CN106644841B - Analogue test device of research underground construction engineering piping phenomenon - Google Patents
Analogue test device of research underground construction engineering piping phenomenon Download PDFInfo
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- CN106644841B CN106644841B CN201710095055.9A CN201710095055A CN106644841B CN 106644841 B CN106644841 B CN 106644841B CN 201710095055 A CN201710095055 A CN 201710095055A CN 106644841 B CN106644841 B CN 106644841B
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
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Abstract
The invention provides a simulation test device for researching a piping phenomenon of an underground building engineering, which comprises a test box body, a vertical pressurizing device for applying pressure to a soil sample in the test box body, an intelligent water head control system based on a single chip microcomputer and a microscopic observation device, wherein a water inlet pipe is arranged on the left side of the upstream of the test box body and is connected with the intelligent water head control system based on the single chip microcomputer through a water inlet valve, and a water outlet pipe is arranged on the right side of the downstream of the test box body; the top of the test box body is sealed by an organic glass cover plate, a plurality of piping openings are formed in the surface of the organic glass cover plate along the upstream to the downstream and are plugged by rubber plugs, and a flow velocity meter is installed at the piping openings and the water inlet pipe. The test device for simulating soil body damage under the piping effect can adjust the water head gradient and the seepage path length according to the requirement, so that the test device is more practical, and can measure the piping phenomenon of the soil body under different water flow speeds, different seepage path lengths and different vertical pressures.
Description
Technical field:
the invention belongs to a test device for piping phenomenon, and particularly relates to a simulation test device for researching the piping phenomenon of underground construction engineering.
The background technology is as follows:
with more and more high-rise buildings and super high-rise buildings, corresponding underground projects such as foundation pits and the like are deeper and deeper. When the foundation pit is supported, the underground water level in the foundation pit is often required to be reduced by adopting methods such as well-point dewatering, so that the water heads inside and outside the foundation pit are greatly different, and the possibility of seepage deformation of the foundation pit is artificially increased. Infiltration is a process of forming water seepage due to imbalance of groundwater pressure, and infiltration causes displacement of sand particles, which is generally divided into: four damage forms of flowing soil, piping, contact flushing and contact loss show that the foundation pit piping is the greatest in damage by a large amount of data. In order to ensure the construction safety of underground engineering, the problem of seepage damage such as piping is generally focused on in academia and engineering community. In order to study the piping mechanism, a test device for simulating the dynamic development of piping erosion is needed, the data obtained by the existing piping test device is single, and the related study on piping phenomenon of soil under different pressures is lacking. Therefore, the novel test device is urgently needed to be provided, conditions and processes of soil body piping development can be truly simulated, evolution of soil body mesostructure, waterpower and mechanical characteristics in the piping development process can be monitored in real time, and various data related to piping can be measured simultaneously, so that corresponding rules can be obtained through comparative research, and reliable basis is provided for deep research on piping mechanism.
The invention comprises the following steps:
aiming at the defects of the prior art, the invention provides a simulation test device capable of simultaneously measuring various related data of the piping phenomenon of underground construction engineering.
The invention adopts the following technical scheme: the simulation test device for researching the piping phenomenon of the underground construction engineering comprises a test box body, a vertical pressurizing device for applying pressure to a soil sample in the test box body, an intelligent water head control system based on a single chip microcomputer and a microscopic observation device, wherein a water inlet pipe is arranged on the left side of the upstream of the test box body and is connected with the intelligent water head control system based on the single chip microcomputer through a water inlet valve, and a water outlet pipe is arranged on the right side of the downstream of the test box body; the upstream part in the test box body is provided with a water permeable plate at intervals to form a water inlet chamber and a soil sample accommodating chamber, the front side wall of the test box body corresponding to the soil sample accommodating chamber is provided with a plurality of water permeable holes which are regularly arranged, the top of the test box body is sealed by an organic glass cover plate, a plurality of piping openings are formed in the surface of the organic glass cover plate along the upstream to the downstream and are plugged by rubber plugs, and a flow velocity meter is installed at the piping openings and the water inlet pipe.
The intelligent water head control system based on the singlechip comprises a water head lifting device, a motor for controlling the water head lifting device and a control box for controlling the motor, and a water outlet of a water tank in the water head lifting device is connected with the water inlet pipe.
The microscopic observation device consists of an Olympic Basbody microscope with a magnification of 10-220 times and a CCD camera.
The vertical pressurizing device comprises a base and a multi-stage hydraulic cylinder fixed on the base, the test box body is arranged on the base, the multi-stage hydraulic cylinder acts on the organic glass cover plate to pressurize the soil sample step by step, and the pressurizing of each stage is controlled to be 0.1-0.2 kPa.
The outer side walls of the test box body are all organic glass plates.
The piping openings are distributed at equal intervals.
And a sand bearing disc is arranged at the piping opening.
