Experimental Study on Permeability of Coal Samples under Different Effective Confining Pressure
In the course of coal extracting, surrounding rock mass around coal face and roadway was fractured or deformed. The original permeability state of surrounding rock mass was also changed, and the new uneven and anisotropy permeability filed was formed. Researches on permeability characteristics with the compression failure process of coal samples is of very important significance for evaluating hydrogeology condition of roof & floor during the extraction and for controlling of surrounding rock water irruption around mining area. In this paper, the permeability tests of coal samples under different confining pressure are carried out on MTS815.03 electro-hydraulic servo-controlled rock mechanical test system. The results show that the permeability rate curve and the whole stress-strain curve of coal almost have the same development trend. But the permeability rate-strain curve is relatively hysteretic which indicates that the close relativity between the evolvement of damage and the development of permeability rate and the permeability developing needs a time course. The permeability of coal presents the tendency of sharply falling on the whole while the effective confining pressure increasing. It shows that the rupture and development of cracks in coal are restricted by the confining pressure.
confining pressure coal permeability whole stress-strain process crack
XU Zhancai LI Yushou
Shanxi Xizhou Zhong Shi Evaluation Co. LTD.,Xinzhou 034000, Shanxi, China China University of Mining and Technology,Xuzhou 221008, Jiangsu,China
国际会议
The 2007 International Symposium on Safety Science and Technology(2007采矿科学与安全技术国际学术会议)
河南焦作
英文
545-549
2007-04-17（万方平台首次上网日期，不代表论文的发表时间）