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通过在不同应力水平下对岩石试样的加载-卸荷实验,对岩石试件在不同应力状态下受到“加载-卸荷”扰动时的声发射特征进行了试验研究.结果表明:在较低的应力水平下,岩体在受到加载作用时,会产生少量离散的声发射,而在卸载过程中几乎不产生声发射;而在较高的应力水平下,在受到加载扰动作用时,声发射活动相对活跃,而且在卸载时也有明显声发射信号出现.因此,在不同应力水平和应力状态下的声发射信号所反映的是材料不同的本构特征,在进行地下工程原位岩体的稳定性检测与评价时,必须考虑这种特性.
Through the loading-unloading experiments of rock specimens at different stress levels, the acoustic emission characteristics of rock specimens under “loading-unloading” disturbances under different stress conditions were studied. The results show that in the At lower stress level, the rock mass will produce a small amount of discrete acoustic emission when it is loaded, and hardly produce acoustic emission during the unloading process. At higher stress level, under loading disturbance, Acoustic emission activity is relatively active, and there are obvious acoustic emission signals appear at the time of unloading.Therefore, acoustic emission signals under different stress levels and stress states reflect different constitutive features of materials, Stability testing and evaluation, we must consider this feature.