Compared with the prior art, the invention has the following advantages: the simulation test device for researching the piping phenomenon of the underground construction engineering has the advantages that the simulated water flow speed, the seepage path length and the vertical pressure borne by the soil body in the test process are controllable, various related data of the piping phenomenon can be measured simultaneously, the influence degree of the critical speed and the seepage path length on the piping when the soil body is subjected to piping is observed, and the influence of the water flow speed on the particle loss is obtained; analyzing the change rule of piping critical speed of the soil body under different pressures; the change rule of critical particle size under different flow rates and the particle size proportion of piping particles; meanwhile, the test device can better realize the visualization of the model.
Description of the drawings:
FIG. 1 is a schematic diagram of a simulation test device for researching piping phenomenon of underground construction engineering according to an embodiment of the present invention;
in this embodiment: the device comprises a control box 1, a motor 2, a water head lifting device 3, a water tank 4, a water inlet pipe 5, a water inlet valve 6, an organic glass cover plate 7, a water permeable plate 8, a piping port 9, a flow rate meter 10, an Olympic Bass microscope 11, a CCD camera 12, a test box 13, a water inlet chamber 131, a soil sample accommodating chamber 132, a water outlet pipe 14, a water permeable hole 15, a water outlet valve 16, a vertical pressurizing device 17, a base 18 and a multi-stage hydraulic cylinder 19.
The specific embodiment is as follows:
the following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Referring to fig. 1, the invention discloses a simulation test device for researching piping phenomenon of underground construction engineering, which comprises a test box body 13 made of organic glass plates, a vertical pressurizing device 17 for applying pressure to soil samples in the test box body 13, an intelligent water head control system based on a single chip microcomputer and a microscopic observation device. The left side of the upper stream of the test box body 13 is provided with a water inlet pipe 5 which is connected with the intelligent water head control system based on the singlechip through a water inlet valve 6, and the right side of the lower stream is provided with a water outlet pipe 14; the upper reaches department is equipped with the water inlet chamber 131 and soil sample holding chamber 132 in the test box 13 in the upper reaches interval formation, be equipped with a plurality of holes 15 that permeate water that regularly arrange on the test box 13 front side wall that soil sample holding chamber 132 corresponds, the diameter is 30mm for the hydroenergy that permeates up in the test process is discharged as early as possible and is not influenced the test, test box 13 top is sealed with organic glass apron 7, organic glass apron 7 surface is along the equidistant piping mouth 9 that has three diameters to 50mm to the low reaches and shutoff with the plug that opens, piping mouth 9 department is equipped with the sand-bearing disc, sand-bearing disc can collect the silt that gushes out, filters out water for judge granule particle diameter proportion piping mouth 9 with the critical velocity when the inlet tube 5 department installs flow velocity appearance 10 for real-time observation water velocity and piping take place.
The vertical pressurizing device 17 comprises a base 18 and a multi-stage hydraulic cylinder 19 fixed on the base 18, the test box 13 is arranged on the base 18, the multi-stage hydraulic cylinder 19 acts on the organic glass cover plate 7 to pressurize the soil sample step by step, each stage of pressurizing is controlled to be 0.1-0.2 kPa, and the change rule of piping critical speed under different pressures can be obtained by adjusting the flow rate of water.
The intelligent water head control system based on the single chip microcomputer comprises a water head lifting device 3, a motor 2 for controlling the water head lifting device 3 and a control box 1 for controlling the motor 2, wherein a water outlet of a water tank 4 in the water head lifting device 3 is connected with a water inlet pipe 5.
The microscopic observation device consists of an Olympic Bass microscope 11 with the amplification factor of 10-220 and a CCD camera 12, can be used for continuous automatic shooting or manual shooting, obtains pictures and images of local soil samples in the test process, is used for fine-view parameter analysis, and can be used for analyzing the change rule of critical grain sizes under different flow rates.
The implementation process of the test device of the invention is as follows:
firstly, fixing a water permeable plate, stacking soil samples in a soil sample accommodating chamber in a test box body, properly compacting and flattening the soil samples, reducing the natural state of soil as much as possible, and then covering an organic glass cover plate to ensure no gap between the soil samples and the organic glass cover plate, wherein a piping opening on the organic glass cover plate is plugged by a rubber plug, and a water inlet valve and a water outlet valve are in a closed state; zeroing the Olympus microscope, wherein the CCD camera and the flow velocity meter are in a working state; when tests with different seepage path lengths are carried out, piping ports at corresponding positions are opened, a vertical pressurizing device is started to pressurize soil samples, a water tank is filled with water, a power supply of a singlechip control box is connected, a water inlet valve is opened, and the flow rate of water is regulated, so that the water enters a water inlet chamber through a water inlet pipe; and then observing the change condition of the surface of the soil sample, observing the change condition of the fine appearance of particles on the surface of the soil sample through a microscope, when piping occurs to the soil sample, conveying water carrying fine sand to a piping port, observing the indication fed back by a flow rate meter, when the soil body is completely static, collecting sediment from a sand bearing disc, namely ending the test, and finally opening a water outlet valve. Through calculation, required data and related conclusions can be obtained. In each test process, the pressure applied to the soil sample by starting the vertical pressurizing device can be increased step by step, so that the change rule of piping critical speed under the condition that different pressures are applied to the soil sample can be researched.
