CN104674856A - Foundation pit excavation simulation device under supergravity condition - Google Patents
Foundation pit excavation simulation device under supergravity condition Download PDFInfo
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- CN104674856A CN104674856A CN201510059057.3A CN201510059057A CN104674856A CN 104674856 A CN104674856 A CN 104674856A CN 201510059057 A CN201510059057 A CN 201510059057A CN 104674856 A CN104674856 A CN 104674856A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Earth Drilling (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The invention discloses a foundation pit excavation simulation device under a supergravity condition. A model box is mounted in a rigid bracket; a camera and two main beams are arranged on the rigid bracket; main beam guide rails are arranged on the main beams; a main beam screw parallel to the main beam guide rails is mounted on one main beam and is connected with a main beam motor; two primary secondary beams are perpendicularly arranged on the two main beam guide rails to form a sliding pair; secondary beam guide rails are arranged on the secondary beams; a main beam side nut arranged in the main beam screw is connected with one of the primary secondary beams; one of the primary secondary beams is provided with a secondary beam screw parallel to the secondary beam guide rails; the secondary beam screw is connected with a secondary beam motor; two auxiliary secondary beams are perpendicularly arranged on the two secondary beam guide rails to form a sliding pair; an electric hoist is mounted in an electric hoist bracket on the two auxiliary secondary beams. The foundation pit excavation simulation device is suitable for foundation pit excavation of a foundation pit engineering supergravity model test under a non-stopping state; the stress on a soil body at the bottom of a pit is actually consistent with the pressure of the soil body side on a supporting and protecting structure.
Description
Technical field
The present invention relates to a kind of Base Pit Excavation Simulation device, particularly relate to the Base Pit Excavation Simulation device under a kind of hypergravity condition.
Background technology
Geotechnique's hypergravity model testing has its unique advantage relative to prototype measurement, indoor normal gravitational field test and method for numerical simulation, because of but carry out most advanced, the most effective test method in Geotechnical Engineering research at present.Along with the maximization, complicated of underground construction, the way in the past relying on engineering experience can not meet design, construction requirement, and carrying out base pit engineering centrifugal model test can study base pit engineering problem effectively, promote the perfect of the theoretical and numerical simulation of base pit engineering.Because base pit engineering operating mode is complicated, simulation difficulty, especially Base Pit Excavation Simulation, to the quality of actual condition simulation, will directly affect the result of test.
In existing hypergravity model testing, Pit Excavation Methods can be summarized as following several substantially:
(1) shut down excavation method, namely under stopped status, complete excavation, rear increase centrifugal acceleration studies the reaction of the soil body or soil-baffling structure in stress raising situation.But shut down the process of starting shooting and having unloading to reload to foundation soil, different from actual condition, resistance to shear of soil path changes, very important on the impact of model testing result.
(2) discharge is for native liquid excavation method, namely progressively discharge under centrifuge operating condition and carry out Simulation of Excavation Process for native liquid, generally under normal gravity condition, adopt the heavy-fluid suitable with soil body severe to replace the soil body of excavation of foundation pit part, be supplied to hole subsoil body vertical force and supporting and protection structure lateral force, but due to each equal to pressure in liquid same depth, the method can not the lateral pressure of the accurate simulation soil body.
(3) microrobot excavation method, namely adopts advanced miniature automatic excavating device to carry out excavation of foundation pit under centrifuge operating condition.Though the method is optimal Excavation simulation method, but development cost is high, technical difficulty is large.
Summary of the invention
The object of the present invention is to provide the Base Pit Excavation Simulation device under a kind of hypergravity condition, be particularly useful for hypergravity model testing under non-stopped status, the device of simulation foundation ditch fractional layer excavation.
The technical solution adopted for the present invention to solve the technical problems is as follows:
The present invention includes model casing, model casing is arranged in rigid support, rigid support upper surface arranges supervising device, rigid support upper surface is provided with two parallel girders, each own main beam guide track above two girders, wherein a girder side is provided with the girder screw rod parallel with main beam guide track, one end of girder screw rod is connected with the girder motor being arranged on wherein girder one end, the other end of girder screw rod is rotationally connected with the girder end plate dead eye being arranged on the same girder other end, two one-level secondary beams are arranged vertically on two main beam guide tracks, and form sliding pair with two main beam guide tracks, each own secondary beam guide rail above two one-level secondary beams, be contained in girder side nut in girder screw rod to be connected with a wherein one-level secondary beam, wherein an one-level time beam sides is provided with the secondary beam screw rod with secondary beam guide rail parallel, one end of secondary beam screw rod is connected with the secondary beam motor being arranged on wherein one-level secondary beam one end, the other end of secondary beam screw rod and the secondary beam end plate dead eye of the same one-level secondary beam other end are rotationally connected, two secondary secondary beams are arranged vertically on two secondary beam guide rails, and form sliding pair with two secondary beam guide rails, above two secondary secondary beams, bracket of electric hoist is housed, electric block is arranged in bracket of electric hoist.
