CN114880860B - Impact dismantling method for foundation pit excavation rock-soil centrifuge test support - Google Patents
Impact dismantling method for foundation pit excavation rock-soil centrifuge test support Download PDFInfo
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- CN114880860B CN114880860B CN202210534370.8A CN202210534370A CN114880860B CN 114880860 B CN114880860 B CN 114880860B CN 202210534370 A CN202210534370 A CN 202210534370A CN 114880860 B CN114880860 B CN 114880860B
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- 239000002689 soil Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000009412 basement excavation Methods 0.000 title claims abstract description 15
- 239000005341 toughened glass Substances 0.000 claims abstract description 28
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 19
- 239000010440 gypsum Substances 0.000 claims abstract description 19
- 239000002184 metal Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 238000010146 3D printing Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims 1
- 238000004088 simulation Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/02—Reliability analysis or reliability optimisation; Failure analysis, e.g. worst case scenario performance, failure mode and effects analysis [FMEA]
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a method for removing a support impact in a foundation pit excavation rock-soil centrifuge test, which comprises the following steps: 1) Manufacturing a plastic model of a supporting system; 2) Manufacturing a gypsum mold; 3) Manufacturing a toughened glass supporting system; 4) Installing a toughened glass supporting system in a foundation pit model of a rock-soil centrifuge test; the top of the model box is provided with a dismantling device, the dismantling device comprises a striking device and a two-dimensional translation device thereof, and the striking device comprises a driving motor and a metal striking pestle; after the preparation is finished, starting a centrifuge test; 5) And removing the toughened glass supporting system in the running process of the centrifugal machine, firstly starting the two-dimensional translation device to move the impact device to the upper part of the horizontal support, and then starting the impact device to sequentially impact the horizontal support from top to bottom so as to realize the removal of the horizontal support. The invention not only can achieve the effect of dismantling the support, but also can save the space of the centrifugal machine model to be reserved for the simulation prototype, thereby improving the utilization rate of the model space.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering centrifuge model tests, in particular to a method for removing a support impact in a foundation pit excavation geotechnical centrifuge test.
Background
The geotechnical centrifuge test is a test method for simulating geotechnical engineering construction live under a prototype size by setting specific gravity acceleration, and is widely applied to various fields such as soil mechanics, geotechnical engineering and the like. However, the existing rock-soil centrifuge test for simulating foundation pit excavation has two main problems, namely, the cost is limited by the expensive cost of the centrifuge, the space for the model test in the centrifuge is small, and the size of a prototype which can be simulated under the allowable maximum gravitational acceleration is limited. Secondly, in the foundation pit support setting process, hydraulic devices and the like are usually required to control the movement of the support, and because the hydraulic devices are relatively large, the hydraulic devices occupy additional model test space, and the maximum value of the prototype size is further limited.
Disclosure of Invention
The invention provides a method for removing the support impact in a foundation pit excavation rock-soil centrifuge test, which aims to solve the technical problems in the prior art, and can remarkably improve the utilization rate of a model space.
The invention adopts the technical proposal for solving the technical problems in the prior art that: a method for removing a support in a foundation pit excavation rock-soil centrifuge test by impact comprises the following steps:
1) Drawing a three-dimensional model of a foundation pit horizontal support system by adopting CAD software, arranging a connecting plate at one end of the model to enable a plurality of horizontal supports to form an integral structure, and then manufacturing a support system plastic model by adopting a 3D printing technology;
2) Placing the support system plastic model into gypsum slurry to be formed in a direction of horizontally supporting downwards and connecting plates upwards, standing until gypsum is formed, and taking out the support system plastic model to obtain a gypsum mold;
3) Manufacturing a toughened glass supporting system by using a gypsum mold;
4) Installing a toughened glass supporting system in a foundation pit model of a rock-soil centrifuge test, connecting a connecting plate with the side wall of a model box, and connecting a horizontal support with a ground connecting wall; the top of the model box is provided with a dismantling device, the dismantling device comprises a striking device and a two-dimensional translation device for driving the striking device, the striking device comprises a driving motor and a metal striking pestle, the output end of the driving motor faces downwards and is connected with the metal striking pestle, and the two-dimensional translation device is connected with the top opening of the model box and is driven by the translation motor; after filling the soil bodies inside and outside the foundation pit to a preset height and preparing each test device, starting a centrifuge test;
5) When the toughened glass supporting system is dismantled in the running process of the centrifugal machine, the two-dimensional translation device is started to move the impact device to the position above the horizontal support, and then the impact device is started to impact the horizontal support from top to bottom in sequence, so that the horizontal support is dismantled.
