CN110552383B - Model test device for supporting structure of foundation pit in sea - Google Patents
Model test device for supporting structure of foundation pit in sea Download PDFInfo
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- CN110552383B CN110552383B CN201910904782.4A CN201910904782A CN110552383B CN 110552383 B CN110552383 B CN 110552383B CN 201910904782 A CN201910904782 A CN 201910904782A CN 110552383 B CN110552383 B CN 110552383B
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- 238000012360 testing method Methods 0.000 title claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 156
- 239000002689 soil Substances 0.000 claims abstract description 50
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 238000012806 monitoring device Methods 0.000 claims abstract description 15
- 239000007788 liquid Substances 0.000 claims description 54
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 40
- 229910052782 aluminium Inorganic materials 0.000 claims description 40
- 239000011521 glass Substances 0.000 claims description 39
- 239000011148 porous material Substances 0.000 claims description 25
- 239000000203 mixture Substances 0.000 claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000000741 silica gel Substances 0.000 claims description 3
- 229910002027 silica gel Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a model test device for a supporting structure of a sea-free foundation pit, which comprises a moving water injection device, a model box, a water-soil separation device and a monitoring device; the moving water injection device injects water like a model box, and the water is regularly changed in a sine or cosine curve along with time so as to simulate the change of sea waves and tides; the model box is used for simulating foundation pit supporting structures at different distances close to sea, and soil samples are filled in the model box; the water-soil separation device is used for simulating the conditions of soil seepage and water seepage under the foundation pit supporting structure, and measuring the soil yield and the water yield; the monitoring device records the water pressure of water flowing through a certain position in the model box in real time; the monitoring device records the pressure born by the foundation pit supporting structure at different positions and the strain in the horizontal and vertical directions in real time.
Description
Technical Field
The experiment relates to an experimental device of a sea-going foundation pit supporting structure model, which is used for measuring the change of the water pressure in soil caused by the water pressure change during tide fluctuation and the influence on the sea-going foundation pit supporting structure.
Background
With the high-speed development of economy, coastal construction projects such as hot land are constructed, and along with this, a large number of coastal foundation pits are developed and constructed. According to the prior construction, the fluctuation of tide has great influence on the construction of the foundation pit, and the instability and the damage of the foundation pit supporting structure are related to the foundation pit supporting structure. Through further research, under the action of tidal water circulation fluctuation, pore water pressure in soil around the foundation pit adjacent to the sea is continuously changed, so that pressure is generated on a foundation pit supporting structure, deformation is caused, and the safe use of the foundation pit adjacent to the sea is affected. In order to study the stress and deformation of the foundation pit supporting structure caused by tide fluctuation, the experimental device is particularly important.
At present, the research on the foundation pit is mostly only aimed at the conventional foundation pit, such as the penetration condition of surface water to the foundation pit retaining wall, the displacement of the foundation pit supporting structure, the soil deformation and the like. Since the fluctuation of tide water is negligible to the deformation of the conventional foundation pit, the previous research on the conventional foundation pit does not relate to the influence of the tide water, and the construction design of the conventional foundation pit is not very reference for the sea foundation pit. In addition, the engineering which can be referred to is seawall engineering, the seawall is used as a wave-resistant building, and the fluctuation of tide water must be considered in the construction design. For such engineering, the former has made a lot of researches, however, for general foundation pit support, the support structure is only a temporary measure, while the seawall engineering is a permanent engineering, if the standard of the seawall engineering is used for construction, the phenomenon of resource waste can be caused, and the construction requirement cannot be met.
Disclosure of Invention
The invention mainly aims to explore the influence of tidal fluctuation variation on a supporting structure, and provides a model test device for a foundation pit supporting structure which can be used for approaching the sea.
In order to solve the technical problems, the invention provides a model test device for a supporting structure of a temporary foundation pit, which comprises a movable water injection device, a model box, a water-soil separation device and a monitoring device;
the dynamic water injection device injects water into the model box, and the water is regularly changed in a sine or cosine curve along with time so as to simulate the change of sea waves and tides;
the model box is used for simulating foundation pit supporting structures at different distances close to sea, and soil samples are filled in the model box;
the water-soil separation device is used for simulating the conditions of soil seepage and water seepage under the foundation pit supporting structure, and measuring the soil yield and the water yield;
the monitoring device records the water pressure of water flowing through a certain position in the model box in real time; the monitoring device records the pressure born by the foundation pit supporting structure at different positions and the strain in the horizontal and vertical directions in real time.
In a preferred embodiment: the dynamic water injection device comprises an air compressor, a regulating valve, a gas-liquid pump, a plunger system, a water tank and a fluctuation acquisition sensor;
the air compressor is connected with the regulating valve through a flange, the regulating valve is connected with the air-liquid booster pump through a pressure-resistant pipe, the air-liquid booster pump is connected with the plunger system through a pressure-resistant pipe, and the air-liquid booster pump is connected with the water tank through a guide pipe;
when the gas-liquid booster pump works, the piston moves backwards, water in the water tank is sucked into the gas-liquid pump, the one-way valve at the inlet of the gas-liquid pump is opened, and air enters the gas-liquid pump through the pressure-resistant pipe; when the piston moves forwards, a certain pressure is formed on one side of the liquid, the one-way valve at the outlet of the gas-liquid pump is opened, high-pressure water flows out from the outlet, then the high-pressure water is injected into the plunger system through the pressure-resistant pipe, the plunger system utilizes the action of the piston to regularly change the pressure of the high-pressure water along with the time in a sine curve or a cosine curve, so that dynamic fluctuation water pressure is obtained, and then the water is injected into the model box through the pressure-resistant pipe.
