CN220978136U - Water filtering structure for pile foundation negative friction resistance test in collapsible loess - Google Patents
Water filtering structure for pile foundation negative friction resistance test in collapsible loess Download PDFInfo
- Publication number
- CN220978136U CN220978136U CN202322716312.XU CN202322716312U CN220978136U CN 220978136 U CN220978136 U CN 220978136U CN 202322716312 U CN202322716312 U CN 202322716312U CN 220978136 U CN220978136 U CN 220978136U
- Authority
- CN
- China
- Prior art keywords
- pile foundation
- collapsible loess
- friction resistance
- water filtering
- resistance test
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 238000012360 testing method Methods 0.000 title claims abstract description 33
- 238000001914 filtration Methods 0.000 title claims abstract description 26
- 238000002474 experimental method Methods 0.000 claims abstract description 49
- 239000002689 soil Substances 0.000 claims abstract description 32
- 238000004062 sedimentation Methods 0.000 description 6
- 238000007599 discharging Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The utility model provides a water filtering structure for a pile foundation negative friction resistance test in collapsible loess, which belongs to the technical field of collapsible loess pile foundation experiments and comprises an experiment box, wherein a yellow soil layer and a water filtering layer are sequentially and horizontally arranged in the experiment box from top to bottom, a plurality of test piles are vertically inserted into the yellow soil layer, a water inlet pipe is arranged at the position of the left side of the experiment box, the inner bottom wall of the experiment box is obliquely arranged, the upper surface of the water filtering layer is kept horizontal, and a plurality of water outlet pipes are arranged at the lowest inclined position of the inner bottom wall of the experiment box.
Description
Technical Field
The utility model belongs to the technical field of collapsible loess pile foundation experiments, and particularly relates to a water filtering structure for a pile foundation negative friction resistance test in collapsible loess.
Background
The pile foundation is laid in the soil body, the upper load acts on the pile end pile soil to generate relative displacement under the general condition, the sedimentation rate of the pile surrounding soil is far smaller than the sedimentation rate of the pile, the side friction resistance born by the pile is upward, namely the pile side friction resistance, however, under certain special conditions, the sedimentation rate of the pile surrounding soil is far greater than the sedimentation rate of the pile, the side friction resistance born by the pile is downward, namely the negative friction resistance, and the negative friction resistance has a serious weakening effect on the pile foundation, and particularly in the collapsible loess area.
The collapsible loess is widely distributed in China, is mainly distributed in most areas of Shanxi, shaanxi and Gansu and in the southwest of yellow river, and is found in most areas of Ningxia, qinghai and Hebei, and has low humidity and high porosity in parts of Xinjiang, shandong, liaoning and the like, and has higher general strength and smaller compressibility when not soaked by water, but after soaked by water, the soil structure can be quickly damaged, larger additional sinking is generated, the strength is quickly reduced, and the pile body damage, uneven sinking of the pile foundation and the like can be caused by the downward drag force generated by the negative frictional resistance of the pile side in pile foundation engineering, so that the safety of a building is seriously influenced.
At present, in an experiment for detecting resistance change of pile foundation negative frictional resistance in collapsible loess, when an experimenter fills a large amount of water in collapsible loess, the experimenter simply sets a water filtering layer to flow redundant water in collapsible loess to the bottom and slowly discharges the redundant water from the bottom, so that the water discharging speed is low after a large amount of water is filled in collapsible loess and flows into the water filtering layer, a large amount of water is deposited at the bottom of collapsible loess, and finally, the data for detecting the settlement displacement and the negative frictional resistance of collapsible loess is inaccurate, thereby affecting the accuracy of an experimental result.
Disclosure of utility model
The utility model aims to provide a water filtering structure for a pile foundation negative friction resistance test in collapsible loess.
