煤瓦斯多场耦合显微观测试验装置的研制与应用

发布时间：2018-09-09 20:24

【摘要】：为揭示在温度、地应力和瓦斯压力等多场作用下煤与瓦斯(methane)相互作用对煤矿瓦斯抽采、CO2注气强化瓦斯开采及CO2在深部不可采煤层的封存具有的重要意义,更精确地从微观角度观测在多物理场耦合条件下煤瓦斯相互作用的动态过程,研制了一种在多场耦合条件下带显微观测装置的煤瓦斯试验装置。该装置由密封容器与施力夹持机构、气压系统、温度场系统、显微观测系统4部分组成,能够通过显微观测装置结合图像处理技术,直接观测多场条件下煤与不同气体的相互作用所引起的细微变化。利用该装置进行了无应力加载、相同温度、相同气压下的瓦斯、CO2的吸附膨胀试验。研究发现,(1)试件在两种气体的变形大致经历了快速增长、缓慢增长直至平衡3个阶段,类似于吸附等温曲线;(2)试件在CO2气体中达到吸附饱和的时间比试件在瓦斯气体中达到吸附饱和的时间要短;(3)试件在瓦斯气体中的最大线性应变约为0.15%,相同条件下试件在CO2气体中的最大线应变约为0.5%,相同条件下试件在CO2气体中达到吸附饱和时的最大应变比试件在瓦斯气体中达到吸附饱和时的最大应变大3倍左右。研制的装置具有结构简单、直观、精度高的特点。
[Abstract]:In order to reveal the interaction between coal and gas (methane) under the action of temperature, ground stress and gas pressure, it is of great significance to strengthen the gas mining by CO _ 2 injection in coal mine gas extraction and the sealing of CO2 in deep non-mining coal seam. The dynamic process of coal-gas interaction under multi-physical field coupling condition is observed more accurately from the microscopic point of view. A coal-gas test device with micro-observation device under multi-field coupling condition is developed. The device consists of a sealed container and a force clamping mechanism, a pressure system, a temperature field system, and a microscopic observation system. It can be combined with image processing technology by means of a microscopic observation device. The subtle changes caused by the interaction between coal and different gases are observed directly under multi-field conditions. The adsorption and expansion experiments of CO _ 2 under the same pressure, same temperature and no stress loading were carried out by this device. It is found that (1) the deformation of the specimen in the two gases has roughly experienced three stages of rapid growth, slow growth and equilibrium. The adsorption isothermal curve is similar to the adsorption isothermal curve; (2) the time of reaching adsorption saturation in CO2 gas is shorter than that in gas; (3) the maximum linear strain of specimen in gas is about 0.15, and under the same condition, the maximum linear strain is about 0.15. The maximum linear strain of the specimen in CO2 gas is about 0.5. Under the same conditions, the maximum strain in CO2 gas is about 3 times greater than that in gas. The device has the characteristics of simple structure, intuitive and high precision.
【作者单位】：重庆大学煤矿灾害动力学与控制国家重点实验室;重庆大学资源与环境科学学院;
【基金】：国家自然科学基金(No.51174241)
【分类号】：TD712

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