全尾砂胶结充填体的强度敏感性及破坏机制  

Strength sensitivity and failure mechanism of full tailings cemented backfills

作　　者：付建新[1,2] 杜翠凤[1,2] 宋卫东[1,2] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [2]北京科技大学土木与环境工程学院,北京100083

出　　处：《北京科技大学学报》2014年第9期1149-1157,共9页Journal of University of Science and Technology Beijing

基　　金：中央高校基本科研业务费专项基金资助项目(FRF-SD-12-003A);长江学者和创新团队发展计划资助项目(IRT0950)

摘　　要：以大冶铁矿全尾砂为原材料,采用水泥为胶结材料制作全尾砂胶结充填体,采用单因素五水平设计试验,研究了全尾砂胶结充填体强度与料浆中固相质量分数、灰砂配比及龄期之间的关系,并对敏感性进行了分析.胶结充填体强度随着料浆中固相质量分数的增加遵循指数函数增长,随灰砂配比的增加呈线性增长,随龄期增加遵循指数函数的增长,其中胶结充填体强度对龄期的敏感性最高,料浆中固相质量分数次之,灰砂配比最弱.胶结充填体抗压破坏试验结果显示,充填体的破坏经历了四个阶段,分别为微裂隙闭合阶段、线弹性阶段、微裂纹扩展阶段及裂纹贯通破坏阶段.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 experi-ment design. The strength of the backfills follows an exponential function with slurry concentration and curing period, but a linear func-tion 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.

关 键 词：尾砂 胶结充填体 强度 敏感性 破坏 定量分析 

分 类 号：TD353[矿业工程—矿井建设]