Research On The Caving Mining Underground Pressure Appeared And Control In KM Deep Tangkou Mine

With the continued mining of coal, the shallow and central coal resources are less and less, because the intensity increased and the mechanization of mining level, production mine and that under accelerate the pace of development to deep, Deep mining is the actual problem to be faced of the most major mining country in the world, many of our coal mines has entered a deep mining at present. High pressure, large deformation, difficult to support are important issue of deep mining, which is a major problem of the rock mechanics.In this paper, the caving mining underground pressure appeared and control are studied,aimed at the geological conditions of 1304 working face in Tang Kou coal mine, by the methods of field observation, discrete element numerical simulation, the theoretical analysis and others.According to the measured research on the underground pressure appeared of 1304 working face, rules that underground pressure appeared, lead abutment pressure, side abutment pressure, posterior abutment pressure and the extraction roadway mine pressure regularly of full-mechanized caving mining face in Tang Kou coal mine are concluded.By the method of discrete element numerical simulation, studied the Tang Kou caving mining coal kilometers deep well with roof movement abutment pressure distribution, interaction between stents and surrounding rocks and the stability of surrounding rock roadway along gob. The results show that:with the different excavation distance, the abutment pressure distribution curve was basically same, the influence scope of abutment pressure was extended on effect of the collapse of the main roof during the working face advancing ahead, and compared to the condition that the main roof did not collapse, the peak of abutment pressure was decreased; when the support had a different support intensity, as the support intensity increasing, the convergence between roof and floor changed to gently, the convergence between roof and floor and support intensity was similar to a class of liner relation; Through the research on stress distribution rule of surrounding rock and coal roadway along gob and distribution of plastic zone under the condition of different pillar size, it is concluded that 5m was reasonable for the pillar of the roadway along gob area.Through methods such as field measurement, numerical simulation, the theoretical analysis, demand recorder distance of face control, roof structure and motion parameters, The stents rational support strength, forms and support parameters of the gob-side entry are studied, obtained deep well fully-mechanized coalface mine pressure control design and supporting design, roadway along gob of similar terrain conditions mine mining has certain reference value.