Seismic disturbances frequently trigger or induce violent strainbursts, threatening regular operations and personnel safety in deep underground excavation. We reproduce the cyclic disturbance-induced strainburst, i.e., the strainburst under combined high static stress and cyclic disturbance conditions in the laboratory using a true triaxial testing system with a relatively low stiffness, where the seismic disturbance is simulated by a low-frequency cyclic load. A damage evolution model that enhances the residual strain method is established to quantify the effects of various factors on the damage evolution of this type of strainburst. The energy budget over the development of the cyclic disturbance-induced strainburst is studied, and its energy criterion and magnitude of the kinetic energy release are also discussed. The damage evolution curve of the cyclic disturbance-induced strainburst is typically inverted S-shaped that is well represented by the inverse logistic function with three stages, i.e., initial stage, constant speed stage, and acceleration stage. It is found that the cyclic disturbance can significantly activate and accelerate rock damage, thus inducing a strainburst. The unique underlying reason is that most of the energy input by the cyclic disturbance is dissipated, which degrades the energy storage capacity and strength of the rock. This energy-based failure mechanism is collectively explained as the ‘rock degradation through energy dissipation’ due to the cyclic disturbance.

中文翻译：

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高静应力下低频地震扰动致应变爆裂的岩石损伤与能量平衡

地震扰动经常触发或诱发剧烈的应变爆发，威胁到深部地下挖掘的正常作业和人员安全。我们使用刚度相对较低的真三轴测试系统在实验室中重现了循环扰动引起的应变爆裂，即在高静态应力和循环扰动条件下的应变爆裂，其中地震扰动由低频循环载荷模拟. 建立了增强残余应变法的损伤演化模型，量化了各种因素对此类应变爆发损伤演化的影响。研究了循环扰动引起的应变爆发发展过程中的能量收支，并讨论了其能量准则和动能释放的大小。周期性扰动诱发应变爆发的损伤演化曲线通常呈倒S形，由具有三个阶段的逆逻辑函数很好地表示，即初始阶段、恒速阶段和加速阶段。发现循环扰动可以显着激活和加速岩石破坏，从而诱发应变爆发。其独特的根本原因是循环扰动输入的大部分能量被耗散，从而降低了岩石的储能能力和强度。由于循环扰动，这种基于能量的破坏机制被统称为“通过能量耗散造成的岩石退化”。恒速阶段和加速阶段。发现循环扰动可以显着激活和加速岩石破坏，从而诱发应变爆发。其独特的根本原因是循环扰动输入的大部分能量被耗散，从而降低了岩石的储能能力和强度。由于循环扰动，这种基于能量的破坏机制被统称为“通过能量耗散造成的岩石退化”。恒速阶段和加速阶段。发现循环扰动可以显着激活和加速岩石破坏，从而诱发应变爆发。其独特的根本原因是循环扰动输入的大部分能量被耗散，从而降低了岩石的储能能力和强度。由于循环扰动，这种基于能量的破坏机制被统称为“通过能量耗散造成的岩石退化”。