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组合煤岩的强度弱化减冲原理及其应用 【作者】陆菜平 【导师】窦林名

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^;D{9g V {%IB0组合煤岩的强度弱化减冲原理及其应用

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e*Ag+os^!b0【作者】陆菜平 【导师窦林名水利论文!~"z#?Ah{sk:\
【作者基本信息】中国矿业大学,采矿工程,2008年,博士

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W2\w akN/j?KQ4N0【中文摘要】 随着矿井开采规模和深度的逐年增加,冲击矿压致灾的强度及其危害越显突出,同时增加了诱发煤与瓦斯突出、瓦斯爆炸等重特大灾害的可能性。因此,弱化和控制冲击矿压的显现强度就成为防治矿井煤岩动力灾害的关键。冲击矿压的发生载体就是“顶板-煤层-底板”组合煤岩系统。以此,论文研究提出了组合煤岩的强度弱化减冲原理。即弱化顶底板的强度及整体性厚度、煤体的强度就可以降低组合煤岩系统的冲击倾向性和冲能,保持煤岩体能量耗散与能量释放之间的动态平衡,使得煤岩体内部积聚的冲能维持较低水平,同时降低区域的应力集中梯度,实现冲击矿压灾害的强度弱化。采用Disp-24声电系统,实验研究了煤岩组合冲击倾向性与顶板的强度及厚度、煤样强度之间的演变规律,建立了煤岩组合的冲击倾向性与声电信号特征参数之间的相关关系,尤其是冲击破坏前兆的声电效应。研究表明,煤岩组合的冲击倾向性、声电信号强度与顶板的强度及厚度、煤样强度之间呈正相关关系。利用TDS-6微震实验以及现场监测,研究了组合煤岩体的冲击倾向性、顶板的厚度与微震强度之间的相关性,揭示了冲击前兆微震振幅与频谱的演变规律。研究表明,组合试样的冲击倾向性、顶板的厚度与微震强度之间呈...更多正相关关系,且随着冲击倾向性的增强,微震呈现振幅增加、频谱降低的演变规律。采用FLAC2D软件的Dynamic模块,模拟研究了不同能量的冲击动载,顶板的强度及厚度、煤体强度对巷道冲击效应的影响规律,再现了巷道冲击破坏的动态过程。研究表明,冲击动载能量(矿震)、顶板的强度及其厚度、煤体的强度越高,则巷道冲击破坏的强度越强。基于能量耗散与释放原理,研究了组合煤岩体从静载变形向动载冲击的力学过程及判定准则,揭示了冲能与冲击倾向性之间的相互关系,研究了组合煤岩体冲击破坏的声电效应机理,建立了组合煤岩冲击破坏的能量判据,并详细分析了组合煤岩冲击效应的关键影响因素。由此,建立了组合煤岩的强度弱化减冲原理的理论模型,进一步研究了煤岩体强度弱化的关键技术参数以及弱化解危效果的综合检验技术。通过徐州三河尖煤矿9202高冲击危险工作面冲击矿压的弱化控制实践,详细分析了影响工作面冲击强度的关键因素,以此,提出了以煤层与顶板的深孔卸压爆破相结合的强度弱化减冲技术,并建立了弱化解危效果的综合检验技术,最终保证了工作面的安全生产。  还原水利论文3kO(Y9];n]}@4Z0}-b

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【英文摘要】 Along with the mining scale and depth yearly increase, the catastrophe intensity and the harm induced by rockbursts are more obviously prominent. Simultaneously, it increases the possibility of the major disasters such as coal and gas outburst and gas explosion. So, weakening and controlling the appearance intensity of rockbursts is a key focus to prevent the coal-rock dynamic disasters in coal mines.The occurred vector of rockbursts is the compound coal-rock system composed by roof, coal seam and floor. On above, this thesis proposes the intensity weakening theory for rockburst of compound coal-rock. By weakening the strength of roof, coal materials and floor, and roof integrated thickness, the rockburst tendency and surplus energy of compound coal-rock system can be greatly declined, the dynamic balance between the energy dissipation and release can be maintained, the rockburst surplus energy accumulated in the coal-rock materials will be able to maintain a relatively low level, and ...更多the regional stress concentration gradient can be decreased, so the rockburst catastrophe intensity can be weakened.By the Disp-24 acoustic-electromagnetic (AE&EME) system in the experiments, the evolvement rules between the rockburst tendency indexes and roof strength and thickness, coal material strength of compound coal-rock was studied in thesis, the correlation between the rockburst tendency and the AE&EME signal characteristic parameters of compound coal-rock was established, espicially the omen AE&EME effect rules of rockburst failure. The results indicated the positive correlation between rockburst tendency and intensity of AE&EME signals, strength and thickness of roof, strength of the coal material.With TDS-6 microseismic (MS) experiment and monitoring research on spot, the correlation between rockburst tendency of the compound coal-rock material and roof thickness and MS intensity was studied, the evolvement rules of rockburst omen MS amplitude and frequency-spectrum was revealed. The results indicated the positive correlation between rockburst tendency of compound samples, roof thickness and MS intensity, and along with the rockburst tendency adding, MS signal presented the evolement rule of the increasing amplitude and the lower frequency-spectrum.By the Dynamic model function of FLAC2D numerical simulation software, the influential rules of different energy impact load, the strength and thickness of roof, the strength of coal material on the roadway rockburst effect was studied, the dynamic rockbust failure process of roadway was simulated. The results indicated that the higher the dynamic load impact energy (MS), the strength and thickness of roof and strength of coal material was, the stronger the roadway rockburst intensity was.On the basis of the theory about energy dissipation and release, the mechanical process and criterian from static deformation to dynamic rockburst was studied, the relation between rockburst surplus energy and rockburst tendency was revealed, the AE&EME effect mechanism of rockburst failure of compound coal-rock material was studied, the energy criterion of rockburst failure of compound coal-rock material was established, the main influential factors of compound coal-rock rockburst intensity was analyzed in detail.So, the model of the intensity weakening theory for rockburst of compound coal-rock was established, the key parameters and the effect testing system of intensity weakening of coal and rock materials was studied.By rockburst intensity weakening and controlling practice in 9202 higher danger working face of Sanhejian coal mine belong to Xuzhou Coal Mining Group (XCMG), the key factors affected rockburst intensity of working face were analyzed in detail,on above, the intensity weakening technology for rockburst of coal seam and roof strata deep hole relieve-shot was proposed, the synthetical testing system of intensity weakening effect was established, the safety production of working face was ensured ultimately.  还原水利论文S$v+SJ!cOD:Pl

1l"Ao6w? ct_7~0【中文关键词】 采矿工程; 冲击矿压; 组合煤岩; 强度弱化减冲原理
9p[mH{$U3nM0【英文关键词】 mining engineering; rockburst; compound coal-rock; intensity weakening theory for rockburst

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