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针对含填充物的双裂隙岩体,利用惰性气体渗透测试系统,在一次围压加卸载下对试样进行渗透率和孔隙度的精确测量,研究了裂隙中填充物及交界面渗透特性随裂隙间距变化的规律。结果表明,单裂隙与双裂隙试样渗透率随围压变化规律大致相同;在加载阶段,随着裂隙间距的减小,裂隙之间的相互作用增大,孔隙度随围压减小的更为显著,而单裂隙孔隙度随围压变化最不明显;随着裂隙间距的增大,各试样渗透率相应减小,而由于单裂隙试样比双裂隙试样缺少两个渗透交界面,因此其渗透率在低围压下远小于双裂隙试样。
Aimed at the double fractured rock mass with filler, the permeability and porosity of the sample were accurately measured by inert gas permeation test system under a confining pressure unloading. The effects of the infiltration properties of the filler and interface at the fracture Pitch changes in the law. The results show that the permeability of single-fractured and double-fractured specimens is almost the same with the change of confining pressure. During the loading phase, the interaction between the fractures increases with the decrease of fracture spacing, and the porosity decreases with the decrease of confining pressure But the change of single-fracture porosity with confining pressure is the least obvious. With the increase of fracture spacing, the permeability of each sample decreases correspondingly. However, the permeability of single-fracture specimens is lower than that of double-fracture specimens , So its permeability is much lower than the double fracture specimen under low confining pressure.