CN220188223U - Indoor model test device for researching bearing characteristics of single piles and pile group foundations of red layer foundation by considering groundwater level effect - Google Patents
Indoor model test device for researching bearing characteristics of single piles and pile group foundations of red layer foundation by considering groundwater level effect Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 28
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- 230000005540 biological transmission Effects 0.000 claims abstract description 13
- 238000007405 data analysis Methods 0.000 claims description 10
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- 238000003466 welding Methods 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 12
- 229910052782 aluminium Inorganic materials 0.000 description 12
- 238000004364 calculation method Methods 0.000 description 10
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- 238000001514 detection method Methods 0.000 description 4
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- 238000000034 method Methods 0.000 description 4
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- VGIBGUSAECPPNB-UHFFFAOYSA-L nonaaluminum;magnesium;tripotassium;1,3-dioxido-2,4,5-trioxa-1,3-disilabicyclo[1.1.1]pentane;iron(2+);oxygen(2-);fluoride;hydroxide Chemical compound [OH-].[O-2].[O-2].[O-2].[O-2].[O-2].[F-].[Mg+2].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[Al+3].[K+].[K+].[K+].[Fe+2].O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2.O1[Si]2([O-])O[Si]1([O-])O2 VGIBGUSAECPPNB-UHFFFAOYSA-L 0.000 description 1
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Abstract
The utility model relates to the field of geotechnical engineering, in particular to an indoor model test device for researching bearing characteristics of a single pile and a pile group foundation of a red layer foundation by considering the action of a ground water level. The test device comprises a model box, a model pile, a bearing platform, a loading system, a water supply system and a data acquisition system. Wherein the model box is connected with a water supply system through a transparent drain pipe; in order to ensure that the model box can evenly feed water, the water supply box is arranged in the middle of the model box and is provided with two water inlet channels; the stacking objects, the stacking platform, the counter-force beam, the force transmission cylinder, the backing plate and the jack are sequentially placed from top to bottom in the loading system; the data acquisition instrument transmits the measured data to the computer analysis system for recording and analysis. The test device is simple in structure and convenient to operate, effectively simulates pile foundation bearing characteristics under the condition that underground water level exists, and better analyzes bearing characteristics of single piles and pile group foundations of the red layer foundation under the action of underground water.
Description
Technical Field
The utility model relates to the field of geotechnical engineering, in particular to an indoor model test device for researching bearing characteristics of a single pile and a pile group foundation of a red layer foundation by considering the action of a groundwater level.
Background
Mudstone is susceptible to natural factors such as temperature, rainfall, air, etc., wherein the damage of water to the mudstone structure is most remarkable and irreversible. Physical phenomena such as softening, swelling and mud formation are easy to occur in the process of contacting the mudstone with water, and the mudstone is easy to deform under the action of the series of physical phenomena. The mudstone deformation can cause engineering hidden troubles such as roadbed settlement and the like, and simultaneously, the foundation pit excavation, the foundation stability and the like are influenced. In addition, the red mudstone contains abundant hydrophilic minerals such as illite, montmorillonite and the like, and when the mudstone is immersed in water, the clay minerals in the red mudstone absorb a large amount of water to expand the volume of the rock, so that the foundation of the building is easily displaced. Therefore, the method is one of indispensable links for researching the bearing characteristics of the red mud rock pile foundation under the condition of soaking, and has great significance for preventing engineering potential safety hazards. In the existing research, the research on the bearing characteristics of the red mud rock pile foundation under the action of the underground water level is less.
With the demands of national economy and strategic development, the building industry is in a steadily growing stage, and with the improvement of resident living indexes, higher demands are made on the aspects of residential environment, transportation trip and the like. This makes more and more industrial and civil architecture, public infrastructure, etc. develop towards more specialized direction in the future, and this also puts forward higher demands on the bearing capacity of the foundation, which is indispensible from the type of each layer of soil in the foundation and its physical and mechanical properties.
