A modular tunnel excavation simulation test device and its assembly method

Abstract

The invention provides a modular tunnel excavation simulation test device and its assembly method, including a driving part, the output end of the driving part is connected to a tunnel model, and the driving part is used to drive the use diameter of the tunnel model itself. The tunnel model is composed of at least one group of excavation modules, and the end of the tunnel model away from the driving part is provided with a closed assembly, and the driving part is connected with a fixed rod, and the fixed rod is used to connect the end of the tunnel model Fixed on the driving part, the present invention can assemble tunnel excavation simulation test devices of different lengths according to the simulation requirements; the use of fixed rods can ensure the connection strength, avoid separation or deformation of the tunnel model under the action of centrifugal force, and make it always Maintain good linearity; and the tunnel model can change its own diameter under the action of the driving components, simulating the formation loss of the tunnel under the action of gravity, which is more consistent with the actual construction, so as to ensure the accuracy and reliability of the test data.

Description

technical field [0001] The invention relates to the technical field of tunnel construction test equipment, in particular to a modular tunnel excavation simulation test device and an assembly method thereof. Background technique [0002] In the construction of modern cities, the construction of underground rail transit is becoming more and more popular. However, due to the limitation of urban construction space, tunnel construction must inevitably pass through or under existing facilities, such as tunnels passing through the pile foundation of buildings. , passing under various underground pipes and cables, etc. In the process of tunnel construction, the volume of the actual excavated soil is larger than the volume of the completed tunnel, and the difference between the two is called stratum loss. This stratum loss will lead to different degrees of settlement or uplift of the ground and tunnel. With advanced shield technology, it is difficult to completely prevent these defo...

AI Technical Summary

Problems solved by technology

[0004] 1. Underground tunnel excavation is a dynamic construction process, so it is necessary to use tunnel excavation simulation test devices of different lengths to simulate the excavation progress at different nodes. Existing tunnel excavation simulation test devices usually select a section of pipe as the simulation Tunnel, however, this test model can only simulate the force condition of the tunnel under a certain excavation state. If you want to simulate the excavation progress of different nodes of the tunnel, you need to take another new section of pipe for simulation, so the reuse rate of the model Low, high material consumption, and poor flexibility;

[0005] 2. The tunnel will be affected by the surrounding soil gravity and extrusion force during the excavation process, which will cause a certain level of formation loss and deformation on the surface of the tunnel. The existing tunnel excavation simulation test device cannot perform geotechnical centrifugal tests. Adjust the radius of itself, it is not easy to simulate the formation loss after tunnel excavation, which will affect the accuracy of the results of geotechnical centrifugal test

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