Indoor model test device for testing influence of static pressure pile foundation construction on surrounding building deformation

Abstract

The invention relates to an indoor model test device for testing the influence of static pressure pile foundation construction on the deformation of surrounding buildings, which comprises a model box for accommodating a soil body, and the top surface of the model box is provided with an opening; the building model is a closed cubic model and is partially buried in the soil body in the model box; the enclosing wall model is a cubic solid model and is partially buried in the soil body in the model box; the stress release groove model is a regular cuboid groove model excavated in the soil body of the model box; the stress release hole model is a hollow cylinder model formed by customized processing of a plastic hose; the pile foundation model is a solid cylinder model formed by customizing and processing wood; the LVDT displacement meters are fixed to the upper portion of the enclosing wall model and the upper portion and the side portion of the building model through displacement meter supports. According to the method, the influence of static pressure pile foundation construction on the adjacent surrounding buildings and enclosing walls is simulated by adopting the construction measures of the stress release ditches and the stress release holes, and the method has important reference value for similar actual engineering on the site.

Description

Technical Field

[0001] The invention relates to a construction engineering simulation experiment device, in particular to an indoor model experiment device for the influence of static pressure pile foundation construction on the deformation of surrounding buildings. Background Art

[0002] As the residential buildings in the city become more and more dense, the distance between the newly built residential areas and the existing building structures in the surrounding areas is getting closer and closer, and the construction environment around the new construction projects is becoming more and more complex. In actual projects, as the distance between the newly built residential buildings and the existing surrounding residential buildings and walls is getting closer and closer, the spatial position relationship is becoming more and more complex. Especially in the construction process of static pile foundations of residential buildings, due to improper construction pile foundation sequence, unreasonable construction time, and failure to take relevant construction protection measures, the surrounding soil body will produce a large stress compression effect, causing the displacement and deformation of the surrounding soil body to be too large, which will cause the displacement of the surrounding existing buildings and walls, and seriously affect the safety and stability of the structure. In a complex construction environment, especially the use of relevant construction protection measures, and the optimization of the construction sequence of static pile foundations, the prediction and control of the surrounding environmental effects, and the protection of the surrounding existing buildings are issues that need to be paid attention to.

[0003] The existing research methods for the influence of static pile foundation construction on the deformation of surrounding buildings mainly include theoretical analysis, numerical simulation and on-site monitoring. The theoretical analysis method mainly comes from engineering experience and the empirical value obtained by statistical methods; the numerical simulation method is limited to the finite element simulation of the influence of static pile foundation construction on the surrounding existing buildings, and fails to consider the actual construction sequence of static pile foundation, the actual time and space interaction of soil, and fails to propose the construction protection measures of stress release trenches and stress release holes; the on-site monitoring method is constrained by a certain actual on-site fixed working condition, and cannot consider the influence analysis of the displacement of surrounding soil and existing buildings under variable construction conditions. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies of the above-mentioned prior art and to propose an indoor model test device for the influence of static pressure pile foundation construction on the deformation of surrounding buildings. By simulating the deformation of surrounding soil and surrounding existing buildings under different construction conditions of static pressure pile foundation using stress release trenches and stress release holes as construction protection measures, the present invention provides important reference value for different on-site actual projects.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an indoor model test device for the influence of static pressure pile foundation construction on the deformation of surrounding buildings, comprising a model box: used to contain soil, in a rectangular shape, and its top surface is set as an opening; a building model: a closed cubic model made of wooden boards and wooden blocks, partially buried in the soil in the model box; a wall model: a cubic solid model made by customized cutting of wood, partially buried in the soil in the model box; a stress release groove model: a regular rectangular groove model excavated in the soil of the model box according to test requirements; a stress release hole model: a hollow cylindrical model customized by a plastic hose; a pile foundation model: a solid cylindrical model customized by wood; and a plurality of LVDT displacement meters: fixed to the upper part of the wall model, the upper part and the side of the building model through a displacement meter bracket.

