摘要
通过三轴固结不排水剪(CU)试验,得到尾矿试样分别经历1～6次干湿循环作用后的抗剪强度,分析探讨了干湿循环作用对尾矿试样抗剪强度的影响规律。结果表明:尾矿的有效粘聚力c′和有效内摩擦角"′在经历不同次数的干湿循环作用时,具有明显差异性,循环次数达到3次前,两者均有大幅度波动,3次之后略有下降趋势,但下降稳定在一定范围内,较为平缓。分析结果认为:尾矿在经历反复的吸湿-脱湿过程中,水的反复作用引起了试样内部颗粒间结构状态的变化,宏观上表现出在经历不同循环次数时抗剪强度的差异。
Through triaxial consolidated-undrained shear(CU)test,the shear strength of tailings samples after 1 to 6 cycles of drying-wetting cycles was obtained.The influence laws of drying-wetting cycles on the shear strength of tailings samples was analyzed and discussed.The results showed that the effective cohesion c′and effective internal friction angle"′of tailings had obvious differences when they were subjected to different cycles.Before the cycles reached 3 times,both of them fluctuated greatly.After three cycles,there was a slight downward trend,but the decline was stable within a certain range and relatively gentle.The results showed that in the process of repeated hygroscopicity-dehumidification,the repeated action of water caused the changes of the internal particle structure within the samples,which resulted in the differences of shear strength at different cycle times in macroscopic scale.
作者
安鹏飞
窦玫琦
曹兵
魏华
张志军
章求才
伍玲玲
AN Pengfei;DOU Meiqi;CAO Bing;WEI Hua;ZHANG Zhijun;ZHANG Qiucai;WU Lingling(School of Nuclear Resources Engineering,University of South China,Hengyang,Hunan 421001,China;Department of Agriculture and Forestry Engineering,Tangshan Vocational & Technical College,Tangshan, Hebei 063004,China;College of Geography and Tourism,Baoding University,Baoding,Hebei 071000,China;Hunan Province Engineering Technology Research Center of Uranium Tailings Treatment,University of South China,Hengyang,Hunan 421001,China)
出处
《矿业研究与开发》
CAS
北大核心
2019年第1期82-86,共5页
Mining Research and Development
基金
国家自然科学基金资助项目(51774187
51804164)
湖南省重点研发计划项目(2017SK2280)
湖南省教育厅重点科研基金(17A184)
湖南省自然科学基金项目(2018JJ3448)
南华大学研究生科学基金项目(2018KYY152)
关键词
尾矿砂
干湿循环
抗剪强度
固结不排水剪试验
Tailings sand
Drying-wetting cycles
Shear strength
Consolidated-undrained shear test
