CN214940484U - Simulation device for influence of dynamic compaction process on pile foundation - Google Patents
Simulation device for influence of dynamic compaction process on pile foundation Download PDFInfo
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- CN214940484U CN214940484U CN202120918986.6U CN202120918986U CN214940484U CN 214940484 U CN214940484 U CN 214940484U CN 202120918986 U CN202120918986 U CN 202120918986U CN 214940484 U CN214940484 U CN 214940484U
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Abstract
The utility model discloses a simulator of dynamic compaction process to pile foundation influence, include: the dynamic compaction device comprises a model box, a dynamic compaction device, a slide rail device and a pile foundation model; uniformly paving a soil body model in the model box; the slide rail device comprises a first slide rail, and the first slide rail is arranged on the upper end surface of the model box; the dynamic compaction device comprises a rolling shaft, a pull rope and a rammer; the dynamic compaction device is arranged below the first sliding rail and can horizontally move on the first sliding rail; the rolling shaft, the pull rope and the rammer are sequentially connected, and the soil body model is dynamically rammed when the rolling shaft falls freely; the pile foundation model is installed in the model box, and the upper end part of the pile foundation model extends out of the soil body model; the cross section of the pile foundation model is semicircular, and the cross section of the pile foundation model along the axis of the pile body is tightly attached to one inner wall of the model box; and a sensing device for measuring the displacement change of the pile foundation and the stress condition of the pile body is arranged on the pile foundation model. The utility model discloses can carry out effective simulation to dynamic compaction operation during the work progress.
Description
Technical Field
The utility model relates to a civil model test device, specifically, relate to a analogue means of dynamic compaction process to pile foundation influence.
Background
The dynamic compaction method is a common foundation treatment method and is widely applied to foundation reinforcement projects such as highways, railways, airports, nuclear power stations, large industrial areas and the like. The dynamic compactor is used as an impact type vibration source, strong shock waves can be generated at the moment when the rammer falls to the ground, and when the ground surface vibration intensity in a certain range around a ramming point reaches a certain numerical value, the ground surface and surrounding buildings can resonate, so that the ground surface and surrounding buildings are damaged to different degrees; meanwhile, the intensity of ground vibration is higher due to continuous tamping, so that the dynamic compaction vibration has higher potential hazard to the surrounding environment. The pile foundation is a common foundation form of a building, so that the dynamic compaction vibration has certain adverse effect on the surrounding pile foundation. Therefore, the method realizes effective simulation of the influence of the dynamic compaction on the existing pile foundations at the periphery, predicts the adverse influence of the dynamic compaction on the existing pile foundations at the periphery, and becomes a technical key point for making a construction scheme and avoiding serious harm.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a simulator of dynamic compaction process to pile foundation influence, can carry out effective simulation to dynamic compaction operation during the work progress to this reaction dynamic compaction has had influences such as displacement, deformation that the pile foundation of different distances produced to the periphery, and the principle is clear and definite, builds simply, the test process is easily observed.
The utility model adopts the following technical scheme:
on the one hand, a analogue means of dynamic compaction process to pile foundation influence includes: the dynamic compaction device comprises a model box, a dynamic compaction device, a slide rail device and a pile foundation model;
soil body models are uniformly paved in the model boxes;
the slide rail device comprises a first slide rail, and the first slide rail is arranged on the upper end surface of the model box;
the dynamic compaction device comprises a rolling shaft, a pull rope and a rammer; the dynamic compaction device is arranged below the first sliding rail and can horizontally move on the first sliding rail; the rolling shaft, the pull rope and the rammer are sequentially connected, and the soil body model is dynamically rammed when the rolling shaft falls freely;
the pile foundation model is installed in the model box, and the upper end part of the pile foundation model extends out of the soil body model; the cross section of the pile foundation model is semicircular, and the cross section of the pile foundation model along the axis of the pile body is tightly attached to one inner wall of the model box; and the pile foundation model is provided with a sensing device for measuring the displacement change of the pile foundation and the stress condition of the pile body.
Preferably, the slide rail device further comprises a second slide rail and a third slide rail; four corners of the top of the model box are respectively and vertically provided with a bracket; the second slide rail is arranged above two adjacent brackets, the third slide rail is arranged above the other two brackets, and the second slide rail and the third slide rail are arranged in parallel; the two ends of the first slide rail are respectively connected with the second slide rail and the third slide rail, and the first slide rail can slide on the second slide rail and the third slide rail.
Preferably, the four brackets and the model box are connected through angle steel.
Preferably, the sensing device comprises a displacement sensor and a strain gauge; the displacement sensor is arranged on the top surface of the pile foundation model; the strain gauge is arranged on the surface of the pile foundation model.
