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A visual test device and method for the impact of loading and unloading on rail transit

A technology of rail transit and test equipment, which is applied to measuring equipment, using stable tension/pressure to test the strength of materials, instruments, etc., can solve problems such as limited X-ray penetration and difficulty in using engineering model tests

Active Publication Date: 2021-02-12
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CT technology has attracted the attention of scholars at home and abroad because of its advantages of non-destructive, dynamic, and quantitative detection. It is mostly used to study the mesoscopic structure of soil and the evolution of stress. Difficult to use in engineering model tests

Method used

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  • A visual test device and method for the impact of loading and unloading on rail transit
  • A visual test device and method for the impact of loading and unloading on rail transit
  • A visual test device and method for the impact of loading and unloading on rail transit

Examples

Experimental program
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Effect test

Embodiment 1

[0038] see Figure 1 to Figure 7 , this embodiment discloses a visual test device for the influence of rail transit line operation on adjacent subway lines. The test device includes: a model box 1, a model soil 2, a rail transit model 3, a loading system 4, and a CT machine 5. The model soil 2 is filled in the model box 1, and the rail transit model 3 is placed in the model box 1 and covered by the model soil 2. Set the small iron ball 5.9 below the rail transit model 3. The loading system 4 is used to apply a top-down load to the model soil 2 . The CT machine 5 scans the model box 1, and recognizes the position change of the small iron ball 5.9 in the model soil 2 in the model box 1 under the action of the loading system 4, thereby analyzing the change of the internal displacement field of the soil and the settlement of the rail transit model 3 Variety.

[0039] The model box 1 is a model box 1 without a cover made of transparent plexiglass 1.1. The left side, right side, ...

Embodiment 2

[0058] A visual test device for the influence of loading and unloading on rail traffic, the structure is as follows Figure 1-3 , to study the impact of loading on the subway tunnel, including model box 1, model soil 2, rail transit model 3, loading system 4 and CT measurement system 5.

[0059] The model box 1 is made of plexiglass 1.1, with a thickness of 4-6 cm. On the opposite plexiglass 1.1, there are four "L"-shaped position marks 1.3, which are respectively located at the four corners and 5 cm from the edge, as a reference for settlement displacement. Model box 1 The internal size is 60-80cm in length, 40-60cm in width, and 50-70cm in height; transparent soil production: 15# white mineral oil and n-dodecane are mixed at a volume ratio of 2.5:1, and amorphous silica powder and the mixed solution are at a mass ratio of 1 :5 mixed, and then the mixture was degassed in a vacuum environment with a pressure of -0.1MPa for 3 to 4 hours, and then placed in a normal air pressure...

Embodiment 3

[0069] A visual test device for the influence of loading and unloading on rail traffic, the structure is as follows Figure 4 , to study the impact of loading on ground rail transit, including model box 1, model soil 2, rail transit model 3, loading system 4 and CT measurement system 5.

[0070] On the basis of Example 1, the cap slab subgrade model 3.2 is a model made of polycarbonate or other organic materials with a scale of 1:100. The model piles are rough, and the piles and the subgrade cap slab are connected by consolidation. The rest are the same as embodiment 1.

[0071] A method of using a visual test device for the impact of loading and unloading on rail traffic. On the basis of Example 1, in step (4), layer the transparent soil 2.1 into the model box 1 to the design position, and place the cap slab subgrade model 3.2 Insert it into the transparent soil 2.1, then put the train model 3.1 on the cap plate subgrade model 3.2, and fix it with AB glue. The rest are the ...

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Abstract

The invention discloses a visual test device and method for the impact of loading and unloading on rail traffic. The test device includes: model box, model soil, rail transit model, loading system and CT measurement system. The model soil is filled in the model box, and the rail transit model is placed in the model box and covered by the model soil; multiple iron balls are set in the model soil below the rail transit model; the loading system is used to apply top-down pressure to the model soil The load; the CT machine scans the model box to identify the position changes of the small iron balls in the model soil in the model box. The invention can more accurately simulate the impact of loading and unloading on the safe operation of adjacent rail transit, and can perform high-precision measurement of the interior of the soil, and can also study the impact of stacking and unloading on the safe operation of subway tunnels; the test operation is convenient and the cost is low.

Description

technical field [0001] The invention relates to the technical field of civil engineering, in particular to a visual test device and method for the influence of loading and unloading on rail traffic. Background technique [0002] With the rapid development of my country's economy, the level of urban construction has been rapidly improved, and the urban population is also increasing. In order to meet the needs of citizens for travel and tourism, the development of underground space has become an irresistible trend. In recent years, many subway lines have been built in many domestic cities to relieve traffic pressure. The government and developers have carried out commercial development along the subway lines. The new buildings along the lines and the operation of rail transit at stations will cause stratum movement and surface subsidence. Without protection, the horizontal displacement of the subway tunnel will occur, and even cracks will occur in the segment, which will affec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N23/046
CPCG01N3/08G01N23/046G01N2203/0256G01N2203/0647
Inventor 王长丹陈凯祥王炳龙周顺华李柱雄散骞骞周伟
Owner TONGJI UNIV
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