大型煤（岩）样复杂受力破坏过程的红外信息研究

Because of constant development of mining industry, with the constant increasing depth of mining, mining pressure rising, rock-burst in underground exploiting, coal (rock) gas outburst, roof sudden calamity and so on calamities have become the main influence factors of mining safety. The research purpose of project lies in, by the study on infrared information of coal (rock) sample during the process of failure, finding the dependence between the coal (rock) sample destroy evolving course and the law of infrared information changing, For realizing and utilizing infrared technology in mining lose steady monitor and predict that makes basic research..In this text, to a large number of coal, rock, concrete( the hole in a utensil including different section forms ) samples under the single axle, muti-axle,etc. strength state, by infrared thermal imaging system, infrared frequency spectrum, etc. monitoring the process of failure, and analyzed and compared synthetically the collected infrared information with coal( rock) sample general mechanics nature and the mechanics behavior embodied in concrete experiment, and drew relevant conclusions.A large number of experimental results indicate that: except a small amount of rigidity heavy, which failure forms showing obvious fragility destruction, most of coal( rock) samples infrared radiation temperature change can take place while they are destroyed, but the degree of change has something to do with the sample of rock character and the loading ways.Most of the samples show temperature rising in the course of testing, however, there are a small amount of ones (the coal as the master) that demonstrate the temperature dropping.On the whole, samples' infrared radiation temperature changes greater while pressed destroying and cut destroying, but changes smaller while drawn destroying. The law of sample infrared radiation temperature change has better corresponding relation to its deformation stress-strain curve. During the sample course of little crack pressed densely and elasticity deformation stage, its examined surface's temperature changes smaller, and shows the temperature rising wholly; From sample dilatation to peak intensity, examined surface's temperature changes greater and distributed not even, this stage in the examined surface temperature changed greater area, macroscopic cracks emerge more finally; After the peak intensity that is in the destroying stage, samples' temperature rising area mostly appears in macroscopic break surface nearby, sometimes appears during the whole experiment course and the highest temperature rising.Sample in circulation loaded experiment; infrared temperature change can appear similar to" Kaiser effect " phenomenon in the sound launches of experiment.Experiment research indicates that coal( rock) sample after being moisture, the ability of its infrared radiation reduce more than the same kind of dryness of it.In utilizing concrete sample simulated underground cave experiment, sample temperature change and its area has heavy relation with enclosing size during the course of experiment.According to experiment phenomenon observed, put forward 3 main factors that result in temperature change during the course of sample deformation and destruction: Sample plasticity, crackle expanding, friction among the rock particles and crack surfaces.The power of plasticity relates to the strain rate of plasticity. Coal( rock) ,because of uneven quality and existing a lot of original defect, plasticity deformation takes place during the whole experiment course.Crackle expanding causes temperature rising near its peak, which size of temperature change has something to do with the following factors: the crackle-peak stress state, the speed of crackle expanding, etc. In this project, utilize static Model Ⅲ crackle plastic deformation analyzed solving in ideal elasticity-plasticity medium under yield condition among a small circle and set up one heat source model, Used to describe that the crackle expanding has impact on the temperature field of c

对大型煤岩样受复杂载荷作用下，模拟深部煤岩受力状态；首次系统地研究大型煤岩样强度效应、破坏方式、破坏形式、变形特征与红外信息之间的关系和红外辐射变化规律，特别是剧烈破坏前兆红外信息研究。通过综合分析，提供预测、预报灾害发生的红外信息。对矿山灾害定时、定位预测、预报，减轻甚至消除灾害，保证安全生产，具有重大的科学意义。