CN215726704U - Water level rising and falling pile-soil stress deformation model test system - Google Patents
Water level rising and falling pile-soil stress deformation model test system Download PDFInfo
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- CN215726704U CN215726704U CN202121897044.0U CN202121897044U CN215726704U CN 215726704 U CN215726704 U CN 215726704U CN 202121897044 U CN202121897044 U CN 202121897044U CN 215726704 U CN215726704 U CN 215726704U
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Abstract
The utility model discloses a water level rising and falling pile-soil stress deformation model test system which comprises a concrete model groove, a water storage pipe, a water measuring pipe, a concrete pile, a model groove power loading system and a settlement measuring pipe. The concrete mold groove is filled with natural sand, and a plurality of pore water pressure measuring sensors are buried in the natural sand. The water storage pipe, the water measuring pipes, the concrete pile and the settlement measuring pipe are all inserted into natural sand. The water pump is installed in the water storage pipe, and a water level measuring buoy is inserted into the water measuring pipe. The lower end face of the concrete pile is provided with a soil pressure measuring sensor, and the side wall of the concrete pile is provided with a plurality of optical fiber strain sensors. And the model groove power loading system is respectively contacted with the upper ends of the concrete piles. The system is suitable for measuring the mechanical characteristics of the pile body under the condition that the water level needs to be manually controlled to change along with time, and is provided for design and researchers to carry out relevant model test researches.
Description
Technical Field
The utility model relates to a water level rising and falling pile-soil stress deformation model test system.
Background
In recent decades, the construction and development of reservoirs have been fast. After the reservoir is built, the reservoir circularly stores and discharges water, namely, the water level in the reservoir continuously rises along with the water storage of the reservoir; during the discharge phase of the reservoir, the water level in the reservoir will gradually decrease. According to the natural law and the water storage requirement of the reservoir, the water level of the reservoir changes regularly along with the time in one year. In the process of water level change in the reservoir, the soil body state in the water level change range is mutually converted between saturated soil and unsaturated soil along with the water level change, so that the stress state of the soil body is correspondingly changed, and the relevant mechanical properties of the foundation part of a building in the soil body are changed. Particularly, when the soil body moves relatively along with the rise and fall of the water level, the soil body and the pile body generate relative displacement, so that the axial force of the pile body and the negative frictional resistance of the pile side change greatly along with the change of the water level, a series of engineering problems such as yield or damage of a pile end foundation, damage of the pile body, uneven settlement of an upper structure and the like can be caused, and serious potential safety hazards are brought to an engineering structure.
The evolution process of such problems in the prior art is not clear, and the design of the test is lack of reference, so that a test system capable of solving the problems is needed.
Disclosure of Invention
The utility model aims to provide a water level rising and falling pile-soil stress deformation model test system to solve the problems in the prior art.
The technical scheme adopted for achieving the purpose of the utility model is that the water level rising and falling pile-soil stress deformation model test system comprises a concrete model groove, a water storage pipe, a water measuring pipe, a concrete pile, a model groove power loading system and a settlement measuring pipe.
The concrete mold groove is a rectangular box body which is hollow inside and has an opening at the upper end, natural sand is filled in the concrete mold groove, and a plurality of pore water pressure measuring sensors are buried in the natural sand.
The lower ends of the water storage pipes and the water measuring pipes are inserted into natural sand and vertically contacted with the bottom of the concrete model groove, and the upper ends of the water storage pipes and the water measuring pipes extend out of the natural sand.
The upper end and the lower end of the water storage pipe are both open, the water pump is installed in the water storage pipe and is close to the lower end of the water storage pipe, and the water pump is communicated with a water tank outside the concrete mold groove through a water pipe.
The upper end and the lower end of each water measuring pipe are both opened, and a water level measuring buoy is inserted into each water measuring pipe.
A plurality of natural sand is all inserted to the lower extreme of concrete pile and the lower extreme of a plurality of settlement survey buret, and there is the clearance in the lower extreme of concrete pile and the lower extreme of settlement survey buret and the bottom in concrete mould groove, and natural sand is all stretched out to the upper end of concrete pile and the upper end of settlement survey buret.
