摘要
为研究细菌来源、细菌溶液体积分数以及黏结剂质量分数对充填材料性能的影响,采用正交设计实验方法,开展充填材料制备实验,考察实验过程中抗压强度、持水量、体积收缩率等参数的变化,分析细菌来源、细菌溶液体积分数以及黏结剂质量分数对充填材料性能的影响规律;对选定的黏结剂进行细菌接种实验,研究黏结剂对细菌群落的影响。研究结果表明:黏结剂对细菌群落无明显影响;各因素对充填材料性能的影响程度按由大到小顺序排列依次为黏结剂质量分数、细菌溶液体积分数和细菌来源;当细菌溶液体积分数为100%、黏结剂质量分数为30%、细菌来源为A时,充填材料的体积收缩率、塌落度以及抗压强度分别为4.09%,18.94 cm以及5.19 MPa,在此条件下,充填材料性能最佳;添加细菌溶液可使Fe2+快速转化为Fe3+,Fe3+浓度增大,促进Fe3+水解形成沉淀物质,减少充填材料内部裂纹数量,提高充填材料性能。
In order to study the effect of bacterial source,volume fraction of bacterial solution and mass fraction of binder on properties of backfilling materials,the preparation experiment of backfilling materials was carried out by using the orthogonal design experimental method.Parameters including compressive strength,water-holding capacity and shrinkage ratio were investigated.The influence of bacterial source,volume fraction of bacterial solution and mass fraction of binder on properties of backfilling materials was analyzed.The bacterial inoculation experiment adding binder was conducted.The results show that binder has no considerable effect on bacterial community.According to the orthogonal experiment,the factors affecting properties of backfilling materials in the descending order are as follows:mass fraction of binder,volume fraction of bacterial solution and bacterial source.The properties of backfilling materials are the best when 100%bacterial solution,30%binder and bacteria A are applied.The compressive strength reaches 5.19 MPa,and slump and shrinkage ratio reach 18.94 cm and 4.09%respectively,which enhances the performance of backfilling materials.The addition of bacterial solution can accelerate the conversion of Fe2+to Fe3+,promote Fe3+concentration and Fe3+hydrolysis to form precipitates,reducing cracks inside backfilling materials,and enhance the performance of backfilling materials.
作者
陈威
尹升华
陈勋
王雷鸣
宋庆
CHEN Wei;YIN Shenghua;CHEN Xun;WANG Leiming;SONG Qing(Key Laboratory of Ministry of Education for High-Efficient Mining and Safety of Metal,University of Science and Technology Beijing,Beijing 100083,China;School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2023年第3期797-806,共10页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(52034001)
国家科技部重点领域创新团队资助项目(2018RA4003)
高等学校学科创新引智计划资助项目(B20041)。
关键词
尾砂
细菌溶液
充填
抗压强度
tailings
bacterial solution
backfilling
compressive strength