Described model casing, comprises model storehouse and spoir storehouse, and the soil body is filled in model storehouse, and the soil body inserts space enclosing structure, model storehouse is divided into two parts, and be excavation of foundation pit part near spoir storehouse one upper lateral part, excavation of foundation pit part places several excavation earth bag.
Described space enclosing structure is division board or isolation pile.
Described several excavation earth bag top is equipped with ring spring, and ring spring can be sling by the suspension hook of electric block.
Described supervising device is camera, for monitoring the lift hook position with auxiliary adjustment electric block.
Described ring spring is upspring voluntarily after upper strata excavation earth bag recalls.
Described two one-level secondary beams form sliding pair by the first slide block and two main beam guide tracks, and two secondary secondary beams pass through the second slide block and two secondary beam guide rails form sliding pair, make the motion that the suspension hook of electric block realizes in horizontal direction.
Described first slide block is connected with girder screw rod by girder side nut, and described second slide block is connected with secondary beam screw rod by secondary beam side nut.
The size of described excavation earth bag coordinates with excavation layer, and material is canvas.
Described excavation of foundation pit part is provided with force snesor and displacement transducer, for measuring the corresponding internal force size and deformation size that the soil body generates because space enclosing structure produces internal forces distribution in Excavation Process thereupon.
The beneficial effect that the present invention has is:
(1) the present invention is applicable to the excavation of foundation pit of base pit engineering hypergravity model testing under non-stopped status.
(2) can ensure that suffered by hole subsoil body stress and supporting and protection structure, soil body lateral pressure is consistent with reality simultaneously.
(3) foundation ditch fractional layer excavation is simulated, consistent with practice of construction operating mode, meet the change of soil body true stress.
(4) whole principle of device is simple, and structure structure is clear, and be easy to install, cost is low.
Accompanying drawing explanation
Fig. 1 is top view of the present invention.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 is the B-B sectional view of Fig. 1.
In figure: 1, model casing; 2, rigid support; 3, camera; 4, girder; 5, main beam guide track; 6, the first slide block; 7, one-level secondary beam; 8, secondary beam guide rail; 9, the second slide block; 10, secondary secondary beam; 11, bracket of electric hoist; 12, electric block; 13, girder motor; 14, girder screw rod; 15, girder side nut; 16, secondary beam motor; 17, secondary beam screw rod; 18, secondary beam side nut; 19, girder end plate; 20, secondary beam end plate; 21, model storehouse; 22, spoir storehouse; 23, space enclosing structure; 24, earth bag is excavated; 25, ring spring; 26, suspension hook; 27, interior corner bolt.
Detailed description of the invention
Specific embodiment of the invention scheme is set forth further below in conjunction with accompanying drawing.
As shown in Figure 1, Figure 2, Figure 3 shows, be arranged on by model casing 1 in rigid support 2, rigid support 2 upper surface arranges camera 3, for monitoring suspension hook 26 position with auxiliary adjustment electric block 12, rigid support 2 upper surface is provided with two parallel girders 4, within respective above two girders 4, main beam guide track 5 fixed by corner bolt 27, wherein girder 4 side is provided with the girder screw rod 14 parallel with main beam guide track 5, one end of girder screw rod 14 is connected with the girder motor 13 being arranged on wherein girder 4 one end, the other end of girder screw rod 14 is rotationally connected with girder end plate 19 dead eye being arranged on same girder 4 other end, two one-level secondary beams 7 are arranged vertically on two main beam guide tracks 5, and form sliding pair by the first slide block 6 and two main beam guide tracks 5, within respective above two one-level secondary beams 7, secondary beam guide rail 8 fixed by corner bolt 27, be contained in girder side nut 15 in girder screw rod 14 to be connected with a wherein one-level secondary beam 7, wherein one-level secondary beam 7 side is provided with the secondary beam screw rod 17 parallel with secondary beam guide rail 8, one end of secondary beam screw rod 17 is connected with the secondary beam motor 16 being arranged on wherein one-level secondary beam 7 one end, the other end of secondary beam screw rod 17 and secondary beam end plate 20 dead eye of same one-level secondary beam 7 other end are rotationally connected, two secondary secondary beams 10 are arranged vertically on two secondary beam guide rails 8, and form sliding pair by the second slide block 9 and two secondary beam guide rails 8, two secondary secondary beams 10 are equipped with bracket of electric hoist 11 above, electric block 12 is arranged in bracket of electric hoist 11.
