CN113155379A - Foundation pit support structure electric leakage detection simulation test device and test method thereof - Google Patents
Foundation pit support structure electric leakage detection simulation test device and test method thereof Download PDFInfo
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- CN113155379A CN113155379A CN202110386844.4A CN202110386844A CN113155379A CN 113155379 A CN113155379 A CN 113155379A CN 202110386844 A CN202110386844 A CN 202110386844A CN 113155379 A CN113155379 A CN 113155379A
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- 238000012360 testing method Methods 0.000 title claims abstract description 46
- 238000001514 detection method Methods 0.000 title claims abstract description 18
- 238000004088 simulation Methods 0.000 title claims abstract description 14
- 238000010998 test method Methods 0.000 title claims abstract description 8
- 239000002689 soil Substances 0.000 claims abstract description 146
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- 238000005192 partition Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000012528 membrane Substances 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 27
- 239000011521 glass Substances 0.000 claims description 12
- 229920003023 plastic Polymers 0.000 claims description 10
- 239000004033 plastic Substances 0.000 claims description 10
- 230000005684 electric field Effects 0.000 claims description 8
- 238000010291 electrical method Methods 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 238000011049 filling Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000011068 loading method Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 3
- 229940099259 vaseline Drugs 0.000 claims description 3
- 229920000114 Corrugated plastic Polymers 0.000 claims description 2
- SBYXRAKIOMOBFF-UHFFFAOYSA-N copper tungsten Chemical compound [Cu].[W] SBYXRAKIOMOBFF-UHFFFAOYSA-N 0.000 claims description 2
- 239000000839 emulsion Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 4
- 238000011161 development Methods 0.000 description 5
- 238000009412 basement excavation Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000004816 latex Substances 0.000 description 1
- 229920000126 latex Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/40—Investigating fluid-tightness of structures by using electric means, e.g. by observing electric discharges
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Abstract
The invention provides a foundation pit support structure electric method leakage detection simulation test device and a test method thereof, and belongs to the technical field of foundation pit construction tests. The inside of the model box is divided into an in-pit soil box and an out-pit soil box by a middle partition plate, the middle partition plate is vertically provided with a horizontal leakage groove and an air bag groove at intervals in sequence, reverse filtration membranes are pasted on two sides of the leakage groove, an air bag is arranged in the air bag groove, and the air bag is connected with a back side air hole. And the soil box inside the pit and the soil box outside the pit are filled with sample soil bodies, and the sample soil bodies are respectively inserted with a positive electrode and a negative electrode of a power supply. And measuring electrodes are sequentially arranged on the back side of the soil box in the pit at intervals, and the measuring electrodes and the positive and negative electrodes of the power supply are respectively connected with a data acquisition analyzer. And water collecting tanks are respectively arranged below the soil tank in the pit and the soil tank outside the pit, drain valves are respectively arranged outside the water collecting tanks, and the drain valves are arranged outside the soil tank outside the pit and communicated with the water collecting tank at the lower part of the soil tank outside the pit. And universal wheels and positioning piles are arranged at the lower part of the model box.
Description
Technical Field
The invention relates to the technical field of foundation pit construction tests, in particular to a model box device for an electric leakage detection simulation test of a foundation pit enclosure structure and a test method thereof.
Background
The major projects of urban railway track traffic, river-crossing tunnels, underground space development and utilization and the like often involve excavation and supporting of deep foundation pits. In the construction process of the deep foundation pit in the water-rich stratum, due to the influence of various objective and subjective factors, the enclosure structure often leaks at local individual positions, so that engineering accidents such as soil flowing, piping, inrush, enclosure structure damage and the like are caused, the construction period is delayed, and the safety of buildings and underground pipelines in and around the foundation pit is possibly damaged. Therefore, before excavation of a foundation pit, trenchless leakage detection needs to be carried out on a wall buried in a stratum, and the position with defects needs to be blocked in advance.
An electrical method based on a flow field fitting principle is a novel foundation pit support structure leakage nondestructive detection method, and utilizes the low conductivity of a support structure wall body and the high conductivity of a leakage position, and power is supplied in a drill hole on the outer side of a foundation pit, the voltage distribution on the inner side of the foundation pit is measured, and the leakage position is identified. However, the current electric method detection is still less in application, has applicability in the environment and does not form a uniform and mature technical standard. Therefore, a set of model box devices for an electrical method leak detection simulation test with reliable theory, convenient operation and environmental friendliness is needed to be invented for research.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a model box device for an electric leakage detection simulation test of a foundation pit support structure and a test method thereof, and solves the problems in the background technology.
