發(fā)布時間：2018-08-15 11:31

【摘要】：針對上覆高位硬厚巖層的結構特征和受力狀態(tài),建立了均布載荷和體積力共同作用的力學模型,得到了硬厚巖層破斷形式的力學判據(jù)。采用相似材料模擬試驗及離散元數(shù)值模擬,研究了高位主關鍵層下覆巖采動裂隙和支承應力的演化規(guī)律及其對瓦斯運移的影響,并采用工程實例驗證了研究結果。研究表明:高位主關鍵層條件下,覆巖采動裂隙發(fā)育、煤巖體支承應力分布、卸壓效果都發(fā)生了明顯變異,主關鍵層阻隔了向上發(fā)育或傳遞。主關鍵層下方形成中部梯形壓實區(qū)和兩側平行四邊形破裂區(qū),破斷裂隙呈類"馬鞍"形分布,其底部離層量分布按照"單谷"、"倒梯形"、"雙谷"形態(tài)演化;煤巖體支承應力集中程度較高,影響范圍較大,主關鍵層破斷運移后明顯下降。主關鍵層下方存在采空區(qū)卸壓裂隙發(fā)育區(qū),游離瓦斯可通過破斷裂隙運移至主關鍵層底部的負壓離層空間,主關鍵層運移時可能誘發(fā)地面鉆孔瓦斯動力現(xiàn)象。
[Abstract]:According to the structural characteristics and stress state of overlying high hard thick strata, a mechanical model of the interaction of uniform load and volume force is established, and the mechanical criterion of hard and thick strata breaking form is obtained. By using similar material simulation test and discrete element numerical simulation, the evolution law of mining fissure and supporting stress and its influence on gas migration under high main key strata are studied, and the research results are verified by an engineering example. The study shows that under the condition of high main key layer, the overburden mining fissure develops, the supporting stress distribution of coal and rock mass, and the effect of pressure relief all have obvious variation, and the main key layer blocks the upward development or transfer. The central trapezoid compaction zone and the bilateral parallelogram fracture zone are formed under the main key layer. The fracture is like saddle distribution, and the distribution of the bottom layer is in the form of "single valley", "inverted trapezoid" and "double valley". The supporting stress concentration of coal and rock mass is high and the influence range is large, and the main key layer is obviously decreased after breaking and migration. Under the main key layer, there is a pressure relief fissure development area in the goaf. Free gas can be transported to the negative pressure separation space at the bottom of the main critical layer by breaking the fracture, which may induce the gas dynamic phenomenon in the ground borehole when the main key layer moves.
【作者單位】： 山東科技大學礦山災害預防控制省部共建國家重點實驗室培育基地;山東科技大學資源與土木工程系;濟寧學院化學與化工系;
【基金】：國家自然科學基金項目(51374139) 山東省自然科學基金項目(ZR2013EEM018) 山東科技大學科研創(chuàng)新團隊支持計劃項目
【分類號】：TD32;TD712

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