Pile group settlement model
By designing a pile group settlement model and using earth pressure gauges and movable side plates to simulate the friction between the soil layer and the pile foundation, the problem of inaccurate calculation of pile group foundation settlement in existing technologies has been solved, and more accurate settlement calculation has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CCCC FOURTH HIGHWAY ENG CO LTD
- Filing Date
- 2025-06-12
- Publication Date
- 2026-05-19
AI Technical Summary
Existing methods for calculating pile settlement, such as the Geddes method, have significant biases when calculating pile group foundations, especially in failing to effectively simulate the friction between the soil layer and the pile foundation, resulting in inaccurate calculation results.
A pile group settlement model was designed. By setting up earth pressure gauges and movable side plates in the model, the friction between the soil layer and the pile foundation was simulated. The earth pressure gauges were used to measure the friction and study its impact on settlement.
It enables effective simulation of the relationship between soil layer and pile foundation friction and settlement, improves the accuracy of settlement calculation, and reduces calculation deviation.
Smart Images
Figure CN224259468U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of experimental research on the settlement of pile foundations, and in particular to a pile foundation settlement model. Background Technology
[0002] In recent years, the number of high-rise buildings has gradually increased, and pile foundations have been widely used in the foundations of high-rise buildings. Due to insufficient research on the complex mechanical behavior of pile-soil interactions, current methods for calculating pile foundation settlement are not yet perfect. Currently, the commonly used simplified method in engineering is the Geddes method based on Mindlin's solution to calculate the settlement of pile group foundations, but the calculated values differ significantly from the actual values. This study uses finite element analysis software to establish a model and analyze the reasons for the deviations in settlement calculations using the Geddes method based on Mindlin's solution for single-pile, multi-pile, and pile group foundations with different pile numbers, and analyzes the factors affecting the settlement calculation results. The analysis shows that the assumption of perfectly elastic soil in the Geddes method, different values of α and β, different bearing layers at the pile ends, and whether or not the pile cap is considered all have a certain impact on the results. However, the most significant factor causing the deviation is the assumption that the pile-soil interaction force is a vertical force in the Geddes method. For pile group foundations, the deviation rate of the Geddes method is over 200%, while the deviation rate of the Geddes method after using shear stress instead of vertical force is less than 20%, a difference of more than ten times. Shear stress refers to the frictional force between the soil layer and the pile foundation.
[0003] Therefore, the friction between the soil layer and the pile foundation has a significant impact on the settlement of the pile foundation. Currently, there is a lack of a pile group settlement model that can simulate the friction between the soil layer and the pile foundation, thereby facilitating the simulation experiment of the relationship between shear stress and settlement. Utility Model Content
[0004] The purpose of this invention is to provide a pile group settlement model to enable the study of the relationship between friction and settlement between soil layers and pile foundations.
[0005] To solve the above-mentioned technical problems, the technical solution of the pile group settlement model in this utility model is as follows:
[0006] A pile group settlement model includes a base plate and front and rear side plates fixed to the front and rear ends of the base plate. It also includes a top plate for detachable connection to the top of the front and rear side plates via bolts. Multiple pile positioning holes are provided on the top and base plates. The pile group settlement model also includes pile models at the upper and lower ends for positioning and inserting into the corresponding pile positioning holes. The pile group settlement model further includes a left side plate and a right side plate. The left side plate is driven by a left side plate drive mechanism and can move left and right. The right side plate is also driven by a right side plate drive mechanism and can move left and right. The left side plate, right side plate, top plate, base plate, front side plate, and rear side plate enclose a soil filling space for soil filling. The pile group settlement model also includes an earth pressure gauge installed in the soil layer.
[0007] Furthermore, earth pressure gauges are distributed between two adjacent pile foundation models in the left-right direction, and at least three earth pressure gauges are distributed between two adjacent pile foundation models at intervals in the up-down direction.
[0008] Furthermore, a model base plate is fixed on the base plate, a left reaction plate is fixed to the left end of the model base plate, a right reaction plate is fixed to the right end of the model base plate, a left plate drive mechanism is set between the left reaction plate and the left plate, and a right plate drive mechanism is set between the right reaction plate and the right plate.