In order to achieve the purpose, the technical solution of the invention is as follows:
the utility model provides a foundation ditch enclosure structure electricity method leak hunting analogue test's mold box device which characterized in that: including soil box (1) in the hole, soil box (2) outside the hole, median septum (3), plastics drain bar (4), feed water tank (5), header tank (6) in the hole, header tank (7) outside the hole, positive power (8), power negative pole (9), measuring electrode (10), data acquisition analysis appearance, wherein: the middle partition plate (3) is vertically provided with horizontal leakage grooves (12) and air bag grooves (13) at intervals in sequence; the middle partition plate (3): reverse filtration membranes (14) are attached to two sides of the leakage groove (12), an air bag is arranged in the air bag groove (13), and the air bag is connected with an air hole (15) on the back side of the model box; filling sample soil bodies in the soil box (1) in the pit and the soil box (2) outside the pit to simulate and form a water-bearing stratum; a power supply positive electrode (8) and a power supply negative electrode (9) are respectively inserted into the sample soil body to form an electric field in the sample soil body; measuring electrodes (10) are sequentially inserted at intervals at the back side of the soil box (1) in the pit; the power supply anode (8), the power supply cathode (9) and the measuring electrode (10) are respectively connected with a data acquisition analyzer so as to record the dynamic change of electric field potential information in a sample soil body in real time; an inner pit water collecting tank (6) and an outer pit water collecting tank (7) are respectively arranged at the lower parts of the inner pit soil tank (1) and the outer pit soil tank (2); the outer sides of the pit inner water collecting tank (6) and the pit outer water collecting tank (7) are respectively provided with a pit inner water collecting tank drain valve (16) and a pit outer water collecting tank drain valve (17), and flow meters are arranged at the mouths of the pit inner water collecting tank drain valve (16) and the pit outer water collecting tank drain valve (17); the pit external soil box drainage valve is characterized in that an aluminum frame (19) is arranged on the back side of the pit external soil box (2), a water supply tank (5) and a water supply valve (20) are arranged on the aluminum frame (19), a pit external soil box drainage valve (21) is arranged on the outer side of the pit external soil box (2), the pit external soil box drainage valve (21) is communicated with a pit external water collection tank (7), and the pit external soil box drainage valve (21) and the water supply valve (20) jointly control the water head height of the pit external soil box (2).
The test method of the model box device of the foundation pit enclosure structure electrical method leak detection simulation test is characterized by comprising the following steps of:
After the preparation of the sample soil body and the sample liquid is finished and before the sample is loaded, the correct splicing connection of each part of the test system is confirmed, the leakage condition is not generated, the air in the flowmeter is completely discharged, all drain valves and water supply valves are closed, and sufficient sample liquid is loaded in the water supply tank (5); vaseline with a certain thickness is uniformly coated on the inner walls of the soil box (1) in the pit and the soil box (2) outside the pit so as to prevent sample liquid from flowing to the side wall of the box body and concentrating in the test process; sufficient gas is injected into the air bag in the air bag groove (13) through the air hole (15), so that the air bag is ensured to completely block the leakage groove (12) and the leakage cannot occur.
Filling prepared samples into a pit inner soil box (1) and a pit outer soil box (2) in a layered manner, and compacting to a preset compactness; after the sample is loaded, opening a water supply valve (20) to inject sample liquid into the soil box (2) outside the pit, gradually raising the water level in the sample from bottom to top, closing the water supply valve (20) after the water level completely submerges the sample, and standing for 12 hours to perform water soaking saturation; after 12 hours, opening one of the drainage valves (21) of the soil box outside the preset pit, opening the water supply valve (20) again and adjusting the injection flow rate of the sample liquid until the water head is stabilized at the preset height;
Inserting a power supply positive electrode (8) and a power supply negative electrode (9) into sample soil bodies of the soil box (1) in the pit and the soil box (2) outside the pit respectively, and starting to supply power; starting a data acquisition analyzer to start recording potential changes on the power supply anode (8), the power supply cathode (9) and the measuring electrode (10); opening the high-speed camera on the front side of the front face of the model box to start recording the states of the sample soil and the sample liquid;
one of the preset air bags is drawn out through the air hole (15) to cause the leakage of the leakage groove (12) where the air bag is positioned, and the water supply valve (20) is adjusted to cause the water head in the soil box (2) outside the pit to be stable and unchanged;
When the potential displayed on the data acquisition analyzer does not change any more, exporting the data to a notebook computer, and ending the test; turning off the camera, turning off the data acquisition analyzer, turning off the power supply, and turning off the water supply valve (2) and the drain valve (21) of the soil box outside the pit; opening a drain valve (16) of a sump inside the pit and a drain valve (17) of a sump outside the pit, recording the liquid amounts in a sump inside (6) and a sump outside (7) through a flowmeter, and closing all the drain valves after the liquid in the sump is completely discharged; and (3) disassembling the organic glass plate on the front sides of the soil box (1) in the pit and the soil box (2) outside the pit, and removing the soil body of the sample in the box.