As shown in Figure 2, model casing 1 is divided into model storehouse 21 and spoir storehouse 22, and the soil body is filled in model storehouse 21, and the soil body inserts space enclosing structure 23, model storehouse 21 is divided into two parts, is excavation of foundation pit part near side, spoir storehouse.The excavation of foundation pit part soil body is replaced with several layers of excavation earth bag 24 in patternmaking process, every layer of earth bag is equipped with ring spring 25, and can upspring voluntarily after upper strata excavation earth bag 24 hangs out, therefore electric hoist suspension hook 26 can trigger ring spring 25 smoothly, hangs out excavation earth bag 24.The preparation method of described excavation earth bag 24 is first according to excavation layer size design earth bag, selects canvas to be make material, by making, to adopt afterwards and ground is prepared identical method and prepared and replace soil layer block.
Described space enclosing structure 23 is division board or isolation pile.
Described several excavation earth bag 24 top is equipped with ring spring 25, and ring spring 25 can be sling by the suspension hook 26 of electric block 12.
Operating principle of the present invention is as follows:
This device is arranged in centrifugal basket, open the girder motor 13 of girder 4 and the secondary beam motor 16 of one-level secondary beam 7 respectively, girder screw rod 14 and secondary beam screw rod 17 rotate, girder side nut 15 and secondary beam side nut 18 is caused to advance or retreat, and drive the first coupled slide block 6 and the second slide block 9 to move back and forth, thus realize suspension hook 26 motion in the horizontal direction of electric block 12, monitor suspension hook 26 position with camera 3, above the corresponding ring spring 25 of excavation earth bag 24 simultaneously; Close girder motor 13 and secondary beam motor 16, open electric block 12 switch, adjusting lift hook 26 moves up and down, certain altitude above lifting excavation earth bag 24 to model storehouse 21; Close electric block 12 switch, open girder motor 13 and secondary beam motor 16 respectively, the excavation earth bag 24 of lifting just moves to above spoir storehouse 22 with suspension hook 26; Close girder motor 13 and secondary beam motor 16, open electric block 12 switch, suspension hook 26 moves downward, and is positioned over by excavation earth bag 24 in spoir storehouse 22, and suspension hook 26 again rises and rises to above spoir storehouse 22, corresponding soil layer has excavated, the same step of excavation of other soil layer is carried out, until excavation of foundation pit completes, in Excavation Process, space enclosing structure 23 will produce internal forces distribution, foundation soil body is out of shape thereupon, measures relevant internal forces distribution by force snesor with displacement transducer.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. the Base Pit Excavation Simulation device under a hypergravity condition, it is characterized in that: comprise model casing (1), and model casing (1) is arranged in rigid support (2), rigid support (2) upper surface arranges supervising device, rigid support (2) upper surface is provided with two parallel girders (4), two girders (4) each own main beam guide track (5) above, wherein girder (4) side is provided with the girder screw rod (14) parallel with main beam guide track (5), one end of girder screw rod (14) is connected with the girder motor (13) being arranged on wherein girder (4) one end, the other end of girder screw rod (14) is rotationally connected with girder end plate (19) dead eye being arranged on same girder (4) other end, two one-level secondary beams (7) are arranged vertically on two main beam guide tracks (5), and form sliding pair with two main beam guide tracks (5), two one-level secondary beams (7) each own secondary beam guide rail (8) above, be contained in girder side nut (15) in girder screw rod (14) to be connected with a wherein one-level secondary beam (7), wherein one-level secondary beam (7) side is provided with the secondary beam screw rod (17) parallel with secondary beam guide rail (8), one end of secondary beam screw rod (17) is connected with the secondary beam motor (16) being arranged on wherein one-level secondary beam (7) one end, the other end of secondary beam screw rod (17) and secondary beam end plate (20) dead eye of same one-level secondary beam (7) other end are rotationally connected, two secondary secondary beams (10) are arranged vertically on two secondary beam guide rails (8), and form sliding pair with two secondary beam guide rails (8), two secondary secondary beams (10) are equipped with bracket of electric hoist (11) above, electric block (12) is arranged in bracket of electric hoist (11).
2. Base Pit Excavation Simulation device under a kind of hypergravity condition according to claim 1, it is characterized in that: described model casing (1), comprise model storehouse (21) and spoir storehouse (22), the soil body is filled in model storehouse (21), the soil body inserts space enclosing structure (23), model storehouse (21) are divided into two parts, close spoir storehouse one upper lateral part is excavation of foundation pit part, and excavation of foundation pit part places several excavation earth bag (24).
3. Base Pit Excavation Simulation device under a kind of hypergravity condition according to claim 1, is characterized in that: described space enclosing structure (23) is division board or isolation pile.
4. Base Pit Excavation Simulation device under a kind of hypergravity condition according to claim 1, it is characterized in that: described several excavation earth bag (24) top is equipped with ring spring (25), and ring spring (25) can be sling by the suspension hook of electric block (12) (26).
