有效应力对石门揭煤突出影响分析和试验研究

doi:10.13722/j.cnki.jrme.2017.0280

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摘要石门揭煤突出是我国煤矿突出强度最大、破坏最为严重的动力灾害。考虑深部开采条件，引入有效应力，应用折叠突变模型推导得到临界有效应力与揭煤面面积间关系表达式，给出不同埋深最大揭煤面面积，分析临界有效应力与揭煤面面积关系规律。以阜新孙家湾煤矿埋深1 100 m突出煤层为研究对象，选用型煤试件，利用自主研制的三轴突出模拟仪进行石门揭煤突出模拟试验。期间对型煤试件施加轴压、围压和孔隙压，模拟突出煤层所处应力环境。改变突出弱面面积(30.19，34.21，38.48 cm2)模拟石门揭煤面面积对突出影响。结果表明：临界有效应力与揭煤面面积间呈递增关系，理论值与试验值增加趋势一致，验证临界有效应力公式有效性；临界有效应力、揭煤面面积是影响石门揭煤突出强度主要因素；突出区域煤粉分布具有波动特性，随临界有效应力和揭煤面面积增加，揭煤处附近突出能量增大，突出强度增加。所得结论对预防石门揭煤突出有重要参考意义。

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	唐巨鹏
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	路江伟

关键词 ：采矿工程：揭煤面面积, 煤与瓦斯突出, 临界有效应力, 突出强度

Abstract：The coal and gas outburst in crosscutting is the most serious dynamic disaster in coal mine in China. The relationship between the critical effective stress and the exposed area was deduced according to the fold catastrophe model. The maximum exposed areas of Fuxin Sunjiawan coal mine were presented under the different mining depth. The relationship between the exposed area and the critical effective stress was analyzed. The outburst coal seam at －1 100 m in Sunjiawan mine of Fuxin was studied. The experiment of the exposed area influencing the coal and gas outburst was performed using the triaxial outburst instrument designed and developed in-house and the coal briquette was put in the outburst instrument. The triaxial pressures were applied to the coal samples to simulate the stress environment of coal seam. The different exposed areas were simulated by changing the area of weak surface(30.19，34.21 and 38.48 cm2). The results show that the critical effective stress increases with the increasing of the exposed area. The calculated results agree with the experimental data，which verified the formula of the critical effective stress. The critical effective stress and exposed area are main factors of the intensity of coal and gas outburst in crosscutting. The distribution of coal powder after outburst has the characteristics of fluctuation. The outburst energy and intensity near the exposed face both increase with the increasing of exposed area and critical effective stress.

Key words： mining engineering exposed area coal and gas outburst critical effective stress intensity of outburst

引用本文:

唐巨鹏，丁佳会，于宁，路江伟. 有效应力对石门揭煤突出影响分析和试验研究[J]. 岩石力学与工程学报, 2018, 37(2): 282-290.
TANG Jupeng，DING Jiahui，YU Ning，LU Jiangwei. Analysis and experimental study on the effect of effective stress on coal and gas outburst in crosscutting#br#. , 2018, 37(2): 282-290.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.0280 或 http://www.rockmech.org/CN/Y2018/V37/I2/282

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