煤体温度对钻孔瓦斯放散特征的影响  

The Effect of Temperature on Coal gas Emission from the Borehole

作　　者：李建楼[1,2] 严家平[3] 

机构地区：[1]宿州学院资源与土木工程学院,安徽宿州234000 [2]安徽省煤矿勘探工程技术研究中心,安徽宿州234000 [3]安徽理工大学测绘学院,安徽淮南232001

出　　处：《宿州学院学报》2014年第12期92-94,共3页Journal of Suzhou University

基　　金：宿州学院安徽省煤矿勘探工程技术研究中心开放项目"煤体孔隙结构与瓦斯富集的相关性研究"(2014YKF02)

摘　　要：为了研究围岩中不同温度条件下煤层瓦斯抽采时的初始放散特征,使用了自行研制的煤体瓦斯吸附-解吸试验装置,建立了煤体钻孔瓦斯放散物理模型,分别在27.5℃和28℃条件下采用N2进行煤体的吸附试验和钻孔瓦斯放散试验,并在27.5℃条件下对比了CO2和N2放散特征,实验过程对瓦斯压力、总应力和钻孔瓦斯放散速度进行了监测。试验结果表明,瓦斯压力相同条件下,煤体有效应力随温度升高而增大,钻孔瓦斯的放散初始速度与煤体的有效应力呈明显的负相关关系;结果还表明,本试验中煤样对CO2的吸附量约为N2吸附量的5倍,且CO2的放散速度明显大于N2。In order to study the characteristics of initial coal gas emission during the process of coal gas extraction under conditions of different temperature of coal body clamped by strata,a self developed adsorption & desorption test device was used to establish a physics model.N2 was adopted to simulate coal gas adsorption and emission behaviour under 27.5℃ and 28℃respectively.CO2 and N2 were compared in the test.Gas pressure,total stress and gas emission velocity from borehole were monitored in the experiment.Experimental results show that effective stress increases when temperature is up and there is significant negative correlation between initial emission velocity of gas and effective stress of coal body.The results also show that the quantity of CO2 adsorpted is about 5times of that of N2 in this experiment.In addition,emission velocity of CO2 is obviously higher than that of N2.

关 键 词：温度 有效应力 煤体 瓦斯 放散 

分 类 号：TD712[矿业工程—矿井通风与安全]