Device and method for detecting deformation of section loess bias tunnel composite foundation

The invention discloses a deformation detection device and method for a section loess bias tunnel composite foundation, the deformation detection device comprises a U-shaped mounting frame, a heavy hammer and a sounding rod, a transverse plate and a stress plate are arranged between the inner walls of the two sides of the U-shaped mounting frame, and the U-shaped mounting frame is provided with a driving assembly; the counter weight is arranged at the bottom of the transverse plate, and the driving assembly drives the transverse plate and the counter weight to ascend and descend; the feeler lever is installed at the bottom of the stress plate, and the feeler lever is driven into the ground through the heavy hammer in the falling state. The driving assembly is arranged to drive the connecting piece to ascend and descend, and the connecting piece descends and drives the movable hook to make extrusion contact with the fixed hook, so that the movable hook and the fixed hook are hooked with each other, and therefo