發(fā)布時間：2018-03-24 00:21

  本文選題：原煤　切入點：破壞程度　出處：《安徽理工大學》2017年碩士論文

【摘要】：本論文對煤樣試件在單軸壓縮破壞下不同破壞階段的瓦斯吸附解吸規(guī)律進行了實驗研究,并結(jié)合數(shù)值模擬結(jié)果說明破壞過程孔隙-裂隙結(jié)構(gòu)的發(fā)展。實驗結(jié)果表明:1)煤樣在完整狀態(tài)的瓦斯吸附量最大,彈性點階段、屈服點階段、峰值點階段、破碎階段的瓦斯吸附量相差不大,但明顯低于完整狀態(tài)時的瓦斯吸附量;2)從煤樣完整狀態(tài)至破碎階段,煤樣的解吸初速的變化趨勢呈"U"字形,完整狀態(tài)、峰值點階段、破碎階段的瓦斯解吸初速度較大,彈性點階段、屈服點階段的解吸初速度較小;3)隨著瓦斯壓力的增大,煤的瓦斯吸附量增大,但瓦斯吸附量增量變化率逐漸減小;4)隨著瓦斯壓力的增大,煤樣達到吸附平衡所需時間隨之延長;5)煤樣破壞過程中的聲發(fā)射特征與應(yīng)力-應(yīng)變曲線特征相吻合,可以表征煤樣破壞過程煤體內(nèi)部孔隙-裂隙結(jié)構(gòu)的變化發(fā)育情況。
[Abstract]:In this paper, the law of gas adsorption and desorption of coal samples at different failure stages under uniaxial compression failure is studied experimentally. Combined with the numerical simulation results, the development of pore-fracture structure in the failure process is illustrated. The experimental results show that the gas adsorption capacity of the coal sample in the complete state is the largest, the elastic point stage, the yield point stage, the peak point stage, The amount of gas adsorbed in crushing stage is not different, but it is obviously lower than that in complete state.) from the complete state of coal sample to the stage of crushing, the change trend of initial velocity of desorption of coal sample is "U" shape, complete state and peak value stage. The initial velocity of gas desorption in breakage stage is larger than that in elastic point stage and yield point stage. (3) with the increase of gas pressure, the gas adsorption capacity of coal increases. With the increase of gas pressure, the time required for coal samples to reach adsorption equilibrium is prolonged. The acoustic emission characteristics of coal samples in the process of destruction are consistent with the stress-strain curves. It can be used to characterize the change and development of pore-fracture structure in coal body during coal sample failure.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD712

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