[0009] Furthermore, the left side plate drive mechanism is a left side drive cylinder with its axis extending in the left-right direction, and the right side plate drive mechanism is a right side drive cylinder with its axis extending in the left-right direction.
[0010] Furthermore, a left-side pad and a right-side pad are arranged at intervals between the model base plate and the bottom plate. The model base plate, the bottom plate, the left-side pad and the right-side pad form a settlement gap that communicates with the pile positioning holes on the bottom plate.
[0011] Furthermore, the settlement gap is provided with a pile positioning plate that can be inserted and pulled out in the front-to-back direction.
[0012] The beneficial effects of this utility model are as follows: In use, the upper and lower ends of each pile foundation model are respectively positioned and inserted into the corresponding pile foundation positioning holes. The outer periphery of the pile foundation model is filled with soil layers, and soil pressure gauges are distributed in the soil layers. The left and right side plates move relative to each other under the drive of the corresponding drive mechanism, thus squeezing the soil layers. The pressurized soil layers generate friction between the pile foundation models to simulate the friction force experienced by the pile foundation in the soil layers in the real environment. The soil layers located at the center of the left and right side plates are subjected to the least squeezing effect. Therefore, the relationship between different soil layer pressures and the friction force between the corresponding pile foundations can be simulated. By detecting the settlement value of the corresponding pile foundation models, the relationship between friction force and pile foundation settlement can be studied. Attached Figure Description
[0013] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding portions, wherein:
[0014] Figure 1 This is a schematic diagram of the structure of one embodiment of the pile group settlement model in this utility model;
[0015] Figure 2 yes Figure 1 Top view;
[0016] Figure 3 This is a schematic diagram showing the state of the space after the soil layer has been filled into the soil filling layer.
[0017] Figure 4 This is a usage state diagram of an embodiment of this utility model;
[0018] 1. Left reaction plate; 2. Left drive mechanism; 3. Front plate; 4. Bolt; 5. Top plate; 6. Pile foundation positioning hole; 7. Soil filling space; 8. Right drive mechanism; 9. Right reaction plate; 10. Left plate; 11. Pile foundation positioning plate; 12. Right plate; 13. Pile foundation model; 14. Bottom plate; 15. Pad plate; 16. Settlement gap; 17. Pile foundation plate; 18. Soil layer; 19. Earth pressure gauge; 20. Pile foundation model; 21. Counterweight. Detailed Implementation
[0019] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.
[0020] It should be noted that, unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.
[0021] An example of the implementation of a pile group settlement model in this utility model is shown below. Figures 1-4As shown: It includes a base plate 14 and a front side plate 3 and a rear side plate fixed to the front and rear ends of the base plate 14. It also includes a top plate 5 for detachably connecting to the top of the front side plate and the rear side plate by bolts 4. Multiple pile foundation positioning holes 6 are provided on the top plate 5 and the base plate 14. Correspondingly, the pile foundation positioning holes on the base plate are located directly below the pile foundation positioning holes on the corresponding top plate.
[0022] The pile group settlement model also includes pile foundation models 20, which are positioned at the top and bottom ends and inserted into the corresponding pile foundation positioning holes. The pile group settlement model also includes a left side plate 10 and a right side plate 12. The left side plate is driven by a left side plate driving mechanism 2 and can move left and right, and the right side plate is driven by a right side plate driving mechanism 8 and can move left and right. In this embodiment, a model base plate 17 is fixed to the lower side of the base plate. A left side reaction plate 1 is fixed to the left end of the model base plate 17, and a right side reaction plate 9 is fixed to the right end of the model base plate. The left side reaction plate 1 and the right side reaction plate 9 are arranged side by side with intervals. The left side plate driving mechanism 2 is located between the left side reaction plate and the left side plate, and the right side plate driving mechanism 8 is located between the right side reaction plate and the right side plate.
[0023] Specifically, the left side plate drive mechanism is a left-side drive cylinder with its axis extending in the left-right direction, and the right side plate drive mechanism is a right-side drive cylinder with its axis extending in the left-right direction.
[0024] The left side plate, right side plate, top plate, bottom plate, front side plate and rear side plate enclose a soil filling space 7 for filling soil layer 18. The pile group settlement model also includes an earth pressure gauge 19 installed in the soil layer.
