摘要
为了深入研究煤体与瓦斯相互作用的变形特性,利用自主研发的三轴应力下煤样吸附变形动态测试系统,开展三轴应力状态下CO_2和CH_4气体在软煤和硬煤中吸附量以及吸附变形的动态测试试验,建立了三轴应力下煤样吸附气体变形模型。试验结果表明:(1)软煤和硬煤在三轴应力条件下对CO_2和CH_4气体的吸附曲线符合Langmuir方程。三轴应力状态下软煤的吸附能力远大于硬煤的吸附能力,且两种煤样对CH_4的吸附量都小于CO_2。(2)在应力恒定状态下,软煤吸附气体后的变形大于硬煤吸附气体后的变形。(3)软煤与硬煤在三轴应力下的吸附变形动态演化过程可以划分为初始快速变形阶段、缓慢变形发展阶段和变形稳定阶段3个阶段。(4)三轴应力下煤样的变形量随着吸附量的增加而增大。
In order to further study the deformation characteristics of interaction between coal and gas,a dynamic test system of adsorption deformation for coal sample under triaxial stress was developed to measure the adsorption capacity and adsorption deformation of carbon dioxide and methane in soft coal and hard coal of the dynamic test under triaxial stress,and established the deformation model of gas adsorbed by coal under triaxial stress. The results show that：（1）The adsorption curves of soft coal and hard coal to carbon dioxide and methane gas under triaxial stress condition meet with the Langmuir equation.The adsorption capacity of soft coal is larger than hard coal under triaxial stress condition,and the amount of methane adsorbed by both coal samples is less than that of carbon dioxide.（2） Under the condition of constant stress,the deformation of soft coal adsorbed gas is greater than that of hard coal adsorbed gas.（3） The dynamic evolution process of adsorption deformation for soft coal and hard coal under triaxial stress can be divided into three stages： initial rapid deformation stage,slow deformation development stage and deformation stability stage.（4） The deformation of coal samples increases with the increase of adsorption capacity under triaxial stress.
作者
陈结
潘孝康
姜德义
范金洋
欧阳振华
孙海涛
CHEN Jie;PAN Xiaokang;JIANG Deyi;FAN Jinyang;OUYANG Zhenhua;SUN Haitao(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;College of Resource and Environ-mental Sciences,Chongqing University,Chongqing 400044,China;North China Institute of Science and Technology,Hebei 065201,China;China Coal Technology Engineering Groap Chongqing Research lnstitute,Chongqing 400037,China)
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2018年第B06期149-157,共9页
Journal of China Coal Society
基金
重庆市自然科学基金资助项目(cstc2015jcyj A90011)
国家科技重大专项资助项目(2016ZX05045-001)
国家重点研发计划资助项目(2017YFC0804202)
关键词
煤
吸附
变形
动态
三轴应力
coal
adsorption
deformation
dynamic
triaxial stress
