Study Of Rheological Characters And Technologies Of Cream-body Fill

The rheological characters and pumping technologies of mine cream-body fill are mainly studied in the dissertation.In the long-term scientific research work, we realize that the test and study of the rheological characters of high concentration and higher concentration slurry have many very practical meaning in the aspects of deeply comprehending the motion character and variety character of high concentration slurry, guiding filling engineering system design and industrial production, regulating the proportioning of filling material, determining pipe-transport parameters, reinforcing the dynamic management of filling system.Filling material is non-Newton body with high viscidity, the theoretic and experimental study of the rheological characters of filling material are performed in the dissertation. The rheological model of complete caudal sand cream-body filling is H-B type. The rheological character of newly mixed concrete slurry and concrete mortar and the rheological character of newly mixed concrete are discussed respectively, but the rheological character of complete caudal sand filling slurry is emphatically discussed. The following two facts are proved adequately from the measure result of the character of complete caudal sand filling cream-body by using many methods.Firstly, although there are some differences exist in the measure result by using different methods, even the differences are very great, but they all can proved that complete caudal sand filling materials have fairly great yield stress.Secondly, it is proved by the rheological curve plotted according to the measure result that while the concentration of complete caudal cream-body is low, the shear stress of pipe wall increase with the increase of shear transformation ratio as cure law, while the concentration of complete caudal cream-body is high and fine stones areadded, the shear stress of pipe wall increase with the increase of shear transformation ratio as line law, and the rate of grade of cure will decrease with the increase of shear transformation ratio.Although complete caudal sand cream-body of Jinchuan has thixotropy, it is not obvious.The pumpability of cream-body filling material is an integrated index of the pumping of cream-body filling material. The study of cream-body filling technology has achieved success in Jinchuan Corporation.