Research on Reasonable Width of Coal Pillars in High Strength Mining Roadway in Wantugou Mine
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ORIGINAL PAPER
Research on Reasonable Width of Coal Pillars in High Strength Mining Roadway in Wantugou Mine Kai Yang . Panfeng Gou
Received: 19 September 2020 / Accepted: 14 October 2020 Ó Springer Nature Switzerland AG 2020
Abstract Reasonable coal pillar size is a necessary condition for high strength and safe mining of coal face with double roadway arrangement. On the basis of the lack of theory of coal pillar retention between alleys and taking coal pillars between alleys as engineering background, this paper analyzes the mechanical behavior of coal pillar bearing arranged in double roadways, calculates the width of plastic zone of coal pillar according to SMP criterion, and determines the minimum theoretical size of coal pillar between alleys with elastic core width of 0 m is 13.5 m. FLAC 3D software was used to simulate the coal pillars of 13.5 m, 17 m and 20 m, respectively, to obtain the distribution characteristics of surrounding rock stress and plastic zone during the primary and secondary disturbances of coal pillars between roadway. It can be concluded that with the increase of the width of the coal pillar, the peak stress in the coal pillar decreases, the plastic zone around the roadway shrinks and the bearing capacity of the coal pillar increases. It is found that the elastic core of 13.5 m coal pillar is 5 m and 9 m respectively, and the increase of coal pillar width leads to the broadening of elastic core. Considering the above coal seam are weak aquifer, have an old goaf water, and adjacent rocks of coal seam has obvious degradation under the influence of water features, adverse to the mining working face, K. Yang (&) P. Gou Henan Polytechnic University, Jiaozuo 454000, China e-mail: [email protected]
especially on floor stability, lastly, between the pillars of 20 m field test, to effectively control deformation of coal pillar, proves the rationality of the design coal pillar between roadway. Keywords Double roadways layout Coal pillar between roadways Mechanical behavior Stress evolution Plastic zone Elastic nucleus
1 Introduction Since the national supply-side reform, with the replacement of advanced production capacity and the withdrawal of backward production capacity, coal mining has gradually shifted to the core mining areas of Shanxi, Shaanxi and Mongolia (Zhang et al. 2019). According to the statistics of the National Bureau of Statistics, in 2019, the output of raw coal in Shanxi, Shaanxi and Mongolia reached 2.64 billion tons, accounting for 70.5% of the total output of the country. As a result, a number of large-scale modern mines emerged in these areas. In order to realize the rapid and high-strength mining of the coal mining face, and to meet the mining needs of transporting people, coal, materials and ventilation, the layout of two entrances, two circuits and multiple roadways has been popularized and applied in many mining areas in Inner Mongolia (Du and Meng 2009). However, the layout of mining roadways will produce
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