In order to achieve the above purpose, the utility model provides a water filtering structure for a pile foundation negative friction resistance test in collapsible loess, which comprises an experiment box, wherein a loess layer and a water filtering layer are sequentially and horizontally arranged in the experiment box from top to bottom, a plurality of test piles are vertically inserted into the loess layer, the lower ends of the test piles are fixed on the middle upper part of the loess layer, a water inlet pipe is arranged at the left side of the experiment box and positioned below the test piles, the inner bottom wall of the experiment box is obliquely arranged, the upper surface of the water filtering layer is kept horizontal, and a plurality of water outlet pipes are positioned at the lowest part of the inclination of the inner bottom wall of the experiment box.
Further, the bottom wall in the experiment box is arranged in a low-right inclined mode.
Furthermore, the middle of the bottom wall in the experiment box is arranged in a high-circumference low-inclination mode.
Furthermore, the middle of the bottom wall in the experiment box is arranged in a low-circumference high-inclination mode.
Furthermore, a plurality of drain holes are uniformly formed in the bottom of the experiment box.
Further, a valve is arranged on the water outlet pipe.
Further, a stress strain sensor is arranged on the test pile.
The utility model has the advantages that: according to the utility model, the bottom of the experiment box is obliquely arranged, so that after a large amount of water is poured into the yellow soil layer and flows into the water filtering layer, the water flow can accelerate along the oblique bottom wall in the experiment box, so that the water can quickly flow to the water outlet pipe for discharging, the water discharging efficiency is improved, the occurrence of the condition that a large amount of water is deposited at the bottom of the yellow soil layer is avoided, inaccurate data of finally detecting the sedimentation displacement and the negative frictional resistance of the yellow soil layer is prevented, and the accuracy of the experimental result of the negative frictional resistance of the pile foundation in the finally collapsible loess is improved.
The utility model will now be described in detail with reference to the drawings and examples.
Drawings
Fig. 1 is a top view of the structure of the present utility model.
Fig. 2 is a schematic view of a first construction of the present utility model.
Fig. 3 is a second construction schematic of the present utility model.
Fig. 4 is a schematic view of a third construction of the present utility model.
Reference numerals illustrate: 1. an experiment box; 2. a layer of yellow soil; 3. a water filtering layer; 4. testing piles; 5. a water inlet pipe; 6. a water outlet pipe; 7. a drain hole; 8. a valve; 9. stress strain sensor.
Detailed Description
The following detailed description, structural features and functions of the present utility model are provided with reference to the accompanying drawings and examples in order to further illustrate the technical means and effects of the present utility model to achieve the predetermined objects.
The following description of the embodiments of the present utility model 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 utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "aligned," "overlapping," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operate in a specific orientation, and therefore should not be construed as limiting the present utility model.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second" may include one or more such features, either explicitly or implicitly; in the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
Example 1
The embodiment provides a pile foundation negative friction resistance test's drainage structure in collapsible loess as shown in fig. 1-4, including experiment case 1, be equipped with yellow soil layer 2 and drainage layer 3 from last to the level in proper order in the experiment case 1, vertical a plurality of test piles 4 of inserting on the yellow soil layer 2, the lower extreme of test pile 4 is fixed in the well upper portion of yellow soil layer 2, the left side of experiment case 1 is located yellow soil layer 2 department and is equipped with inlet tube 5, inlet tube 5 is located test pile 4 below, the interior bottom wall slope setting of experiment case 1, the upper surface of drainage layer 3 keeps the level, still include a plurality of outlet pipes 6, outlet pipe 6 is located the bottom of experiment case 1 interior bottom wall slope.
Further, the bottom wall in the experiment box 1 is arranged in a left-high right-low inclined mode, and the water outlet pipe 6 is fixed at the lower portion of the right side face of the experiment box 1.
Further, the middle of the inner bottom wall of the experiment box 1 is arranged in a high-circumference low-inclination mode, and a plurality of water outlet pipes 6 can be arranged at the circumference of the experiment box 1 and used for rapid water drainage.
Further, the middle of the bottom wall in the experiment box 1 is arranged in a low-circumference high-inclination mode, and the water outlet pipe 6 is buried in the bottom of the experiment box 1 in a hidden mode.
Further, a plurality of drain holes 7 are uniformly formed in the bottom of the experiment box 1, and the drain holes 7 can assist the water filtering layer 3 and the water outlet pipe 6 to play a role in quick drainage.
