不同温度场下充填体热稳定性特征

Study on Thermal Stability Characteristics of Backfill Under Different Temperature Fields

为揭示不同温度场下粉煤灰尾砂胶结充填体性能演变规律,以粉煤灰尾砂胶结充填体为研究对象,通过控制料浆温度和养护温度,采用单轴压缩试验,探讨了不同温度场下充填体抗压强度与加热时间的关系,以及不同料浆温度下充填体抗压强度与温度场的关系。结果表明,温度场一致时料浆温度越高,充填体抗压强度越大,加热时间越长,充填体抗压强度越小,即料浆温度与充填体抗压强度正相关、加热时间与充填体抗压强度负相关;温度场影响下,高料浆温度充填体的抗压强度均更大,且温度场温度越高,这种效应越显著,料浆温度合理调控对于抵抗高温下充填体强度损耗有积极作用。研究结果可为不同温度差异的尾砂胶结充填提供理论支撑。

In order to reveal the evolution law of the performance of fly ash tailings cemented backfill under different temperature fields,the fly ash tailings cemented backfill was taken as the research object.By controlling slurry temperature and curing temperature and conducting uniaxial compression test,the relationship between compressive strength of backfill and heating time under different temperature fields and the relationship between compressive strength of backfill and temperature field under different slurry temperatures were discussed.The results show that when the temperature field is consistent,the higher the slurry temperature,the greater the compressive strength of the backfill,and the longer the curing time,the smaller the compressive strength of the backfill,that is,the slurry temperature is positively correlated with the compressive strength of the backfill,and the curing time is negatively correlated with the compressive strength of the backfill.Under the influence of temperature fields,the compressive strength of backfill with high slurry temperature is larger,and the higher the temperature field is,the more significant the effect is.The reasonable regulation of slurry temperature has a positive effect on resisting the strength loss of backfill at high temperature.The research results can provide a theoretical support for the cemented filling of tailings under different temperatures.