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微生物注浆改善某金属矿尾砂性质的试验研究 被引量:12

Improvement of the tailings properties in a metal mine by microbiological grouting
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摘要 为探究微生物诱导CaCO_3沉淀固化土体技术在尾矿砂中应用的可行性,以巴氏芽孢杆菌为优势菌种,采用自行设计的固化反应发生装置,以浸泡的方式对某金属尾矿砂进行加固试验.通过三轴压缩试验测试固化前后尾砂样品力学性质,研究尾砂强度变化规律,同时测定注浆过程中不同时间段CaCO_3生成量,探讨尾砂强度与CaCO_3生成量之间关系.结果表明:在微生物注浆加固14d后,砂柱固化明显,在围压为100kPa下,砂柱直径分别为39.1,50.0,65.0mm的3种尺寸样品的最大轴向应力分别增加了3.06,3.03,2.66倍,最大剪应力分别增加了2.22,2.27,1.96倍;砂柱最大轴向应力和最大剪应力均随注浆时间的增长而增加,均随砂柱样品尺寸的增大而减小;样品中CaCO_3生成量随着固化时间的延长而增加,注浆14d砂柱CaCO_3质量分数可达7.5%左右,同尺寸样品的CaCO_3生成量越大,其三轴测试所得最大轴向应力与最大剪切应力也越大. To explore the feasibility of the application of CaCO3 precipitate solidified soil technology induced by microorganism on tailings sand,by using Bacillus pasteurium as the dominant strain,a self-designed curing reaction generating device was used to carry out the reinforcement test of a metal tailings by means of soaking.The mechanical properties of tailings before and after solidification were tested by triaxial compression test to study the change rule of tailing strength.Meanwhile,the production of CaCO3 during different periods of grouting was measured to explore the relationship between the strength of tailings and the production of CaCO3.The results show that after 14 days of microbiological grouting reinforcement,the sand column solidification is obvious.Under the confining pressure of 100 kPa,the maximumaxial stress of three sizes of sand column with diameter of 39.1 mm,50.0 mm and 65.0 mm increases by 3.06,3.03 and 2.66 times respectively,and the maximum shearing stress increases by 2.22,2.27 and 1.96 times respectively.The maximum axial stress and the maximum shear stress of the sand column rise with the increase of grouting time and fall with the increase of the size of the sand column sample.The production of CaCO3 in the sample grows with the increase of curing time;and the CaCO3 production accounts for around 7.5% after 14 days of grouting.The larger the production of CaCO3 in the same size samples,the greater the maximum axial stress and the maximum shearing stress of the triaxial test.
作者 伍玲玲 张志军 喻清 潘宇翔 胡林 WU Lingling;ZHANG Zhijun;YU Qing;PAN Yuxiang;HU Lin(School of Nuclear Resources Engineering,University of South China,Hengyang,Hunan 421001,China;Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy,University of South China,Hengyang,Hunan 421001,China)
出处 《中国矿业大学学报》 EI CAS CSCD 北大核心 2018年第6期1354-1359,共6页 Journal of China University of Mining & Technology
基金 国家自然科学基金项目(51774187) 湖南省科技厅重点研发计划课题项目(2017SK2280) 湖南省教育厅重点科研基金项目(17A184)
关键词 微生物 注浆 金属尾砂 CACO3 microbes grouting reinforcement metal tailings CaCO3
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