To investigate the creep and instability properties of a cemented gangue backfill column under a high-stress area, the uniaxial compression creep tests were conducted by single-step and multi-step loading of prismatic samples made of cemented gangue backfill material (CGBM) under the high stress-strength ratio. The creep damage was monitored using an electrical resistivity device, ultrasonic testing device, and acoustic emission (AE) instrument. The results showed that the CGBM sample has a creep hardening property. The creep failure strength (CFS) is slightly larger than the uniaxial compressive strength (UCS), ranging in ratio from 108.9% to 116.5%. The instantaneous strain, creep strain, and creep rate increase with increasing stress-strength ratio in the single-step loading creep tests. The instantaneous strain and creep strain decrease first and then increase during the multi-step loading creep process. The axial creep strain of the CGBM column can be expressed by the viscoelastic-plastic creep model. Creep instability is caused by the accumulation of strain energy under multi-step loading and the continuous lateral expansion at the unconstrained middle position during the creep process. The creep stability of a CGBM column in a high-stress area can be monitored based on the variation of electrical resistivity, ultrasonic pulse velocity (UPV), and AE signals.

为了研究水泥石回填柱在高应力区域下的蠕变和不稳定性，通过单步和多步加载由水泥石回填材料（CGBM）制成的棱柱形样品进行单轴压缩蠕变试验。高应力强度比。使用电阻率仪，超声测试仪和声发射（AE）仪器监测蠕变损伤。结果表明，CGBM样品具有蠕变硬化性能。蠕变破坏强度（CFS）略大于单轴抗压强度（UCS），比率范围为108.9％至116.5％。在单步加载蠕变测试中，瞬时应变，蠕变应变和蠕变速率随应力-强度比的增加而增加。在多步加载蠕变过程中，瞬时应变和蠕变应变先减小，然后增大。CGBM柱的轴向蠕变应变可以用粘弹塑性蠕变模型表示。蠕变不稳定性是由于蠕变过程中多步加载下应变能的累积以及在不受约束的中间位置处的连续横向扩展而引起的。可以基于电阻率，超声脉冲速度（UPV）和AE信号的变化来监视CGBM柱在高应力区域中的蠕变稳定性。蠕变不稳定性是由于蠕变过程中多步加载下应变能的累积以及在不受约束的中间位置处的连续横向扩展而引起的。可以基于电阻率，超声脉冲速度（UPV）和AE信号的变化来监视CGBM柱在高应力区域中的蠕变稳定性。蠕变不稳定性是由于蠕变过程中多步加载下应变能的累积以及在不受约束的中间位置处的连续横向扩展而引起的。可以基于电阻率，超声脉冲速度（UPV）和AE信号的变化来监视CGBM柱在高应力区域中的蠕变稳定性。