[0006] Compared with the prior art, the present invention has the following beneficial effects: the present invention can measure the vertical displacement of the wall model and the horizontal and vertical displacements of the building model through multiple displacement meters, so as to conveniently and effectively simulate the deformation influence of static pressure pile foundation construction using stress release holes on the surrounding buildings, which has important reference value for similar actual projects on site. The advantages are as follows: 1. The test device is easy to make and has good extensiveness in related scientific research. The test scheme has strong scalability and can be further applied to the deformation effect of static pressure pile foundation construction on surrounding buildings, especially the construction protection measures of stress release grooves and stress release holes; 2. The static pressure pile foundation model of this experiment can well simulate different static pressure pile foundation construction conditions. By adjusting the construction time and space effects of the static pressure pile foundation, different static pressure pile foundation construction conditions can be simulated to better obtain the deformation effect of the corresponding fence and existing buildings; 3. This experiment can also control the relative position relationship between the static pressure pile foundation and the existing fence and building, and then obtain different influence conditions through experiments, which can realize the displacement deformation effect under different position relationships, thereby obtaining a series of experimental data under different working conditions; 4. The model test study of the influence of static pressure pile foundation construction with stress release holes on the deformation of surrounding buildings using this set of simulation test equipment can provide good consultation and suggestions for the on-site construction of static pressure pile foundation projects of residential buildings with complex surrounding construction environments, and provide certain theoretical references for the formulation of control of static pressure pile foundation construction to reduce the impact on the surrounding environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a 3D schematic diagram of a model test device in an embodiment of the present invention;

[0008] Figure 2 It is a 3D schematic diagram of the model test device in another direction of the embodiment of the present invention;

[0009] Figure 3It is a schematic plan view of a model test device in an embodiment of the present invention;

[0010] Figure 4 It is a side schematic diagram of a model test device in an embodiment of the present invention;

[0011] Figure 5 It is a front schematic diagram of a model test device in an embodiment of the present invention;

[0012] Figure 6 A schematic diagram of a building model plane in an embodiment of the present invention;

[0013] Figure 7 A schematic side view of a building model in an embodiment of the present invention;

[0014] Figure 8 It is a front view schematic diagram of a building model in an embodiment of the present invention;

[0015] Fig. 9 It is a schematic plan view of a wall model in an embodiment of the present invention;

[0016] Fig.10 It is a side view of a wall model in an embodiment of the present invention;

[0017] Fig.11 It is a front view of a wall model in an embodiment of the present invention;

[0018] Fig.12 It is a plane schematic diagram of a stress release groove model in an embodiment of the present invention;

[0019] Fig.13 It is a side schematic diagram of a stress release groove model in an embodiment of the present invention;

[0020] Fig.14 It is a front view schematic diagram of a stress release groove model in an embodiment of the present invention;

[0021] Fig.15 It is a front schematic diagram of a stress release hole model in an embodiment of the present invention;

[0022] Fig.16 It is a front schematic diagram of a pile foundation model in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below by means of a preferred embodiment in conjunction with the accompanying drawings.

[0024] Figure 1 It is a 3D schematic diagram of a model test device in an embodiment of the present invention; Figure 2 It is a 3D schematic diagram of the model test device in another direction of the embodiment of the present invention; Figure 3It is a schematic plan view of a model test device in an embodiment of the present invention.

[0025] See also Figure 1 , Figure 2 and Figure 3 , first, make a model box 1, a building model 2, a wall model 3, a stress release hole model 5 and a pile foundation model 6;

[0026] The model box 1 is used to contain soil and is in a rectangular shape, with an opening on the top surface;

[0027] Building model 2 is a closed cubic model made of wooden boards and wooden blocks, which is partially buried in the soil in the model box;

[0028] The wall model 3 is a cubic solid model made of custom-cut wood, which is partially buried in the soil in the model box;

[0029] The stress release trench model 4 is a regular rectangular trench model excavated in the soil of the model box according to the test requirements;

[0030] The stress relief hole model 5 is a hollow cylindrical model made by custom processing of a plastic hose;

[0031] The pile foundation model 6 is a solid cylindrical model made of customized wood;

[0032] Multiple LVDT displacement meters: fixed on the upper part of the fence model, the upper part of the building model and the side part through displacement meter brackets.

