| Super high water material open filling mining has the advantages of simple process, low cost of filling and actual application and convenient operation. It is a green mining method and it can be an effective solution to complicated coal mining problems under three circumstances. However, due to this material consolidation content high water, if the bearing is too large, it will cause structural damage and bleeding and greatly reduce the filling space. Therefore, in order to ensure the filling quality, it is necessary to study the bearing characteristics, to select and optimize the ratio of the mining enterprises scientifically, and to provide useful advice and suggestions for the efficient exploitation of coal resources.In this paper, base on the actual situation of Handan Mining Group Taoyi mine open filling mining experience and the field, we use comprehensive utilization of test simulation research, theoretical analysis and calculation, field demonstration research methods, focusing on the application of filling body bearing, bearing load characteristic, bearing strength demand value analysis in the open filling mining. This paper mainly draws the following conclusions:(1)According to "filled then solidification then filling" step by step in the development process that ultra solidifying backfill body of high water material in goaf are not bearing, bearing when filling body’s three surface displacement is limited and bearing when the filling body’s lateral displacement limited. According to the simulation test for the bearing state that 94% and 95% of the water volume ratio consolidation in each loading condition as well as the bearing strength is respectively 0 MPa, 0 MPa; 0.65 MPa, 0.56 MPa; 7.3 MPa to 5.5 MPa;(2)According to characteristics of the bearing capacity of the test in the determination of bleeding characteristics and bearing characteristics, it is concluded that the super solidifying backfill body of high water material the bleeding amount is the amount of compression. But in engineering practice, there may be a filling body internal voids, bleeding with the consolidation of structural damage, therefore consolidation, the actual amount of compression will be greater than bleeding;(3)According to the load bearing properties that bearing 94% and 95% water volume ratio of super high water material lateral confinement strength and uniaxial load for the multiple relationships between strength respectively: y = 0.001x3- 0.044x2 + 0.60 x + 0.77 and y = 0.001x3- 0.05x2 + 0.73 x + 0.44(x for the same water volume, the same curing conditions consolidation uniaxial bearing strength value);(4)From the point of view of energy, the calculation method of the strength requirement of the super high water material consolidation body is put forward:PΔ + C1P2- C2 = 0(C1 > 0,C2 > 0). Open filling established from the point of view of energy. According to the actual situation of the Tao a mine 6 work assignment, and draws a conclusion that the goaf filling consolidation strength should not be less than 6.3 MPa and that the mined out area should choose 94% water volume ratio of ultra high water material filling mining.(5) the engineering application monitoring results show that the maximum bearing strength of the filling body in the goaf is not more than 6 MPa, and the strength requirement of the calculated results is 6.3 MPa. At the same time, surface monitoring results show that using the ratio of material for filling mining, can meet the surface settlement, filling materials proportioning choosing reasonable, accurate calculation of air filling consolidation strength demand. |
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