Research On The Thermal Performance And Prediction Of Thermal Conductivity Of Buffer/Backfill Material

In this paper, Hot Disk thermal constants analyzer(type TPS 2500s) is used to study the thermal performance of buffer / backfill materials,providing a basis for practical applications.(1) By experienment, we learn that the relationship between thermal conductivity(thermal diffusivity) of single mineral material is : quartz sand(Q)> pyrite(P)> bentonite(B or XJ Na)> zeolite(Z)> attapulgite(A).(2) Research on the relationship between different factors and thermal conductivity(thermal diffusivity). And experimental equation and several existing models have been used to predict XJ Na, the results show that experimental equation and Kahr model fit the experimental data well. In addition, SPSS is used to analyze the correlation of various factors,so as to establish a multifactorial model of thermal conductivity.(3) Research on thermal performance of double mine(BQ, BZ, BA) and intergrated(BZP,BAP) buffer / backfill material and discuss the relationship between different factors and thermal conductivity(thermal diffusivity) respectively.(4) Univariate prediction method, three-factor and multi-factor prediction methods are used to predict the thermal conductivity of double mine(BQ, BZ, BA) and intergrated(BZP,BAP) buffer / backfill materia,showing that the models fit the experimental datas well.(5) Microscopic model equivalent diagram has been used to discuss and analyze the mechanism between thermal performance of buffer / backfill material and its affecting factors.