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      • STUDIES ON GRAVITY BLIND BACKFILLING FOR GROUND STABILIZATION ABOVE ABANDONED UNDERGROUND MINES

        Samir Kumar Pal,Subir Kumar Mukhopadhyay,Susmita Panda,Anup Kumar Tripathi 한국암반공학회 2010 한국암반공학회 학술대회 및 세미나 자료집 Vol.2010 No.10

        Blind hydraulic backfilling is a commonly adopted technique for subsidence control of the strata over unapproachable water-logged underground excavations, particularly in coal mining. There are three variants in blind backfilling, viz., the hydro-pneumatic, the pumped-slurry, and the simple gravity backfilling. This paper mainly describes investigations carried out on gravity blind backfilling technique on the experimental model as well as in the field, since it is the simplest and the easiest among the three methods which can be used for stabilization of ground over old abandoned water-logged mines. On examination of the filling process, it was revealed that the basic process of filling occurs by sand transportation along one or more meandering channels. In the study, the relative influence of sand, water and air flow rates on the area of filling from a single inlet point and the hydraulic pressure loss per unit length were studied in detail. Inlet pressure variation with time, known as pressure signature, have been used to study the changes in the physical filling phenomena inside meandering channels and pre-jamming phase of filling. This procedure has the potential to maximize the sand throughput from a single inlet pipe at minimum possible time. Of all the above mentioned methods, simple gravity backfilling was found to be economic as well as efficient, especially when the flow rates are high. Some empirical relationships developed using multiple regression technique for use by the practicing engineers for the process control while employing this process are also discussed in the paper.

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