Research progress on test methods for measuring tensile strength of cemented tailings backfill
The utilization of cemented tailings backfill technology plays a pivotal role in achieving eco-friendly mining of metal ores.The tensile strength of the cemented tailings backfill is a crucial factor that influences its stability and guarantees safe and effective mining with backfill in adjacent stopes.Ensuring rational mine backfill design requires accurate measurement of cemented tailings backfill tensile strength.Cemented tailings backfill,due to its low-strength characteristics,lacks a unified test method or standard for its tensile properties in China.This article presents a systematic review of the application of tensile strength test methods for cemented tailings backfill.It also identifies the current issues with the existing testing methods referenced from concrete,geotechnical engineering,and other fields.The recent developments in the field of tensile testing methods were discussed in this article,focusing on three aspects:direct and indirect test methods,as well as innovations in test methods for measuring the tensile strength of cemented tailings backfill.Firstly,four direct tensile test methods and their application scenarios are systematically sorted out and summarized,and then three indirect tensile test methods and their application conditions are studied and analyzed,and the advantages and disadvantages of the two different types of test methods are compared and analyzed.Based on research and analysis of the above test methods,Prof.Guo of BGRIMM developed a new method of testing the tensile strength of cemented tailings backfill.This method involves using a compression to tensile load converter on dog-bone-shaped specimens,which enables direct tensile strength testing through uniaxial compression.The innovation takes into account the mechanical characteristics of the cemented tailings backfill and provides more accurate results.The method has been scientifically verified by relevant mines and research institutes in China and Canada for evaluating the tensile properties of cemented tailings backfill.It has been adopted by Paterson and Cooke,an international mine backfill consultancy firm,as well as two Canadian mining companies and three mining companies in China.The method can provide references and technical support for the research and design of metal mine backfill both domestically and internationally.
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