Deep and large foundation pit deformation internal force physical simulation model experiment device

The invention discloses a deep and large foundation pit deformation internal force physical simulation model experiment device which comprises a model box, a supporting structure simulation system, a detachable loading system, a distributed optical fiber monitoring system and a computer processing system. Wherein a supporting structure simulation system is arranged in the model box; the support structure simulation system mainly simulates a support pile, a top beam, an inner support system and an anchor rod cable system. A detachable loading system is arranged outside the supporting structure, and the loading system can simulate uniform load and non-uniform load; the distributed optical fiber monitoring system is arranged on a supporting structure, the monitoring content of the distributed optical fiber monitoring system mainly comprises supporting system internal force monitoring, supporting pile top horizontal displacement and settlement monitoring, pile body internal force monitoring, supporting pile outer