[0033] Preferably, the model box 1 in the embodiment of the present invention has a rectangular shape, an internal space size of 1500mm×1000mm×1000mm (length×width×height), and is composed of wooden boards with a thickness of 10mm. The building model 2 is a closed cubic model made of a 10mm thick wooden board and 12 side wood blocks, with an outer dimension of 400mm×200mm×600mm (length×width×height). After being positioned and specifically placed in the soil, it is about 50-60mm away from the wall model 3, preferably 54mm, and buried 100mm in the soil in the model box. The wall model 3 is a cubic entity model made of customized wood cutting, with an outer dimension of 980mm×6mm×50mm (length×width×height). After being positioned and placed in the soil, it is about 60mm away from the stress release groove model 4 and buried 10mm in the soil in the model box. The stress release trench model 4 is located in the soil of the model box. After positioning, it is about 60mm away from the wall model 3. According to the test requirements, a rectangular trench model with a size of 980mm×60mm×60mm (length×width×height) is excavated. The stress release hole model 5 is a hollow cylindrical model with an inner diameter of 12mm made of a customized plastic hose. Along the bottom center of the stress release trench model 4, the hole center spacing is 30mm, and it is completely buried in the soil, while keeping the stress release hole model hollow. The pile foundation model 6 is a solid cylindrical model with an inner diameter of 20mm made of customized wood. After positioning and placing in the soil, the top is buried 60mm in the soil, and the vertical and horizontal pile center spacing is 80mm. Two rows are set, and 50mm is close to the edge of the stress release trench model. The displacement meter is placed on the building model 2 and the wall model 3. The LVDT displacement meter numbered 7-35 is marked.

[0034] Figure 4 It is a side view of the simulation test device in the model box in the embodiment of the present invention, Figure 5 It is a front schematic diagram of the simulation test device in the model box in an embodiment of the present invention. Figure 4 Numbers 7-21 are LVDT displacement meters on the top of the wall model, numbers 22-28 are LVDT displacement meters on the top of the building model, and numbers 29-35 are LVDT displacement meters on the sides of the building model. Each displacement meter is evenly arranged at intervals of 60 mm. In this embodiment, the displacement meter is used to measure the longitudinal and transverse deformations of the wall model and the building model, and its specific measurement values ​​can be obtained by an external displacement data acquisition instrument.

[0035] Please continue to see Figure 6 , Figure 7 and Figure 8, is the building model 2 in the embodiment of the present invention, a closed cubic model made of a 10mm thick wooden board and 12 side wooden blocks, with an outer dimension of 400mm×200mm×600mm (length×width×height). After being positioned and placed in the soil, it is about 54mm away from the wall model 3 and buried 100mm in the soil in the model box.

[0036] Fig. 9 , Fig.10 and Fig.11 The wall model 3 in the embodiment of the present invention is a cubic solid model made by customized cutting of wood, with an outer dimension of 980mm×6mm×50mm (length×width×height). After being positioned in the soil, it is about 60mm away from the stress release trench model 4 and buried 10mm into the soil in the model box.

[0037] Fig.12 , Fig.13 and Fig.14 The stress release trench model 4 in the embodiment of the present invention is located in the model box soil body, about 60 mm away from the wall model 3. According to the test requirements, a rectangular trench model with a size of 980 mm × 60 mm × 60 mm (length × width × height) is excavated.

[0038] Fig.15 It is the stress release hole model 5 of the fence mold in the embodiment of the present invention, which is a hollow cylindrical model with an inner diameter of 12 mm made by custom-processing a plastic hose.

[0039] Fig.16 It is the pile foundation model 6 in the embodiment of the present invention, which is a solid cylindrical model with an inner diameter of 20 mm made by custom processing of wood.

[0040] The present invention firstly extracts the original soil from the soil layer of the actual on-site building pile foundation project to be simulated, ensuring that the displacement response of the soil in the model box is closest to the real reality. At the same time, when filling the model box, the thickness of each layer of soil filling is proportionally scaled according to the corresponding geological survey report before filling in layers, and the filling must be compacted in layers. At the same time, when filling in layers, the corresponding building model 2 and the wall model 3 need to be positioned in the corresponding soil. After the filling is completed, the stress release ditch model 4 is located and excavated, and the stress release hole model 5 is installed. After that, all LVDT displacement meters are fixed on the top of the wall model, the top and side of the building model, and the LVDT displacement meter in the vertical direction is kept vertically upward, fixed in the horizontal direction, and can be adjusted in the vertical direction, and the LVDT displacement meter in the lateral direction is kept horizontal, fixed in the vertical direction, and can be adjusted in the horizontal direction.

[0041] During the test, according to the working conditions of the simulated static pressure pile foundation construction, the pile foundation model 6 is pressed into the soil in sequence according to the simulated working conditions to reach the predetermined depth of burial in the soil. During the period, the readings of each instrument are observed and recorded until all the pile foundation construction is completed. Subsequently, data collection and sorting are performed to analyze the influence of the static pressure pile foundation construction using stress release holes on the surrounding existing walls and buildings. In addition, by adjusting the construction sequence of the static pressure pile foundation, the construction time of the static pressure pile foundation, the spatial position relationship between the static pressure pile foundation and the existing buildings, the size and position relationship of the stress release groove, the size and length of the stress release aperture and the setting position relationship, by adjusting and simulating different construction conditions, the deformation influence of the static pressure pile foundation construction using stress release holes on the surrounding existing structures can be obtained. Similarly, by adjusting the relative spatial position relationship between each simulation device, different influencing working conditions can be obtained through experiments, and the displacement deformation influence under different position relationships can be realized, thereby obtaining a series of experimental data under different working conditions.

