CN114739353B - Pile-soil interaction visual anti-interference experimental device and experimental method - Google Patents
Pile-soil interaction visual anti-interference experimental device and experimental method Download PDFInfo
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- CN114739353B CN114739353B CN202210215845.7A CN202210215845A CN114739353B CN 114739353 B CN114739353 B CN 114739353B CN 202210215845 A CN202210215845 A CN 202210215845A CN 114739353 B CN114739353 B CN 114739353B
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- 239000002689 soil Substances 0.000 title claims abstract description 104
- 230000003993 interaction Effects 0.000 title claims abstract description 38
- 238000002474 experimental method Methods 0.000 title claims abstract description 37
- 230000000007 visual effect Effects 0.000 title claims abstract description 34
- 238000006073 displacement reaction Methods 0.000 claims abstract description 22
- 239000011521 glass Substances 0.000 claims abstract description 4
- 239000012780 transparent material Substances 0.000 claims abstract description 4
- 239000004576 sand Substances 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000003825 pressing Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000012800 visualization Methods 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 2
- 238000010030 laminating Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 25
- 239000010410 layer Substances 0.000 description 18
- 238000011160 research Methods 0.000 description 4
- 229910000746 Structural steel Inorganic materials 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000005350 fused silica glass Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000037237 body shape Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to a pile-soil interaction visual anti-interference experimental method, which comprises the following steps: strain gauge installation, model half pile installation, soil filling and measurement; the invention also relates to a pile-soil interaction visual anti-interference experimental device, which comprises a box body, a model half pile, a displacement sensor, a visual system and a vertical loading device, wherein the front side wall of the box body is of an organic glass structure and is provided with two inner liners, the model half pile is of a semicircular pipe structure, the two circumferential ends of the model half pile are provided with outward flanging, the front side wall of the box body is provided with a left inner liner and a right inner liner, the inner liners are made of rigid transparent materials, the two inner liners are pressed on the outward flanging in a one-to-one correspondence manner, and the inner liners are attached to the front side wall of the box body. The invention has the advantage of preventing soil from entering between the model half pile and the side wall of the box body during experiments, and solves the problem that the accuracy of the experiments is affected by the fact that soil easily enters between the model half pile and the side wall during the soil interaction experiments in the existing half pile mode.
Description
Technical Field
The invention relates to the technical field of subway tunnel building construction, in particular to a pile-soil interaction visual anti-interference experimental device and an experimental method.
Background
In the civil engineering foundation treatment, the problems of insufficient bearing capacity and stability, compression, uneven sedimentation, liquefaction and the like of the foundation are often faced. Pile foundations are widely used in various engineering constructions as a method for treating bad foundations most commonly used. However, under the action of vertical load, pile foundation and pile surrounding soil particles interact to bear the load of the upper structure together, the action rule is complex, the difficulty of pile foundation research in the foundation is always solved, and the construction cost is greatly improved by analyzing the conservative estimation of the deformation and the damage of the foundation.
The pile-soil interaction law mainly comprises pile foundation and pile surrounding soil, the pile foundation is made of a concrete material with relatively uniform and high strength, and the stress and deformation law are in a stable and easily-measured linear elastic range; the property of the pile surrounding soil is complex, plastic deformation which is difficult to describe is mainly used under large displacement, and the property is influenced by a loading and unloading path, so that the difficulty of researching the interaction of the pile and the soil is caused, the deformation, displacement, damage and the like of a predicted pile body are greatly different from the design condition, and even the failure of a pile foundation is caused. The interaction of pile and soil is researched, the influence of the pile and soil on the foundation strength, deformation and stability is evaluated, and the method has great significance on design basis and evaluation parameters in engineering practice.