[0025] In this embodiment, earth pressure gauges 19 are distributed between two adjacent pile foundation models 20 in the left-right direction, and at least three earth pressure gauges are distributed between two adjacent pile foundation models 20 at intervals in the vertical direction. Earth pressure gauges are also distributed to the left of the leftmost pile foundation model and to the right of the rightmost pile foundation model.
[0026] A base plate 15 is provided between the model base plate and the bottom plate, with left and right spaced pads 15. The pad on the left is called the left pad, and the pad on the right is called the right pad. The model base plate, the bottom plate, the left pad, and the right pad form a settlement gap 16 that communicates with the pile positioning holes on the bottom plate. A pile positioning plate 11 that can be inserted and pulled out in the front-back direction is provided in the settlement gap.
[0027] When using it, firstly as follows Figure 3As shown, the pile foundation positioning plate is inserted into the settlement gap, the top plate is removed, and the lower end of the pile foundation model is positioned and inserted into the pile foundation positioning hole on the bottom plate. Soil is filled between the piles, and soil pressure gauges are installed at corresponding positions during the filling process. The top plate is then fixed to the top of the front and rear side plates with bolts. The left and right drive mechanisms drive the left and right side plates to move relative to each other, applying pressure to the soil. The pile foundation positioning plate is then removed. Figure 4 As shown, each pile foundation model has a settlement gap at its bottom to facilitate settlement. There is a frictional force f between the outer surface of each pile foundation model and the surrounding soil layer. This frictional force f = μN, where μ represents the friction coefficient of the outer surface of the pile foundation model (which is known), and N represents the normal pressure exerted by the soil layer on the pile foundation, measured by a soil pressure gauge. Subsequently, the piston rods of the left and right drive mechanisms continue to extend, and the left and right plates continue to move closer, applying pressure to the soil layer. A counterweight can be placed on top of the corresponding pile foundation model to simulate a building above the pile foundation in a real environment. The influence between soil friction and pile foundation settlement is studied by monitoring the vertical settlement of the pile foundation.
[0028] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "joined" should be interpreted broadly. For example, the term "joined" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0029] Based on the above description in this specification, those skilled in the art will also understand that terms used, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not imply that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.
[0030] Furthermore, the terms "first" or "second," etc., used in this specification to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.
[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.
Claims
1. A group pile settlement model, characterized in that: The model includes a base plate and front and rear side plates fixed to the front and rear ends of the base plate. It also includes a top plate for detachably connecting to the top of the front and rear side plates by bolts. Multiple pile positioning holes are provided on the top and base plates. The pile group settlement model also includes pile models at the top and bottom ends for positioning and inserting into the corresponding pile positioning holes. The pile group settlement model also includes a left side plate and a right side plate. The left side plate is driven by a left side plate drive mechanism and can move left and right. The right side plate is driven by a right side plate drive mechanism and can move left and right. The left side plate, right side plate, top plate, base plate, front side plate, and rear side plate form a soil filling space for soil filling. The pile group settlement model also includes an earth pressure gauge installed in the soil layer.
2. The group pile settlement model according to claim 1, characterized in that: Earth pressure gauges are distributed between two adjacent pile foundation models in the left-right direction, and at least three earth pressure gauges are distributed between two adjacent pile foundation models at intervals in the up-down direction.
3. The group pile settlement model according to claim 1, wherein: A model base plate is fixed on the base plate. A left reaction plate is fixed to the left end of the model base plate, and a right reaction plate is fixed to the right end of the model base plate. The left plate drive mechanism is located between the left reaction plate and the left plate, and the right plate drive mechanism is located between the right reaction plate and the right plate.
4. The group pile settlement model according to claim 3, wherein: The left side plate drive mechanism is a left-side drive cylinder with its axis extending in the left-right direction, and the right side plate drive mechanism is a right-side drive cylinder with its axis extending in the left-right direction.
5. The group-pile settlement model according to claim 3 or 4, characterized in that: The model base plate and the bottom plate are provided with left and right spaced pads. The model base plate, bottom plate, left pad and right pad form a settlement gap that communicates with the pile positioning holes on the bottom plate.
6. The group pile settlement model according to claim 5, wherein: The settlement gap is provided with a pile positioning plate that can be inserted and pulled out in the front-back direction.