Compared with the prior art, the invention has the following remarkable advantages:
1. the testing device is formed by splicing organic glass plates, can isolate the current in the box body, and ensures the safety of testing personnel;
2. the test device is formed by splicing organic glass plates, and can be used for conveniently observing and recording the actual deformation trend of a sample soil body in the box and the actual seepage development of sample liquid;
3. the test device is formed by splicing organic glass plates, and any organic glass plate can be detached after the test is finished, so that a sample soil body in the box can be conveniently and quickly removed;
5. the experimental device can control the water head height in the soil box (2) outside the pit at a preset position by adjusting the drain valve (21) of the soil box outside the pit and the water supply valve (20);
6. the universal wheels (22) and the positioning piles (23) are arranged at the bottom of the testing device, so that the testing device can be conveniently and quickly moved to any proper position, and then the positioning piles are pulled down to fix the positions.
7. The experimental device adopts the middle partition plate made of the organic glass plate to simulate the building envelope, and the air holes are used for inflating and deflating the air bag made of the latex film with extremely strong elasticity in the air bag groove (13) in the leakage groove (12) so as to simulate various leakage working conditions of the building envelope, such as different preset embedded depths, different degrees and the like.
Drawings
FIG. 1: an elevation view of a model box device for a foundation pit support structure electrical method leak detection simulation test;
FIG. 2: a top view of a model box device for a foundation pit support structure electrical method leak detection simulation test;
FIG. 3: a front elevation view of the middle separator 3.
Description of the labeling: 1-pit soil box; 2-pit external soil box; 3-a middle partition plate;
5-water supply tank; 20-water supply valve;
6-water collecting tank in the pit; 7-water collecting tank outside the pit; 16-drainage valve of water collecting tank in pit; 17-drainage valve of water collecting tank outside pit; 21-drain valve of soil box outside pit; 4-plastic drain board;
8-positive pole of power supply; 9-negative pole of power supply; 10-a measuring electrode;
3-middle partition board: 12-a leakage groove; 13-an airbag slot; 14-a reverse filtration membrane;
11-bottom support; 22-universal wheels; 23-positioning the pile;
15-pores;
18-a card slot; 19-an aluminum frame;
detailed description of the invention
The present invention will be described in further detail with reference to the accompanying drawings.
The utility model provides a foundation ditch enclosure structure electricity method leak hunting analogue test's mold box device which characterized in that: including soil box (1) in the hole, soil box (2) outside the hole, median septum (3), plastics drain bar (4), feed water tank (5), header tank (6) in the hole, header tank (7) outside the hole, positive power (8), power negative pole (9), measuring electrode (10), data acquisition analysis appearance, wherein:
the middle partition plate (3) is vertically provided with horizontal leakage grooves (12) and air bag grooves (13) at intervals in sequence;
the middle partition plate (3): reverse filtration membranes (14) are attached to two sides of the leakage groove (12), an air bag is arranged in the air bag groove (13), and the air bag is connected with an air hole (15) on the back side of the model box;
filling sample soil bodies in the soil box (1) in the pit and the soil box (2) outside the pit to simulate and form a water-bearing stratum; a power supply positive electrode (8) and a power supply negative electrode (9) are respectively inserted into the sample soil body to form an electric field in the sample soil body;
measuring electrodes (10) are sequentially inserted at intervals at the back side of the soil box (1) in the pit;
the power supply anode (8), the power supply cathode (9) and the measuring electrode (10) are respectively connected with a data acquisition analyzer so as to record the dynamic change of electric field potential information in a sample soil body in real time;
an inner pit water collecting tank (6) and an outer pit water collecting tank (7) are respectively arranged at the lower parts of the inner pit soil tank (1) and the outer pit soil tank (2); the outer sides of the pit inner water collecting tank (6) and the pit outer water collecting tank (7) are respectively provided with a pit inner water collecting tank drain valve (16) and a pit outer water collecting tank drain valve (17), and flow meters are arranged at the mouths of the pit inner water collecting tank drain valve (16) and the pit outer water collecting tank drain valve (17);
the pit external soil box drainage valve is characterized in that an aluminum frame (19) is arranged on the back side of the pit external soil box (2), a water supply tank (5) and a water supply valve (20) are arranged on the aluminum frame (19), a pit external soil box drainage valve (21) is arranged on the outer side of the pit external soil box (2), the pit external soil box drainage valve (21) is communicated with a pit external water collection tank (7), and the pit external soil box drainage valve (21) and the water supply valve (20) jointly control the water head height of the pit external soil box (2).