The red mudstone contains a large amount of hydrophilic minerals, has strong water absorption, and has the characteristics of water absorption expansion, water loss shrinkage and the like. The method aims to ensure the safety and the effectiveness of pile foundation engineering in red-layer areas, solve the problems of low bearing capacity, large deformation and the like of red-layer mudstones under the action of loads, and solve the problems of volume expansion and the like of the red-layer mudstones during water immersion to cause foundation deformation. Meanwhile, the requirements of engineering safety and cost saving are considered or the pile foundation prototype test cannot be smoothly unfolded due to the limitation of site conditions, so that the indoor model test becomes one of effective ways for exploring and solving engineering problems.
Disclosure of Invention
Aiming at the problems, the utility model aims to provide a test device for bearing characteristics of a single pile and a pile group foundation of a red layer foundation in consideration of the action of a ground water level.
The technical scheme of the utility model is as follows: an indoor model test device for researching the bearing characteristics of red layer foundation single piles and pile group foundation taking the action of underground water level into consideration comprises a model box, wherein a mudstone model is placed in the model box, the model box is a steel plate box with an open upper part, the indoor model test device also comprises a pile carrying platform, a counter-force beam, backing plates, force transmission cylinders, single piles, jack jacks, a percentage meter, single pile top backing plates, pile bolsters, model piles, strain gages, miniature load sensors, strong wind mudstones, medium-pressure mudstones, supporting structures, loading hydraulic pumps (separated hydraulic jack, the jack is separated from the pump and communicated with each other through oil pipes), a data acquisition instrument, a data analysis system, a transparent water inlet pipe, a water inlet hole and a pile carrier, the pile carrying platform, the counter-force beam, the backing plates, the force transmission cylinders and the jack form a loading system, the supporting structures are arranged below the model box, the model piles are embedded in the mudstone model, the model piles are divided into pile groups and single piles, the single piles are arranged in a matrix, the single piles are arranged separately, the pile top pile groups are pile top backing plates, the single piles are arranged on the jack jacks, the pile groups are arranged on the jack supports, the jack supports are arranged on the single pile groups, the jack supports, the support beams are arranged on the transparent support cylinder and are arranged on the support cylinder and are connected with the jack supports, the weight is connected with the transparent water inlet pipe, and the water inlet pipe is connected with the transparent jack, and is connected with the loading system through the transparent water inlet pipe, and is connected with the loading platform and is arranged on the transparent jack, and is connected with the loading platform through the transparent jack and is arranged on the foundation layer, and is connected with the transparent jack and is connected with the foundation support layer; strain gauges are arranged on two sides of a pile body of the model pile, waterproof silica gel is coated on the surface of each strain gauge, a miniature load sensor is arranged at the bottom of the pile bottom of the model pile, each strain gauge and each miniature load sensor are connected with a data acquisition instrument, the data acquisition instrument is connected with a data analysis system, and the obtained data are uploaded to the data analysis system. And the dial indicators are symmetrically arranged on two sides of the pile group bearing platform for pile group.
Further: still be provided with water supply system, have support frame, switch valve, supply tank, bearing structure is built on stilts the model case, and the clearance between model case and the ground is used for transparent inlet tube to pass, and the ground is arranged in to the support frame bottom, and the supply tank is placed on the support frame, port connection supply tank on the transparent inlet tube, and switch valve installs on transparent inlet tube. The water supply tank is made of transparent materials, so that the water quantity of the water tank can be conveniently observed. The water pipe provided with two water inlets and connecting the model box and the water supply tank adopts a transparent water pipe, and aims to ensure the uniformity of the water adding rate and ensure that mudstone in the model is soaked uniformly.
Preferably, the number of the water inlets is 2, and the water inlets are uniformly arranged, and the number of the transparent water inlets is matched with the number of the water inlets, so that the mudstone model in the model box is uniformly immersed.
Further: the mudstone model is filled in layers and is divided into strong weathered mudstones on the upper layer and medium weathered mudstones on the lower layer.
Preferably, the number of pile groups is 3×3.
Preferably, the model box is a square box and is formed by welding a bottom plate and four side plates.
The mold box material considers the principle that the influence of the boundary is extremely tiny, ensures that the side wall of the mold box has enough rigidity, controls the side deformation within a certain range, and selects a steel plate. The bottom of the model box is provided with two support structures for supporting the model box to be away from the ground for a certain distance, and the purpose is to enable the transparent water pipe of the water supply system to be conveniently connected.
