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岩石为非均质材料,内部由不同强度的颗粒组成,在单轴压缩过程岩石颗粒参数特性对声发射影响很大。针对这一问题,通过调用FLAC~(3D)内置FISH函数来实现赋予模型随机缺陷材料,并在此基础上记录声发射事件数,本文通过赋予缺陷单元同一参数和随机参数情况进行分析。研究表明:与缺陷参数一致相比,强度参数随机和模量参数随机对声发射表现出不同的特性,前者侧重于对应力峰值处声发射的影响,而后者侧重于声发射初始阶段。探讨岩石材料参数对声发射的影响对分析岩石声发射特征具有重要意义。
Rocks are heterogeneous materials and consist of particles of different intensities inside. The parameters of rock particles in uniaxial compression have a great influence on acoustic emission. In order to solve this problem, the random defect material assigned to the model is built by calling FLAC 3D built-in FISH function. On the basis of this, the number of acoustic emission events is recorded. In this paper, the same parameters and random parameters are given to the defect cells. The results show that the stochastic and modulus parameters of the intensity parameters show different characteristics of acoustic emission randomly compared with those of the defect parameters. The former focuses on the influence of acoustic emission at the peak of stress, while the latter focuses on the initial stage of acoustic emission. Studying the influence of rock material parameters on acoustic emission is of great significance for analyzing the acoustic emission characteristics of rock.