However, the research method for pile-soil interaction in the prior art is not perfect, and the rule of pile-soil interaction is difficult to accurately research. In the traditional indoor pile foundation model experiment, under the action of pile top load, information such as stress, deformation, displacement, soil particle breakage and the like in the soil body around the pile are buried in the soil body, and often accurate measurement is difficult. Based on the defects of the method, partial engineering technical researchers adopt a scale-reducing experiment, and in a model box with a size level of tens of centimeters, amorphous silicon or fused quartz sand is mixed with corresponding fluid to prepare transparent soil so as to simulate the saturated soil around the pile, thereby realizing the visual research of pile-soil interaction. However, the reasons that the simulated amorphous silicon or fused quartz sand has a large difference with the soil particle property in the actual engineering, the soil in the actual engineering is always in an unsaturated state, the model shrinkage scale in the transparent soil experiment is too large, and the like are very likely to cause that the displacement of the soil around the pile is inconsistent with the actual engineering. In addition, in transparent soil experiments, the crushing of soil particles under the interaction of pile and soil is still difficult to measure at present, the vertical adherence state of the penetrating pile body is still difficult to maintain in a visual experiment, and the pile body shape is too simple in the experiment and the deformation of the pile body is still difficult to measure. Therefore, in a large model experiment under engineering real soil particles, the experimental method for reflecting pile-soil interaction is very necessary.
In order to be able to acquire experimental results by adopting natural soil, an experimental device and a method for performing experiments by using half piles are disclosed in a patent document of China patent No. CN201910077530.9, namely, half piles of a model are attached to a transparent wall of a box body, at the moment, the soil is affected by the half piles of the model to change on a part positioned on the transparent wall, so that observation can be realized without penetrating through the soil body, the problem that experiments can be performed by using transparent simulated soil is solved, and the experiments can be performed by using the natural soil.
The experimental device and method are inserted in the following defects: in the experimental process, the pressure of soil movement can cause gaps between the model half piles and the transparent side walls to enter between the model half piles and the side walls, and the characteristics of the half piles of the experiment can be interfered after soil is carried out between the model half piles and the side walls, so that the accuracy of experimental results is poor; when the strain gauge is adhered to the model half pile, the elastic modulus of the model half pile is greatly disturbed by an adhered object (glue or double faced adhesive tape and the like), and the accuracy of an experiment result is poor; the soil is paved in a color layer manner, so that the interlayer displacement condition of the soil in the up-down direction can be accurately and conveniently known, but the displacement of the soil in the horizontal movement cannot be accurately and conveniently known.
Disclosure of Invention
The invention aims to provide a pile-soil interaction visual anti-interference experimental device and an experimental method capable of preventing soil from entering between a half pile of a model and a side wall of a box body during experiments, and solves the problem that soil is easy to enter between the half pile of the model and the side wall to influence experimental accuracy when the existing half pile mode is used for performing soil interaction experiments.
The second purpose of the invention is to further provide a pile-soil interaction visual anti-interference experimental method capable of reducing the influence of the material adhered with the strain gauge on the elastic modulus of the half pile of the model, and the problem that the accuracy of strain data of the half pile of the model is poor due to the fact that the strain gauge is adhered and fixed in the prior art for measurement is solved.
The third aspect of the invention aims to further provide a pile-soil interaction visual anti-interference experimental method capable of conveniently acquiring soil level and up-down displacement data, and the problem that soil horizontal displacement cannot be accurately acquired when an existing half pile mode is used for performing soil interaction experiments is solved.
The technical problems are solved by the following technical scheme: the utility model provides a visual anti-interference experimental apparatus of stake soil interaction, includes the half stake of model, the displacement sensor of measuring the half stake of model decline volume of box, vertical extension, visual system and the vertical loading device of applying vertical pressure for half stake of model, its characterized in that, the preceding lateral wall of box is transparent organic glass structure, half stake of model is semicircle tubular construction, the circumference both ends of half stake of model are equipped with the turned-up edge, and the preceding lateral wall of box is equipped with about two inner liners, and the inner liner is rigid transparent material preparation, two the inner liner distributes in the left and right sides of half stake of model and presses two on half stake of model in one-to-one the turned-up edge for the turned-up edge butt is on the preceding lateral wall of box, the inner liner is in the same place with the laminating of the preceding lateral wall of box, visual system is taken a picture in order to obtain the removal process of the soil in the box from the place of the preceding lateral wall of box. According to the technical scheme, the position relation between the inner liner and the half model pile and the front side wall can prevent soil from entering between the half model pile and the side wall when the outer drum of the front side wall deforms and the like in the experimental process, so that the half model pile is in contact with soil body for the whole pile in the experimental process, and the experimental accuracy is improved.
Preferably, the end wall of one end of the lining layer far away from the model half pile is abutted with the inner surface of the box body, and a through groove formed between the two lining layers extends vertically. Can guarantee that the model half pile keeps vertical when the box keeps the level.