Concrete pile and settlement survey buret all are perpendicular to the bottom in concrete model groove, and the lower terminal surface of concrete pile is provided with the soil pressure measurement sensor, is provided with a plurality of optic fibre strain sensor meters on the lateral wall of concrete pile.
And the model groove power loading system is respectively contacted with the upper ends of the concrete piles.
Further, the water level measurement buoy comprises a graduated scale and a base connected to the lower end of the graduated scale, and the graduated scale and the base are both made of materials with density smaller than that of water.
Furthermore, the water storage pipe and the water measuring pipe are respectively positioned on two opposite corners of the concrete mold groove.
Furthermore, a plurality of concrete piles are arranged in a matrix mode, and the two settlement measuring pipes are located on two sides of a pile group structure formed by the concrete piles respectively.
Furthermore, a plurality of groups of sensors are arranged on the side wall of the concrete pile and are arranged at equal intervals along the axial direction of the concrete pile.
Each group of the sensors comprise two optical fiber strain sensors, and the two optical fiber strain sensors in the same group are located on the same horizontal plane and are arranged at equal intervals along the circumferential direction of the concrete pile.
The method has the advantages that undoubtedly, a series of pile body data measurement researches in the water level circulation lifting process of the reservoir can be developed, the understanding of the measurement technology of the pile body in the water level lifting process is deepened, the pile body mechanical characteristic data in the water level lifting process can be measured more conveniently and accurately, and model test basis and data theoretical support are provided for building and monitoring of a building foundation part in the reservoir.
Drawings
FIG. 1 is a schematic view of a system according to the present invention;
FIG. 2 is a top view of the system of the present invention;
FIG. 3 is a schematic view of a water pump;
fig. 4 is a schematic view of a water level measuring float.
In the figure: the concrete model groove is 1, the natural sand 2, the water storage pipe 3, the water pump 4, the water measuring pipe 5, the water level measuring buoy 6, the graduated scale 601, the base 602, the concrete pile 7, the model groove power loading system 8, the settlement measuring pipe 9, the soil pressure measuring sensor 10, the pore water pressure measuring sensor 11 and the optical fiber strain sensor 12.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the utility model and the scope of the utility model is covered by the present invention according to the common technical knowledge and the conventional means in the field.
Example 1:
the embodiment discloses a water level rising and falling pile-soil stress deformation model test system which comprises a concrete model groove 1, a water storage pipe 3, a water measuring pipe 5, a concrete pile 7, a model groove power loading system 8 and a settlement measuring pipe 9.
Referring to fig. 1, the concrete mold groove 1 is a rectangular box body with a hollow interior and an open upper end, natural sand 2 is filled in the concrete mold groove 1, and a plurality of pore water pressure measuring sensors 11 are embedded in the natural sand 2. The natural sandy soil 2 is directly extracted from the site or sandy soil with similar physical parameters to the site sandy soil is selected, and the pore water pressure measuring sensor 11 is used for measuring the pore water pressure and the continuous change rule thereof in real time and judging the water level change trend.
The lower ends of the water storage pipes 3 and the water measuring pipes 5 are all inserted into the natural sand 2 and vertically contacted with the bottom of the concrete mold groove 1, and the upper ends of the water storage pipes 3 and the water measuring pipes 5 extend out of the natural sand 2. Referring to fig. 2, in the present embodiment, the number of the water measuring pipes 5 is 2, and the water storage pipes 3 and one water measuring pipe 5 are respectively located at two opposite corners of the concrete mold 1.
The upper end and the lower end of the water storage pipe 3 are both open, the water pump 4 is arranged in the water storage pipe 3 and close to the lower end of the water storage pipe 3, and the water pump 4 is communicated with a water tank outside the concrete mold groove 1 through a water pipe. Referring to fig. 3, which is a schematic diagram of the water pump 4, the water pump 4 can drain and absorb water into the water storage pipe 3, and control the extraction and suction of the water level in real time to achieve the purpose of manually and synchronously controlling the water level lifting condition, and before the test, the water level is timely controlled to be extracted and sucked to reach the bottom end of the water storage pipe 3 by referring to the planned flow of the water level lifting time and the data in the water measuring pipe 5 observed in real time, so that the external water is fully filled or extracted from the whole mold groove, and the purpose of controlling the water level in real time is completely achieved.
