Underground cavern surrounding rock seepage state evolution law simulation test device and method

The invention provides an underground cavern surrounding rock seepage state evolution law simulation test device and method. The test device comprises a high-pressure sealed water tank, a three-way load loading system, a model test body containing an underground cavity and a parameter measurement system, the three-way load loading system comprises loading oil cylinders arranged on the upper side, the lower side, the left side, the right side, the front side and the rear side of a high-pressure sealing water tank. The parameter measuring system comprises a control platform and a signal collecting unit. The signal acquisition unit comprises a strain gauge, an infrared camera device and a seepage pressure and seepage flow acquisition device which are arranged in the underground cavern of the model test body. A model test body containing the underground cavern is placed in a high-pressure water tank, leakage of underground water in surrounding rock to a free face of the cavern is achieved through loading and unlo