Preferably, the box body is provided with a supporting leg capable of lifting. The inventive device can be used for packaging the verticality of the model half pile when experiments are carried out in different places.
Preferably, the box body is formed by surrounding a front side wall, a left side wall, a rear side wall, a right side wall and a bottom wall, and the connected side walls are detachably connected together. The box body can be detached for storage and transfer so as to be reused.
Preferably, a strain gauge is stuck on the inner peripheral surface of the model half pile, and the strain gauge are connected together. The data of the model half pile can be measured during the experiment.
Preferably, the inner liner is provided with a pressing raised line extending in the vertical direction at the rear side of the end surface of one end of the model half pile, and the inner liner is pressed on the outward turning edge through the raised line. The inner liner can reliably fix the flanging, the opening area of the hole between the inner liner and the front side wall is small, and the effect of blocking between the soil model half pile and the side wall is better.
The invention also comprises a displacement sensor for measuring the descending amount of the model half pile. The relation between the data stored under the half pile of the model and the soil displacement data can be obtained.
A pile-soil interaction visual anti-interference experimental method comprises the following steps of: adhering strain gauges to the inner peripheral surface of the model half pile; secondly, mounting a model half pile: placing the half pile model into the box body in a mode of vertically arranging and attaching the outward flange to the front side wall of the box body, pressing one ends of the two inner liners on the two inner liners in a one-to-one correspondence manner, and overlapping the other ends of the two inner liners on the front side wall of the box body, wherein a gap is reserved between the lower end of the half pile model and the bottom wall of the box body so as to provide a space for the half pile model to descend when being pressed, and the half pile model is in a vertical state; thirdly, filling soil: filling soil into the box body to a set height, wherein the soil presses the lining layer on the front side wall of the box body and enables the model half pile to be fixed and stored in a vertical state; fourth step, measuring: and applying vertical pressure to the model half pile through the vertical loading device, and recording the value of the vertical pressure, the strain data of the model half pile acquired by the strain gauge, the descending value of the model half pile acquired by the displacement sensor and the displacement change image of the soil acquired by the visualization system.
Preferably, after the strain gauge is installed in the first step, a pressure greater than the maximum value of the vertical pressure in the fourth step is applied to press the model half pile 5 times or more. The method can eliminate the influence of the adhesive layer formed by adhering the strain gauge to the model half pile on the elastic modulus of the model half pile, thereby improving the accuracy of the model half pile strain data measured by experiments. The second object is achieved.
Preferably, the soil filled in the third step is provided with a plurality of rows of colored sand grains distributed along the up-down direction, the colored sand grains in the same row of colored sand grains are distributed along the left-right direction, adjacent colored sand grains are spaced, the colored sand grains are abutted with the inner liner layer, and the color of the soil is different from that of the colored sand grains. The point for detecting the soil displacement can be conveniently selected, so that the measurement data is more accurate. The third object is achieved.
Preferably, the method for abutting the colored sand particles with the inner liner layer comprises the following steps: the inner lining layer is coated with water, colored sand particles are adhered to the inner lining layer through the water, soil is filled into the box body, the colored sand particles are pressed on the inner lining layer through the soil, and then the water on the inner lining layer is dried to lose the adhesion effect on the colored sand particles. The colored sand grains are conveniently and accurately distributed in the soil body.
The invention has the following advantages: the data accuracy of the half pile in pile-soil interaction experiments is improved through the fact that the limited prevention diagram enters between the half pile and the side wall of the model; the influence of the adhered object on the accuracy of the strain data of the model half pile can be reduced; the up-down and horizontal displacement data of the graph can be conveniently and accurately acquired.
Drawings
FIG. 1 is a schematic top view of a pile-soil interaction visual anti-interference experimental device in the experimental process;
FIG. 2 is an enlarged partial schematic view at A of FIG. 1;
FIG. 3 is a schematic front view of a pile-soil interaction visual anti-interference experimental device during experiments;
fig. 4 is a partially enlarged schematic view at B of fig. 3.