The model pile is combined with the site prototype pile, an aluminum pipe is adopted for the indoor test model pile according to a similarity theory, and meanwhile, a pile-group bearing platform and a single pile top backing plate are also selected to be aluminum plates.
The utility model has the beneficial effects that: the design is simple, the operation is convenient, the pile body displacement under the load effect and the strain and pile end resistance generated by the pile body displacement can be recorded. The effect of the underground water level is mainly considered, and the water inlet hole is arranged at the bottom of the model box and is connected with the water supply system, so that the rise of the underground water level can be realized, the bearing characteristic of the pile foundation under the effect of the underground water level is discussed, and a feasible method is provided for exploring the influence of the effect of the underground water on the bearing characteristic of the pile foundation in actual engineering. Meanwhile, the utility model can also discuss the bearing characteristics of the pile foundation without considering the action of the underground water level, and can analyze and compare the bearing characteristics of the pile foundation without considering the action of the underground water level and the bearing characteristics of the pile foundation with consideration of the action of the underground water level.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
FIG. 2 is a schematic view of a water supply system of the present utility model;
FIG. 3 is a top view of the mold box of the present utility model;
FIG. 4 is a side view of a mold box of the present utility model;
FIG. 5 is a schematic diagram of the loading structure of the present utility model.
Detailed Description
For a better understanding of the present utility model, the present utility model will be further described with reference to the accompanying drawings.
As shown in fig. 1 to 5, the present model test apparatus includes: pile loading platform 1, counter-force beam 2, backing plate 3, force transmission cylinder 4, jack 5, percentage table 6, single pile top backing plate 7, bearing platform 8, model pile 9, strain gauge 10, miniature load sensor 11, strong weathered mudstone 12, weathered mudstone 13, supporting structure 14, loading hydraulic pump 15, data acquisition instrument 16, data analysis system 17, model box 18, support frame 19, transparent inlet tube 20, switch valve 21, water supply box 22, inlet opening 23, pile loading 24.
The loading system is arranged above the model box and comprises a stacking platform 1, a counter-force beam 2, a base plate 3, a force transmission cylinder 4 and a jack 5. The reaction beam 2 is connected to the center of the bottom surface of the stacking platform 1, and the stacking object 24 is placed on the stacking platform 1 to provide a reaction force. For pile group, the force transmission cylinder 4, the backing plate 3 and the jack 5 are sequentially arranged in the middle above the pile group bearing platform 8; for a single pile, the force transmission cylinder 4, the backing plate 3 and the jack 5 are sequentially arranged above the single pile top backing plate 7.
The water supply system is placed in the front center of the model box 18, in order to be convenient for observing the water level, the water supply box 22 is connected with the water inlet hole 23 through the transparent drain pipe 20, the support structure 14 is installed at the bottom of the model box 18, and a placing space is provided for the transparent drain pipe 20. The number of the water inlets 23 is 2, and the water inlets are uniformly distributed, so that the water can be uniformly soaked; the water supply tank 22 is placed on the support 19, and the transparent drain pipe 20 and the on-off valve 21 aim to control the inflow of water to the model box 18.
The data acquisition system comprises a strain gauge 10, a miniature load sensor 11, a dial indicator 6, a data acquisition instrument 16 and a data analysis system 17. The strain gauge 10 and the miniature load sensor 11 are arranged on the model pile 9, meanwhile, waterproof treatment is carried out, the strain gauge 10 and the miniature load sensor 11 are connected with the data acquisition instrument 16, and the data acquisition instrument 16 is connected with the data analysis system 17; the dial indicators 6 are symmetrically arranged for pile groups, placed on the pile group cap 8 and placed on the single pile top backing plate 7 for single piles.
The model box 18 is filled with the wind-induced mudstone 13 and the strong-wind-induced mudstone 12 respectively, and is filled in layers, and each layer is filled, and a compaction device is used for manual compaction to ensure that the compaction degree meets the design requirement;
after all the components are installed, the stacking object 24 is placed on the stacking platform 1.
