摘要
煤层残余瓦斯压力是区域防突效果检验的关键指标之一,采用井下钻孔对其进行直接测定时成功率较低,因此普遍采用朗格缪尔方程间接计算获得,但该过程测试参数多、周期长、误差较大。为了更加准确快捷地获取煤层残余瓦斯压力,在理论分析基础上,使用自主搭建的定量补气装置进行试验罐的瓦斯量定量补偿和煤层瓦斯压力测定,对比分析试验测得的煤层瓦斯压力与理论计算煤层瓦斯压力、现场实测煤层瓦斯压力。结果表明:在恒温(与煤层温度一致)下,补偿瓦斯量后,试验罐内的瓦斯压力呈现急剧上升-缓慢下降-平衡稳定的变化特征,试验测得的煤层瓦斯压力与理论计算煤层瓦斯压力相对误差为4.46%~9.21%,与现场实测煤层瓦斯压力相对误差为2.73%~5.56%。相比朗格缪尔方程间接计算法,该方法可排除温度与水分对测压结果的影响,测试参数少,测试时间短;与井下钻孔直接测压相比,该方法无需封孔,不受测压地点限制。研究结果可为煤矿准确快捷获取预抽煤层残余瓦斯压力提供一种新方法,为煤矿瓦斯抽采达标评判和防突措施效果检验提供技术支撑。
The residual gas pressure of coal seam is one of the key indexes of regional outburst prevention effect test.The success rate of direct borehole measurement is low,and it is generally obtained by indirect calculation using Langmuir equation,but it has many test para-meters,long period and large error.In order to obtain the residual gas pressure of coal seam more accurately and quickly,on the basis of theoretical analysis,the self-built quantitative gas supply device is used to quantitatively compensate the gas volume of the test tank and measure the coal seam gas pressure,and the gas pressure value of coal seam measured by the experiment is compared and analyzed with the gas pressure value of coal seam calculated theoretically and measured on site.The results show that:Under constant temperature(con-sistent with the temperature of the coal seam),after compensating the gas amount,the gas pressure inside the test vessel exhibited a charac-teristic pattern of rapid increase-slow decrease-and eventual equilibrium stabilization.The relative error between the experimentally measured coal seam gas pressure value and the theoretically calculated coal seam gas pressure value is 4.46%-9.21%.The relative error between the experimentally measured coal seam gas pressure value and the coal seam gas pressure measured on site is 2.73%-5.56%.Compared with the indirect method of Langmuir equation,this method can exclude the influence of temperature and moisture on the pres-sure measurement results,and the test parameters are less and the test time is shorter.Compared with borehole measurement,this method does not need to be sealed and is not limited by the location of pressure measurement.The research results can provide a new method for coal mine to accurately and quickly obtain the residual gas pressure value of pre-pumped coal seam,and provide technical support for coal mine gas extraction standard evaluation and anti-outburst measures effect inspection.
作者
吴宽
王兆丰
李守一
刘军
陈勇
王俏
WU Kuan;WANG Zhaofeng;LI Shouyi;LIU Jun;CHEN Yong;WANG Qiao(College of Civil Engineering,Hunan City University,Yiyang 413000,China;School of Safety Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;College of Resources,Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411100,China;Chongqing Research Institute of China Coal Science and Industry Group Co.,Ltd.,Chongqing 400037,China)
出处
《煤炭科学技术》
北大核心
2025年第10期165-173,共9页
Coal Science and Technology
基金
国家自然科学基金资助项目(52074107,52474215)
湖南省自然科学基金区域联合基金资助项目(2025JJ70386)。
关键词
残余瓦斯压力
预抽煤层
瓦斯量
定量补偿
确定方法
residual gas pressure
pre-pumped coal seam
gas quantity
quantitatively compensate
determination method