[0042] The above-mentioned embodiment of the present invention uses an indoor model test device to study the impact of static pressure pile foundation construction with stress release holes on surrounding existing walls and buildings under different working conditions. It can obtain the deformation influence of adjacent structures under different construction conditions, and provide a certain theoretical reference for formulating relevant construction measures to control static pressure pile foundation construction and reduce the impact on the surrounding environment.

[0043] Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the definition of the claims.

Claims

1. An indoor model test device for the influence of static pressure pile foundation construction on the deformation of surrounding buildings, characterized in that: include: Model box: used to contain soil, in the shape of a rectangular parallelepiped, with an opening on the top surface; Building model: A closed cubic model made of planks and blocks, partially buried in the soil in the model box; Fence model: A cubic solid model made of custom cut wood, partially buried in the soil in the model box; Stress release trench model: a regular rectangular trench model excavated in the soil of the model box according to the test requirements; Stress relief hole model: a hollow cylindrical model made by customized processing of plastic hose; Pile foundation model: a solid cylindrical model made of customized wood; Multiple LVDT displacement meters: fixed on the upper part of the fence model, the upper part of the building model and the side part through displacement meter brackets.

2. The indoor model test device for the effect of static pile foundation construction on the deformation of surrounding buildings according to claim 1 is characterized in that: The soil in the model box comes from the actual original soil taken from the site to be simulated. When filling the model box, the thickness of each layer of soil is proportionally scaled according to the geological survey report of the site to be simulated, and then the filling is carried out in layers and compacted in layers.

3. The indoor model test device for the effect of static pile foundation construction on the deformation of surrounding buildings according to claim 2 is characterized in that: The building model and the wall model are positioned in the corresponding soil body when filling the soil layer by layer, so that the relative position of the building model and the wall model is consistent with the actual on-site situation to be simulated.

4. The indoor model test device for the effect of static pile foundation construction on deformation of surrounding buildings according to claim 1 is characterized in that: The model box is a rectangular box formed by splicing wooden boards with a thickness of 10 mm.

5. The indoor model test device for the effect of static pile foundation construction on deformation of surrounding buildings according to claim 1 is characterized in that: The building model is 50-60 mm away from the wall model, the wall model is 60 mm away from the stress release ditch model, and the edge of the stress release ditch model is 60 mm away from the pile foundation model.

6. The indoor model test device for the effect of static pile foundation construction on deformation of surrounding buildings according to claim 1 is characterized in that: The stress release trench model is a regular rectangular trench excavated after the filling in the model box is completed and scaled according to the requirements of the on-site simulation test.

7. The indoor model test device for the effect of static pile foundation construction on deformation of surrounding buildings according to claim 1 is characterized in that: The stress release hole model is a hollow cylindrical model with an inner diameter of 12 mm, which is customized from a plastic hose. It is distributed along the bottom center of the stress release groove model, with a hole center spacing of 30 mm. The stress release hole model is completely buried inside the soil while maintaining a hollow state inside the stress release hole model. The pile foundation model is a solid cylindrical model with an inner diameter of 20 mm, which is customized from wood. The solid cylindrical model is arranged in two rows, with the top buried 60 mm in the soil, and the longitudinal and transverse pile center spacings are both 80 mm.

8. The indoor model test device for the effect of static pile foundation construction on deformation of surrounding buildings according to claim 1 is characterized in that: The LVDT displacement meter is fixed in the horizontal direction, and the LVDT displacement meter is kept vertically upward and can be adjusted in the vertical direction.

9. The indoor model test device for the effect of static pile foundation construction on the deformation of surrounding buildings according to claim 1 is characterized in that: Each LVDT displacement meter is used to measure the vertical displacement of the wall model, the vertical displacement of the building model and the horizontal displacement at different positions. At the same time, it measures the displacement changes caused by different static pressure pile foundation construction sequences, the cumulative displacement effect of static pressure pile foundation construction time and the different distances between static pressure pile foundations and the building. Each LVDT displacement meter is evenly arranged at intervals of 60mm.

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