摘要
为获取不同龄期掺膨润土胶结充填体的稳定状态、二步骤回采时间,确保采场安全,采用RMT-150C岩石力学试验系统进行单轴压缩试验,结合能量耗散原理对数据进行处理,对不同养护龄期掺膨润土胶结充填体的能量耗散规律进行了研究。结果表明:各膨润土掺量的充填体强度与养护龄期表现正相关性,随膨润土掺量增大,强度呈先减小后增大趋势,各掺量充填体的强度均能满足采场充填要求;充填体储能极限与养护龄期遵循二次函数关系式y=a+bx+cx2,掺入膨润土会降低储能极限;充填体峰前能量消耗主要以弹性应变能为主,且随着养护龄期延长而增大,但峰前能耗占比下降;充填体能耗速率与养护龄期呈正相关,而与膨润土掺量呈负相关,膨润土掺量大小对峰前能耗速率影响较小,充填体峰前变形破坏阶段能耗速率略高于峰后能耗速率。
In order to accurately obtain the stable states and two-step mining time of cemented backfill with bentonite at different ages and to ensure the stope safety,the uniaxial compression tests were carried out with RMT-150 C rock mechanics test system,and the obtained data were processed combined with the principle of energy dissipation.The energy dissipation law of cemented backfill with bentonite at different curing ages was studied.The results show that the backfill strength of different bentonite contents has a positive correlation with the curing age.With the increase of bentonite content,the strength decreases first and then increases.The strength of the selected bentonite contents all meet the filling requirements of stope.The relationship between the energy storage limit of backfill and curing age follows the quadratic function formula y=a+bx+cx2.The addition of bentonite will reduce the energy storage limit.The energy consumption of backfill before the peak is mainly elastic strain energy,which increases with the extension of curing age,but the proportion of total energy before peak decreases.The filling energy consumption rate is positively correlated with the curing age and negatively correlated with the bentonite content.The bentonite content has little effect on the energy consumption rate before the peak,and the energy consumption rate in the deformation and failure stage before the peak is slightly higher than that after the peak.
作者
张友锋
付玉华
杨世兴
ZHANG Youfeng;FU Yuhua;YANG Shixing(School of Civil and Environmental Engineering,University of Science and Technology Beijing.Beijing 100083?China;School of Application Sciences,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China;Key Laboratory of Mining Engineering in Jiangxi Province,Ganzhou,Jiangxi 341000,China)
出处
《矿业研究与开发》
CAS
北大核心
2021年第8期52-58,共7页
Mining Research and Development
基金
国家自然科学基金资助项目(51464015)。
关键词
胶结充填体
膨润土掺量
养护龄期
储能极限
能耗速率
Cemented backfill
Bentonite content
Curing age
Energy storage limit
Energy consumption rate
