摘要
为探究充填体单轴压缩过程中损伤变量D、比能演化及二者间的关系,以大冶铁矿灰砂比1∶6的充填体为研究对象,开展了单轴压缩及声发射监测试验,计算损伤变量D、总比能U、弹性比能Ue及耗散比能Ud。结果表明,充填体的损伤过程可划分为初始损伤(OA′)、损伤稳定发展(A′B′)、损伤快速发展(B′C′)和损伤破坏(C′点以后段)4个阶段,分别对应压密(OA)、弹性(AB)、屈服(BC)和破坏后(C点以后段)等阶段。损伤变量D在OA段、AB段、BC段和C点以后段分别呈快速增长、缓慢增长、急剧增长、缓慢增长;总比能U和弹性比能Ud不断增大,且增长速率逐渐加快,耗散比能Ue先增大后减小。OA′段,U、Ue和Ud均缓慢增长;A′B′段,U、Ue增长较快,Ud增长较慢;B′C′段,U、Ud快速增长,而Ue增长速率逐渐下降;C′点以后段,U、Ud先快速增长后急剧增长,且Ud增长速率更高,而Ue先缓慢下降后急剧下降。试验充填体Ud随D呈指数增长。
In order to explore damage variable D and specific energy evolution, as well as their relationship for the cemented tailings backfill(CTB) under uniaxial compression, tests of the uniaxial compression of CTB and its acoustic emission(AE) monitoring were conducted for the CTB of Daye Iron Mine with cement-tailings ratio at 1∶ 6. The variable D, the total specific energy U, the elastic specific energy Ue and the specific energy dissipation Ud of the CTB were all calculated. The obtained stress curve map shows that the damage process of backfill is divided into four stages: an initial damage stage(OA′), a stable damage development stage(A′B′), a rapid damage development stage(B′C′) and a failure stage(after C′ point), which correspond to a compaction stage(OA), an elastic stage(AB), a yield stage(BC) and a post-failure stage(after C point), respectively. The variable D increases rapidly at OA stage, slowly at AB stage, sharply at BC stage and slowly at the stage after C point. The total specific energy U and elastic energy Ud increase continuously at an increasing rate, while the energy dissipation Ue decreases after an initial increase. At OA′ stage, the U, Ue and Ud all increase slowly. At A′B′ stage, U and Ue increase faster while Ud increase slower. At B′C′ stage, U and Ud increase rapidly, while Ue increases at a gradual decreasing rate. After C′ point, U and Ud increase rapidly first and then sharply, in which Ud increases at a faster rate, while Ue decrease sharply after an initial slow decrease. Furthermore, Ud increases exponentially with valuable D in the CTB test.
作者
刘艳章
李凯兵
黄诗冰
吴恩桥
李伟
郭赟林
LIU Yan⁃zhang;LI Kai⁃bing;HUANG Shi⁃bing;WU En⁃qiao;LI Wei;GUO Yun⁃lin(School of Resources and Environmental Engineering,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgical Mineral Resources,Wuhan 430081,Hubei,China)
出处
《矿冶工程》
CAS
CSCD
北大核心
2019年第6期1-4,9,共5页
Mining and Metallurgical Engineering
基金
国家自然科学基金(41702291,51604195)
关键词
损伤变量
比能
声发射
单轴压缩
尾砂胶结充填体
damage variables
specific energy
acoustic emission
uniaxial compression
cemented tailings backfill (CTB)