5. Base Pit Excavation Simulation device under a kind of hypergravity condition according to claim 1, is characterized in that: described supervising device is camera, for monitoring and suspension hook (26) position of auxiliary adjustment electric block (12).
6. Base Pit Excavation Simulation device under a kind of hypergravity condition according to claim 4, is characterized in that: described ring spring (25) is upspring voluntarily after upper strata excavation earth bag (24) recalls.
7. Base Pit Excavation Simulation device under a kind of hypergravity condition according to claim 1, it is characterized in that: described two one-level secondary beams (7) form sliding pair by the first slide block (6) and two main beam guide tracks (5), two secondary secondary beams (10) form sliding pair by the second slide block (9) and two secondary beam guide rails (8), make the motion that the suspension hook of electric block (12) (26) realizes in horizontal direction.
8. Base Pit Excavation Simulation device under a kind of hypergravity condition according to claim 7, it is characterized in that: described first slide block (6) is connected with girder screw rod (14) by girder side nut (15), described second slide block (9) is connected with secondary beam screw rod (17) by secondary beam side nut (18).
9. Base Pit Excavation Simulation device under a kind of hypergravity condition according to claim 2, is characterized in that: the size of described excavation earth bag (24) coordinates with excavation layer, and material is canvas.
10. Base Pit Excavation Simulation device under a kind of hypergravity condition according to claim 2, it is characterized in that: described excavation of foundation pit part is provided with force snesor and displacement transducer, for measuring the corresponding internal force size and deformation size that the soil body generates because space enclosing structure (23) produces internal forces distribution in Excavation Process thereupon.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510059057.3A CN104674856B (en) | 2015-02-04 | 2015-02-04 | Base Pit Excavation Simulation device when hypergravity |
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| CN201510059057.3A CN104674856B (en) | 2015-02-04 | 2015-02-04 | Base Pit Excavation Simulation device when hypergravity |
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| CN104674856B CN104674856B (en) | 2016-06-01 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105735381A (en) * | 2016-04-30 | 2016-07-06 | 山东大学 | Centrifugal model test system with composite foundation and supporting structure having common characters |
| CN105756107A (en) * | 2016-04-30 | 2016-07-13 | 山东大学 | Centrifugal test model for verifying combined action of supporting structure and soil body and manufacturing method of centrifugal test model |
| CN105756106A (en) * | 2016-04-30 | 2016-07-13 | 山东大学 | Centrifugal experiment model test system for simulating vertical load transmission mechanism of composite foundation |
| CN105926688A (en) * | 2016-04-30 | 2016-09-07 | 山东大学 | Centrifugal model testing device provided with composite foundation and support structure with common shape and property and manufacturing method of centrifugal model testing device |
| CN105926686A (en) * | 2016-04-30 | 2016-09-07 | 山东大学 | Centrifugal model testing system and method studying common character of composite foundation and support structure |
| CN109580368A (en) * | 2018-11-19 | 2019-04-05 | 同济大学 | Excavation Deformation of Deep Foundation Pits character centrifugal model test device in a kind of multilayer artesian water stratified formations |
| CN109958147A (en) * | 2019-03-26 | 2019-07-02 | 浙江大学 | It is a kind of to simulate asymmetric excavation pit to the hypergravity model test apparatus and method of lower sleeping tunnel influence |
| CN111206627A (en) * | 2020-03-02 | 2020-05-29 | 浙江大学城市学院 | Centrifugal model test device and method for influencing existing pile foundation by tunnel-foundation pit multiple excavation |
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| CN105735381A (en) * | 2016-04-30 | 2016-07-06 | 山东大学 | Centrifugal model test system with composite foundation and supporting structure having common characters |
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| CN105756106A (en) * | 2016-04-30 | 2016-07-13 | 山东大学 | Centrifugal experiment model test system for simulating vertical load transmission mechanism of composite foundation |
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| CN105926686A (en) * | 2016-04-30 | 2016-09-07 | 山东大学 | Centrifugal model testing system and method studying common character of composite foundation and support structure |
| CN109580368A (en) * | 2018-11-19 | 2019-04-05 | 同济大学 | Excavation Deformation of Deep Foundation Pits character centrifugal model test device in a kind of multilayer artesian water stratified formations |
| CN109958147A (en) * | 2019-03-26 | 2019-07-02 | 浙江大学 | It is a kind of to simulate asymmetric excavation pit to the hypergravity model test apparatus and method of lower sleeping tunnel influence |
| CN111206627A (en) * | 2020-03-02 | 2020-05-29 | 浙江大学城市学院 | Centrifugal model test device and method for influencing existing pile foundation by tunnel-foundation pit multiple excavation |
| CN111206627B (en) * | 2020-03-02 | 2024-03-08 | 浙江大学城市学院 | Centrifugal model test device and method for influencing existing pile foundation by tunnel-foundation pit multiple excavation |
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