煤岩“固-气”耦合相似材料力学特性与动态信号试验研究

发布时间：2018-03-25 13:22

本文选题：相似材料　切入点：机械振动　出处：《西安科技大学学报》2017年05期

【摘要】：为进一步研究"固-气"耦合相似材料力学特性,应用正交设计方法,设计5组力学参数相差均匀的材料配比,自行研制煤岩体单轴约束下振动及测试系统,研究了不同振动频率下相似材料力学特性变化规律,实验表明:加载频率为10~60 Hz试件的轴向应变分别在0.74%,0.81%,0.94%,1.02%,1.03%及1.12%时达到峰值,此时压力传感器传输幅值时间变化阈值分别为32,47,52,62,65及95 s.当压力传感器传输幅值为0.2~0.6 N时,试件处于弹性阶段,不断积聚弹性应变能;当压力传感器传输幅值为0.8~1.5 N时,试件处于压力的强度极限,说明试件处于塑形阶段,开始释放弹性应变能。为"固-气"耦合物理相似模拟实验的开展进一步补充了实验基础。
[Abstract]:In order to further study the mechanical properties of similar materials with "solid-gas" coupling, the orthogonal design method was used to design five groups of materials with uniform mechanical parameters, and a system for vibration and measurement of coal and rock mass under uniaxial constraint was developed. The variation of mechanical properties of similar materials at different vibration frequencies has been studied. The experimental results show that the axial strain of the specimen loaded at 1060 Hz frequency reaches its peak value at 0.74 ~ 0.81% 0.92% and 1.12%, respectively. When the transmission amplitude of the pressure sensor is 0.2U 0.6 N, the specimen is in elastic stage, and the elastic strain energy is accumulated continuously, and when the transmission amplitude of the pressure sensor is 0.81.5 N, the time threshold of the pressure sensor transmission amplitude is 32,47,52N and 95 s, respectively, and when the transmission amplitude of the pressure sensor is 0.2U 0.6 N, the elastic strain energy is accumulated continuously, and when the transmission amplitude of the pressure sensor is 0.81.5N. The specimen is at the strength limit of pressure, which indicates that the specimen is in the plastic stage and begins to release elastic strain energy, which further complements the experimental basis for the "solid-gas" coupled physical similarity simulation experiment.
【作者单位】：西安科技大学安全科学与工程学院;教育部西部矿井开采及灾害防治重点实验室;
【基金】：国家自然科学基金科学仪器基础研究专项(51327007);国家自然科学基金(51174157,51304156) 陕西省自然科学基础研究计划(2014KJXX69)
【分类号】：TD315;TD712.61

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