基于瓦斯解吸特性推算煤层瓦斯压力的方法  

Determination of Coal Gas Pressure Based on Characteristics of Gas Desorption

作　　者：安丰华[1] 程远平[1] 吴冬梅[1] 李伟[1] 

机构地区：[1]中国矿业大学煤矿瓦斯治理国家工程研究中心,安全工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2011年第1期81-85,89,共6页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2005CB221503);国家自然科学基金重点项目(70533050),国家自然科学基金项目(50674089)

摘　　要：为了能够准确快速确定煤层瓦斯压力,基于煤层瓦斯解吸特性提出了确定煤层瓦斯压力的新方法.通过对煤屑瓦斯扩散过程理论解的进一步分析得出煤层瓦斯压力与煤屑解吸对1~3mm粒径煤样具有确定关系.解吸测定,通过不同公式对解吸数据的拟合分析发现对数公式能够更好的拟合解吸曲线,从而确定对数公式为最佳拟合公式.对数公式中系数A能够表明煤样在不同瓦斯压力下解吸趋势的差异性,与瓦斯压力具有指数关系.并且在不同暴露时间下其数值可以保持在稳定值,可以利用系数A与瓦斯压力的关系进行煤层瓦斯压力的推算.For determining coal gas pressure accurately and quickly,a new method is proposed based on characteristics of coal gas desorption.From the analyzing the theoretical solution of gas diffusion from coal cutting,the coal seam gas pressure has a determined relation with gas desorption quantity.In laboratory we measured the desorption data of screened coal sample with a size of 1~3 mm.From the analysis of desorption data we confirm that logarithmic formula can fit desorption curves better than other fitting formulas.Because coefficient A of the logarithmic formula indicates the difference of coal gas desorption characteristics with different gas pressure,it has an exponential relationship with gas pressure.And its value can keep stable with different exposure time.We can use the relationship of coefficient A and gas pressure to calculate gas pressure.

关 键 词：煤层瓦斯压力 解吸特性 对数公式 指数关系 

分 类 号：TD712[矿业工程—矿井通风与安全]