尾砂胶结充填体固结后强度激发特性研究  

Study on Strength Excitation Characteristics of Cemented Tailings Backfill after Consolidation

作　　者：王志凯 吕文生[1] 杨鹏[1,2] 于跟波 

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]北京市信息服务工程重点实验室,北京100101 [3]北京矿冶研究总院,北京100070

出　　处：《金属矿山》2017年第9期30-34,共5页Metal Mine

基　　金："十二五"国家科技支撑计划项目(编号:2012BAB08B01);国家自然科学基金项目(编号:51641401)

摘　　要：以新城金矿分级尾砂和新城水泥为原材料,制作浓度为70%,灰砂比为1∶10的试块,对不同养护龄期的充填体试块进行侧限条件下压缩固结试验,研究了侧限高应力固结对不同龄期充填体单轴抗压强度的影响,以及不同固结应力对充填体强度的影响,分析了固结后不同强度激发期对充填体单轴抗压强度的影响规律。研究结果表明:侧限高应力(25.5 MPa)固结后,充填体强度有了显著增强,侧限高应力固结对充填体强度随固结后养护时间的增长具有显著的激发作用,14 d、28 d充填体固结后强度呈指数增长,而56 d充填体固结后强度呈对数增长,同时侧限固结对于充填体强度的激发作用还与固结过程中最大侧限固结应力有密切关系。With tailings from Xincheng Gold Mine and Xincheng cement as raw materials,blocks for tests with concentration of 70 different curing ages to investigate the influence of confining stress on the uniaxial compressive strength of backfill body at different ages and the influence of different consolidation stresses on the strength of the backfill body. The influence law of different strength and duration of consolidation on uniaxial compressive strength of backfill body was analyzed. The results showed that the strength of the backfill body is obviously increased after the lateral high stress（ 25. 5 MPa） consolidation,so the high stress consolidation of the confinement has a significant effect on the strength growth of backfill body with the increase of the curing time. The strength of 14 d and 28 d backfill body increases exponentially after consolidation. The strength of filling body increases logarithmically at 56 d. At the same time,the effect of lateral consolidation on the strength of the filling body is closely related to the maximum lateral consolidation stress during the consolidation process.

关 键 词：胶结充填体 高应力 压缩固结 强度激发 

分 类 号：TD853[矿业工程—金属矿开采]