velocity-stress. It still followed a linear relationship, which, however, was not obvious under low loading rate and high loading rate. The curve of loading rate vs wave velocity under different stress included the following three phases: compaction-elastic transition phase, elastic phase and elastic-damage transition phase. The overall loading rate had little effect on the wave velocity and the total energy absorbed by marble in different phases was relatively stable. The elastic energy was relatively stable in the compression-elastic transition phase and the elastic phase, but slowly reduced in the elastic-damage transition phase. The dissipation energy was significantly reduced throughout the entire phases.