含硫与脱硫尾砂充填体力学特性试验研究  

Experimental Study on the Mechanical Properties of Sulfur-containing and Desulfurized Tailings Paste Backfill

作　　者：文瑶 孙伟[2] 张盛友 张攀科 丁凡煜 WEN Yao;SUN Wei;ZHANG Shengyou;ZHANG Panke;DING Fanyu(School of Public Safety and Emergency Management,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China)

机构地区：[1]昆明理工大学公共安全与应急管理学院,云南昆明650093 [2]昆明理工大学国土资源工程学院,云南昆明650093

出　　处：《黄金科学技术》2025年第1期101-113,共13页Gold Science and Technology

基　　金：国家自然科学基金项目“铜渣基充填材料协同矿化CO_(2)作用机制及强度响应规律研究”(编号:52474131);国家自然科学基金项目“自然崩落开采中井下泥石流体流变行为与下泄穿流通道时空演化机制”(编号:42467022);云南省重大科技项目“关键金属矿产资源集中区深部绿色勘查与安全开采”(编号:202202AG050014);云南省基础研究计划“尾砂—冶炼渣复合充填体重金属离子溶出与靶向固化机制”(编号:202101BE070001-038);“矿井抽水蓄能储库水—岩耦合作用下岩体细观损破机理研究”(编号:202201AT070146)联合资助。

摘　　要：为深入探究含硫和脱硫尾砂充填体的力学特性,以某矿山含硫和脱硫尾砂作为充填骨料,水泥作为胶凝材料制作充填体试块,通过单轴压缩及巴西劈裂试验对含硫和脱硫充填体的测试结果进行分析,探讨不同灰砂比、质量浓度和养护龄期对2种充填体强度的影响规律,并通过拟合试验数据建立两两之间的定量关系,最后对其敏感程度进行研究。试验结果表明:(1)脱硫尾砂充填体强度始终大于含硫尾砂充填体强度,其中,脱硫尾砂的单轴抗压强度较含硫尾砂的提升幅度为2.02%~14.12%,抗拉强度的提升幅度为7.64%~58.45%;(2)当养护龄期为28 d、灰砂比为1∶8时,含硫尾砂的单轴抗压强度随质量浓度的增加并无明显变化,而脱硫尾砂充填体强度具有显著上升趋势;(3)当灰砂比为1∶4时,随着料浆质量浓度的增加,养护60 d的含硫和脱硫充填体强度增幅小于养护28 d的充填体强度增幅;当灰砂比降低至1∶8时,养护60 d的含硫和脱硫充填体强度增幅大于养护28 d的充填体强度增幅。研究表明,在充填体制备过程中,通过减少含硫尾砂中的硫化物含量,不仅提高了充填体的化学稳定性,而且增强了充填体的力学性能。The sulfide minerals present in the tailings of metal mines substantially influence the strength of backfill materials.This study aims to comprehensively investigate the mechanical properties of backfill composed of sulfur-containing and desulfurized tailings.For this purpose,sulfur-containing tailings sourced from a mine and desulfurized tailings processed through industrial trials were utilized as the aggregate in the backfill.Cement served as the binding agent in the preparation of backfill specimens.To evaluate the mechanical performance,uniaxial compression and Brazilian splitting tests were conducted,facilitating a comparative analysis of the desulfurized and sulfur-containing backfill specimens.The research examines the impact of varying cement-sand ratios,solid content concentrations,and curing age on the compressive strength of two types of backfill materials.Furthermore,quantitative relationships among these variables were derived by fitting the experimental data,and the sensitivity of each factor was assessed.The findings reveal that:(1)The compressive strength of desulfurized tailings backfill consistently exceeds that of sulfur-containing tailings backfill.The uniaxial compressive strength of desulfurized tailings exhibits an average increase ranging from 2.02%to 14.12%compared to sulfur-containing tailings,while the tensile strength demonstrates an enhan-cement between 7.64%and 58.45%.(2)At a curing age of 28 days and a cement-sand ratio of 1∶8,the uniaxial compressive strength of sulfur-containing tailings remains relatively unchanged with increasing mass concentration.In contrast,the strength of desulfurized tailings backfill displays a distinct upward trend.(3)At a cement-sand ratio of 1∶4,the compressive strength of both sulfur-containing and desulfurized backfill exhibits an increase with higher slurry concentrations after a 60-day curing age;however,this increase is less pronounced compared to the 28-day curing age.Conversely,when the cement-sand ratio is decreased to 1∶8,the strength en

关 键 词：含硫尾砂 脱硫尾砂 单轴抗压强度 巴西劈裂试验 因素敏感度分析 

分 类 号：TD853[矿业工程—金属矿开采]