Research And Application Of Backfill Mining By Setting Pillars With Super High-Water Material

Under for the current "three times" Coal mining is imminent, the coal situation and very non-serious, how safe and efficient mining of coal resources, to achieve the protected object protection requirements, but also very good cost control have risen to economic relations coal enterprises to survive height. High water material coordinated backfill mining technology, not only can effectively control surface movement and deformation, but also greatly reduce the cost of filling, the current situation is "three times" an effective way of mining.Based on the basic nature of the material and high water filling method, combined with coordinated exploitation of the technical characteristics of high water material coordinated backfill mining methods were studied, for justice can CG101 Face Coal Mining filling material remain high water coordinated filling mining technology, through theoretical analysis and engineering practice and other means of high water filling material coordinated strata movement of mining and mining to reduce subsidence effects of a preliminary analysis through this study reached the following conclusions:(1) High water filling process including slurry preparation, delivery and face mixture of three parts. Ultra-high water filling process simple operation, easy to grasp, initial investment is less, can choose according to actual circumstances, flexible filling station position.(2) The high water material "mining- filling- leave" part of filling mining method, namely through the reserve a certain width of coal pillar, and after the mining face goaf section for filling mining method to control the deformation of surface movement. Reduce the quantity of roadway, improve production efficiency; To improve the utilization rate of resources, reduce the full mining full filling mining cost.(3) The traditional method of caving mining caving zone, fractured zone, namely bending subsidence zone. "Mining- filling- leave" part of filling mining, formed in the caving zone and the "three zones", namely the caving zone, fractured zone, bending subsidence zone; In filling blocks, when the filling rate is high, directly on coal seam roof is given priority to with delamination of sinking, immediate roof breakage; Filling rate is low, the upper filling body false roof and immediate roof breakage is at an unfilled space occupied, passive pressure filling body gradually play a supporting role, restrictions continue to destroy the upper strata.(4) To calculate the righteous can CG1301 test of coal mine safety mining working face with coal pillar filling body coefficient K = 1.56, this design can ensure the long-term stability of coal pillar and filling body after mining.(5) The numerical simulation results show that the mining in coal wall around to form stress concentration, the partial filling mined-out area, can reduce the stress concentration degree, improve stability after the reserved coal pillar mining. Mined-out area is not filling and filling area filling rate is low, bending subsidence strata appear, formed in the goaf subsidence basin; Filling area filling rate is higher, the scope of mining subsidence basin formed and height are smaller.(6) Filling mining face in the process of working face in mine pressure appear more gently, and filling the support pressure is greater than the article caving mining face in stents, stent surface pressure filling by caving mining face roof subsidence and change. "Mining- filling- leave" filling mining can use joint support stable support overburden, keep the primary key stratum in the overburden don’t appear rupture phenomenon, so as to achieve the effect of surface subsidence control.