Research on prevention and control technology of strong mine pressure during shallow-buried working face passing through coal pillar group
In view of the strong ground pressure,poor support stability,and obvious dynamic load during the shallow-buried working face passing through the remaining coal pillars in overlying goaf in western China,taking 22104 working face of Shangwan Coal Mine passing through the overlying concentrated coal pillars in the active mining area of the No.1-2 coal seam as the research background,theoretical analysis and numerical simulation were used to study the spatiotemporal relationship between the load transfer mechanism and the suspended length of hard roof of lower coal seam face when the remaining coal pillars in the goaf became unstable,by using interlayer weakening technology to regulate the suspended length of hard roof,the strong mine pressure could be controlled during working face passing through coal pillar group.The research results indicated that reducing the suspended length of interlayer hard roof by hydraulic fracturing could weaken the impact transmission of instable coal pillar load to the underlying working face.Using numerical simulation to study the influence of the difference in suspended roof length on the stress transfer law of the working face under the conditions of weakening and non-weakening of interlayer hard roof,it was found that the reduction of suspended roof length after weakening of interlayer hard rock layers could significantly alleviate the stress environment of the surrounding rock of the working face.The feasibility of the prevention and control technology was verified by combining the weakening effect of 22104 working face,which provided a theoretical basis for the research on the prevention and control technology of strong mine pressure passing through coal pillar group in shallow-buried working face.
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