工程科学学报，第40卷，第10期：1168-1176,2018年10月 Chinese Journal of Engineering,Vol.40,No.10:1168-1176,October 2018 DOI:10.13374/j.issn2095-9389.2018.10.003;http://journals.ustb.edu.cn 基于膏体稳定系数的级配表征及屈服应力预测 程海勇12)，吴顺川12)四，吴爱祥)，程纬华) 1)昆明理工大学国土资源工程学院，昆明6500932)金属矿山高效开采与安全教有部重点实验室，北京100083 区通信作者：E-mail:wushunchuan@163.com 摘要由于不同矿山充填材料性质千差万别，屈服应力影响因素很难统一分析.通过多个矿山尾砂试样，依次开展了级配 表征及影响实验、相似密度流变实验以及基于体积分数和灰砂比的双因素流变实验，并结合细观图像分析技术，实现了屈服 应力演化机理的研究.研究表明：膏体稳定系数是级配的有效表征方式，能够表现散体和流体综合特征：屈服应力随膏体稳定 系数呈幂指数增长，随浓度呈指数型增长，随密度呈负指数增长，由此构建的全尾砂膏体屈服应力预测模型误差在10%以内： 细观图像分析认为屈服应力主要受级配结构和絮网结构支配，级配结构构成了料浆可塑性和稳定性的基础，絮网结构将自由 水转变为半稳定形态的吸附水，引起屈服应力宏观演化。 关键词膏体充填；屈服应力：流变；级配：稳定系数 分类号TD853 Grading characterization and yield stress prediction based on paste stability coefficient CHENG Hai-yong2),WU Shun-chuan'),WU Ai-xiang?,CHENG Wei-hua 1)Faculty of Land Resources Engineering,Kunming University of Science and Technology,Kunming 650093,China 2)Key Laboratory of Ministry of Education of China for Efficient Mining and Safety of Metal Mines,Beijing 100083,China Corresponding author,E-mail:wushunchuan@163.com ABSTRACT Paste backfilling has become an important support technology in green mining construction.The flowability and rheology performance of paste determine whether the slurry can be transported normally.As such,the evaluation of flowability and rheology of paste are important factors in the reliability of paste transportation.Because paste has the three characteristics of fluidity,stability and plasticity,traditional two-phase flow theory cannot effectively analyze its plug flow.However,it is an effective method for analyzing and evaluating the fluidity of the paste based on rheology theory,and the yield stress is an important parameter for evaluating the rheological characteristics of paste.Due to the different properties of the materials in different mines,it is difficult to analyze the factors that influ- ence yield stress.Several experiments have been conducted on a variety of tailings from different mines,including a gradation charac- terization and influence experiment,a rheology experiment on materials of similar densities,and double-factor rheological experiments based on the concentration and sand ratio.Combined with mesoscopic structure analysis technology,the evolution mechanism of yield stress was studied.The results indicate that the stability coefficient of paste can effectively reflect the gradation,and can also reflect the comprehensive characteristics of the granule and fluid.The yield stress increases significantly with the paste stability coefficient and in- creases exponentially with the concentration.At the same time,yield stress is characterized by negative exponential growth with densi- ty.The error range of this yield stress prediction model for unclassified tailings paste is within 10%.The mesoscopic structure analysis shows that yield stress is mainly controlled by gradation and flocculent structure.The gradation constitutes the foundation for the plastic- ity and stability of the slurry.The flocculent structure transforms free water into the semi-stable form of adsorptive water,which causes the macro-evolution of the yield stress. KEY WORDS paste backfill;yield stress;rheology;gradation;stability coefficient 收稿日期：2017-11-30 基金项目：国家自然科学基金资助项目(51574013)：金属矿山高效开采与安全教有部重点实验室开放基金资助项目(ust山omslab201801)工程科学学报,第 40 卷,第 10 期:1168鄄鄄1176,2018 年 10 月 Chinese Journal of Engineering, Vol. 40, No. 10: 1168鄄鄄1176, October 2018 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 10. 003; http: / / journals. ustb. edu. cn 基于膏体稳定系数的级配表征及屈服应力预测 程海勇1,2) , 吴顺川1,2) 苣 , 吴爱祥2) , 程纬华1) 1)昆明理工大学国土资源工程学院, 昆明 650093 2) 金属矿山高效开采与安全教育部重点实验室, 北京 100083 苣通信作者:E鄄mail: wushunchuan@ 163. com 摘 要 由于不同矿山充填材料性质千差万别,屈服应力影响因素很难统一分析. 通过多个矿山尾砂试样,依次开展了级配 表征及影响实验、相似密度流变实验以及基于体积分数和灰砂比的双因素流变实验,并结合细观图像分析技术,实现了屈服 应力演化机理的研究. 研究表明:膏体稳定系数是级配的有效表征方式,能够表现散体和流体综合特征;屈服应力随膏体稳定 系数呈幂指数增长,随浓度呈指数型增长,随密度呈负指数增长,由此构建的全尾砂膏体屈服应力预测模型误差在 10% 以内; 细观图像分析认为屈服应力主要受级配结构和絮网结构支配,级配结构构成了料浆可塑性和稳定性的基础,絮网结构将自由 水转变为半稳定形态的吸附水,引起屈服应力宏观演化. 关键词 膏体充填; 屈服应力; 流变; 级配; 稳定系数 分类号 TD853 收稿日期: 2017鄄鄄11鄄鄄30 基金项目: 国家自然科学基金资助项目(51574013);金属矿山高效开采与安全教育部重点实验室开放基金资助项目(ustbmslab201801) Grading characterization and yield stress prediction based on paste stability coefficient CHENG Hai鄄yong 1,2) , WU Shun鄄chuan 1,2) 苣 , WU Ai鄄xiang 2) , CHENG Wei鄄hua 1) 1) Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China 2) Key Laboratory of Ministry of Education of China for Efficient Mining and Safety of Metal Mines, Beijing 100083, China 苣Corresponding author, E鄄mail: wushunchuan@ 163. com ABSTRACT Paste backfilling has become an important support technology in green mining construction. The flowability and rheology performance of paste determine whether the slurry can be transported normally. As such, the evaluation of flowability and rheology of paste are important factors in the reliability of paste transportation. Because paste has the three characteristics of fluidity, stability and plasticity, traditional two鄄phase flow theory cannot effectively analyze its plug flow. However, it is an effective method for analyzing and evaluating the fluidity of the paste based on rheology theory, and the yield stress is an important parameter for evaluating the rheological characteristics of paste. Due to the different properties of the materials in different mines, it is difficult to analyze the factors that influ鄄 ence yield stress. Several experiments have been conducted on a variety of tailings from different mines, including a gradation charac鄄 terization and influence experiment, a rheology experiment on materials of similar densities, and double鄄factor rheological experiments based on the concentration and sand ratio. Combined with mesoscopic structure analysis technology, the evolution mechanism of yield stress was studied. The results indicate that the stability coefficient of paste can effectively reflect the gradation, and can also reflect the comprehensive characteristics of the granule and fluid. The yield stress increases significantly with the paste stability coefficient and in鄄 creases exponentially with the concentration. At the same time, yield stress is characterized by negative exponential growth with densi鄄 ty. The error range of this yield stress prediction model for unclassified tailings paste is within 10% . The mesoscopic structure analysis shows that yield stress is mainly controlled by gradation and flocculent structure. The gradation constitutes the foundation for the plastic鄄 ity and stability of the slurry. The flocculent structure transforms free water into the semi鄄stable form of adsorptive water, which causes the macro鄄evolution of the yield stress. KEY WORDS paste backfill; yield stress; rheology; gradation; stability coefficient