外文翻譯---采礦對(duì)煤層底板斷層活化影響的數(shù)值模擬-文庫(kù)吧
2025-01-02 23:37 本頁(yè)面
【正文】 m deep under the coal floor is lithology of the floor is Berea sandstone and the elastic modulus E=104MPa,the Poisson’s ratioμ=,the cohesion C=,the internal friction angleφ=35176。 and the densityγ= kN/ calculation model of the workface on the upper part of the fault(ModelⅡ)is the same as that of ModelⅠexcept that the abutment pressure ahead of the workface is on the upper part of the fault.3 Numerical Simulation Results and AnalysisFor both models,the isoline graphs of horizontal, vertical and shear stresses as well as the horizontal and vertical displacements of modelsⅠandⅡhave been calculated and are plotted respectively as –3. Distribution characteristics of horizontal stressesInfluenced by mining of the coal floor rock, there are horizontal stress releasing areas and rising areas at the upper part and at the footwall of the fault. The distribution of horizontal stresses is influenced by the fault and it is obvious that the stress isolines are staggered by the fault face and the stress is concentrated on the rock seam around the two ends of the fault. In model I,stress is concentrated at the shallow part of the orebody at the footwall of the horizontal stress is –10 horizontal stress under the fault face is – lower part of minedout areas on the lower fault block releases pressure,and may even turn to tension stress of about in the deeper part,the horizontal stress turns to pressive stress and the value increases gradually. In modelⅡ,the stress is concentrated at the lower part of the orebody on the lower fault block and the horizontal stress bees – horizontal stress under the fault face is – lower part of the minedout areas at the fault footwall releases pressure。the horizontal stress is MPa. Distributional characteristics of vertical stressesThe distributions of vertical stresses are also influenced by stress isolines are staggered by the fault stress is focused on the rock seam round the two ends of the fault. In model I,the stress is concentrated at the lower part of the orebody on the lower fault the depth increases,the extent of the stress concentration in the rock under the coal bed vertical stresses of the rock under the coal bed step down from MPa to extent of the release at the upper part of minedout areas reduces gradually and the vertical stresses increase from MPa to vertical stresses at the footwall of the fault face increase from MPa to MPa. In modelⅡ,the stress is concentrated at the lower part of the orebody on the lower fault block. When the depth increased,the concentration
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