本文選題：采空區(qū) + 破碎煤體�。� 參考：《煤炭學(xué)報(bào)》2017年12期

【摘要】：利用自制的承壓破碎煤體滲流及自燃測(cè)試裝置,實(shí)驗(yàn)測(cè)試及分析了破碎煤體在應(yīng)力、應(yīng)力-溫度、應(yīng)力-水分不同條件下的碎脹系數(shù)的演變特征與機(jī)制。研究結(jié)果表明:(1)煤樣隨著應(yīng)力增加,碎脹系數(shù)變化具有明顯的階段性,且隨應(yīng)力變化服從負(fù)指數(shù)變化規(guī)律;(2)在相同的軸壓下,碎脹系數(shù)隨溫度升高而增加,熱膨脹效應(yīng)明顯,說明采空區(qū)煤自燃的熱效應(yīng)將造成破碎煤體的碎脹系數(shù)增大,堆積更為松散;(3)當(dāng)破碎煤體外在水分含量增加,在相同的軸壓情況下,碎脹系數(shù)隨外在水分增加而增加。說明隨著采空區(qū)破碎煤體外在水分的增加,破碎煤體的碎脹系數(shù)將增大;(4)破碎煤體在應(yīng)力、熱膨脹及濕膨脹作用下,堆積體內(nèi)部顆粒發(fā)生相對(duì)移動(dòng)、二次破碎、顆粒自組織再堆積,致使應(yīng)力-應(yīng)變曲線發(fā)生變化,進(jìn)而影響其碎脹系數(shù)。
[Abstract]:The evolution characteristics and mechanism of dilatation coefficient of broken coal under different conditions such as stress, stress-temperature and stress-moisture were tested and analyzed by using the self-made self-made apparatus for seepage and spontaneous combustion of broken coal body under different conditions of stress, stress-temperature and stress-moisture. The results show that with the increase of stress, the dilatation coefficient of coal sample has obvious phase change, and the variation rule of the coefficient of dilatation is from negative exponent to that of stress. (2) under the same axial pressure, the coefficient of dilatation increases with the increase of temperature, and the thermal expansion effect is obvious. The results show that the thermal effect of spontaneous combustion in goaf will cause the breaking expansion coefficient of broken coal to increase, and the accumulation is looser. When the external moisture content of broken coal body increases, under the same axial pressure, the breaking expansion coefficient increases with the increase of external water content. It shows that with the increase of water content outside the broken coal body in goaf, the breaking expansion coefficient of the broken coal body will increase by 4) under the action of stress, thermal expansion and wet expansion, the internal particles of the crushed coal body will move relatively and the secondary crushing will take place. Self-organization and reaccumulation of particles lead to the change of stress-strain curve and then influence the coefficient of dilatation.
【作者單位】： 河南理工大學(xué)安全科學(xué)與工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51404090,51774114,51574111)
【分類號(hào)】：TD752.2

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