梯度加载下岩爆试验的声发射特性

为了研究岩爆过程中声发射特性参数与岩爆破坏的关系,通过自主研发的岩爆模型试验装置,对大尺寸(1 000mm×600mm×400mm)试件进行岩爆模型试验。采用声发射监测装置,获取了不同加载梯度下岩爆模型试验过程中的声发射监测数据。结果表明:梯度加载过程中,试件的声发射事件数及能量在不同加载时刻有所不同,表现为极大的梯度变化;加载初期,声发射信号极少,岩爆瞬间突变增大,试件集聚的能量越大,更易发生瞬间强烈的岩爆现象;声发射定位点能够反映试件内部裂纹的动态演化过程,梯度加载过程中,声发射定位点的分布及数量能够直观展现岩爆破坏的程度。

Acoustic emission characteristic of rock burst test under gradient load

To study acoustic emission(AE) characteristic parameters of the process of rock burst and the relationship of rock burst damage,the rock burst test for large size specimen(1 000 mm×600 mm×400 mm) was carried out using the self-developped model test device. AE monitoring data was obtained in the process of rock burst under different loading gradients by using AE monitoring devices.Results show that in the process of gradient loading,the number of AE events and the energy of the specimen are different in different loading time,exhibiting great gradient change. In the early stage of loading, the AE signal is very few. The greater the abrupt change of rock burst, the greater the energy of the specimen gathering, and more likely strong rock burst phenomenon occurs in an instant. The AE location point can reflect the dynamic evolution process of the internal crack of the specimen. In the process of gradient loading, the distribution and quantity of AE location point can directly display the degree of rock burst damage.