Further, a valve 8 is arranged on the water outlet pipe 6.
Further, the test pile 4 is provided with a stress-strain sensor 9.
The working process comprises the following steps:
Before an experiment, arranging a yellow soil layer 2 and a water filtering layer 3 in an experiment box 1, sequentially inserting a plurality of test piles 4 on the yellow soil layer 2 according to a quincuncial shape, wherein the distance between every two adjacent test piles 4 is 1.5-2 meters, and then constructing a test site for completing the negative friction resistance detection of the test piles 4 in collapsible loess settlement;
During experiments, the distance measurement and recording are carried out at a height position above the yellow soil layer 2 through a range finder, then a water valve at the water inlet pipe 5 is opened, so that water flows into the yellow soil layer 2 from the water inlet pipe 5, the yellow soil layer 2 is sunk downwards after absorbing the water flowing out, and the stress caused to the test pile 4 in the sinking of the yellow soil layer 2 is taken as an input signal by the stress strain sensor 9 on the test pile 4 and is converted into an output signal to be transmitted to a computer system for recording;
When the water quantity flowing into the yellow soil layer 2 from the water inlet pipe 5 is more, excessive water can permeate downwards in the yellow soil layer 2 and flow into the water filtering layer 3, so that excessive water in the yellow soil layer 2 is firstly separated once through the water filtering layer 3 and flows to the bottom of the experiment box 1, then the water is discharged and concentrated and unified through the water outlet pipe 6, and the next experiment is convenient to recycle, wherein the water at the bottom of the experiment box 1 can flow to the water outlet pipe 6 quickly and flow out from the water outlet pipe 6, and after the excessive water in the yellow soil layer 2 flows into the water filtering layer 3 through the water outlet hole 7 arranged at the bottom of the experiment box 1, the excessive water can flow out from the bottom of the experiment box 1 quickly, so that the water quantity in the experiment box 1 keeps the normal water quantity of the experiment, and the accuracy of the experiment is ensured.
After the measurement data of the stress strain sensor 9 and the measurement data of the range finder are measured and recorded in a computer system, the real-time collected data are simulated through a computer algorithm, and then the simulation test of the negative friction resistance detection of the test pile 4 in collapsible loess settlement is completed.
In summary, the bottom of the experiment box 1 is obliquely arranged, so that after a large amount of water is poured into the yellow soil layer 2 and flows into the water filtering layer 3, the water flow can accelerate along the oblique bottom wall in the experiment box 1, so that the water can quickly flow to the water outlet pipe 6 for discharging, the water discharging efficiency is improved, the occurrence of a large amount of water deposition at the bottom of the yellow soil layer 2 is avoided, inaccurate data of finally detecting sedimentation displacement and negative frictional resistance of the yellow soil layer 2 is prevented, and the accuracy of experimental results of the negative frictional resistance of pile foundations in the finally collapsible loess is improved.
The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.
Claims (7)
1. A wet structure of straining of pile foundation burden friction resistance test in collapsible loess, its characterized in that: including experimental box (1), be equipped with yellow soil layer (2) and drainage layer (3) from last down in proper order level in experimental box (1), vertical inserting is equipped with a plurality of experimental piles (4) on yellow soil layer (2), the lower extreme of experimental pile (4) is fixed the well upper portion of yellow soil layer (2), the left side of experimental box (1) is located yellow soil layer (2) department is equipped with inlet tube (5), inlet tube (5) are located experimental pile (4) below, the interior bottom wall slope setting of experimental box (1), the upper surface of drainage layer (3) keeps the level, still includes a plurality of outlet pipes (6), outlet pipe (6) are located the bottom of bottom wall slope in experimental box (1).
2. The water filtering structure for a negative friction resistance test of pile foundation in collapsible loess as set forth in claim 1, wherein: the left side of the bottom wall in the experiment box (1) is arranged in a low-right inclined manner.
