煤与瓦斯突出物理模拟试验中甲烷相似气体的探索

发布时间：2018-11-11 11:55

【摘要】：当前煤与瓦斯突出物理模拟试验多采用二氧化碳代替甲烷,导致试验结果偏差较大。为了保证模拟试验相似性并规避甲烷气体带来的安全风险,提出了甲烷相似气体的概念。基于瓦斯在突出过程中的作用机制和相似准则,结合煤与瓦斯突出防治规定,建立了以瓦斯含量、瓦斯放散初速度、初始瓦斯膨胀能和含瓦斯煤力学性质为参数的相似指标。初步采用二氧化碳体积分数为20%、40%、60%、80%的二氧化碳和氮气二元混合气体作为甲烷相似气体的筛选气体。按照相关规范,分别测定了甲烷和筛选气体的相似指标参数值,确定了与瓦斯含量、瓦斯放散初速度、初始瓦斯膨胀能和含瓦斯煤力学性质接近的混合气体组分分别是二氧化碳体积分数为60%、35%、45%和54%。相关性分析结果表明,上述4种配比气体与甲烷性质相关性高,可以作为相似气体的待定气体。采用待定气体和甲烷进行了模拟试验,结果表明,二氧化碳体积分数为45%的混合气体的突出现象和突出临界值与甲烷接近,与甲烷相似性高。
[Abstract]:At present, carbon dioxide is used to replace methane in the physical simulation of coal and gas outburst, which results in a large deviation of test results. In order to ensure the similarity of simulation experiments and avoid the safety risks caused by methane gas, the concept of methane similar gas is proposed. Based on the action mechanism and similar criteria of gas in the process of outburst and combined with the regulation of prevention and control of coal and gas outburst, a similar index with gas content, initial velocity of gas release, initial gas expansion energy and mechanical properties of gas-bearing coal was established. The binary mixture of carbon dioxide and nitrogen with a carbon dioxide volume fraction of 20% and 40% carbon dioxide as a screening gas for similar methane gases was preliminarily used. In accordance with the relevant norms, the similar index parameter values of methane and screened gases were determined, and the content of methane and the initial velocity of gas release were determined. The initial gas expansion energy and the mixture gas component with similar mechanical properties of gas-bearing coal are 60 ~ 35% carbon dioxide volume fraction and 54% carbon dioxide fraction respectively. The results of correlation analysis show that the above four kinds of gases have high correlation with methane properties and can be used as undetermined gases of similar gases. Simulation experiments were carried out using undetermined gas and methane. The results show that the outburst phenomenon and critical value of the mixture gas with 45% carbon dioxide volume fraction are close to methane and have high similarity with methane.
【作者单位】：山东大学岩土与结构工程研究中心;淮南矿业集团深部煤炭开采与环境保护国家重点实验室;
【分类号】：TD821

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