Soil box (1) in the hole, soil box (2) outside the hole, header tank (6) in the hole, header tank (7) outside the hole are assembled by transparent organic glass board and are connected by bolt all around to it is waterproof to be equipped with the sealing strip, and the organic glass board of can dismantling after experimental going on finishing clears away the soil body fast.
Smooth plastic coiled materials are attached to the soil facing surface of the soil box (1) in the pit, the soil box (2) outside the pit and the middle partition plate (3) so as to reduce friction between the side wall and a sample soil body.
The power supply anode (8), the power supply cathode (9) and the measuring electrode (10) are all made of tungsten copper rods;
and one end of the measuring electrode (10) inserted into the model box is provided with threads, and is provided with a waterproof sealing gasket and a nut so as to prevent the soil and water loss of the soil box (1) in the pit.
The plastic drainage plate (4) is made of a corrugated plastic plate wrapped by a reverse filter membrane.
The air bags in the air bag grooves (13) are made of emulsion films, the elasticity is strong, and the leakage grooves (12) can be opened and closed to simulate leakage of the building envelope at different positions and different degrees.
The test method of the model box device of the foundation pit enclosure structure electrical method leak detection simulation test is characterized by comprising the following steps of:
After the preparation of the sample soil body and the sample liquid is finished and before the sample is loaded, the correct splicing connection of each part of the test system is confirmed, the leakage condition is not generated, the air in the flowmeter is completely discharged, all drain valves and water supply valves are closed, and sufficient sample liquid is loaded in the water supply tank (5); vaseline with a certain thickness is uniformly coated on the inner walls of the soil box (1) in the pit and the soil box (2) outside the pit so as to prevent sample liquid from flowing to the side wall of the box body and concentrating in the test process; sufficient gas is injected into the air bag in the air bag groove (13) through the air hole (15), so that the air bag is ensured to completely block the leakage groove (12) and the leakage cannot occur.
Filling prepared samples into a pit inner soil box (1) and a pit outer soil box (2) in a layered manner, and compacting to a preset compactness; after the sample is loaded, opening a water supply valve (20) to inject sample liquid into the soil box (2) outside the pit, gradually raising the water level in the sample from bottom to top, closing the water supply valve (20) after the water level completely submerges the sample, and standing for 12 hours to perform water soaking saturation; after 12 hours, opening one of the drainage valves (21) of the soil box outside the preset pit, opening the water supply valve (20) again and adjusting the injection flow rate of the sample liquid until the water head is stabilized at the preset height;
Inserting a power supply positive electrode (8) and a power supply negative electrode (9) into sample soil bodies of the soil box (1) in the pit and the soil box (2) outside the pit respectively, and starting to supply power; starting a data acquisition analyzer to start recording potential changes on the power supply anode (8), the power supply cathode (9) and the measuring electrode (10); opening the high-speed camera on the front side of the front face of the model box to start recording the states of the sample soil and the sample liquid;
one of the preset air bags is drawn out through the air hole (15) to cause the leakage of the leakage groove (12) where the air bag is positioned, and the water supply valve (20) is adjusted to cause the water head in the soil box (2) outside the pit to be stable and unchanged;
When the potential displayed on the data acquisition analyzer does not change any more, exporting the data to a notebook computer, and ending the test; turning off the camera, turning off the data acquisition analyzer, turning off the power supply, and turning off the water supply valve (2) and the drain valve (21) of the soil box outside the pit; opening a drain valve (16) of a sump inside the pit and a drain valve (17) of a sump outside the pit, recording the liquid amounts in a sump inside (6) and a sump outside (7) through a flowmeter, and closing all the drain valves after the liquid in the sump is completely discharged; and (3) disassembling the organic glass plate on the front sides of the soil box (1) in the pit and the soil box (2) outside the pit, and removing the soil body of the sample in the box.
