Test device for excavation of super-large-section variable-cross-section city tunnel

The utility model discloses a test device for excavation of an extra-large-section variable-section city tunnel. The test device comprises a model box and a hydraulic loader, wherein the model box is formed by assembling steel plates, and the top end of the model box is provided with an opening. The test device can use a dynamic hydraulic loading system to simulate the load of an urban tunnel surface building group; the test device can realize excavation of tunnels with large sections, variable sections and the like by changing the shape and size of the tunnel sections of the cover plates at the openings at the two ends of the model box; the shape and size of the force transmission cushion block can be changed to achieve the effect of simulating different building loads. 本实用新型公开了一种用于特大断面变截面城市隧道开挖的试验装置，包括由钢板组装成的顶端开口的模型箱、液压加载器。本试验装置可以使用动态液压加载系统模拟城市隧道地表建筑群荷载；本试验装置可以通过改变模型箱两端开口处盖板的隧道断面形状大小，实现大断面、变截面等隧道的开挖；可以改变传力垫块的形状大小达到模拟不同建筑荷载的效果。