中南大学学报（自然科学版）2017，Vol.48Issue(1)：156-161,6.DOI:10.11817/j.issn.1672-7207.2017.01.022
动载下高浓度全尾砂胶结充填体的力学特性
Mechanical property of high concentration total tailing cemented backfilling under dynamic loading
摘要
Abstract
To study the safety and reliability property of high concentrations of total cemented backfilling (HTB) under dynamic loading,50 mm×25 mm HTB specimen was prepared,the static uniaxial compression test and the split Hopkinson pressure bar (SHPB) uniaxial impact test were carried out,the mechanical properties between static loading and dynamic loading were compared,the relationship among the stress and the strain of dynamic strain,dynamic compressive strength,the strength enhancement factor,the specific energy absorption and the average strain rate of the test specimen was analyzed.The results show that the HTB specimen has stronger damping effect on elastic wave propagation.Strain rate of damage critical is 103 s-1,and the maximum average strain rate can reach 265 s-1.With the increase of the average strain rate,the dynamic compressive strength,the dynamic strength and peak strain increase.The higher the strain rate,the shorter time to get the peak strain.Under the dynamic loading,HTB specimen occur 1-2 times failure-compaction processes.Under the low strain rate,specimens present brittle failure along the axial under higher strain rate,and specimens present crushing destruction.With the increase of the incident energy,reflective energy,absorption energy and specific energy absorption progressively increase.Because of the effect of wave impedance,the transmission energy is much smaller than incident energy.HTB has good energy absorption performance.关键词
矿山开采/高浓度全尾砂胶结充填体/应变率/SHPB试验/动态力学性能Key words
mining/high concentrations total tailing cemented backfilling/strain rate/split Hopkinson pressure bar(SHPB) test/dynamic mechanics performance分类
矿业与冶金引用本文复制引用
杨伟,张钦礼,杨珊,王新民..动载下高浓度全尾砂胶结充填体的力学特性[J].中南大学学报（自然科学版）,2017,48(1):156-161,6.基金项目
国家自然科学基金资助项目(51404305) (Project(51404305) supported by the National Natural Science Foundation of China) （51404305）
