Torsional shear type structure and soil friction characteristic in-situ test device and working method thereof

The invention discloses a torsional shear type structure and soil friction characteristic in-situ test device and a working method thereof. The device comprises an upper sleeve, a lower sleeve and a torsional shear device and is characterized in that a structural sample is a hollow cylindrical prefabricated part, the cross section of the structural sample is in a square hole copper coin shape, andthe structural sample is fixedly installed on a square rotating shaft in the middle of a torsional shear device, the structural sample is driven by an upper torque output control device to rotate around a mandrel at a set angular speed, a cylindrical shearing surface is formed in foundation soil, a front end of the torsional shear device is connected with a permeable stone with a built-in pore pressure sensor, and the torque output control device, the square rotating shaft and the permeable stone take the mandrel as the center. The device is advantaged in that installation disturbance is small, the area of the contac