Device, method, equipment and medium for measuring deformation of geotechnical material under triaxial test

The invention belongs to the technical field of geotechnical material deformation measurement, and discloses a device, method, equipment and medium for measuring geotechnical material deformation under a triaxial test, and the device comprises an angle sensor used for measuring the rotation angle of a cantilever beam structure; the cantilever beam structure comprises two sections of cantilever beams which are connected through an extensible resistor, one end of the cantilever beam structure is connected with the angle sensor, the other end of the cantilever beam structure is rotatably fixed on the buckle structure and is connected with the geotechnical material sample through the buckle structure, and the two sections of cantilever beams are rigid and non-deformable; the sleeve comprises a primary coil, two secondary coils, a coil framework and a shell, one end of the sleeve is connected with the angle sensor, the other end of the sleeve changes the relative position of the iron core in the sleeve through a s