Biaxial test device

A biaxial testing device, characterized in that it is used to conduct an experiment on a sample (3), wherein the sample (3) comprises a rock sample inside of a rubber membrane, wherein the rubber membrane is provided with openings at the upper and lower ends of the sample, and each opening is connected to a water-permeable plate, wherein the biaxial testing device comprises:

• a bracket;
• a container (1) connected to a support comprising a detachable top cover (11);
• wherein the top cover (11) is provided with an exhaust hole and a through hole;
• the side wall of the container (1) is made of a transparent material;
• the sample (3) can be positioned inside the container (1);
• and there is a gap between the inner side wall of the container (1) and the sample (3);
• wherein two limit plates (22) are vertically connected to the inner bottom surface of the container (1);
• the two limit plates (22) are parallel to each other;
• the limit plates (22) are made of a transparent material;
• a sample (3) can be placed between the two limit plates (22) and the two limit plates (22) are against two sides of the sample (3);
• and
• a press machine connected to the support, wherein the press machine comprises a press rod (4), wherein the press rod (4) is able to move in a vertical direction, the press rod (4) passes through a through hole and being located in the container (1), the limit plates (22) are located on both sides below the press rod (4), the press rod (4) is able to move downward and abut against the top of the sample (3) so as to apply a vertical load to the sample (3);
• a mixing container (6) containing a multi-phase mixed fluid;
• an input pipeline, one end of which is connected to the mixing container (6), and the other end of which penetrates into the interior of the container (1) and abuts against a water-permeable plate at the upper end of the sample (3);
• wherein, the output pipe has one end that penetrates into the bottom of the container and contacts the water-permeable plate at the lower end of the sample (3), and the other end that passes out of the container and communicates with the outside world;
• and
• wherein a first pump body is arranged in the input pipeline and/or the output pipeline, and is used to allow the multiphase mixed fluid in the mixing container (6) to penetrate into the sample (3) through the input pipeline and then flow out from the output pipeline,
• wherein the biaxial testing device also includes:
• two mounting plates (23), wherein one mounting plate (23) corresponds to one limit plate (22), the two mounting plates (23) being vertically connected to the inner bottom surface of the container (1) and parallel to each other, wherein the two mounting plates (23) are respectively located on two sides of the sample (3), wherein the mounting plates (23) are provided with windows, and wherein the limit plates (22) are embedded in the windows;
• wherein the limit plate (22) is made of high-strength glass material, and the mounting plate (23) is made of metal material;
• wherein the side of the mounting plate (23) facing the specimen (3) is flush with the side of the corresponding limit plate (22) facing the specimen.