And step 4), the impact driving motor is connected with the two-dimensional translation device through a mounting seat, and a motor deflection adjusting structure and/or a motor inclination adjusting structure are arranged on the mounting seat.
Step 4), two-dimensional translation device is equipped with perpendicular sliding connection's X to track and Y to track, and the mount pad is connected in X to the orbital intersection of track and Y to the track, X to track and Y to track respectively with fixed track sliding connection, X to track and Y to the track respectively by a translation motor drive, the translation motor is installed on the model box, and fixed track installs the oral area at the model box.
And 4) the lower end of the impacting pestle adopts a cone structure.
The invention has the advantages and positive effects that: through adopting the horizontal support system and the motor drive who makes of toughened glass demolish the device, control the displacement of metal striking pestle through the motor to realize the accurate striking destruction to toughened glass horizontal support, reach the effect of demolishing the support, demolish through adopting motor drive to carry out horizontal support simultaneously, compare the demolishing that adopts hydraulic control, demolish the device and occupy model test space little, can save centrifuge model space, reserve for the simulation prototype use, and then improve the utilization ratio in model space. The die disclosed by the invention can be repeatedly utilized, and the test method is simple and convenient, good in economy, strong in universality and high in accuracy, has good economic benefit and scientific research value, and can be widely popularized and applied.
Drawings
FIG. 1 is an elevation view of an application of the present invention;
FIG. 2 is a side cross-sectional view of FIG. 1;
FIG. 3 is a plan view of FIG. 1;
FIG. 4 is a schematic diagram of a tempered glass support architecture employed in the present invention;
fig. 5 is a schematic view of a demolition arrangement according to the invention.
In the figure: 1. a metal impact pestle; 2. a horizontal support; 3. a ground connecting wall; 4. model soil body; 5. a model box; 6. a connecting plate; 7. an X-direction track; 8. a fixed rail; 9. a Y-direction track; 10. and driving the motor.
Detailed Description
For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:
Referring to fig. 1 to 5, a method for removing a support impact in a foundation pit excavation rock-soil centrifuge test comprises the following steps:
1) And drawing a three-dimensional model of the foundation pit horizontal support system by adopting CAD software, arranging a connecting plate at one end of the model to enable a plurality of horizontal supports to form an integral structure, and then manufacturing a plastic model of the support system by adopting a 3D printing technology.
2) Placing the support system plastic model into gypsum slurry to be formed in a direction of horizontally supporting downwards and connecting plates upwards, standing until gypsum is formed, and taking out the support system plastic model to obtain a gypsum mold; the toughened glass supporting system can be produced in batches by adopting the gypsum mold.
3) And manufacturing a toughened glass supporting system by using a gypsum mold, pouring melted toughened glass into the gypsum mold, and rapidly cooling to form the toughened glass supporting system after the mold is just filled, so as to be used for a rock-soil centrifuge test.
4) The toughened glass supporting system is arranged in a foundation pit model of a rock-soil centrifuge test, a connecting plate 6 is connected with the side wall of a model box 5, and a horizontal support 2 is connected with a diaphragm wall 3. Specifically, a toughened glass supporting system is installed in a foundation pit model of a rock-soil centrifuge test by using 502 glue, a connecting plate is adhered to a box body, and a horizontal support is clung to a ground connecting wall.
The top of the model box 5 is provided with a dismantling device, the dismantling device comprises a striking device and a two-dimensional translation device for driving the striking device, the striking device comprises a driving motor 10 and a metal striking pestle 1, the output end of the driving motor 10 faces downwards and is connected with the metal striking pestle 1, the two-dimensional translation device is connected with the top opening of the model box 5, and the two-dimensional translation device is driven by the translation motor.
And after the soil body 4 of the inner and outer models of the foundation pit is filled to a preset height and each test device is prepared, starting a centrifugal machine test.