In the figure: the box body 1, the model half pile 2, the vertical loading device 3, the front side wall 4, the left side wall 5, the rear side wall 6, the right side wall 7, the bottom wall 8, the angle iron 9, the bolt 10, the nut 11, the flanging 12, the lining layer 13, the pressing raised strips 14, the supporting feet 15 and the colored sand grains 16.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 4, a pile-soil interaction visual anti-interference experimental device comprises a box body 1, a model half pile 2 extending vertically, a visual system (not shown in all figures) and a vertical loading device 3 (also existing device) for applying vertical pressure to the model half pile. The invention also provides a displacement sensor for measuring the descending amount of the model half pile. The box is enclosed by five lateral walls of front lateral wall 4, left lateral wall 5, back lateral wall 6, right lateral wall 7 and diapire 8 altogether. The connected side walls are detachably connected together, specifically, two edges of the angle iron 9 are struck on the outer surfaces of the two adjacent side walls in a one-to-one correspondence manner, and then the angle iron and the side walls are fixed together through bolts 10 and nuts 11 in a matching manner, so that the detachable connection is realized. The half pile of model is semicircle tube structure, and the circumference both ends of half pile of model are equipped with outward flange 12. The front side wall is of a transparent organic glass structure, the front side wall of the box body is provided with two inner liners 13 which are distributed left and right, and the inner liners are made of rigid transparent materials, in particular acrylic. Two inner liners are distributed on the left side and the right side of the model half pile and are pressed on the two outward turnups on the model half pile in a one-to-one correspondence mode, the outward turnups are abutted on the front side wall of the box body, the inner liners are abutted together with the front side wall of the box body in a fitting mode, the end wall of one end of the inner liner far away from the model half pile is abutted together with the inner surface of the box body (namely, the left end of the left inner liner is abutted together with the inner surface of the left side wall, the right end of the right inner liner half is abutted together with the right side wall), a through groove formed between the two inner liners extends vertically, and the model half pile is located in the through groove. The rear side of the end face of the inner liner at one end of the model half pile is provided with a pressing convex strip 14 extending along the up-down direction, and the inner liner is pressed on the outward turning edge through the convex strip. The visualization system is located outside the box body, and the visualization system photographs the interior of the box body from the front of the front side wall of the box body so as to obtain the moving process of soil in the box body. The box is provided with supporting legs 15 which can be lifted and lowered and is used for leveling the box until the model half pile is in a vertical state. Strain gauges are stuck on the inner peripheral surface of the model half pile and are connected with the strain gauges.
The pile-soil interaction visual anti-interference experimental device for the pile-soil interaction visual anti-interference experimental method comprises the following steps of: adhering strain gauges to the inner peripheral surface of the model half pile; secondly, mounting a model half pile: placing the half pile model into the box body in a mode of vertically arranging and attaching the outward flange to the front side wall of the box body, pressing one ends of the two inner liners on the two inner liners in a one-to-one correspondence manner, and overlapping the other ends of the two inner liners on the front side wall of the box body, wherein a gap is reserved between the lower end of the half pile model and the bottom wall of the box body so as to provide a space for the half pile model to descend when being pressed, and the half pile model is in a vertical state; thirdly, filling soil: filling soil into the box body to a set height, wherein the soil presses the lining layer on the front side wall of the box body and enables the model half pile to be fixed and stored in a vertical state; fourth step, measuring: and applying vertical pressure to the model half pile through the vertical loading device, and recording the value of the vertical pressure, the strain data of the model half pile acquired by the strain gauge, the descending value of the model half pile acquired by the displacement sensor and the displacement change image of the soil acquired by the visualization system. After the strain gauge is installed in the first step, a pressure larger than the maximum value of the vertical pressure in the fourth step is applied to press the model half pile for more than 5 times. And in the third step, a plurality of rows of colored sand grains distributed along the up-down direction are arranged in the filled soil, colored sand grains 16 in the same row of colored sand grains are distributed along the left-right direction, adjacent colored sand grains are spaced, the colored sand grains are abutted with the inner liner layer, the color of the soil is different from that of the colored sand grains, and the color of the colored sand grains is preferably red. The method for abutting the colored sand particles and the inner liner layer comprises the following steps: the inner lining layer is coated with water, colored sand particles are adhered to the inner lining layer through the water, soil is filled into the box body, the colored sand particles are pressed on the inner lining layer through the soil, and then the water on the inner lining layer is dried to lose the adhesion effect on the colored sand particles.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the invention, but the present invention is described in detail with reference to the foregoing embodiments, and it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or that equivalents may be substituted for some of the technical features thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a visual anti-interference experimental apparatus of stake soil interaction, includes the half stake of model, the visual system of vertical extension and applies vertical loading device of vertical pressure for half stake of model, its characterized in that, including the displacement sensor of measuring the half stake of model decline volume, the preceding lateral wall of box is transparent organic glass structure, half stake of model is semicircle tube structure, the circumference both ends of half stake of model are equipped with the turned-up edge, and the preceding lateral wall of box is equipped with left and right sides lining, and the lining is rigid transparent material preparation forms, two the lining distributes on the left and right sides of half stake of model and presses two on half stake of model in one-to-one for the turned-up edge butt is on the preceding lateral wall of box, the lining is in the same place with the preceding lateral wall laminating of box, the visual system is taken a picture in order to obtain the removal process of the soil in the box from the place of the preceding lateral wall of box.