Preferably, one of the four side surfaces of the model box is provided with a transparent toughened glass baffle; the cross-section of pile foundation model along pile shaft axis with transparent toughened glass baffle inner wall closely laminates to effectively reduce the friction between pile foundation model and the baffle contact surface through vacuum silicone grease.
Preferably, the simulation apparatus further comprises a camera; the camera device is arranged in front of the transparent toughened glass baffle to shoot the dynamic compaction process.
Preferably, the other three sides of the four sides of the model box are all made of steel plates.
Preferably, the pull rope and the rammer are connected through a hook so as to replace the rammer.
Preferably, the model box is divided into two areas, one area is a dynamic compaction area, and the dynamic compaction device is arranged above the dynamic compaction area to simulate the dynamic compaction construction process; and the other area is provided with the pile foundation model.
On the other hand, the simulation method of the influence of the dynamic compaction process on the pile foundation is based on the simulation device of the influence of the dynamic compaction process on the pile foundation, and comprises the following steps:
uniformly paving a soil model in the soil model, and installing the pile foundation model in the model box;
the dynamic compaction device is moved to a designated position through a sliding rail device, and the free fall of the rammer is controlled to dynamically compact the soil body, so that the dynamic compaction operation during construction is simulated;
observing the deformation of the pile foundation model, collecting data of pile foundation displacement change and pile body stress condition output by the sensing device, and analyzing the influence of dynamic compaction operation on the existing pile foundation;
and replacing the rammers with different diameters and/or weights, adjusting the heights of the rammers, and repeating the steps.
Compared with the prior art, the beneficial effects of the utility model are as follows:
(1) the utility model discloses can carry out effective simulation to dynamic compaction operation during the work progress, specifically for installing soil phantom, pile foundation model in the model case, make the dynamic compaction device can move on the plane through the slide rail device, the ram free fall carries out the dynamic compaction to the soil body model to this dynamic compaction operation when simulating the work progress, then through the change to the pile foundation model study the dynamic compaction has the influence such as displacement, deformation that the pile foundation of different distances produced to the periphery, and the principle is clear and definite, build simply, the test process is easily observed;
(2) one side (front side) of the model is provided with a transparent toughened glass baffle, so that the simulation dynamic compaction process can be observed conveniently, a photographic device (such as a digital camera) can capture the deformation of the pile foundation model, and an image analysis technology is adopted for microscopic mechanism analysis, the influence of the dynamic compaction construction process on the existing pile foundation is further analyzed, and a reasonable dynamic compaction construction scheme is formulated;
(3) the slide rail device of the utility model can drive the dynamic compaction device to move in the plane, and adjust the position of the dynamic compaction device above the dynamic compaction area, so as to observe the influence of multi-point dynamic compaction on the pile foundation;
(4) the roller of the utility model can adjust the height of the rope, realize the height regulation of the rammer and simulate different ramming energies;
(5) the utility model discloses a pile foundation model can be arranged in from dynamic compaction district apart from different positions, the contrast pile foundation model of being convenient for apart from the influence of dynamic compaction district different distances.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention can be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following description lists the embodiments of the present invention.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of a simulation apparatus according to the present embodiment;
fig. 2 is a partially enlarged view of the dynamic compaction device of the embodiment;
FIG. 3 is a side view of the simulation apparatus of the present embodiment;
FIG. 4 is a top view of the simulation apparatus of the present embodiment;
reference numerals: 1. a slide rail device; 11. a support; 12. a first slide rail; 13. a second slide rail; 14. a third slide rail; 2. a dynamic compaction device; 21. pulling a rope; 22. a rammer; 23. a roller; 24. hooking; 3. a model box; 31. a transparent tempered glass baffle; 32. black dots; 33. a soil mass model; 4. a pile foundation model; 5. and a dynamic compaction area.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 4, the utility model discloses install soil body model 33, pile foundation model 4 in mold box 3, make dynamic compaction device 2 can remove on the plane through slide rail device 1, ram 22 free fall carries out the dynamic compaction to soil body model 33 to this dynamic compaction operation when simulating the work progress, then through the change to pile foundation model 4 study dynamic compaction have the influence such as displacement, the deformation of the pile foundation production of different distances to the periphery.
Referring to fig. 1 to 4, the present embodiment provides a simulation apparatus for influence of a dynamic compaction process on a pile foundation, which includes a slide rail device 1, a dynamic compaction device 2, a model box 3 and a pile foundation model 4.
