【摘要】：煤巖動力災(zāi)害是煤巖體在外界應(yīng)力作用下在短時間內(nèi)發(fā)生的一種具有動力效應(yīng)和災(zāi)害后果的現(xiàn)象,是一種極其復(fù)雜的動力現(xiàn)象。煤巖變形破裂過程中產(chǎn)生的電磁、紅外輻射可有效快捷預(yù)測沖擊地壓、煤與瓦斯突出等動力災(zāi)害,實現(xiàn)非接觸式連續(xù)動態(tài)預(yù)測。主要研究成果如下:本文為了進行復(fù)合煤巖體變形破裂多物理場耦合模型的研究。自主研發(fā)了電磁輻射采集系統(tǒng)并制定了滿足項目要求的試驗方案。對電磁輻射強度信號、電磁輻射脈沖數(shù)信號與應(yīng)力的變化規(guī)律進行深入分析,分析發(fā)現(xiàn)三者具有較高的耦合性。進行了電磁輻射強度與電磁輻射脈沖數(shù)、電磁輻射強度與應(yīng)力的相關(guān)性研究,結(jié)果表明擬合度較高,前者的線性相關(guān)系數(shù)可達到0.9以上,后者的線性相關(guān)系數(shù)可達到0.8以上。對復(fù)合煤巖紅外輻射溫度與應(yīng)力變化規(guī)律進行對比分析,發(fā)現(xiàn)同樣具有一致性。對煤表面紅外輻射溫度與應(yīng)力應(yīng)變、頂板巖表面紅外輻射溫度與應(yīng)力應(yīng)變分別作了相關(guān)性研究,結(jié)果表明擬合度較高,線性相關(guān)系數(shù)均可達到0.9以上。在復(fù)合損傷因子的基礎(chǔ)上,建立受載復(fù)合煤巖破裂力電熱耦合模型并驗證模型。結(jié)果表明考慮熱損傷后,模型精確度得到提高。采用ANSYS有限元軟件進行了力電耦合場、力熱耦合場的仿真研究。其中力電耦合場的仿真研究,壓電效應(yīng)表明受載復(fù)合煤巖壓密階段沒有壓電效應(yīng)貢獻,彈性階段和彈塑性階段的壓電效應(yīng)表明壓力與感應(yīng)電荷的產(chǎn)生成線性關(guān)系;磁場分布仿真表明模型表面處的磁場強度最強,磁場強度與感應(yīng)電荷的變化成正比。理想均勻分布的磁場沒有方向性;力熱耦合場的仿真研究表明,摩擦生熱效應(yīng)反應(yīng)了裂隙處的摩擦生熱變化規(guī)律,溫度的變化與應(yīng)力的變化成正相關(guān)關(guān)系,總結(jié)以上仿真結(jié)果均符合實驗結(jié)論。論文研究成果對于進一步深入揭示煤與瓦斯突出等動力災(zāi)害演化機理,完善煤與瓦斯等煤巖動力災(zāi)害預(yù)測方法及保障煤礦安全生產(chǎn)具有重要的理論意義和實際應(yīng)用價值。
[Abstract]:The dynamic disaster of coal and rock is a kind of phenomenon with dynamic effect and disaster consequence which occurs in a short time under the action of external stress. It is a kind of extremely complex dynamic phenomenon. The electromagnetic and infrared radiation generated in the process of coal and rock deformation and rupture can effectively and quickly predict the dynamic disasters such as rock burst, coal and gas outburst, and realize the non-contact continuous dynamic prediction. The main research results are as follows: in order to study the multi-physical field coupling model of composite coal and rock mass deformation and fracture. The electromagnetic radiation acquisition system has been developed independently and the test scheme to meet the requirements of the project has been established. The variation law of electromagnetic radiation intensity signal, electromagnetic radiation pulse number signal and stress are deeply analyzed, and it is found that the three have high coupling. The correlation between the intensity of electromagnetic radiation and the number of pulses of electromagnetic radiation, the intensity of electromagnetic radiation and the stress is studied. The results show that the linear correlation coefficient of the former is more than 0.9. The linear correlation coefficient of the latter is more than 0.8. The variation of infrared radiation temperature and stress of composite coal and rock are compared and analyzed. The correlation between infrared radiation temperature and stress strain on coal surface and infrared radiation temperature on top slate surface and stress strain are studied respectively. The results show that the fitting degree is high and the linear correlation coefficient is above 0.9. On the basis of the composite damage factor, an electrothermal coupling model of the fracture force of loaded composite coal and rock is established and verified. The results show that the accuracy of the model is improved after heat damage is taken into account. The ANSYS finite element software is used to simulate the coupling field of force and electricity and the coupling field of force and heat. The simulation of the coupling field shows that there is no contribution to the piezoelectric effect in the compaction stage of the loaded composite coal and rock, and the piezoelectric effect in the elastic and elastic-plastic stages shows that the pressure is linearly related to the generation of the induced charge. The simulation of magnetic field distribution shows that the intensity of magnetic field on the surface of the model is the strongest, and the intensity of magnetic field is proportional to the change of inductive charge. The ideal uniform distribution of magnetic field has no directionality. The simulation results show that the friction heat generation effect reflects the law of friction heat generation in fracture, and the change of temperature has a positive correlation with the change of stress. The above simulation results are in accord with the experimental results. The research results of this paper have important theoretical significance and practical application value for further revealing the evolution mechanism of coal and gas outburst dynamic disasters, perfecting the prediction method of coal and gas dynamic disasters and ensuring the safety of coal mine production.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD315

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