The upper end and the lower end of each water measuring pipe 5 are both open, and a water level measuring buoy 6 is inserted into each water measuring pipe 5. Referring to fig. 4, the water level measuring buoy 6 includes a scale 601 and a base 602 connected to a lower end of the scale 601, and the scale 601 and the base 602 are made of a material having a density less than that of water. The water storage pipe 3 and the water measuring pipe 5 are both PVC pipes, and the diameter of the water storage pipe 3 is larger. The water level measuring buoy 6 can be used for observing and recording the specific position of the water level in the soil body in real time through the numbers displayed by the graduated scale exposing the water measuring pipe.
Many natural sand 2 is all inserted to the lower extreme of concrete pile 7 and the lower extreme of many settlement survey buret 9, and there is the clearance in the lower extreme of concrete pile 7 and the lower extreme of settlement survey buret 9 and the bottom of concrete model groove 1, and natural sand 2 all stretches out in the upper end of concrete pile 7 and the upper end of settlement survey buret 9.
Referring to fig. 2, in the present embodiment, the number of the concrete piles 7 is 4, 4 concrete piles 7 are arranged in a matrix, and two settlement measuring pipes 9 are respectively located at two sides of a pile group structure formed by the concrete piles 7.
Referring to fig. 1, a plurality of sets of sensors are arranged on the side wall of the concrete pile 7, and the plurality of sets of sensors are arranged at equal intervals along the axial direction of the concrete pile 7. Each group of the sensors comprises two optical fiber strain sensors 12, and the two optical fiber strain sensors 12 in the same group are located on the same horizontal plane and are arranged at equal intervals along the circumferential direction of the concrete pile 7.
And the model groove power loading system 8 is respectively contacted with the upper ends of the concrete piles 7.
When the water storage pipes 3 and the water measuring pipes 5 are installed, the concrete mold groove 1 is emptied, the water storage pipes 3 and the water measuring pipes 5 are positioned to the calibration positions, the vertical perpendicular to the bottom surface of the water storage pipes is ensured, natural sand 2 is filled into the concrete mold groove 1 layer by layer, and the filling height of each layer is 20-30 cm each time. When the filled natural sand 2 reaches the installation height of the concrete pile 7 and the settlement measuring tube 9, the concrete pile 7 and the settlement measuring tube 9 are sequentially positioned to a calibration position, the concrete pressure measuring sensor 10 is installed at the center of the bottom of the concrete pile 7, after the concrete pile 7 and the settlement measuring tube 9 are ensured to be vertically perpendicular to the bottom surface of the concrete mold groove 1, the natural sand 2 is continuously filled in the concrete mold groove 1 in a layered mode, the filling height is 20-30 cm each time, and in the process of filling the natural sand 2, the calibration height of the calibration position is noticed, and the pore water pressure measuring sensor 11 is installed. And finally, in the whole sand filling process, ensuring that the water storage pipe 3, the water measuring pipe 5, the concrete pile 7 and the settlement measuring pipe 9 are always kept vertical and vertical, and stopping filling when the filling height of the natural sandy soil 2 reaches the height required by the experiment.