Specifically, a soil model 33 is uniformly paved inside the model box 3 (the soil model 33 is composed of soil); the slide rail device 1 comprises a first slide rail 12, and the first slide rail 12 is arranged on the upper end surface of the model box 3; the dynamic compaction device 2 comprises a roller 23, a pull rope 21 and a rammer 22; the dynamic compaction device 2 is arranged below the first slide rail 12 and can horizontally move on the first slide rail 12; the rolling shaft 23, the pull rope 21 and the rammer 22 are sequentially connected, and the rolling shaft 23 dynamically tamps the soil body model 33 when falling freely; the pile foundation model 4 is installed in the model box 3, and the upper end part of the pile foundation model 4 extends out of the soil body model 33; the cross section of the pile foundation model 4 is semicircular, and the cross section of the pile foundation model along the axis of the pile body is tightly attached to one inner wall of the model box 3; and a sensing device for measuring the displacement change of the pile foundation and the stress condition of the pile body is arranged on the pile foundation model 4.
The slide rail device 1 further comprises a second slide rail 13 and a third slide rail 14; four corners of the top of the model box 3 are respectively provided with a bracket 11 in a vertical mode; the second slide rail 13 is arranged above two adjacent brackets 11, the third slide rail 14 is arranged above the other two brackets 11, and the second slide rail 13 and the third slide rail 14 are arranged in parallel; the two ends of the first slide rail 12 are respectively connected with the second slide rail 13 and the third slide rail 14, and the first slide rail 12 can slide on the second slide rail 13 and the third slide rail 14.
In this embodiment, the mold box 3 is a rectangular parallelepiped, and the slide rail device 1 is composed of a bracket 11 disposed on a short side of the mold box 3, a second slide rail 13 and a third slide rail 14 vertically disposed on the two brackets 11, and the first slide rail 12; the dynamic compaction device 2 consists of a pull rope 21, a rammer 22 and a roller 23, wherein the rammer 22 is suspended below the first slide rail 12 and can horizontally move on the first slide rail 12; soil 33 is uniformly paved in the model box 3, a transparent toughened glass baffle 31 is arranged on the front surface of the model box, and the rest three surfaces are steel plates; the cross-section of the pile foundation model 4 is semicircular, the cross-section of the pile foundation model along the axis of the pile body is tightly attached to the toughened glass baffle plate 31, and the size of the pile foundation model 4 is determined by the reduced scale. The utility model discloses can simulate the work progress of dynamic compaction ground processing, adopt digital camera to catch the deformation of pile foundation model 4 to adopt image analysis technique to carry out the analysis of microcosmic mechanism, and then the analysis is to the influence of existing pile foundation at the dynamic compaction work progress, with this formulate reasonable dynamic compaction construction scheme.
In the embodiment, the model box 3 is divided into two areas, one area is used as a dynamic compaction area, and dynamic compaction construction process simulation is carried out; a pile foundation model 4 is placed in one area and used for observing the displacement change and the stress change of the pile foundation model 4; one area is used as a dynamic compaction area, and soil 33 is dynamically compacted in the construction process; the pile foundation model 4 can be arranged at a position with different distances from the dynamic compaction area, so that the influence of the pile foundation model 4 on the different distances from the dynamic compaction area can be compared conveniently; according to the symmetry of the research problem, only half of the pile foundation model 4 is taken for model simulation of the pile foundation model 4, the pile foundation model 4 is tightly attached to the inner wall of the toughened glass baffle 31, and the friction between the pile foundation model 4 and the contact surface of the baffle is effectively reduced through vacuum silicone grease; a displacement sensor is arranged on the top surface of the pile foundation model 4 in an adhering mode and used for measuring the displacement change of a pile foundation, and a strain gauge is arranged on the surface of the pile foundation model 4 and used for measuring the stress condition of a pile body; the slide rail device 1 can drive the rammer 22 to move in a plane, and the position of the rammer 22 above a dynamic compaction area can be adjusted to be used for observing the influence simulation of multipoint dynamic compaction on a pile foundation; the roller 23 can adjust the height of the pull rope 21, so that the height of the rammer 22 can be adjusted and controlled, and different ramming energies can be simulated; the draw cord 21 can also be made to bring the ram 22 free falling. The rammer 22 can drive the pull rope 21 to fall freely or the pull rope 21 controls the falling acceleration of the rammer 22, so that ramming under different accelerations is realized; the rammer 22 has models of rammers 22 with different diameters (specifically, the pull rope 21 and the rammer 22 are connected through a hook 24 to replace the rammer 22), so that the ramming energy can be regulated and controlled; the front of the model box 3 is a toughened glass baffle 31, black round points 32 are arranged on the surface of the model box at equal intervals as coordinate reference points, and the deformation of a foundation soil body 33 and the micro mechanism analysis of pile foundations of the soil body 33 around the pile are realized through photo acquisition and comparative analysis in different construction ramming construction simulation stages; supports 11 are erected at four corners of the model box 3, the supports 11 are connected with the model box 3 through angle steel, and second slide rails 13 and third slide rails 14 are arranged on the supports 11.
