Mechanical properties and synergistic deformation characteristics of tailings cemented filling assembled material body with different cement-tailings ratios
(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)
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.
2021, Vol. 40 
