Precise preforming device and method for small-section tunnel in quantitative expansion and contraction model test

A model test and small cross-section technology, which is used in measurement devices, cross-section drawing, instruments, etc., can solve the problems of small support and adjustment devices, difficult to operate, and difficult to maintain the same size, and achieves the effect of ensuring convenience and standards.

Active Publication Date: 2022-07-29
SHANDONG UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, the inventors found that due to different application fields, when the device is applied to the formation of small-section tunnels, the support adjustment device installed in the middle of the small-section tunnel is too small to operate; in addition, it is difficult to maintain the size of the device section along the axial direction of the tunnel. Consistent, does not meet the geometric similarity requirements for tunnels
[0017] To sum up, none of the existing tunnel preforming devices can take into account the integrity of the section and the precise size of the section during the preforming process of the small-section tunnel, the quantitative synchronous expansion and contraction of the section, and the convenient section adjustment, which cannot meet the precise preforming requirements of the small-section tunnel in the model test.

Method used

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  • Precise preforming device and method for small-section tunnel in quantitative expansion and contraction model test
  • Precise preforming device and method for small-section tunnel in quantitative expansion and contraction model test
  • Precise preforming device and method for small-section tunnel in quantitative expansion and contraction model test

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Embodiment 1

[0053] This embodiment discloses a quantitative expansion and contraction model test small-section tunnel precise preforming device, such as Figure 1-Figure 2 As shown, it includes a support mechanism and an adjustment mechanism, the support mechanism is used to be arranged inside the similar material filled during the test to form a tunnel, and the adjustment mechanism can drive the expansion and contraction of the support mechanism.

[0054] In this embodiment, the support mechanism 1 is used to be arranged along the longitudinal direction of the tunnel, and adopts a cylindrical structure formed by a plurality of support plates that are plugged and connected in sequence and then closed into a ring and formed with open ends at both ends. The top of the tunnel is the top direction, the bottom is the bottom direction, and the two sides of the tunnel are the left and right directions, respectively.

[0055] According to the test requirements, this embodiment needs to open a tun...

Embodiment 2

[0084] This embodiment discloses the working method of the quantitative expansion and contraction model test small-section tunnel precise preforming device described in Embodiment 1, which includes the following steps:

[0085] Step 1: Lay a thin layer of bentonite at the bottom of the preset tunnel, and place a PTFE board with the same size as the bottom surface of the tunnel, because bentonite has strong adhesion, good plasticity, good demoulding, and air permeability It has good characteristics, and the PTFE plate has high lubricity, so the setting of the bentonite and the PTFE plate can ensure the convenient demoulding of the support mechanism and the integrity of the forming tunnel.

[0086] Step 2: Adjust the external size of the support mechanism to the set size of the preset tunnel through the adjusting rod, and place it on the PTFE plate at the preset tunnel position.

[0087] Step 3: Arrange PTFE plates with the same size as the left and right sides of the preset tun...

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Abstract

The invention relates to a quantitative expansion-contraction model test small-section tunnel precise preforming device and method, comprising: a support mechanism: used to be placed inside a test similar material, and the support mechanism is formed by connecting a plurality of support plates in turn with open ends at both ends. Cylindrical structure; adjustment mechanism: set inside the cylindrical structure and used to drive a plurality of support plates to move closer to or away from each other to shrink or expand the support mechanism. The device of the present invention is easy to operate and can accurately control the tunnel. Section size.

Description

technical field [0001] The invention relates to the technical field of test equipment, in particular to a device and method for precise preforming of small-section tunnels for quantitative expansion and contraction model tests. Background technique [0002] The statements herein merely provide background related to the present invention and do not necessarily constitute prior art. [0003] In mining engineering, geotechnical engineering, geological engineering, hydraulic engineering and other fields, tunnel stability and its supporting effect are very important subjects. It is one of the important research methods to establish a model structure similar in geometry to the tunnel prototype structure through model tests, and to deeply study the mechanical characteristics of the tunnel surrounding rock under the complex occurrence environment and external disturbance. [0004] Among them, some tunnel-related topics do not pay attention to the tunnel excavation process. In orde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C7/06
CPCG01C7/06
Inventor 张冰王汉鹏李梦天邢文彬王粟王鹏于欣平
Owner SHANDONG UNIV
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