Device for testing bonding strength of tunnel primary support and soil surrounding rock

The utility model belongs to the technical field of tunnel engineering test equipment, and particularly relates to a device for testing the bonding strength of a tunnel primary support and soil surrounding rock. According to the technical scheme, the device comprises a base, three reaction frames, a tangential arch pressure loading device, an axial arch pressure loading device, a surface force loading device and an oil cylinder oil jack power source with an indicating gauge, wherein the tangential arch pressure loading device, the axial arch pressure loading device and the surface force loading device are respectively fixed on the three reaction frames. Different loading modes of the sprayed concrete and the arch frame are controlled respectively, and the tangential bonding strength between the sprayed concrete and the arch frame and the arch frame mechanical behavior in a complex stress state are tested. The actual mechanical state of a large-section tunnel primary support and surrounding rock can be well si