基于声发射参量的不同深度灰岩塑性破坏识别研究

发布时间：2018-11-21 17:21

【摘要】：对某矿深部灰岩进行单轴压缩试验,测得试件破坏全过程的应力、应变和声发射参数。通过分析应力、应变和声发射参数之间的关系,可根据声发射振铃计数率的变化情况,将全过程分为三个阶段:第一阶段处于孔隙裂隙压密阶段,振铃计数率较多;第二阶段处于稳定变形阶段,声发射处于平静期;第三阶段岩石进入塑性变形阶段,振铃计数率明显增加。研究发现,深度越深,第一阶段终止时的应力水平越高;将声发射累计能率与累计振铃计数率的比值定义为能振比λ,λ的变化规律一定程度上反映出试件内部裂隙发展情况。研究λ的变化规律能够为识别岩体失稳提供依据,提高声发射技术监测预报的准确性。
[Abstract]:Uniaxial compression tests were carried out on the deep limestone of a certain mine, and the stress, strain and acoustic emission parameters of the specimen during the whole process of failure were measured. By analyzing the relationship between stress, strain and acoustic emission parameters, the whole process can be divided into three stages according to the change of the counting rate of acoustic emission ringing: the first stage is in the stage of pore crack compaction, and the ringing counting rate is more; The second stage is in the stable deformation stage, the acoustic emission is in the calm stage, and the third stage the rock enters the plastic deformation stage, the ringing counting rate increases obviously. It is found that the deeper the depth is, the higher the stress level is at the end of the first stage, and the ratio of accumulative energy rate of acoustic emission to the counting rate of accumulative ringing bell is defined as the ratio of energy to vibration ratio 位, and the variation law of 位 reflects the development of fracture in the specimen to some extent. The study of 位 variation law can provide the basis for identifying rock mass instability and improve the accuracy of acoustic emission monitoring and prediction.
【作者单位】：江西理工大学资源与环境工程学院;
【基金】：国家自然科学基金项目(No.51304083) 江西省科技支撑计划(No.20141BBE50005)
【分类号】：TU45

【相似文献】