And processing digital pictures at each stage recorded by the camera by using ImageJ software, analyzing the seepage development trend, and comparing the seepage development trend with the potential variation trend of each point recorded by the data acquisition analyzer. And analyzing the deformation trend of the soil body by adopting a PIV technology.
The invention can well simulate the electric method-based leakage detection of the foundation pit support structure under various working conditions of different soil properties, different water qualities, different ground wall leakage and the like, and analyze the applicability and the characteristics of the foundation pit support structure under different working conditions.
The test device can simultaneously measure the electric field change in the sample soil body by using the measuring electrode, record the actual seepage development rule of the sample liquid in the sample soil body by using the high-speed camera, measure the seepage speed of the sample liquid in the sample soil body by using the flowmeter, verify the similar principle of the electric field and the flow field by comparison analysis, and calibrate the conversion relation.
Furthermore, vertical clamping grooves (18) are formed in the front side and the rear side of the interior of the soil box (1) in the pit, plastic drainage plates (4) capable of sliding up and down are arranged on the clamping grooves (18), and the plastic drainage plates (4) are communicated with the water collecting tank (6) in the pit so as to strengthen the seepage effect in the soil body of the sample.
The invention also comprises a bottom support (11):
the bottom support (11) comprises universal wheels (22) and positioning piles (23), the universal wheels (22) can rotate 360 degrees, the model box device can be quickly pushed to a test area, after the model box device reaches the test area, the positioning piles (23) on one side of the universal wheels (22) are pulled down, and the model box device is fixed at the position and does not move any more.
Claims (7)
1. The utility model provides a foundation ditch enclosure structure electricity method leak hunting analogue test's mold box device which characterized in that: including soil box (1) in the hole, soil box (2) outside the hole, median septum (3), plastics drain bar (4), feed water tank (5), header tank (6) in the hole, header tank (7) outside the hole, positive power (8), power negative pole (9), measuring electrode (10), data acquisition analysis appearance, wherein:
the middle partition plate (3) is vertically provided with horizontal leakage grooves (12) and air bag grooves (13) at intervals in sequence;
the middle partition plate (3): reverse filtration membranes (14) are attached to two sides of the leakage groove (12), an air bag is arranged in the air bag groove (13), and the air bag is connected with an air hole (15) on the back side of the model box;
filling sample soil bodies in the soil box (1) in the pit and the soil box (2) outside the pit to simulate and form a water-bearing stratum; a power supply positive electrode (8) and a power supply negative electrode (9) are respectively inserted into the sample soil body to form an electric field in the sample soil body;
measuring electrodes (10) are sequentially inserted at intervals at the back side of the soil box (1) in the pit;
the power supply anode (8), the power supply cathode (9) and the measuring electrode (10) are respectively connected with a data acquisition analyzer so as to record the dynamic change of electric field potential information in a sample soil body in real time;
an inner pit water collecting tank (6) and an outer pit water collecting tank (7) are respectively arranged at the lower parts of the inner pit soil tank (1) and the outer pit soil tank (2); the outer sides of the pit inner water collecting tank (6) and the pit outer water collecting tank (7) are respectively provided with a pit inner water collecting tank drain valve (16) and a pit outer water collecting tank drain valve (17), and flow meters are arranged at the mouths of the pit inner water collecting tank drain valve (16) and the pit outer water collecting tank drain valve (17);
the pit external soil box drainage valve is characterized in that an aluminum frame (19) is arranged on the back side of the pit external soil box (2), a water supply tank (5) and a water supply valve (20) are arranged on the aluminum frame (19), a pit external soil box drainage valve (21) is arranged on the outer side of the pit external soil box (2), the pit external soil box drainage valve (21) is communicated with a pit external water collection tank (7), and the pit external soil box drainage valve (21) and the water supply valve (20) jointly control the water head height of the pit external soil box (2).
2. The model box device of the foundation pit enclosure electrical method leak hunting analogue test of claim, characterized in that: soil box (1) in the hole, soil box (2) outside the hole, header tank (6) in the hole, header tank (7) outside the hole are assembled by transparent organic glass board and are connected by bolt all around to it is waterproof to be equipped with the sealing strip, and the organic glass board of can dismantling after experimental going on finishing clears away the soil body fast.