The indoor model test device for researching the bearing characteristics of the single pile and the pile group foundation of the red layer foundation without considering the action of groundwater, and the test method comprises the following steps:
1) Determining the similarity ratio of the indoor model test;
2) Simulating red mud rock with different weathering degrees through cement modified soil, wherein the model pile adopts hollow aluminum pipes;
3) Symmetrically mounting a pair of strain gages 10 on the model pile 9 at intervals of 5cm, wherein the precision of the strain gages 10 is 0.1 micro-strain; the bottom of the model pile 9 is provided with a miniature load sensor;
4) Placing mudstones into the model boxes 18 layer by layer, each time one layer is filled, manually tamping the soil layer by using a compaction device, and ensuring the compaction degree of the soil body of each layer; embedding the model pile;
5) A counterforce beam 2, a force transmission cylinder 4, a base plate 3, a jack 5 and a dial indicator 6 are arranged;
6) Applying load to the model step by step according to building foundation pile detection technical specification, and loading the model in 10 stages; each stage of loading takes 1/10 of the estimated limit load value. After each stage of load is applied, the pile top settlement is measured and read once in 5min, 15min, 30min, 45min and 60min after loading, and then is measured and read once every 30 min. The settlement amount of the pile top per half hour is not more than 0.1mm, the settlement is continuously generated for 3 times, the settlement can be considered stable, and the vertical settlement of the pile top, the strain gauge of the pile body and the resistance of the pile end are measured. And then continuing to apply the next stage of load. The pile group and the single pile can apply load simultaneously or independently;
7) The strain gauges 10 are symmetrically arranged on two sides of the model pile 9, and an average value of strain gauge readings on two sides of the model pile 9 can be taken as a strain measurement value of the model pile 9, so that the test precision is improved;
the stress of the measuring point is according to the formula:calculation of
Wherein:-model pile body site stress (Pa);
-model pile body section strain;
-modulus of elasticity (Pa) of the pile body of the model pile;
pile shaft axial force is according to the formula:calculation of
Wherein:-pile shaft axial force (kN);
-pile body cross-sectional area (m 2 ）；
Pile body cross-sectional area is according to the formula:calculation of
Wherein:-hollow aluminium tube outer diameter;
-hollow aluminium tube inner diameter;
pile body side resistance is according to the formula:calculation of
Wherein:-average side friction (kPa) of a section of the pile body unit;
-the difference (kN) between the axial forces of the upper and lower sections of any one unit of the pile body;
-the length (m) of any unit of the pile body;
-hollow aluminium tube wall thickness (m);
pile tip resistance is according to the formula:calculation of
Wherein:-pile tip resistance (kN);
-pile end compressive stress (Pa) measured by pile end load sensor;
pile bottom area (m) 2 ）。
The indoor model test device for researching the bearing characteristics of the single pile and the pile group foundation of the red layer foundation under the action of the underground water level is considered, and the test method comprises the following steps:
1) Determining the similarity ratio of the indoor model test;
2) Simulating red mud rock with different weathering degrees through cement modified soil, wherein the model pile 9 adopts a hollow aluminum pipe;
3) Symmetrically mounting a pair of strain gages 10 on the model pile 9 at intervals of 5cm, wherein the precision of the strain gages 10 is 0.1 micro-strain; the bottom of the model pile 9 is provided with a miniature load sensor 11;
4) The strain gage 10 and the miniature load sensor 11 are subjected to waterproof treatment;
5) Placing mudstones into the model boxes 18 layer by layer, each time one layer is filled, manually tamping the soil layer by using a compaction device, and ensuring the compaction degree of the soil body of each layer; and embedding the model pile 9;
6) A counterforce beam 2, a force transmission cylinder 4, a base plate 3, a jack 5 and a dial indicator 6 are arranged;
7) The model box 18 is filled with water through a transparent water inlet pipe 20, and water is filled in a water head changing mode, so that the water level reaches the designed height; after the water level is stable, load is applied;
