| In this paper, based on granular dynamics and stratified rock mechanics, author studied the destructive mechanism and law of thin bedrock stratified roof on shallow coal seam, and attained conclusions as follow: 1) Overlying strata gradient laminated plates model was established. 2) The mechanics of first weighting was analyzed. During first weighting, author put forward three courses .First, key stratum was broken, which showed first weighting begin; second, the layers on the key stratum broken down, which formed first impact load; Third, granular-mass loading stratum descended after a while , which brought second impact load, the interval among the three courses was short. 3) Model of weight-bearing block was established about the overburden strata after the periodic weighting, and author illustrated the mechanics of periodic weighting . 4) Author analyzed the movement law of granular-mass load stratum, and explained the mechanics of dynamic load on the broken of stratified roof. |
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