5) When the toughened glass supporting system is dismantled in the running process of the centrifugal machine, the two-dimensional translation device is started to move the impact device to the position above the horizontal support 2, and then the impact device is started to impact the horizontal support 2 from top to bottom in sequence, so that the horizontal support 2 is dismantled.
Through adopting the horizontal support system and the motor drive who makes of toughened glass demolish the device, control the displacement of metal striking pestle through the motor to realize the accurate striking destruction to toughened glass horizontal support, reach the simulation and demolish the effect of supporting, demolish through adopting motor drive to carry out horizontal support simultaneously, compare and adopt hydraulic control demolish, demolish the device and occupy model test space little, the size of reserving for the simulation prototype is big, can improve the utilization ratio in model test space.
In this embodiment, in order to better complete the test, realize the accurate control to metal striking pestle 1 striking toughened glass horizontal support 2 quantity and order, step 4), driving motor 10 is connected with two-dimensional translation device through the mount pad, is equipped with motor deflection adjustment structure and/or motor tilt adjustment structure on the mount pad for the inclination and the deflection angle of adjustment motor. In order to realize quick dismantling of the horizontal support, the lower end of the impacting pestle 1 adopts a cone structure. However, the above structure is illustrative, and the shape and direction of the metal impact pestle 1 are adjustable so as to realize precise control of the number and sequence of horizontal supports. In this embodiment, the two-dimensional translation device is provided with an X-direction track 7 and a Y-direction track 9 which are vertically and slidably connected, the mounting seat is connected to the junction of the X-direction track 7 and the Y-direction track 9, the X-direction track 7 and the Y-direction track 9 are respectively and slidably connected with the fixed track 8, the X-direction track 7 and the Y-direction track 9 are respectively driven by a translation motor, the translation motor is mounted on the model box 5, and the fixed track 8 is mounted at the mouth of the model box 5.
With reference to fig. 1 to 5, the length of the model box is 770mm, the width of the model box is 350mm, the excavation depth of the foundation pit is 160mm, the earth penetration depth of the underground diaphragm wall is 240mm based on the height of soil outside the foundation pit, the two support depths are 20mm and 100mm respectively, the support length is 120mm, and the support distance is 175mm. The process for carrying out impact dismantling on the foundation pit excavation rock-soil centrifuge test support by adopting the method comprises the following steps of:
and 1, drawing a three-dimensional model of a foundation pit supporting system by using CAD software, arranging 5mm thick connecting plates at the outer sides of four horizontal supports with the length of 115mm, so that a plurality of supports form an integral structure, and then producing a plastic model of the supporting system by using a 3D printing technology.
And 2, placing the support system plastic model into gypsum slurry to be formed in a direction of horizontally supporting downwards and connecting plates upwards, standing for a period of time, taking out the support system plastic model after gypsum is formed, and using the formed gypsum as a mould for subsequent mass production of toughened glass support systems.
And 3, pouring melted toughened glass into the gypsum mold, and rapidly cooling the mold and the melted toughened glass after the mold is completely filled with the hollow, so as to prepare a required toughened glass supporting system for a subsequent pit excavation rock-soil centrifuge test.
And 4, installing a toughened glass supporting system in the foundation pit model of the rock-soil centrifuge test by using 502 glue, adhering the side of the connecting plate to the box body, tightly adhering the supporting side to the ground connecting wall, and starting the centrifuge test after the soil body inside and outside the foundation pit is filled to a preset height and all equipment of the model are ready.
And 5, supporting and dismantling the centrifuge in the running process, when the support is dismantled, moving the impact device to the upper part of the horizontal support by controlling the translation motor, and then controlling the metal impact pestle to sequentially impact the toughened glass horizontal support by controlling the driving motor so as to realize the support dismantling.
The method for removing the support impact in the foundation pit excavation rock-soil centrifuge test is suitable for tests with relatively limited prototype sizes and higher space utilization rate requirements of the centrifuge test, has lower cost, and can be used for multiple times. The test method can accurately simulate the foundation pit support dismantling process in actual engineering, and has good use and popularization values.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the appended claims, which are within the scope of the present invention.
