Patent ID: 7536921

Claim:
A base of a specimen cell for a triaxial testing apparatus, comprising; an upper cover having a first top face adapted to contact the specimen, a first bottom face recessed to form at least one first receiving groove, at least one group of through holes extending through said first top and bottom faces and connected fluidly to said first receiving groove, and a first pressure hole connected fluidly to said first receiving groove; at least one porous ceramic plate disposed in said first receiving groove; a lower cover disposed below said upper cover and having a second top face recessed to form a second receiving groove, and a second pressure hole communicating fluidly with said second receiving groove; a membrane unit disposed between said upper and lower covers, and including a non-permeable film and a screen stacked on said film, said film and said screen spanning said first and second receiving grooves; and a guide tube fluidly interconnecting said first and second pressure holes; wherein said upper and lower covers have outer peripheral ends which are connected sealingly to each other and which extend around said first and second receiving grooves, respectively.