Strength sensitivity and failure mechanism of full tailings cemented backfills
Strength sensitivity and failure mechanism of full tailings cemented backfills
复制标题
DOI：
--
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Fu Jian-xi
中科院分区：
文献类型：
--
作者：
Fu Jian-xi
以大冶铁矿尾矿为原料，水泥为胶结材料，制备了全尾砂胶结充填体，研究了充填体强度与浆液浓度、砂灰质量比、养护时间的关系，以及充填体强度对这些影响因素的敏感性，采用单因素五水平试验设计，回填土的强度与泥浆浓度和养护时间呈指数函数关系，充填体强度对养护龄期的敏感性最高，对砂灰质量比的敏感性最低;充填体的破坏经历了微裂纹闭合阶段、线弹性阶段、微裂纹扩展阶段和裂纹贯通阶段。
Full tailings cemented backfills were produced by taking Daye iron ore tailings as a raw material and cement as a cementing material.The relations of the backfills' strength with slurry concentration,sand-to-lime mass ratio and curing period,together with the sensitivity of the backfills' strength to these influencing factors,were studied by using single-factor five-level experiment design.The strength of the backfills follows an exponential function with slurry concentration and curing period,but a linear function with sand-to-lime mass ratio.Moreover,the sensitivity of the backfills' strength to curing period is the highest,but is the weakest to sand-to-lime mass ratio.Compressive failure test results show that destruction of the backfills goes through four stages,including micro-crack closure stage,linear elastic stage,micro-crack propagation stage,and crack coalescence stage.