8) According to the building foundation pile detection technical specification, loading is applied to the mudstone model step by step, and 10-level loading is carried out; each stage of loading takes 1/10 of the estimated limit load value. After each stage of load is applied, the pile top settlement is measured and read once in 5min, 15min, 30min, 45min and 60min after loading, and then is measured and read once every 30 min. The pile top settlement amount per half hour is not more than 0.1mm, and the settlement is continuously generated for 3 times, so that the settlement is considered stable, and the pile top vertical settlement, the strain measurement and the pile end resistance measurement are carried out. And then continuing to apply the next stage of load. Applying load to pile foundation models considering the action of underground water level, and simultaneously single piles and pile groups;
9) The strain gauges 10 are symmetrically arranged on two sides of the model pile 9, and an average value of strain gauge readings on two sides of the model pile 9 can be taken as a strain measurement value of the model pile 9, so that the test precision is improved;
the stress of the measuring point is according to the formula:calculation of
Wherein:-model pile body site stress (Pa);
-model pile body section strain;
-modulus of elasticity (Pa) of the pile body of the model pile;
pile shaft axial force is according to the formula:calculation of
Wherein:-pile shaft axial force (kN);
-pile body cross-sectional area (m 2 ）；
Pile body cross-sectional area is according to the formula:calculation of
Wherein: d-the outer diameter of the hollow aluminum tube;
d-the inner diameter of the hollow aluminum tube;
pile body side resistance is according to the formula:calculation of
Wherein:-average side friction (kPa) of a section of the pile body unit;
-the difference (kN) between the axial forces of the upper and lower sections of any one unit of the pile body;
-the length (m) of any unit of the pile body;
-hollow aluminium tube wall thickness (m);
pile tip resistance is according to the formula:calculation of
Wherein:-pile tip resistance (kN);
-pile end compressive stress (Pa) measured by pile end load sensor;
area of A-pile bottom (m) 2 ）。
Example 1
In this embodiment, as shown in fig. 1, the mold box 18 is made of steel plate, has a length of 1.8m, a width of 0.6m, and a height of 0.5m, is a cuboid with a closed bottom and an open upper portion, the mold pile 9 is made of hollow aluminum pipe, the mold pile length is 0.4m, the pile diameter is 4cm, the wall thickness is 1cm, the pile group pile cap dimensions are 400mm×400mm×10mm, the pile group pile cap 8 is made of aluminum plate, and the pile group pile cap bottom and the mold pile top are bonded (or welded) with strong glue. Firstly, symmetrically installing strain gauges 10 on the lateral wall of the outer side of a model pile 9, installing miniature load sensors 11 at the bottom of the model pile, then placing the model pile 9 into a model box 18, connecting the strain gauges 10 and the miniature load sensors 11 with a data acquisition instrument 16, secondly, respectively filling the model box with medium-weathered mudstone 13 and strong-weathered mudstone 12, respectively, wherein the layer thicknesses are 0.2m and 0.3m, and tamping each layer of filled soil to achieve the designed compactness. And then a loading system is installed, the counter-force beam 2, the force transmission cylinder 4, the backing plate 3 and the jack 5 are sequentially and respectively placed at the center of the pile group bearing platform 8 and the center of the single pile top backing plate 7, and finally the data acquisition instrument 16 is connected with the data analysis system 17.
And then, based on the device, carrying out pile foundation bearing characteristic test under the vertical load according to building foundation pile detection technical specification.
Example 2
The indoor model test device taking the pile foundation bearing characteristics of the groundwater level into consideration in this embodiment is additionally provided with a water supply system on the basis of embodiment 1. In this embodiment, in order to achieve the rising of the groundwater level, the transparent water inlet pipe 20 is installed at the bottom of the model box 18, and in order to facilitate the connection of the transparent water inlet pipe 20 and the reserved water inlet hole 23 at the bottom of the model box 18, the model box 18 is placed on the supporting structure 14; the water supply tank 22 is placed on the support 19, and in order to make the model box evenly water, the water inlet holes 23 are reserved at the bottom of the model box 18 and symmetrically arranged, and the water supply system is placed in the center in front of the model box 18.
And then, based on the device, carrying out pile foundation bearing characteristic test under the vertical load according to building foundation pile detection technical specification.
