基于Fuller级配理论的膏体管道输送减阻技术研究

针对膏体充填的物料配比问题，通过分析膏体内部结构的物质组成，提出物料密实度越大膏体流动性越好；采用Fuller理论对某铜矿充填物料的级配特性进行分析，考察了级配指数n随物料配比的变化规律；开展膏体塌落度、流变特性实验，采用白金汉公式对膏体管流阻力进行理论计算。结果表明：该铜矿膏体中全尾砂∶水淬渣=3∶2时，物料密实度较大，最利于其管道输送；质量分数72 %，管径150 mm，流量60 m³/h的工况条件下，水淬渣掺量40%时的管流阻力为2.46 MPa/km，与全尾砂膏体管流阻力3.65 MPa/km相比，减阻率达32.6%，说明级配优化后膏体管流阻力明显降低。

Study on Pipeline Transport Drag Reduction Technology of CPB based on the Fuller Grading Theory

Aimed at the question of material ratio of cement paste backfilling (CPB),through analyzing the material composition of the internal structure in CPB,it was proposed that the larger aggregate packing degree is,the better paste flow;The Fuller theory was used to analyze the filling material gradation characteristics of a certain copper mine,and explore the rule of grading index n changing with material ratio. The slump test and rheological experiments of CPB were carried out, and Buckingham formula was adopted to calculate the pipe flow resistance. The results showed that the aggregate packing degree is larger and is most favorable for pipeline transport,when the material ratio with unclassified tailings of water quenching slag as 3of 2. The pipe flow resistance was 2. 46 MPa/km under the conditions of mass fraction 72%,pipe diameter of 150 mm,flow rate of 60m3/h and water quenching slag content 40%. By contrast with the pipe flow resistance of unclassified tailings 3. 65 MPa/km,its drag reduction efficiency reached 32. 6% in pipeline transport. That illustrated that the paste pipe flow resistance is reduced obviously after gradation optimization.