摘要
以铁新煤矿9#煤为原料制成的型煤为研究对象,利用自行研制的应力-解吸-渗流煤体变形试验装置,开展了不同围压和孔隙压力条件下的解吸-渗流试验.结果表明:在解吸-渗流过程中,围压恒定,孔隙压力以0.5 MPa/次的梯度降低时,煤体径向变形在1.0~1.5h内达到稳定;孔隙压力降低过程中,煤体径向应变增大,孔隙压力与径向应变呈二次函数关系,且解吸作用对煤体变形有一定的影响;在围压为5.0 MPa时,随着孔隙压力的减小渗透率先减小后增加,表明渗透率存在一个最小值,并且围压越大,最小渗透率对应的孔隙压力越大,渗透率存在最小值是由于解吸和有效围压的共同作用.
The desorption and seepage experiments under the conditions of different confining pressures and pore pressures were carried out on briquettes of 9#coal which were taken from Tiexin coal mine in China by using the self-developed desorption-seepage-stress deformation test apparatus.The results show that in the process of desorption and seepage,when the confining stress is constant and the pore pressure reduces with the gradient of 0.5 MPa,the radial strain reaches stability in 1.0—1.5 h.In the process of the pore pressure reducing,the radial strain of the coal body increases.The pore pressure has a quadratic function relationship with radial strain,and the deformation is also influenced by desorption.When the confining pressure is 5.0 MPa,the permeability of coal decreases firstly and then increases with the decrease of pore pressure.The permeability exist a minimum value,and the greater confining stress,the greater the pore pressure values.The minimum permeability is caused by adsorption/desorption and effective confining pressure.
作者
梁冰
贾立锋
孙维吉
姜云
LIANG Bing;JIA Lifeng;SUN Weiji;JIANG Yun(School of Mechanics and Engineering,Liaoning Technical University,Fuxin,Liaoning 123000,China;School of Mining,Liaoning Technical University,Fuxin,Liaoning 123000,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2018年第5期935-941,共7页
Journal of China University of Mining & Technology
基金
国家重点研发计划项目(2016YFC0801404
2016YFC0600704)
国家自然科学基金青年科学基金项目(51304111)
关键词
解吸-渗流
流固耦合
煤体变形
渗透率
desorption and seepage
fluid-solid coupling
deformation of coal matrix
permeability
