Test device for simulating excavation of large-section variable-cross-section variable-clear-distance double-hole mountain tunnel

The utility model discloses a test device for simulating excavation of a large-section variable-cross-section variable-clear-distance double-hole mountain tunnel. The test device comprises a steel plate assembly model box with an opening in the upper end, a dynamic hydraulic loading device and a wooden cover plate. The test device can pressurize the side wall and the top of the model box by using a dynamic pressurizing hydraulic loading system to simulate the horizontal and vertical surrounding rock pressure of the mountain tunnel; according to the test device, excavation of a large-section variable-section variable-clear-distance double-hole tunnel can be achieved by changing the distance between the openings in the two ends of the model box and the tunnel section size of the cover plates at the openings; according to the test device, the load pressure effects of different surrounding rocks can be simulated by changing the force transmission mode of the loading device. 本实用新型公开了一种模拟大断面变截面变净距双洞山岭隧道开挖的试验装置，包括上端