综放开采初放期放煤口附近煤体瓦斯压力及内能分析  

Analysis of Coal Mass Gas Pressure and Intrinsic Gas Energy near Coal Caving Mouth during Primary Caving Period of Fully MechanizedCaving Mining

作　　者：夏永军[1] 

机构地区：[1]煤炭科学研究总院重庆研究院,重庆400037

出　　处：《煤矿安全》2009年第4期8-10,15,共4页Safety in Coal Mines

基　　金：国家重点基础研究发展计划(973)资助项目(2005CB221503)

摘　　要：放顶煤开采顶煤初次垮落是一个复杂的动力过程,在综放面循环向前推进时,煤体瓦斯渗流场结构发生变化。为探索综放面前方煤体瓦斯压力的分布变化规律,进一步对瓦斯内能进行分析,研究初放期煤岩发生动力灾害的可能性,有效的进行瓦斯综合治理,本文运用AN-SYS10.0的瞬态分析模块对综放面采场附近瓦斯压力进行了模拟分析。研究表明,综放面在推进过程中前方卸压区瓦斯压力变化梯度大,在应力集中区瓦斯压力较高,压力梯度变化小;初放期在工作面前方附近首轮循环放顶煤形成的瓦斯压力梯度比第二轮循环形成的瓦斯压力梯度大;瓦斯膨胀做功有利于突出的发生。The initial caving in the top coal caving is a complicated dynamic process. When the fully mechanized caving face propels forward cyclically, the seepage field structure of the coal mass gas changes. To discover the distribution and variation of the coal mass gas pressure in front of the fully mechanized caving face, further analysis the intrinsic gas energy, study the possibility of coal rock dynamic disasters during the primary caving period, and to have an effectively comprehensive gas control, this paper makes a simulation analysis of the gas pressure near the face stope based on the ANSYS10.0 transient analysis model. This study shows that the stress gradient in the distressed zone which is in front of the face changed greatly during the face propulsion, and the stress in the stress concertnation regions is high while its gradient change is small; during the primary caving period, the stress gradient in front of the working face formed by the first cycle of the top caving is greater than that is formed by the second cycle of the top caving; gas expansion is beneficial to the outburst.

关 键 词：综放面 放顶煤 瓦斯压力 垮落 瓦斯内能 

分 类 号：TD712[矿业工程—矿井通风与安全]