3. The water filtering structure for a negative friction resistance test of pile foundation in collapsible loess as set forth in claim 1, wherein: the middle of the inner bottom wall of the experiment box (1) is arranged in a high-circumference low-inclination mode.
4. The water filtering structure for a negative friction resistance test of pile foundation in collapsible loess as set forth in claim 1, wherein: the middle of the inner bottom wall of the experiment box (1) is low, four sides are high and obliquely arranged.
5. The water filtering structure for a negative friction resistance test of pile foundation in collapsible loess as set forth in claim 1, wherein: a plurality of drain holes (7) are uniformly formed in the bottom of the experiment box (1).
6. The water filtering structure for pile foundation negative friction resistance test in collapsible loess as set forth in claim 5, wherein: the water outlet pipe (6) is provided with a valve (8).
7. The water filtering structure for a negative friction resistance test of pile foundation in collapsible loess as set forth in claim 1, wherein: and a stress-strain sensor (9) is arranged on the test pile (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322716312.XU CN220978136U (en) | 2023-10-10 | 2023-10-10 | Water filtering structure for pile foundation negative friction resistance test in collapsible loess |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322716312.XU CN220978136U (en) | 2023-10-10 | 2023-10-10 | Water filtering structure for pile foundation negative friction resistance test in collapsible loess |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220978136U true CN220978136U (en) | 2024-05-17 |
Family
ID=91060246
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322716312.XU Active CN220978136U (en) | 2023-10-10 | 2023-10-10 | Water filtering structure for pile foundation negative friction resistance test in collapsible loess |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220978136U (en) |
-
2023
- 2023-10-10 CN CN202322716312.XU patent/CN220978136U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20210156107A1 (en) | Bridge Foundation Scouring Monitoring Sensor and Monitoring Data Analysis Method Thereof | |
| CN103898863B (en) | A kind of method studying sediment incipient motion under non-submersion rigid vegetation condition | |
| CN101865739A (en) | Pre-tightening force dynamic monitoring system for pre-stressed anchor bar strengthening project | |
| CN103245391B (en) | Model test apparatus and test method for monitoring dam saturation line | |
| CN203824878U (en) | Test device for simulating seepage prevention of embankment foundation engineering soil | |
| CN105332394A (en) | Testing device for researching resistance of uplift piles on abrupt gush damage mechanism of foundation pits | |
| CN109930580A (en) | Static sounding system and its application method suitable for neritic province domain | |
| CN203249668U (en) | Dam body saturation line monitoring model testing device | |
| CN220978136U (en) | Water filtering structure for pile foundation negative friction resistance test in collapsible loess | |
| CN208486252U (en) | Static sounding system suitable for neritic province domain | |
| CN116086544B (en) | Dam face multiple physical quantity integrated monitoring method and device | |
| CN220978133U (en) | Water delivery structure for pile foundation negative friction resistance test in collapsible loess | |
| CN219200722U (en) | Salt melt type foundation pit water leakage monitoring device | |
| CN205015318U (en) | Domatic hydraulic budget field observation device | |
| CN111351725A (en) | A mold box system for bridge foundation and soil interaction pseudo-static test | |
| CN217810768U (en) | Mud-rock flow ditch bed erodees reduced scale model experimental apparatus | |
| CN201826335U (en) | Pre-tightening force dynamic monitor system of prestressed anchor bolt reinforcement engineering | |
| CN103471978B (en) | Face dam leakage monitoring of structures on deep covering layer | |
| CN220978134U (en) | Negative frictional resistance detection test device for pile foundation in collapsible loess | |
| CN220978135U (en) | Collapsible loess settlement measuring device in pile foundation negative friction resistance test | |
| CN106193139B (en) | A kind of test device of the foundation pit construction to Influence of Pile Foundation that border on the river | |
| CN210439338U (en) | Bored concrete pile concrete pouring height detection device | |
| CN113899341A (en) | River bed deformation monitoring method and device | |
| CN117266270A (en) | Negative friction resistance detection test device and method for pile foundation in collapsible loess | |
| CN113699928B (en) | Test system for simulating erosion of solidified soil in offshore wind power pile construction process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |