CN210982436U - Slurry shield excavation surface stratum simulation device - Google Patents
Slurry shield excavation surface stratum simulation device Download PDFInfo
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- CN210982436U CN210982436U CN201921658033.XU CN201921658033U CN210982436U CN 210982436 U CN210982436 U CN 210982436U CN 201921658033 U CN201921658033 U CN 201921658033U CN 210982436 U CN210982436 U CN 210982436U
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Abstract
The utility model discloses a slurry shield excavation face stratum analogue means, including the transparent box that contains simulation stratum, its characterized in that: the filter is laid on the bottom plate of the transparent box body, a water outlet is formed in the bottom plate, a foam generator is connected to the side wall of the transparent box body through a foam inlet pipe, and a water inlet pipe is further connected to the side wall of the transparent box body. The utility model discloses earlier carry out the water saturation water treatment of turning over through the inlet tube with dry soil sample, then let in the foam through the foam generator to the simulation stratum and foam, improved the porosity on simulation stratum and reduced dry density, be applicable to the simulation on less dry density stratum.
Description
Technical Field
The utility model relates to a stratum analogue means belongs to tunnel shield technical field, specifically indicates a slurry shield excavation face stratum analogue means.
Background
With the continuous development of tunnel technology in China, the slurry shield technology is widely applied to the construction of urban subways, rivers crossing the river and submarine tunnels with the advantages of excellent pressure control mode, environmental protection, rapidness, low disturbance and the like. When the shield machine is used for tunneling, slurry needs to be injected into a stratum, a compact mud film is formed on the surface of the excavation surface, and the mud-water pressure acts on the mud film to balance the cement-water pressure in the stratum, so that the stability of the excavation surface is kept. Therefore, the construction has high requirements on the quality of the mud film, and the permeability coefficient is an important index for evaluating the quality of the mud film.
In order to measure the permeability coefficient of a mud membrane, a film formation simulation test of mud on a stratum is needed, the structure of the stratum is easy to damage due to stratum collection, and the single collection amount is small and can only meet the requirement of one test, so that a real stratum needs to be simulated, and the stratum simulation mainly refers to the data of the dry density, the compaction degree, the permeability coefficient, the porosity and the like of the stratum, particularly the data of the dry density, reflects the compaction degree of the stratum to a certain extent and directly influences the permeability coefficient and the porosity of the stratum.
Chinese patent CN207470190U discloses a device for simulating slurry film formation of slurry shield excavation face and measuring permeability coefficient of slurry film. In the device, a soil layer is simulated by the geotextile with the same porosity as the stratum, so that the slurry forms a film on the geotextile, but the compactness, the dry density and the stratum grain size grading of the geotextile cannot really simulate the stratum. In addition, manual or machine compaction methods are typically used for formation modeling with greater dry densities, but are not readily available for modeling with lesser dry densities.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects existing in the prior art and providing a simulation device for simulating a smaller dry density stratum.
In order to achieve the above object, the utility model provides a slurry shield excavation face stratum analogue means, including the transparent box who contains simulation stratum, its characterized in that: the filter is laid on the bottom plate of the transparent box body, a water outlet is formed in the bottom plate, a foam generator is connected to the side wall of the transparent box body through a foam inlet pipe, and a water inlet pipe is further connected to the side wall of the transparent box body.
Furthermore, the upper end and the lower end of the transparent box body are provided with openings, and the upper end and the lower end of the transparent box body are fixed with the sealing baffle through clamps.
Further, the foam generator is respectively connected with a foam liquid inlet pipe and an air inlet pipe.
Furthermore, a water inlet valve is arranged on the water inlet pipe, and a foam inlet valve and a foam filter screen are arranged on the foam inlet pipe.
Furthermore, the water inlet pipe with advance the foam pipe and be a plurality of, it is a plurality of water inlet pipe and advance the foam pipe and arrange along transparent box direction of height.
The utility model has the advantages that: a less dry density formation is simulated. The utility model discloses earlier carry out the water saturation water treatment of turning over through the inlet tube with dry soil sample, then let in the foam through the foam generator to the simulation stratum and foam, improved the porosity on simulation stratum and reduced dry density, be applicable to the simulation on less dry density stratum.
Drawings
Fig. 1 is a front view of the structure of the stratum simulator of the present invention.
The components in the figures are numbered as follows: the device comprises a transparent box body 1, a sealing baffle 101, a clamp 102, volume scale marks 103, a simulated stratum 2, a filter layer 3, a water outlet 4, a water inlet pipe 5, a water inlet valve 6, a foam inlet pipe 7, a foam inlet valve 8, a foam filter screen 9, a foam generator 10, a foam inlet pipe 11 and an air inlet pipe 12.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, which are not intended to limit the scope of the present invention.
As shown in fig. 1, the muddy water shield excavation surface stratum simulation device comprises a transparent box body 1 filled with a simulation stratum 2, wherein the upper end and the lower end of the transparent box body 1 are provided with openings, and the upper end and the lower end of the transparent box body 1 are fixed with a sealing baffle 101 through a clamp 102; the bottom plate upper berth of transparent box 1 is equipped with filter layer 3 and opens there is outlet 4, is connected with foam generator 10 through advancing foam pipe 7 on the transparent box 1 lateral wall, advances foam valve 8 and foam filter screen 9 on advancing foam pipe 7, and foam generator 12 is connected with into foam liquid pipe 11 and intake pipe 12 respectively, still is connected with inlet tube 5 on the transparent box 1 lateral wall, is equipped with water intaking valve 6 on the inlet tube 5.
In the above technical solution, the transparent box 1 has the volume scale mark 103 on the sidewall thereof, which can display the volume of the simulated formation, thereby controlling the dry density thereof.
In the above technical scheme, the water inlet pipe 5 and the foam inlet pipe 7 are multiple, and the multiple water inlet pipes 5 and the foam inlet pipes 7 are arranged along the height direction of the transparent box body. This may allow for more complete and uniform reverse saturation and foaming of the simulated formation.
The utility model discloses a stratum analogue means simulation process as follows: calculating the mass and volume of a required simulated stratum according to the dry density of the stratum, selecting dry soil samples with various particle sizes as the simulated stratum, firstly opening a water inlet valve and closing a foam inlet valve, carrying out water-reversing saturation treatment on the dry soil samples through a water inlet pipe, closing the water inlet valve when water completely covers the soil samples, and opening a water outlet after waiting for 5-10 min to discharge redundant water until the upper surface of the soil samples is anhydrous; and then opening a foam inlet valve, fully mixing foam liquid and air in a foam generator to form compact foam, allowing the foam to pass through a filter screen and enter a soil sample for expansion, determining the size of the foam liquid by the size of pores of the filter screen so as to determine the size of pores inside the stratum, closing the foam inlet valve after the soil sample expands to a preset volume, and accurately simulating the parameters of dry density, compactness, porosity, permeability coefficient and the like of the stratum by the soil sample at the moment, namely restoring the real condition of the stratum, thereby being beneficial to the development of a subsequent mud film test.
Claims (5)
1. The utility model provides a muddy water shield excavation face stratum analogue means, includes transparent box (1) of interior filling simulation stratum (2), its characterized in that: the bottom plate upper berth of transparent box (1) is equipped with filter layer (3) and opens there is outlet (4), be connected with foam generator (10) through advancing foam pipe (7) on transparent box (1) lateral wall, still be connected with inlet tube (5) on transparent box (1) lateral wall.
2. The slurry shield excavation face stratum simulation device of claim 1, characterized in that: the upper end and the lower end of the transparent box body (1) are provided with openings, and the upper end and the lower end of the transparent box body (1) are fixed with the sealing baffle (101) through the clamp (102).
3. The slurry shield excavation face stratum simulation device of claim 2, characterized in that: the foam generator (10) is respectively connected with a foam liquid inlet pipe (11) and an air inlet pipe (12).
4. The slurry shield excavation face stratum simulation device of claim 3, characterized in that: the water inlet pipe (5) is provided with a water inlet valve (6), and the foam inlet pipe (7) is provided with a foam inlet valve (8) and a foam filter screen (9).
5. The slurry shield excavation face stratum simulation device of claim 4, characterized in that: the inlet tube (5) with advance foam pipe (7) and be a plurality of, it is a plurality of inlet tube (5) with advance foam pipe (7) and arrange along transparent box direction of height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921658033.XU CN210982436U (en) | 2019-09-30 | 2019-09-30 | Slurry shield excavation surface stratum simulation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921658033.XU CN210982436U (en) | 2019-09-30 | 2019-09-30 | Slurry shield excavation surface stratum simulation device |
Publications (1)
| Publication Number | Publication Date |
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| CN210982436U true CN210982436U (en) | 2020-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921658033.XU Active CN210982436U (en) | 2019-09-30 | 2019-09-30 | Slurry shield excavation surface stratum simulation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114878789A (en) * | 2022-07-13 | 2022-08-09 | 成都理工大学 | Rainfall type landslide instability test device based on seepage and macroscopic damage coupling analysis |
-
2019
- 2019-09-30 CN CN201921658033.XU patent/CN210982436U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114878789A (en) * | 2022-07-13 | 2022-08-09 | 成都理工大学 | Rainfall type landslide instability test device based on seepage and macroscopic damage coupling analysis |
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