Equivalent model for tunnel blasting excavation test and using method thereof

Abstract

The invention relates to an equivalent model for simulating a tunnel blasting excavation test and a using method thereof. The model comprises a main box body used for the tunnel excavation test, the main box body is of a #-shaped steel plate combined structure, and plates are connected through high-strength bolts; a pre-embedded monitoring unit is arranged in the main box body and is connected with a computer through a lead hole; aninjection device is slightly smaller than the hole size and is located in the hole mouth, an air bag belt is arranged on the outer side of the wall of the shell and connected with a pneumatic pump, and the whole hole gap is filled with the air bag belt after inflation; a liquid storage box is embedded in a box clamping groove, a pusher is located at the lower end of the liquid storage box, and an inner pushing device and an outer pushing device are independently arranged and controlled by a rotating pulley. The tunnel blasting excavation process can be effectively simulated, the operation is simple, and the degradation influence on materials in the injection process can be fully considered; the surrounding rock damage variable is equivalent to the model by utilizing the similarity ratio, so that the loosening and deterioration effect of the surrounding rock in the blasting excavation process can be effectively simulated, and the engineering practice characteristics are comprehensively reflected.

Description

technical field [0001] The invention relates to the technical field of construction models, in particular to an equivalent model used for tunnel blasting excavation tests and a method for using the same. Background technique [0002] In recent years, with the acceleration of "new infrastructure", intercity high-speed railway and urban rail transit, as one of the seven major areas of "new infrastructure", have greatly promoted the construction of tunnel projects. Blasting excavation has the characteristics of instantaneous, sudden and highly destructive, which will inevitably cause damage to the instrument. It is difficult to obtain corresponding data effectively by existing monitoring methods, and the mechanism of tunnel disturbance is still an urgent problem to be solved. [0003] The model test can reflect the physical phenomenon of the tunnel more intuitively and reveal the tunnel failure mechanism. Therefore, the comparison between model test results and on-site monitor...

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Problems solved by technology

[0004] In previous model test systems, blasting damage to surrounding rock was seldom taken into account during model excavation; or by using low-strength materials at the opening, the loosening and deterioration effect of hard rock during blasting and excavation could not be effectively simulated , so there is a large deviation between the model test and the actual project, and it is difficult to truly realize the quantitative characterization of the loose ring during the blasting excavation process in the model test

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