(1. 北京科技大學(xué) 土木與資源工程學(xué)院，北京 100083；
2. 北京科技大學(xué) 金屬礦山高效開采與安全教育部重點(diǎn)實(shí)驗(yàn)室，北京 100083)
摘 要: 含粗骨料的膏體充填料漿在管道輸送時(shí)存在粗顆粒沉降堵管和管壁磨損嚴(yán)重的問題，但常規(guī)的管道輸送實(shí)驗(yàn)方法難以獲得粗顆粒在管道截面上徑向遷移的影響因素。以顆粒在黏塑性流體中的運(yùn)動(dòng)規(guī)律為基礎(chǔ)，結(jié)合膏體充填工藝的實(shí)際情況，采用數(shù)值模擬研究膏體料漿流變參數(shù)對(duì)粗顆粒遷移的影響。針對(duì)實(shí)際生產(chǎn)中管道直徑與粗骨料顆粒直徑之比λ相對(duì)較小，在顆粒-流體耦合分析時(shí)可將粗骨料顆粒視為宏觀顆粒，采用宏觀顆粒模型(MPM)進(jìn)行數(shù)值模擬。以Bingham流體的無量綱數(shù)，即塑性黏度雷諾數(shù)Rep、賓漢姆數(shù)Bi為定量評(píng)價(jià)指標(biāo)，分析充填料漿的屈服應(yīng)力、塑性黏度對(duì)粗骨料顆粒遷移的影響。結(jié)果表明，對(duì)于剪切流動(dòng)區(qū)域內(nèi)的粗骨料顆粒，其徑向遷移量與屈服應(yīng)力值和賓漢姆數(shù)Bi呈反比、與塑性黏度值呈正比，在一定的黏性效應(yīng)下與塑性黏度雷諾數(shù)Rep呈正比。
關(guān)鍵字: 膏體充填料漿；宏觀顆粒模型；影響因素；流變參數(shù)；無量綱數(shù)
（1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing 100083, China）
Abstract:The paste backfill slurry with coarse aggregate had the problems of coarse particles settlement and wall wear serious in pipeline transportation. It was difficult to analyze the influencing factors of coarse particles’ radial migration in the pipeline sections by conventional pipe flow experiments. In this work, based on the law of movement of particles in viscoplastic fluid and the actual situation of paste backfill technology, the influence of rheological parameters of paste slurry on coarse particles’ law of migration was studied by numerical simulation. For actual production, the ratio λ of pipe diameter to coarse aggregate particles diameter was relatively small, coarse aggregate particles could be regarded as macroscopic particles in particle-fluid coupling analysis, and the Macroscopic Particle Model (MPM) was used for numerical simulation. Taking the dimensionless numbers of Bingham fluid, i.e., plastic viscosity Reynolds number Rep and Bingham number Bi as quantitative evaluation indexes, the influence of yield stress and plastic viscosity of backfill slurry on coarse aggregate particles’ law of migration was analyzed. The results show that the radial migration of coarse aggregate particles in the shear flow region is inversely proportional to the yield stress value and Bingham number Bi, is directly proportional to the plastic viscosity value, and is directly proportional to the plastic viscosity Reynolds number Rep under a certain viscous effect.
Key words: paste backfill slurry; macroscopic particle model; influencing factors; rheological parameter; dimensionless numbers