Claims (4)
1. The method for removing the support impact in the foundation pit excavation rock-soil centrifuge test is characterized by comprising the following steps of:
1) Drawing a three-dimensional model of a foundation pit horizontal support system by adopting CAD software, arranging a connecting plate at one end of the model to enable a plurality of horizontal supports to form an integral structure, and then manufacturing a support system plastic model by adopting a 3D printing technology;
2) Placing the support system plastic model into gypsum slurry to be formed in a direction of horizontally supporting downwards and connecting plates upwards, standing until gypsum is formed, and taking out the support system plastic model to obtain a gypsum mold;
3) Manufacturing a toughened glass supporting system by using a gypsum mold;
4) Installing a toughened glass supporting system in a foundation pit model of a rock-soil centrifuge test, connecting a connecting plate with the side wall of a model box, and connecting a horizontal support with a ground connecting wall; the top of the model box is provided with a dismantling device, the dismantling device comprises a striking device and a translation device for driving the striking device, the striking device comprises a driving motor and a metal striking pestle, the output end of the driving motor faces downwards and is connected with the metal striking pestle, and the translation device is connected with the top opening of the model box and is driven by the translation motor; after filling the soil bodies inside and outside the foundation pit to a preset height and preparing each test device, starting a centrifuge test;
5) When the toughened glass supporting system is dismantled in the running process of the centrifugal machine, firstly, the translation device is started to move the impact device to the position above the horizontal support, and then the impact device is started to impact the horizontal support from top to bottom in sequence, so that the horizontal support is dismantled.
2. The method for demolishing the test support of the foundation pit excavation geotechnical centrifuge according to claim 1, wherein in the step 4), an impact driving motor is connected with a translation device through a mounting seat, and a motor deflection adjusting structure and/or a motor inclination adjusting structure are arranged on the mounting seat.
3. The method for impact dismantling of the foundation pit excavation rock-soil centrifuge test support according to claim 2, wherein the step 4) is characterized in that the translation device is provided with an X-direction track and a Y-direction track which are vertically connected in a sliding manner, the installation seat is connected to the intersection of the X-direction track and the Y-direction track, the X-direction track and the Y-direction track are respectively connected with the fixed track in a sliding manner, the X-direction track and the Y-direction track are respectively driven by a translation motor, the translation motor is installed on the model box, and the fixed track is installed at the mouth of the model box.
4. The method for demolishing a support for a test of a foundation pit excavated geotechnical centrifuge according to claim 1, wherein in the step 4), a cone structure is adopted at the lower end of the impact pestle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210534370.8A CN114880860B (en) | 2022-05-17 | 2022-05-17 | Impact dismantling method for foundation pit excavation rock-soil centrifuge test support |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210534370.8A CN114880860B (en) | 2022-05-17 | 2022-05-17 | Impact dismantling method for foundation pit excavation rock-soil centrifuge test support |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2085170A1 (en) * | 2008-01-31 | 2009-08-05 | Corimag S.r.l. | Crushing apparatus for demolition or similar works |
| CN106645640A (en) * | 2016-12-07 | 2017-05-10 | 同济大学 | Testing device and method of foundation pit excavation rock soil centrifuge |
| WO2021008278A1 (en) * | 2019-07-12 | 2021-01-21 | 河南理工大学 | High-speed railway goaf foundation pseudo-dynamic loading model test apparatus and method |
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2022
- 2022-05-17 CN CN202210534370.8A patent/CN114880860B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2085170A1 (en) * | 2008-01-31 | 2009-08-05 | Corimag S.r.l. | Crushing apparatus for demolition or similar works |
| CN106645640A (en) * | 2016-12-07 | 2017-05-10 | 同济大学 | Testing device and method of foundation pit excavation rock soil centrifuge |
| WO2021008278A1 (en) * | 2019-07-12 | 2021-01-21 | 河南理工大学 | High-speed railway goaf foundation pseudo-dynamic loading model test apparatus and method |
Non-Patent Citations (1)
| Title |
|---|
| 具有多道支撑的深基坑开挖离心模拟试验方法;冉光斌;宁张伟;洪建忠;谢雄耀;王新伦;;地下空间与工程学报;20101215(第06期);全文 * |
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