期刊论文

Liu, W.(guarenliuwei@126.com)

中文

岩土力学

1000-7598

2014

35

S1

85-90

10.16285/j.rsm.2014.s1.008

No.51274187:国家自然科学基金 No.51104108:国家自然科学基金 No.51304187:国家自然科学基金

本校为其他机构

针对深部地层同一种泥岩,先后采用常规渗透测试、变围压渗透测试和三轴压缩下瞬态法3种方法开展渗透率的测试研究。试验发现,3种方法下泥岩的渗透率差别极大,其中常规渗透测试所得的渗透率高出后两种方法 3~5个数量级;变围压法在围压大于5 MPa后与三轴压缩下的瞬态法所测得的渗透率值较为接近;瞬态法下泥岩渗透率随偏应力增加而缓慢降低,偏应力高达30 MPa时仍未出现扩容现象。测试显示泥岩的渗透率具有强烈的压力敏感性,其内在原因是较高围压下裂隙闭合、孔隙压紧、孔喉连通性减小,进而导致渗透率下降,而制样、烘干处理等对渗透率也有一定影响。基于试验结果与泥岩所处实际地层应力状态,提出可采...

For the same deep mudstone, three testing methods of permeability (conventional testing method, variable confining pressure method, and pulse method under triaxial compression) have been conducted respectively. According to the testing results, large difference of permeability was found inbetween the three methods, in which the permeability of conventional method is 3-5 orders higher than those of the other two methods. The results of variable confining pressures method while its confining pressure exceeds about 5 MPa approach relatively the re...