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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第1期    总第269期    2017年1月

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文章编号:1672-7207(2017)01-0156-06
动载下高浓度全尾砂胶结充填体的力学特性
杨伟,张钦礼,杨珊,王新民

(中南大学 资源与安全工程学院,湖南 长沙,410083)

摘 要: 为了研究动载下高浓度全尾砂胶结充填体(HTB)的力学性能,制备直径×长度为50 mm×25 mm 的HTB试件,通过静态单轴压缩试验和分离式霍普金森杆(SHPB)单轴冲击试验,对试件的动静荷载下的力学性质进行比较,研究试件动态抗压强度、动态应变、强度增强因子、比能量吸收与平均应变率之间的关系。研究结果表明: HTB 试件对弹性波传播有较强的阻尼作用;HTB 试件临界破坏的平均应变率为103 s-1,最大应变率可达265 s-1;随着应变率增大,试件的动态抗压强度、动态强度增长因子、峰值应变随之增大,应变率越高,达到峰值强度历时越短;动载下HTB 试件出现1~2次破坏-压实过程;在低应变率下,试件沿轴向呈现脆性劈裂破坏,在高应变率下,破坏形式为压碎破坏;随着入射能量增大,反射能、试块吸收能量及比能量吸收均呈线性增长趋势,由于波阻抗效应,透射能较小,试块具有较强的吸收和反射能特性。

 

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

Mechanical property of high concentration total tailing cemented backfilling under dynamic loading
YANG Wei, ZHANG Qinli, YANG Shan, WANG Xinmin

School of Resources and Safety Engineering, Central South University, Changsha 410083, China

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.

 

Key words: mining; high concentrations total tailing cemented backfilling; strain rate; split Hopkinson pressure bar (SHPB) test; dynamic mechanics performance

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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