考虑含缺陷岩石的声发射数值模拟研究

NUMERICAL SIMULATION OF ACOUSTIC EMISSION FOR DEFECTIVE ROCK

岩石为非均质材料,内部由不同强度的颗粒组成。研究表明,不同均质性岩石材料在单轴压缩过程的声发射表现出不同的特征,深入研究这些特征对预测岩石破裂有重要的作用。通过编制Fish函数实现随机赋予模型缺陷材料和声发射事件数记录,并内嵌到FLAC3D中模拟均质材料和不同随机缺陷单元数的单轴压缩声发射现象,探讨均质模型和含缺陷模型的声发射差异,以及缺陷数对声发射的影响,研究结果对分析岩石声发射特征具有重要意义。

Rock is a heterogeneous material which consists of grains with different strengths. Studies show that different homogeneous rock materials possess different acoustic emission characteristics in uniaxial compression. Researches of these characteristics have an important role in forecasting rockburst. Fish function is drew to realize model which contains random defect units and records events of acoustic emission. Acoustic emission on homogeneous and random defective material in uniaxial compression is simulated with FLAC3D. The differences of homogeneous model and defective model are discussed,as well as the influence of number of defective units on acoustic emission. Results have an important significance for study of rock acoustic emission characteristics.