During testing, the model test similarity ratio is determined according to actual engineering conditions and the size of the concrete model groove 1, and the length, the cross section size, the soil body material, the strength and the like of the concrete pile 7 required by the model test are calculated and judged. And converting the top load of various working conditions required to be applied by the model slot power loading system 8 according to the determined similarity ratio. And determining the quantity and the positions of the water measuring pipe 5, the concrete pile 7, the settlement measuring pipe 9, the pore water pressure measuring sensor 11 and the optical fiber strain sensor 12. When the number and the position of the concrete piles 7 are determined, the soil pressure measuring sensor 10 can be determined, and the number of the water measuring pipes 5 can be determined to determine the number of the water level measuring buoys 6. And finally, drawing the positions of all the experimental instruments. And then preparing the natural sand 2 used for the test, pouring a concrete pile 7, installing optical fiber strain sensors 12 at two sides of a pile body after the concrete pile 7 is cured, cleaning the mold groove and preparing all sensors and data connecting devices thereof. And arranging and installing all equipment and related data transmission equipment according to a drawing, wherein the natural sandy soil 2 is filled in a layer-by-layer filling mode in the arrangement process. And after the water storage pipe 3 and the water measuring pipe 5 are installed, the water pump 4 and the water level measuring buoy 6 are respectively placed into the corresponding pipes. After the concrete pile 7 is fixed, a model groove power loading system 8 is installed on the upper part of the pile body. And connecting various sensors to the acquisition instrument terminal. And (3) scaling the annual change rule of the water level of the reservoir on site to a reasonable range in an equal scale, for example, scaling the time unit of the water level change on site from 'month' to 'hour' in the model tank experiment, simulating the water level change of the reservoir for one year into the water level change of the model tank for 12 hours, and drawing a curve to facilitate the control of the work of the water pump 4. And debugging the sensor, the water pump 4 and the model tank power loading system 8, starting loading after normal operation, after the model tank power loading system 8 finishes loading, starting pumping and draining water by the water pump 4 according to the pre-planned water level change trend, and monitoring the water level change condition in real time through the position change of the water level measuring buoy 6 in the water measuring pipe 5 in the process of pumping and draining water so as to accurately guarantee the experimental process. Finally, analyzing the experimental data to obtain the change rule of various data of the pile body under the water level fluctuation condition and the settlement change rule of the soil body under the water level fluctuation condition, and forming a test report example 2:
the embodiment discloses a water level rising and falling pile-soil stress deformation model test system which comprises a concrete model groove 1, a water storage pipe 3, a water measuring pipe 5, a concrete pile 7, a model groove power loading system 8 and a settlement measuring pipe 9.
Referring to fig. 1, the concrete mold groove 1 is a rectangular box body with a hollow interior and an open upper end, natural sand 2 is filled in the concrete mold groove 1, and a plurality of pore water pressure measuring sensors 11 are embedded in the natural sand 2.
The lower ends of the water storage pipes 3 and the water measuring pipes 5 are all inserted into the natural sand 2 and vertically contacted with the bottom of the concrete mold groove 1, and the upper ends of the water storage pipes 3 and the water measuring pipes 5 extend out of the natural sand 2.
The upper end and the lower end of the water storage pipe 3 are both open, the water pump 4 is arranged in the water storage pipe 3 and close to the lower end of the water storage pipe 3, and the water pump 4 is communicated with a water tank outside the concrete mold groove 1 through a water pipe. Referring to fig. 3, the water pump 4 is schematically illustrated.
The upper end and the lower end of each water measuring pipe 5 are both open, and a water level measuring buoy 6 is inserted into each water measuring pipe 5.
Many natural sand 2 is all inserted to the lower extreme of concrete pile 7 and the lower extreme of many settlement survey buret 9, and there is the clearance in the lower extreme of concrete pile 7 and the lower extreme of settlement survey buret 9 and the bottom of concrete model groove 1, and natural sand 2 all stretches out in the upper end of concrete pile 7 and the upper end of settlement survey buret 9.
And the model groove power loading system 8 is respectively contacted with the upper ends of the concrete piles 7.
Example 3:
the main structure of this embodiment is the same as that of embodiment 2, and further, referring to fig. 4, the water level measuring buoy 6 includes a graduated scale 601 and a base 602 connected to the lower end of the graduated scale 601, and both the graduated scale 601 and the base 602 are made of a material having a density lower than that of water.
Example 4:
the main structure of this embodiment is the same as that of embodiment 2, and further, referring to fig. 2, the water storage pipe 3 and a water measuring pipe 5 are respectively located at two opposite corners of the concrete mold 1.
Example 5:
the main structure of this embodiment is the same as that of embodiment 2, and further, referring to fig. 2, a plurality of concrete piles 7 are arranged in a matrix, and two settlement measuring pipes 9 are respectively located on both sides of a pile group structure formed by the plurality of concrete piles 7.
Example 6:
the main structure of this embodiment is the same as that of embodiment 2, and further, referring to fig. 1, a plurality of sets of sensors are disposed on the side wall of the concrete pile 7, and the plurality of sets of sensors are arranged at equal intervals along the axial direction of the concrete pile 7.