In conclusion, the simulation test device for researching the piping phenomenon of the underground construction engineering can meet the simulation requirement of the piping phenomenon of the soil body. The critical speed of piping at different seepage path lengths can be obtained; the change rule of critical particle size under different flow rates and the particle size proportion of piping particles; a change rule of piping critical speed of the soil body under vertical pressure with different magnitudes; and (3) a change rule of a soil body mesostructure in the piping development process.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions, which are defined by the scope of the appended claims.
Claims (1)
1. The application method of the simulation test device for researching the piping phenomenon of the underground construction engineering is characterized by comprising the following steps: the device comprises a test box body, a vertical pressurizing device for applying pressure to a soil sample in the test box body, an intelligent water head control system based on a single chip microcomputer and a microscopic observation device, wherein a water inlet pipe is arranged on the left side of the upstream of the test box body and is connected with the intelligent water head control system based on the single chip microcomputer through a water inlet valve, and a water outlet pipe is arranged on the right side of the downstream of the test box body; the upper stream in the test box body is provided with a water inlet chamber and a soil sample accommodating chamber at intervals, the front side wall of the test box body corresponding to the soil sample accommodating chamber is provided with a plurality of water permeable holes which are regularly arranged, the top of the test box body is sealed by an organic glass cover plate, the surface of the organic glass cover plate is provided with a plurality of piping openings from the upper stream to the lower stream and is blocked by a rubber plug, and the piping openings and the water inlet pipe are provided with a flow rate meter;
the intelligent water head control system based on the single chip microcomputer comprises a water head lifting device, a motor for controlling the water head lifting device and a control box for controlling the motor, wherein a water outlet of a water tank in the water head lifting device is connected with the water inlet pipe;
the microscopic observation device consists of an Olympic Bass microscope with the amplification factor of 10-220 times and a CCD camera;
the vertical pressurizing device comprises a base and a multi-stage hydraulic cylinder fixed on the base, the test box body is arranged on the base, the multi-stage hydraulic cylinder acts on the organic glass cover plate to pressurize the soil sample step by step, and the pressurizing of each stage is controlled to be 0.1-0.2 kPa;
the outer side walls of the test box body are all organic glass plates;
the piping openings are distributed at equal intervals;
a sand bearing disc is arranged at the piping opening;
the method comprises the following steps: firstly, fixing a water permeable plate, stacking soil samples in a soil sample accommodating chamber in a test box, and then covering an organic glass cover plate to ensure no gap between the soil samples and the organic glass cover plate, wherein a piping opening on the organic glass cover plate is plugged by a rubber plug, and a water inlet valve and a water outlet valve are in a closed state; zeroing the Olympus microscope, wherein the CCD camera and the flow velocity meter are in a working state; when tests with different seepage path lengths are carried out, piping ports at corresponding positions are opened, a vertical pressurizing device is started to pressurize soil samples, a water tank is filled with water, a power supply of a singlechip control box is connected, a water inlet valve is opened, and the flow rate of water is regulated, so that the water enters a water inlet chamber through a water inlet pipe; then observing the change condition of the surface of the soil sample, observing the microscopic change condition of particles on the surface of the soil sample, when piping occurs to the soil sample, conveying water carrying fine sand to a piping port, observing the indication fed back by a flow rate meter, when the soil body is completely static, collecting sediment from a sand bearing disc, namely ending the test, and finally opening a water outlet valve; obtaining required data and conclusions through calculation; in each test process, the vertical pressurizing device is started to gradually increase the pressure applied to the soil sample, so that the change rule of the piping critical speed under the condition that the soil sample is applied with different pressures is researched.
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| CN201710095055.9A CN106644841B (en) | 2017-02-22 | 2017-02-22 | Analogue test device of research underground construction engineering piping phenomenon |
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| CN106644841B true CN106644841B (en) | 2023-10-03 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562526A (en) * | 2018-03-21 | 2018-09-21 | 中冶华天工程技术有限公司 | The experimental rig and test method of study two-dimensional and three dimensional fluid flow-soil particle Erosion Law |
| CN109884110A (en) * | 2019-03-22 | 2019-06-14 | 辽宁工程技术大学 | A kind of laboratory testing rig and method for simulating subgrade engineering freeze-thaw damage phenomenon |
| CN111308048B (en) * | 2020-02-28 | 2021-10-01 | 中国海洋大学 | Piping three-dimensional observation device and method based on PIV technology |
| CN112268848A (en) * | 2020-11-19 | 2021-01-26 | 中国水利水电第十二工程局有限公司 | Coarse-grained soil vertical osmotic deformation tester and experimental method |
| CN112834406B (en) * | 2021-01-08 | 2022-08-09 | 南京福欧地下空间数据科技有限公司 | Foundation pit piping image acquisition device and use method |
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