A non-contact tunnel excavation physical model and test method capable of simulating rainfall

A non-contact technology for tunnel excavation, applied in soil material testing, material inspection, etc., can solve the problem of keeping the longitudinal axis of the tunnel straight and regular, the direction of wax melting is difficult to control, and the efficiency of wax melting method is low. problem, to achieve the effect of simple full-surface displacement and deformation field observation, simple and efficient test steps, and stable rainfall process

Active Publication Date: 2021-03-26
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The mechanical excavation method is mainly aimed at circular tunnels, and in many cases, the cylindrical excavation mechanism will have a certain restraint effect on the surrounding rock that has been excavated; the direct excavation method requires people to approach the test block to operate, which has a certain impact on instrument observation, and is relatively difficult. It is difficult to keep the longitudinal axis of the tunnel straight and the excavation section regular; the efficiency of the wax melting method is low, it takes a long time, and the direction of wax melting is not easy to control

Method used

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  • A non-contact tunnel excavation physical model and test method capable of simulating rainfall
  • A non-contact tunnel excavation physical model and test method capable of simulating rainfall
  • A non-contact tunnel excavation physical model and test method capable of simulating rainfall

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Embodiment 1

[0061] Such as figure 1 A non-contact tunnel excavation physical model that can simulate rainfall is shown, including tunnel excavation simulation device, controllable rainfall simulation device and test block full surface displacement field observation device, tunnel excavation simulation device It includes a soil body 18, a wax block 1 arranged in the soil body 18, and a long rod excavating mechanism adapted to the wax block 1.

[0062] The tunnel excavation simulation device is used to simulate the actual tunnel excavation process, the controllable rainfall simulation device is used to simulate different rainfall conditions, and the test block full surface displacement field observation device is used to observe the tunnel excavation process. Changes of the surrounding rock support system—soil 18 in the section excavation simulation device.

[0063] The wax block 1 is used to simulate the partial soil 18 of the tunnel to be excavated, and the wax block 1 is excavated by a ...

Embodiment 2

[0097] The operation process of the present invention is as follows:

[0098] Step 1: According to the test requirements, determine the depth of footage for each step of subsection excavation, and determine the thickness of the customized wax block layer;

[0099] The second step: melt the wax into a liquid, pour it into a container with a flat bottom surface, the depth of the wax liquid is the thickness of the determined wax block layer, and then cool;

[0100] Step 3: After the wax block layer is hardened to a slightly soft state, take it out and trim it according to the outer contour of the tunnel. After trimming, place it on a flat surface and press lightly with a flat heavy object to ensure that the front and back of the wax block layer remain flat and stacked The wax block layer forms the wax block 1 of vertical block;

[0101] The fourth step: filling the test block, when the filling reaches the excavation position of the tunnel, put the wax block 1 into the correspond...

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Abstract

The invention relates to a noncontact tunnel excavation physical model capable of simulating rainfall and a test method. The model comprises a tunnel segmented excavation simulation device, a controllable rainfall simulation device, and a test block full surface displacement field observation device. The test method comprises the steps of: 1) preparing a wax block layer and trimming and arranging the wax block layer to obtain wax blocks; 2) filling the soil and placing the wax blocks in the center of the soil; 3) constructing a test block full surface displacement field observation device and a controllable rainfall simulation device; 4) simulating the tunnel excavation by a long-rod excavation mechanism; 5) observing the soil displacement change by the test block full surface displacement field observation device. Compared with the prior art, the model improves the feasibility and authenticity of the tunnel segmented and stepped excavation process simulation, solves the control and stability of rainfall and rainfall modes in the rainfall simulation, and improves the accuracy of the observation analysis of the test block full surface displacement deformation field; the model can be used repeatedly, and has a wide application range and simple and efficient test steps.

Description

technical field [0001] The invention belongs to the technical field of physical model test methods, and relates to a non-contact tunnel excavation physical model capable of simulating rainfall and a test method. Background technique [0002] Physical model test is an important means to study tunnel science. At present, there is a mature and complete test system, including model test equipment, model materials, test loading methods and measurement techniques. It is a commonly used test in underground engineering. method. Because the physical model is a real physical entity, when it basically satisfies the similarity principle, it can avoid the difficulties in mathematics and mechanics, and truly, comprehensively, intuitively and accurately reflect the various aspects of the surrounding rock support system during tunnel excavation. Changes and influences in various aspects make it easier for people to fully grasp the overall mechanical characteristics, deformation trends and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 黄昕姚剑
Owner TONGJI UNIV
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