True triaxial rigid-flexible mixed loading device capable of realizing deep well filling material forming

The invention relates to the technical field of deep well filling tests, in particular to a true triaxial rigid-flexible mixed loading device capable of forming a deep well filling material, which comprises a counter-force frame, a front side flexible loading assembly is detachably mounted on the front side of the counter-force frame, and a rear side flexible loading assembly is detachably mounted on the rear side of the counter-force frame; the front side flexible loading assembly comprises a front pressing block, a front latex film is arranged on the side, facing the counter-force frame, of the front pressing block, and a first flexible pressure-bearing bag is formed between the front latex film and the front pressing block. The rear side flexible loading assembly comprises a rear pressing block, a rear latex film is arranged on the side, facing the counter-force frame, of the rear pressing block, and a second flexible pressure-bearing bag is formed between the rear latex film and the rear pressing block. A