Shearing loading mechanism

The utility model relates to the technical field of geotechnical test simulation equipment, and provides a shear loading mechanism which comprises a shear box, a motor, a planetary roller lead screw mechanism, a push rod, a main sensor and an auxiliary sensor. The planetary roller lead screw mechanism is driven by the motor to push the push rod to provide shearing thrust for the soil sample, the main sensor and the auxiliary sensor are arranged on the push rod and the shearing box respectively and used for detecting pressure and displacement borne by the push rod and the shearing box respectively, and the shearing box is connected with the fixing plate through the auxiliary sensor. The planetary roller screw mechanism is used as a power transmission mechanism, so that compared with a ball screw with the same size, the planetary roller screw mechanism has higher load capacity and higher mechanical rigidity, and the size of equipment can be greatly reduced; meanwhile, the sensors are arranged on the push rod an