The embodiment provides a simulation device for pile foundation displacement influenced by dynamic compaction, which comprises the following steps when in use:
1. installing the soil body model 33 and the pile foundation model 4 in the model box 3;
2. the dynamic compaction device 2 is moved to a designated position through the first slide rail 12, and the rammer 22 falls freely to carry out dynamic compaction on the soil body, so as to simulate the dynamic compaction operation during construction;
3. the deformation of the pile foundation model is observed through the toughened glass baffle, the data of the displacement sensor and the strain gauge are collected, and the influence of dynamic compaction operation on the existing pile foundation is researched;
4. the ram 22 is replaced with a different diameter and the ram height is adjusted 22 to begin a new round of testing.
The above-mentioned be the utility model discloses a concrete implementation way, nevertheless the utility model discloses a design concept is not limited to this, and the ordinary use of this design is right the utility model discloses carry out immaterial change, all should belong to the act of infringement the protection scope of the utility model.
Claims (9)
1. The utility model provides a simulator of dynamic compaction process to pile foundation influence which characterized in that includes: the dynamic compaction device comprises a model box, a dynamic compaction device, a slide rail device and a pile foundation model;
soil body models are uniformly paved in the model boxes;
the slide rail device comprises a first slide rail, and the first slide rail is arranged on the upper end surface of the model box;
the dynamic compaction device comprises a rolling shaft, a pull rope and a rammer; the dynamic compaction device is arranged below the first sliding rail and can horizontally move on the first sliding rail; the rolling shaft, the pull rope and the rammer are sequentially connected, and the soil body model is dynamically rammed when the rolling shaft falls freely;
the pile foundation model is installed in the model box, and the upper end part of the pile foundation model extends out of the soil body model; the cross section of the pile foundation model is semicircular, and the cross section of the pile foundation model along the axis of the pile body is tightly attached to one inner wall of the model box; and the pile foundation model is provided with a sensing device for measuring the displacement change of the pile foundation and the stress condition of the pile body.
2. The simulation device for the influence of the dynamic compaction process on the pile foundation according to claim 1, wherein the slide rail device further comprises a second slide rail and a third slide rail; four corners of the top of the model box are respectively and vertically provided with a bracket; the second slide rail is arranged above two adjacent brackets, the third slide rail is arranged above the other two brackets, and the second slide rail and the third slide rail are arranged in parallel; the two ends of the first slide rail are respectively connected with the second slide rail and the third slide rail, and the first slide rail can slide on the second slide rail and the third slide rail.
3. The apparatus of claim 2, wherein four of the supports are connected to the mold box by angle steel.
4. The device for simulating the influence of the dynamic compaction process on the pile foundation according to claim 1, wherein the sensing device comprises a displacement sensor and a strain gauge; the displacement sensor is arranged on the top surface of the pile foundation model; the strain gauge is arranged on the surface of the pile foundation model.
5. The device for simulating the influence of the dynamic compaction process on the pile foundation according to claim 1, wherein one of four side surfaces of the model box is provided with a transparent toughened glass baffle; the cross-section of pile foundation model along pile shaft axis with transparent toughened glass baffle inner wall closely laminates to effectively reduce the friction between pile foundation model and the baffle contact surface through vacuum silicone grease.
6. The apparatus for simulating the effect of a dynamic compaction process on a pile foundation of claim 5, wherein the apparatus further comprises a camera; the camera device is arranged in front of the transparent toughened glass baffle to shoot the dynamic compaction process.
7. The apparatus of claim 5, wherein the other three of the four sides of the mold box are provided as steel plates.
8. The device for simulating the influence of a dynamic compaction process on a pile foundation according to claim 1, wherein the pull rope and the rammer are connected through a hook to perform rammer replacement.
9. The apparatus for simulating the influence of the dynamic compaction process on the pile foundation according to claim 1, wherein the mold box is divided into two regions, one region being a dynamic compaction region, and the dynamic compaction apparatus is above the dynamic compaction region to perform dynamic compaction process simulation; and the other area is provided with the pile foundation model.
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| CN202120918986.6U CN214940484U (en) | 2021-04-29 | 2021-04-29 | Simulation device for influence of dynamic compaction process on pile foundation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116815835A (en) * | 2023-08-28 | 2023-09-29 | 四川合众精准科技有限公司 | Deep horizontal displacement monitoring system and monitoring method based on machine vision |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116815835A (en) * | 2023-08-28 | 2023-09-29 | 四川合众精准科技有限公司 | Deep horizontal displacement monitoring system and monitoring method based on machine vision |
| CN116815835B (en) * | 2023-08-28 | 2023-11-21 | 四川合众精准科技有限公司 | Deep horizontal displacement monitoring system and monitoring method based on machine vision |
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