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英文原文： Analytical model and application of stress distribution on mining coal floor Abstract：Given the analysis of underground pressure，a stress calculation model of cola floor stress has been established based on a theory of elasticity．The model presents the law of stress distribution on the relatively fixed position of the mining coal floor：the extent of stress variation in a fixed floor position decreases gradually along with depth．The decreasing rate of the vertical stress is clearly larger than that of the horizontal stress at a specific depth．The direction of the maximum principal stress changes gradually from a vertical direction to a horizontal direction with the advance of the working face．The deformation and permeability of the rock mass of the coal floor are obtained by contrasting the difference of the principal stress established from theoretical calculations with curves of stress-strain and permeability-strain from tests．Which is an important mechanical basis for preventing water inrush from confined aquifers． Key words：model；coal floor；stress distribution；analysis 1 Introduction With the development of coal seam mining，The stress field of rock strata of coal seam floors will change and continue to be redistributed because of the effect of mining．The results will　bring on floor deformation，displacement and possible destruction to attain a new balance[1]．A study of the law of stress distribution of floors has important，practical implications in understanding deformation and destructive characteristics and predicting water inrush from floors and for designing suitable locations for tunnels and selecting maintenance methods when depth increased．At present，the study of the law of stress distribution of floors mostly proceeds from a number of calculations based on finite element analyses and similar material tests[2-6]．In this paper， the study of stress distribution of floors in relatively fixed positions is discussed analytically with a theory of elastic