3. The model box device of the foundation pit enclosure electrical method leak hunting analogue test of claim, characterized in that: smooth plastic coiled materials are attached to the soil facing surface of the soil box (1) in the pit, the soil box (2) outside the pit and the middle partition plate (3) so as to reduce friction between the side wall and a sample soil body.
4. The mold box device for the electrical leakage detection simulation test of the foundation pit enclosure structure according to claim 1, wherein: the power supply anode (8), the power supply cathode (9) and the measuring electrode (10) are all made of tungsten copper rods;
and one end of the measuring electrode (10) inserted into the model box is provided with threads, and is provided with a waterproof sealing gasket and a nut so as to prevent the soil and water loss of the soil box (1) in the pit.
5. The mold box device for the electrical leakage detection simulation test of the foundation pit enclosure structure according to claim 1, wherein: the plastic drainage plate (4) is made of a corrugated plastic plate wrapped by a reverse filter membrane.
6. The mold box device for the electrical leakage detection simulation test of the foundation pit enclosure structure according to claim 1, wherein: the air bags in the air bag grooves (13) are made of emulsion films, the elasticity is strong, and the leakage grooves (12) can be opened and closed to simulate leakage of the building envelope at different positions and different degrees.
7. A test method of a model box device for an electric leakage detection simulation test of a foundation pit enclosure structure based on any one of claims 1-6 is characterized by comprising the following steps:
step 1, early preparation
After the preparation of the sample soil body and the sample liquid is finished and before the sample is loaded, the correct splicing connection of each part of the test system is confirmed, the leakage condition is not generated, the air in the flowmeter is completely discharged, all drain valves and water supply valves are closed, and sufficient sample liquid is loaded in the water supply tank (5); vaseline with a certain thickness is uniformly coated on the inner walls of the soil box (1) in the pit and the soil box (2) outside the pit so as to prevent sample liquid from flowing to the side wall of the box body and concentrating in the test process; sufficient gas is injected into the air bag in the air bag groove (13) through the air hole (15), so that the air bag is ensured to completely block the leakage groove (12) and the leakage cannot occur.
Step 2, sample loading and saturation
Filling prepared samples into a pit inner soil box (1) and a pit outer soil box (2) in a layered manner, and compacting to a preset compactness; after the sample is loaded, opening a water supply valve (20) to inject sample liquid into the soil box (2) outside the pit, gradually raising the water level in the sample from bottom to top, closing the water supply valve (20) after the water level completely submerges the sample, and standing for 12 hours to perform water soaking saturation; after 12 hours, opening one of the drainage valves (21) of the soil box outside the preset pit, opening the water supply valve (20) again and adjusting the injection flow rate of the sample liquid until the water head is stabilized at the preset height;
step 3, test operation and data acquisition
Inserting a power supply positive electrode (8) and a power supply negative electrode (9) into sample soil bodies of the soil box (1) in the pit and the soil box (2) outside the pit respectively, and starting to supply power; starting a data acquisition analyzer to start recording potential changes on the power supply anode (8), the power supply cathode (9) and the measuring electrode (10); opening the high-speed camera on the front side of the front face of the model box to start recording the states of the sample soil and the sample liquid;
one of the preset air bags is drawn out through the air hole (15) to cause the leakage of the leakage groove (12) where the air bag is positioned, and the water supply valve (20) is adjusted to cause the water head in the soil box (2) outside the pit to be stable and unchanged;
step 4, end the test
When the potential displayed on the data acquisition analyzer does not change any more, exporting the data to a notebook computer, and ending the test; turning off the camera, turning off the data acquisition analyzer, turning off the power supply, and turning off the water supply valve (2) and the drain valve (21) of the soil box outside the pit; opening a drain valve (16) of a sump inside the pit and a drain valve (17) of a sump outside the pit, recording the liquid amounts in a sump inside (6) and a sump outside (7) through a flowmeter, and closing all the drain valves after the liquid in the sump is completely discharged; and (3) disassembling the organic glass plate on the front sides of the soil box (1) in the pit and the soil box (2) outside the pit, and removing the soil body of the sample in the box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110386844.4A CN113155379A (en) | 2021-04-12 | 2021-04-12 | Foundation pit support structure electric leakage detection simulation test device and test method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110386844.4A CN113155379A (en) | 2021-04-12 | 2021-04-12 | Foundation pit support structure electric leakage detection simulation test device and test method thereof |
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| Publication Number | Publication Date |
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| CN113155379A true CN113155379A (en) | 2021-07-23 |
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