2. The pile soil interaction visual anti-interference experimental device according to claim 1, wherein the end wall of one end of the lining layer far away from the model half pile is abutted with the inner surface of the box body, and a through groove formed between the two lining layers extends vertically.
3. The pile soil interaction visual anti-interference experimental device according to claim 2, wherein the box body is provided with supporting legs capable of lifting.
4. A pile soil interaction visual anti-interference experimental device according to claim 1, 2 or 3, wherein the box body is formed by surrounding five side walls, namely a front side wall, a left side wall, a rear side wall, a right side wall and a bottom wall, and the connected side walls are detachably connected together.
5. A pile soil interaction visual anti-interference experimental device according to claim 1, 2 or 3, wherein strain gauges are adhered to the inner peripheral surface of the model half pile, and the strain gauges are connected with the strain gauges.
6. A pile soil interaction visual anti-interference experimental device according to claim 1, 2 or 3, wherein a pressing convex strip extending along the up-down direction is arranged at the rear side of the end face of the inner liner layer positioned at one end of the model half pile, and the inner liner layer is pressed on the outward turning edge through the pressing convex strip.
7. A pile-soil interaction visual anti-interference experimental method suitable for the pile-soil interaction visual anti-interference experimental device according to any one of claims 1 to 6, characterized by comprising the following steps of: adhering strain gauges to the inner peripheral surface of the model half pile; secondly, mounting a model half pile: placing the half pile model into the box body in a mode that the half pile model is vertical and the outward flanges are attached to the front side wall of the box body, pressing one ends of two inner liners on the two outward flanges in a one-to-one correspondence manner, and overlapping the other ends of the two inner liners on the front side wall of the box body, wherein a gap is reserved between the lower end of the half pile model and the bottom wall of the box body so as to provide a space for the half pile model to descend when being pressed, and the half pile model is in a vertical state; thirdly, filling soil: filling soil into the box body to a set height, wherein the soil presses the lining layer on the front side wall of the box body and enables the model half pile to be fixed and stored in a vertical state; fourth step, measuring: and applying vertical pressure to the model half pile through the vertical loading device, and recording the value of the vertical pressure, the strain data of the model half pile acquired by the strain gauge, the descending value of the model half pile acquired by the displacement sensor and the displacement change image of the soil acquired by the visualization system.
8. The pile-soil interaction visual anti-interference experimental method according to claim 7, wherein after the strain gauge is installed in the first step, a pressure greater than the maximum value of the vertical pressure in the fourth step is applied to press the model half pile for more than 5 times.
9. The pile soil interaction visual anti-interference experimental method according to claim 7 or 8, wherein the soil filled in the third step is provided with a plurality of rows of colored sand grains distributed along the up-down direction, the colored sand grains in the same row of colored sand grains are distributed along the left-right direction, adjacent colored sand grains are spaced, the colored sand grains are abutted with the inner liner layer, and the color of the soil is different from that of the colored sand grains.
10. The pile soil interaction visual anti-interference experimental method according to claim 9, wherein the method for abutting the colored sand particles with the inner liner layer is as follows: the inner lining layer is coated with water, colored sand particles are adhered to the inner lining layer through the water, soil is filled into the box body, the colored sand particles are pressed on the inner lining layer through the soil, and then the water on the inner lining layer is dried to lose the adhesion effect on the colored sand particles.
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