【摘要】 回采工作面附近的充填体大都处于循环温度的环境中。为了研究循环温度对尾砂胶结充填体损伤演化及破坏特征的影响，采用数字图像相关法(DIC)和声发射(AE)技术，对6种不同循环温度养护后的尾砂胶结充填体进行单轴压缩试验，分析了不同循环温度下的尾砂胶结充填体的破裂过程及声发射行为特征，并建立了不同循环温度下的尾砂胶结充填体的损伤模型及本构方程。研究结果表明：随循环温度的升高，尾砂胶结充填体的抗压强度、弹性模量及峰值应变均呈现先增大后减小的趋势，且都在循环温度为25～40℃时达到最大值；随着循环温度的升高，尾砂胶结充填体的破坏形式由剪切破坏转变为拉伸-剪切复合破坏，再转变为拉伸破坏；初始压密阶段与峰后破坏阶段的声发射振铃计数信号强弱因循环温度的不同而存在差异，可将声发射振铃计数的突变作为充填体破坏的前兆；通过充填体参数的本构模型理论计算值与试验实测值的对比，验证了模型的可靠性。研究结果可为回采工作面附近充填体的设计提供参考。更多还原

【Abstract】 Most of the backfill near the mining working face are in the environment of cycle temperature. In order to study the influence of cycle temperature on the damage evolution and failure characteristics of cemented tailings backfill, digital image correlation(DIC) and acoustic emission(AE) techniques were used to conduct uniaxial compression tests on cemented tailings backfill after curing at six different cycle temperatures. The fracture process and acoustic emission behavior characteristics of cemented tailings backfill at different cycle temperatures were analyzed, and the damage model and constitutive equation of cemented tailings backfill at different cycle temperatures were established. The results show that with the increase of cycle temperature, the compressive strength, elastic modulus and peak strain of cemented tailings backfill increase first and then decrease, and all reach the maximum value when the cycle temperature is 25-40 ℃. With the increase of cycle temperature, the failure pattern of cemented tailings backfill changes from shear failure to tensile-shear composite failure, and then to tensile failure. The intensity of the acoustic emission ringing count signal in the initial compaction stage and the post-peak failure stage is different due to the different cycle temperature. The sudden change of the acoustic emission ringing count can be used as a precursor to the failure of the backfill. The reliability of the model is verified by comparing the theoretical calculation value of the constitutive model of the backfill parameters with the experimental measured value. The research results can provide reference for the design of backfill near the working face.更多还原