文献类型：期刊文献

中文题名：高低应力水平下胶结充填体蠕变特征及分数阶本构模型

英文题名：Creep characteristics and fractional order constitutive model of cemented backfill under high and low stress levels

作者：程爱平 付子祥 邓代强 戴顺意 黄诗冰 叶祖洋

第一作者：程爱平

机构：[1]武汉科技大学资源与环境工程学院,湖北武汉430081;[2]湘潭大学土木工程与力学学院,湖南湘潭411105;[3]贵州理工学院矿业工程学院,贵州贵阳550003

第一机构：武汉科技大学资源与环境工程学院,湖北武汉430081

年份：2023

卷号：52

期号：2

起止页码：276-285

中文期刊名：中国矿业大学学报

外文期刊名：Journal of China University of Mining & Technology

收录：CSTPCD;;EI(收录号：20231914058647);Scopus(收录号：2-s2.0-85156263658);北大核心:【北大核心2020】；CSCD:【CSCD2023_2024】；

基金：国家自然科学基金项目(51604195,51764009);贵州省科技支撑计划项目(黔科合支撑[2018]2836);湖北省自然科学基金项目(2018CFC818);金属矿山高效开采与安全教育部重点实验室开放基金项目(ustbmslab201704)。

语种：中文

中文关键词：胶结充填体;蠕变;低应力水平;高应力水平;灰砂质量比;本构模型

外文关键词：cemented backfill;creep;low stress level;high stress level;cement-tailings ratio;constitutive model

摘要：胶结充填体在采场中会经历不同应力水平的长期荷载作用,其不同应力水平下的蠕变特征直接影响矿山的安全生产.基于此,本研究制备了不同灰砂质量比的胶结充填体试样,进行了单轴压缩与分级蠕变试验,获取了不同应力水平下胶结充填体蠕变变形规律,探讨了胶结充填体在低应力水平与高应力水平下的蠕变特征,构建了胶结充填体分数阶蠕变本构模型,并进行了验证.研究结果表明:胶结充填体的蠕变特征是其在蠕变过程中内部应力的不断调整、硬化与损伤共同作用所产生的结果;低应力水平下,胶结充填体蠕变全过程中硬化作用占据主导,其中减速蠕变阶段硬化特征最为显著;高应力水平下,胶结充填体蠕变全过程中损伤作用占据主导,其中加速蠕变阶段损伤特征最为显著;同一应力水平下,灰砂质量比越低的胶结充填体蠕变全过程中硬化-损伤作用越明显,即抵抗变形能力的提升与损伤累积的速度越明显;构建的胶结充填体分数阶蠕变本构模型与各试验数据均有较高吻合度,且较好地表征了胶结充填体在不同应力水平下的蠕变特征.研究成果可为提高胶结充填体稳定性和矿山安全生产提供理论依据.
The cemented backfill will experience long-term load at different stress levels in the stope,and its creep characteristics at different stress levels will directly affect the safety production of the mine. Based on this,the cemented backfill samples with different cement-tailings ratio were prepared to conduct uniaxial compression and graded creep tests. The creep deformation laws of cemented backfill under different stress levels were obtained to discuss the creep characteristics of cemented backfill at low and high stress levels. A fractional order creep constitutive model of cemented backfill was constructed and verified. The results show that the creep characteristics of cemented backfill are caused by the continuous adjustment of internal stress,hardening and damage during the creep process. At the low stress level,the hardening effect dominates the whole creep process of cemented backfill,which is most obvious in the deceleration creep stage. At the high stress level,the damage effect dominates the whole process of creep,which is most obvious in the accelerated creep stage. At the same stress level,the hardening and damage effect of cemented backfill with lower cement-tailings ratio is more obvious,which means the improvement of resistance to deformation and the speed of damage accumulation are more obvious. The fractional order creep constitutive model of cemented backfill is in good agreement with the test results,and better characterizes the creep characteristics of cemented backfill under different stress levels. The research results can provide a theoretical basis for improving the stability of cemented backfill and mine safety production.