Each group of the sensors comprises two optical fiber strain sensors 12, and the two optical fiber strain sensors 12 in the same group are located on the same horizontal plane and are arranged at equal intervals along the circumferential direction of the concrete pile 7.
Claims (5)
1. A water level rises and falls stake-soil atress deformation model test system that falls, its characterized in that: comprises a concrete model groove (1), a water storage pipe (3), a water measuring pipe (5), a concrete pile (7), a model groove power loading system (8) and a settlement measuring pipe (9);
the concrete molding groove (1) is a rectangular box body which is hollow inside and is provided with an opening at the upper end, natural sand (2) is filled in the concrete molding groove (1), and a plurality of pore water pressure measuring sensors (11) are embedded in the natural sand (2);
the lower ends of the water storage pipes (3) and the water measuring pipes (5) are inserted into the natural sand (2) and vertically contacted with the bottom of the concrete mold groove (1), and the upper ends of the water storage pipes (3) and the water measuring pipes (5) extend out of the natural sand (2);
the upper end and the lower end of the water storage pipe (3) are both open, the water pump (4) is arranged in the water storage pipe (3) and close to the lower end of the water storage pipe (3), and the water pump (4) is communicated with a water tank outside the concrete mold groove (1) through a water pipe;
the upper end and the lower end of each water measuring pipe (5) are open, and a water level measuring buoy (6) is inserted into each water measuring pipe (5);
the lower ends of the concrete piles (7) and the lower ends of the sedimentation measuring pipes (9) are inserted into the natural sand (2), gaps exist between the lower ends of the concrete piles (7) and the lower ends of the sedimentation measuring pipes (9) and the bottom of the concrete mold groove (1), and the upper ends of the concrete piles (7) and the upper ends of the sedimentation measuring pipes (9) extend out of the natural sand (2);
the concrete pile (7) and the settlement measuring tube (9) are both vertical to the bottom of the concrete mold groove (1), a concrete pressure measuring sensor (10) is arranged on the lower end face of the concrete pile (7), and a plurality of optical fiber strain sensors (12) are arranged on the side wall of the concrete pile (7);
and the model groove power loading system (8) is respectively contacted with the upper ends of the concrete piles (7).
2. The water level rising and falling pile-soil stress deformation model test system as claimed in claim 1, wherein: the water level measuring buoy (6) comprises a graduated scale (601) and a base (602) connected to the lower end of the graduated scale (601), and the graduated scale (601) and the base (602) are both made of materials with density smaller than that of water.
3. The water level rising and falling pile-soil stress deformation model test system as claimed in claim 1, wherein: the water storage pipe (3) and the water measuring pipe (5) are respectively positioned on two opposite corners of the concrete model groove (1).
4. The water level rising and falling pile-soil stress deformation model test system as claimed in claim 1, wherein: a plurality of concrete pile (7) are arranged in a matrix, and two settlement measuring pipes (9) are respectively positioned on two sides of a pile group structure formed by the concrete piles (7).
5. The water level rising and falling pile-soil stress deformation model test system as claimed in claim 1, wherein: a plurality of groups of sensors are arranged on the side wall of the concrete pile (7) and are arranged at equal intervals along the axial direction of the concrete pile (7);
each group of the sensors comprises two optical fiber strain sensors (12), and the two optical fiber strain sensors (12) in the same group are located on the same horizontal plane and are arranged at equal intervals along the circumferential direction of the concrete pile (7).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115112485A (en) * | 2022-06-22 | 2022-09-27 | 中国水利水电科学研究院 | Soil strength, deformation characteristic and seepage characteristic integrated detection device |
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2021
- 2021-08-13 CN CN202121897044.0U patent/CN215726704U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115112485A (en) * | 2022-06-22 | 2022-09-27 | 中国水利水电科学研究院 | Soil strength, deformation characteristic and seepage characteristic integrated detection device |
| CN115112485B (en) * | 2022-06-22 | 2023-03-31 | 中国水利水电科学研究院 | Soil strength, deformation characteristic and seepage characteristic integrated detection device |
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