矿产保护与利用2025，Vol.45Issue(1)：1-7,7.DOI:10.13779/j.cnki.issn1001-0076.2024.08.024
聚氯乙烯废塑料对充填体热学性能影响实验研究
Effect of Polyvinyl Chloride Waste Plastic on the Thermal Properties of Backfill
摘要
Abstract
In order to alleviate the heat damage caused by high temperature in deep wells and explore the thermal insulation performance of the polyvinyl chloride(PVC)backfill,thermogravimetry,thermal conductivity,specific heat capacity and micro-morphology of the backfill with 0%～20%PVC powder were measured.The results showed that adding PVC powder can improve the thermal insulation performance of the backfill;PVC particles were combined with the backfill to form a dense and uniform structure.However,due to the weak adhesion of PVC,excessive PVC powder could lead to a loss of adhesion between the components of the backfill,an increase in internal pores and cracks,and a decrease in the compressive strength of the backfill.The compressive strength showed a trend of first increasing and then decreasing with the content of PVC powder.Under the conditions of a slurry mass concentration of 78%,a cement to sand ratio of 1∶4,and a PVC powder replacement cement content of 10%,the backfill had the best performance.At that time,the compressive strength was the highest,at 10.782 MPa,the thermal conductivity was 0.921 W/(m·K),and the decrease was the largest.The specific heat capacity was 1.391 kJ/(kg·K).This article analyzed the thermal properties of PVC powder backfill,providing new ideas for alleviating thermal hazards in deep well mining.关键词
深井开采热害/PVC粉末充填体/热学性能/隔热性能/导热系数Key words
deep well heat damage/PVC powder/thermal performance/thermal insulation performance/thermal conductivity分类
矿业与冶金引用本文复制引用
李婷婷,郭进平,王小林,刘亚雄,侯展娜,吴琼..聚氯乙烯废塑料对充填体热学性能影响实验研究[J].矿产保护与利用,2025,45(1):1-7,7.基金项目
陕西省自然科学基金项目(2024JC-YBQN-0507) （2024JC-YBQN-0507）
国家资助博士后研究人员计划项目(GZC20232063) （GZC20232063）
陕西省博士后科研项目(2023BSHYDZZ142) （2023BSHYDZZ142）
