An airbag-support test device for simulating partial tunnel excavation

Abstract

The invention discloses an air bag-anchoring testing device for simulating the divisional excavation of tunnels. The device comprises sectional air bags, lining structures, an inflating-deflating system and a data monitoring system, wherein the round lining structures are manufactured and simulated by adopting the PVC material; the air bags are arranged inside a PVC pipeline, and comprise 5 sections, each section of air bag is partitioned through a PE round partition plate, each partition plate is fixed through screws and the lining structure, and thus the stability of the air bags is guaranteed when the system works. A pressure sensor is arranged between each air bag and the pipe wall, and the sections of air bags are inflated and deflated through corresponding air pipes. An air compressor is used for realizing air inflation, air valves are adopted for controlling air deflation, pressure gages and gas volume flowmeters are used for accurately controlling the inflating and deflating process amount, and the pressure sensors are adopted for measuring the contact pressure between the air bags and the pipe wall. The air bag-anchoring testing device is convenient to operate, and can beused for carrying out the repeated inflating and deflating operations, the testing process can truly reflect the excavation process of the tunnels, and thus a solution is provided for the tunnel excavation model test.

Description

technical field [0001] The invention belongs to the field of underground engineering test equipment, and in particular relates to an airbag-supporting test device for simulating partial excavation of tunnels, which is mainly used to simulate the partial excavation process during actual tunnel construction. Background technique [0002] With the vigorous development of underground resources and the rapid development of tunnel construction, tunnel construction safety has also received more and more attention and attention. In order to effectively evaluate the safety of the tunnel construction process, it is necessary to simulate the tunnel excavation process more through model tests. In actual construction, the tunnel excavation process is a dynamic nonlinear process, the simulation of the excavation process is not accurate enough, and the tunnel excavation model test cannot reflect the nonlinear behavior of the actual project. [0003] Now the simulation of the tunnel excava...

AI Technical Summary

Problems solved by technology

On the one hand, the above-mentioned excavation methods cannot effectively reflect the dynamic process of tunnel excavation and unloading, and cannot well realize the tunnel excavation process; The support situation after excavation is inconsistent with the actual excavation state. At the same time, the simulation without support is likely to cause soil collapse, which is not conducive to summarizing the relevant laws during the excavation process

[0004] It can be seen from the above that the current simulation of the tunnel excavation process is not accurate enough to more truly reflect the tunnel excavation process in the actual project, and the inaccurate simulation of the excavation process will cause the model test to refine the problems in the project insufficiently , making the results less convincing

Images