【作者】 杨利平；

【导师】 王兆丰；

【作者基本信息】 河南理工大学 ， 安全技术及工程， 2007， 硕士

【摘要】 本文主要是对高瓦斯厚煤层综放工作面采空区瓦斯来源、流动以及抽放技术进行研究。结合试验矿井的实际条件,对采空区采用高位钻孔进行瓦斯抽放。为了得到高位钻孔的布孔层位,根据相似理论原理在实验室对试验工作面采空区进行相似材料模拟试验,观测出主要是冒落带分布区域;为了更简单、易行的得到“三带”范围,采用离散单元法的观点,利用计算机对采空区上覆岩层受采动影响后变形破坏过程进行了数值模拟,其模拟结果基本和相似材料模拟相同,确定了合理的布置抽放钻孔的层位。较系统的研究了采空区瓦斯的来源、涌出量大小、流动和储存规律,重点分析了采空区瓦斯运移的影响因素和其在采空区中的空间浓度分布特征,提出了进行采空区瓦斯抽放时合理的抽放范围,为采空区瓦斯抽放钻孔设计提供了依据;建立了采空区瓦斯运移的数学模型并对其进行了数值模拟。依据相似材料和数值模拟的结果,在试验工作面进行抽放钻孔设计,利用所设计的抽放钻孔对试验工作面采空区进行瓦斯抽放,经过考察,所设计施工的高位钻孔能够很好的满足采空区瓦斯治理的需要,简化了原有的抽放方式,解决了工作面瓦斯超限问题,取得了预期目标。更多还原

【Abstract】 The gas source, current and drainage is the mainly researched in the gob of fully mechanized longwall top coal caving workface of tick coal seam with enriched gas in the article. The horizon of borehole layout is assured by analyzing the mechanical model for overburden rock with the similar simulation test. And the numerical simulation of distinct element modeling is also adopted to modify the result. From the test result, the caving zone, crack zone, integral moving zone is obtained as well as the rational layout horizon. The law of the gas source, current, amounts of gas gush and storage is studied systemically, and the major analysis is stick to the influence factor to the gob gas current and the gas concentration distribution. The rational gas drainage zone is also put forward in the analysis. The mathematic model is set up and simulated using the computer. According to the result, the design for gob gas drainage is made, and effect can meet the need of gob gas drainage. It simplifies the former gas drainage system, and reduce the safety cost .更多还原