Claims (6)
1. Consider red layer foundation mono pile and group pile foundation bearing characteristic study's of groundwater level effect indoor model test device, including model case (18), place the mudstone model in model case (18), model case (18) are the open steel sheet system box in upper portion, its characterized in that: the pile-up device also comprises a pile-up platform (1), a counter-force beam (2), a backing plate (3), a force transmission cylinder (4), a jack (5), a dial indicator (6), a single pile top backing plate (7), a pile group bearing platform (8), model piles (9), a strain gauge (10), a miniature load sensor (11), strong weathered mudstones (12), medium weathered mudstones (13), a supporting structure (14), a loading hydraulic pump (15), a data acquisition instrument (16), a data analysis system (17), a transparent water inlet pipe (20), a water inlet hole (23), a pile-up object (24), the pile-up platform (1), the counter-force beam (2), the backing plate (3), the force transmission cylinder (4) and the jack (5), wherein the supporting structure (14) is arranged below the model boxes (18), the model piles (9) are embedded in the mudstone model, the model piles (9) are respectively arranged in a matrix, the pile group piles and are arranged, the pile group bearing platform (7) is arranged above the pile group piles, the pile top backing plate (8), the pile top backing plate (7) is arranged above the pile group bearing platform, the pile top backing plate (8), the pile top is arranged above the jack (3), the jack (5) is arranged above the jack (3), a counterforce beam (2) is arranged on the force transmission cylinder (4), the counterforce beam (2) is connected with a stacking platform (1), a stacking object (24) is placed on the stacking platform (1), a water inlet hole (23) is formed in the bottom of the model box (18), the water inlet hole (23) is communicated with a transparent water inlet pipe (20), the transparent water inlet pipe (20) is communicated with a water source, and a loading hydraulic pump (15) is connected with a jack (5); the strain gauge (10) is arranged on the outer side of a pile body of the model pile (9), the miniature load sensor (11) is arranged at the bottom of the pile bottom of the model pile (9), the strain gauge (10) and the miniature load sensor (11) are connected with the data acquisition instrument (16), the data acquisition instrument (16) is connected with the data analysis system (17), and the obtained data is uploaded to the data analysis system (17).
2. The indoor model test device for researching bearing characteristics of single piles and pile group foundations of red layer foundation taking groundwater level action into consideration as set forth in claim 1, wherein: still be provided with water supply system, there are support frame (19), switch valve (21), supply tank (22), bearing structure (14) are built on stilts model case (18), the clearance between model case (18) and ground is used for transparent inlet tube (20) to pass, place ground in support frame (19) bottom, supply tank (22) are placed on support frame (19), port connection supply tank (22) on transparent inlet tube (20), switch valve (21) are installed on transparent inlet tube (20).
3. The indoor model test device for researching bearing characteristics of single piles and pile group foundations of red layer foundation taking groundwater level action into consideration as set forth in claim 2, wherein: the number of the water inlet holes (23) is 2, and the water inlet holes are uniformly distributed, and the number of the transparent water inlet pipes (20) is matched with the number of the water inlet holes (23), namely 2, so that the mudstone model in the model box (18) is uniformly immersed in water.
4. The indoor model test device for researching bearing characteristics of single piles and pile group foundations of red layer foundation taking groundwater level action into consideration as set forth in claim 1, wherein: the mudstone model is filled in layers and is divided into strong weathered mudstone (12) at the upper layer and medium weathered mudstone (13) at the lower layer.
5. The indoor model test device for researching bearing characteristics of single piles and pile group foundations of red layer foundation taking groundwater level action into consideration as set forth in claim 1, wherein: the number of group piles is 3×3.
6. The indoor model test device for researching bearing characteristics of single piles and pile group foundations of red layer foundation taking groundwater level action into consideration as set forth in claim 1, wherein: the model box (18) is a square box and is formed by welding a bottom plate and four side plates.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320979573.8U CN220188223U (en) | 2023-04-26 | 2023-04-26 | Indoor model test device for researching bearing characteristics of single piles and pile group foundations of red layer foundation by considering groundwater level effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320979573.8U CN220188223U (en) | 2023-04-26 | 2023-04-26 | Indoor model test device for researching bearing characteristics of single piles and pile group foundations of red layer foundation by considering groundwater level effect |
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| CN220188223U true CN220188223U (en) | 2023-12-15 |
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| CN202320979573.8U Active CN220188223U (en) | 2023-04-26 | 2023-04-26 | Indoor model test device for researching bearing characteristics of single piles and pile group foundations of red layer foundation by considering groundwater level effect |
Country Status (1)
| Country | Link |
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| CN (1) | CN220188223U (en) |
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2023
- 2023-04-26 CN CN202320979573.8U patent/CN220188223U/en active Active
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