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| Mechanical properties and synergistic deformation characteristics of tailings cemented filling assembled material body with different cement-tailings ratios |
| ZHAO Kang1，2，HUANG Ming1，YAN Yajing1，WAN Wenliang1，NING Fujin1，
ZHOU Yun1，HE Zhiwei1 |
| (1. School of Architectural and Surveying and Mapping Engineering，Jiangxi University of Science and Technology，Ganzhou，Jiangxi 341000，China；2. Lingbao Jinyuan Mining Company Limited，Sanmenxia，Henan 472500，China) |
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Abstract In order to study the mechanical properties and synergistic deformation characteristics of the tailings cemented filling material assembled with various cement-tailings ratios，the uniaxial compression test was used to study two different cement-tailings ratios assemblies. Experimental results show that：(1) the overall peak strength of assembled material body depends on the peak strength of the small cement-tailings ratio specimen. When the peak strength of the small cement-tailings ratio specimen is close to the proportional ultimate strength of the large cement-tailings ratio specimen，the overall peak strength of the assembled material body is reduced by 29.22%. The smaller the peak strength ratio of the two specimens is，the larger the overall elastic modulus of the assembled body. The Poisson?s ratio of the specimen with a large cement-tailings ratio becomes smaller，while becomes larger with a mall cement-tailings ratio，with the peak strength ratio of the two specimens in assembled body. (2) The stress-strain curve of the assembled backfill body is similar to the curve of the specimen with a smaller peak strength in terms of value and change trend. The failure mode is mainly manifested as the shear failure and tension failure penetrated in the specimen with a small cement-tailings ratio. Although the failure deformation of two specimens in the assembled body shows a certain hysteresis in time，its synergistic deformation characteristics are obvious. (3) The acoustic emission of the assembled body with different cement-tailings ratios has different activity characteristics in the four stages and the stress peak lags behind the peak of acoustic emission ringing count. The count peaks of the large cement-tailings ration specimens in the assembled body account for 13.77%，14.16% and 6.56% of the corresponding small cement-tailings ratio ones. As the strength ratio of the assembled body increasing，the acoustic emission ringing count of the combination decreases gradually.
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2021, Vol. 40 
