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煤体基质吸附(解吸)变形规律试验研究
引用本文:刘向峰,刘建军,吕祥锋,肖晓春,唐巨鹏.煤体基质吸附(解吸)变形规律试验研究[J].广西大学学报(自然科学版),2012(1):173-177.
作者姓名:刘向峰  刘建军  吕祥锋  肖晓春  唐巨鹏
作者单位:辽宁工程技术大学力学与工程学院;西南石油大学土木工程与建筑学院
基金项目:国家自然科学基金资助项目(50874082;11072102;51174170;51004061)
摘    要:为了更好的掌握煤体吸附(解吸)过程中变形规律,以晋城天地王坡煤矿为例,利用实验室模拟方法,在恒压、环境温度(室温20℃)一定的条件下,研究煤岩基质吸附(解吸)变形规律。实测了不同有效应力及加压方式下煤体的变形量,分析了煤基质吸附(解吸)后的变形规律,得到了弹性阶段煤体变形值与吸附(解吸)量的变化关系,并拟合得出了两者之间的函数关系。通过分析得出以下基本规律:①吸附(解吸)量与煤样应变(解吸过程为收缩变形)随时间的增加而增大,并逐渐趋于稳定,呈现指数分布规律;②吸附(解吸)变形可大致分为三个阶段,即第一阶段吸附(解吸)速度较快,变形量也较大,曲线斜率较大;第二阶段,随解吸量的增加,两者变化幅度相当,曲线斜率接近为1.0;第三阶段,当煤体收缩变形接近原始孔隙体积时,变形量不再增加,曲线斜率接近于零。试验结果为煤矿瓦斯合理抽采及防止煤与瓦斯突出提供了一定的理论依据。

关 键 词:煤层气  吸附(解吸)  煤基质变形  试验研究

An experimental research on the law of adsorption(desorption) deformation of coal matrix
LIU Xiang-feng,LIU Jian-jun,LV Xiang-feng,XIAO Xiao-chun,TANG Ju-peng.An experimental research on the law of adsorption(desorption) deformation of coal matrix[J].Journal of Guangxi University(Natural Science Edition),2012(1):173-177.
Authors:LIU Xiang-feng  LIU Jian-jun  LV Xiang-feng  XIAO Xiao-chun  TANG Ju-peng
Institution:1(1.School of Mechanics and Engineering,Liaoning Technical University,Fuxin 123000,China; 2.School of Civil Engineering and Architecture,Southwest Petroleum University,Chengdu 610500,China)
Abstract:In order to reveal the law of coal deformation in the process of adsorption(desorption),taking Tiandiwangpo Mine in Jincheng as an example,under the condition of constant temperature(20 ℃) and pressure,the experiment on adsorption,desorption and seepage of coalbed methane(CBM) and coal deformation was carried out.By the observation of coal deformation under different effective stresses and loading methods,the law of adsorption(desorption) deformation of coal matrix was analyzed.The relationship between adsorption(desorption) amount and coal deformation was obtained.And then the relationship expressions were studied.The law was obtained as follows: ①the adsorption(desorption) amount and coal deformation(shrinkage strain) were increased exponentially with time,and became stable gradually;②there are three stages in the process of adsorption(desorption) deformation of coal matrix.In the first stage,the rate of adsorption is high and the coal deformation is very large.Their relationship fits a high-slope curve.In the second stage,the amplitude of desorption and coal deformation is at the same level,and the slope of relationship curve is about 1.0.In the third stage,coal deformation no longer increases,and the slope of relationship curve is about zero,when the coal snaps back to its initial pore volume.These experimental results can provide theoretical basis for the security of CBM drainage and the control of coal-gas outburst.
Keywords:coalbed methane(CBM)  adsorption(desorption)  coal deformation  experimental research
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