In a preferred embodiment: the model box comprises a model groove, a water permeable plate and a supporting structure;
the mold groove comprises an aluminum top cover, an aluminum bottom plate, an aluminum side wall and an organic glass side wall; the aluminum side wall is arranged at the rear, the organic glass side wall is arranged at the front, the tops of the aluminum side wall and the organic glass side wall are respectively connected and fixed with the aluminum top cover through flanges, and the bottoms of the aluminum side wall and the organic glass side wall are connected and fixed with the aluminum bottom plate through flanges;
the symmetrical positions of the inner shafts of the aluminum top cover, the aluminum bottom plate and the aluminum side wall are respectively provided with a sliding rail, and the aluminum top cover and the aluminum bottom plate are provided with a plurality of bolt holes along the sliding rails; the support structure is fixed at the tail end of the model groove through bolts and is used for simulating Larson steel sheet piles in foundation pit engineering; the web plate of the supporting structure is provided with 6 bilaterally symmetrical bolt holes for simulating leakage holes generated by the damage of the supporting structure; the water permeable plate is connected with the movable water injection device through the pressure-resistant pipe and is arranged in the model groove, three grooves are respectively dug on the three sides of the attached top cover, the bottom plate and the aluminum side wall of the water permeable plate and are matched with the sliding rails of the model groove, so that the water permeable plate can move in the direction of the model groove, which is close to the supporting structure or far away from the supporting structure, and the position of the water permeable plate in the model groove is adjusted to simulate foundation pit supporting structures at different distances close to sea.
In a preferred embodiment: the water-soil separation device comprises a pressure-resistant pipe, a pipeline, a mixture separation device, a liquid storage tank, two electronic scales and a filter screen;
one end of the pressure-resistant pipe is connected with one bolt hole on the supporting structure, one end of the pressure-resistant pipe is connected with the mixture separating device, one end of the pipeline is guided to the liquid storage tank, and the mixture separating device and the liquid storage tank are respectively arranged on the two electronic scales and read data in real time;
the mixture separating device consists of an upper organic glass cylinder and a lower organic glass cylinder, and a silica gel plate is placed between the upper organic glass cylinder and the lower organic glass cylinder for sealing; the upper organic glass cylinder and the lower organic glass cylinder are provided with flanges and are fixed through bolts, a filter screen is arranged between the upper organic glass cylinder and the lower organic glass cylinder, solid particles at the lower part are prevented from passing through, and solid-liquid separation is realized;
the liquid flows into the liquid storage tank through the pipeline, and the liquid storage tank is composed of four pieces of organic glass and is a cube organic glass groove with an opening at the upper part.
In a preferred embodiment: the monitoring device comprises a miniature pore water pressure gauge, a resistance strain gauge, a data acquisition device and a computer terminal;
the miniature pore water pressure gauge is arranged on the organic glass side plate of the model groove, is connected to the computer terminal through the data acquisition and transmission module, and can monitor the pressure of the recorded water flowing through a specific distance in real time;
the supporting structure is uniformly provided with a plurality of micro pore water pressure gauges and a plurality of resistance strain gauges in the horizontal and vertical directions, and the micro pore water pressure gauges and the resistance strain gauges are connected to a computer terminal through a data acquisition device, so that the pressure born by the supporting structure at different positions and the strain in the horizontal and vertical directions can be monitored and recorded in real time.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. the invention provides a model test device for a supporting structure of a sea-going foundation pit, which adopts a dynamic water injection device to enable high-pressure air to be changed into high-pressure liquid under the action of a gas-liquid booster pump, and simultaneously enables fixed high-pressure water to be changed into fluctuating water pressure through a plunger system.
2. The invention provides a model test device for a foundation pit supporting structure in the sea, which is arranged in a model groove and is movable, and a plurality of groups of experiments are carried out by placing the water permeable plates at different positions, so that the water pressure and deformation of foundation pit supporting structures in different distances in the sea under the same tide change can be simulated.
3. The invention provides a model test device for a supporting structure of a sea-free foundation pit, which is provided with a plurality of miniature pore water pressure gauges arranged on an organic glass cover of a model box and can record the pressure changes of different distances in soil under the same tide change in real time.
4. The invention provides a model test device for a supporting structure of a sea-free foundation pit, which is used for carrying out opening on a supporting structure to simulate the damage of the supporting structure and the conditions of water seepage and soil seepage, realizing water-soil separation by adopting a water-soil separation device and measuring the soil output and the water yield by the indication of an electronic scale.
5. The invention provides a model test device for a supporting structure of a sea-free foundation pit, which is used for perforating the supporting structure, placing a miniature pore water pressure gauge and a strain gauge on the supporting structure, measuring the pressure and the strain on the supporting structure, and simulating the stress and the deformation after the supporting is damaged.
6. The invention provides a model test device for a supporting structure of a sea-going foundation pit, which is characterized in that a miniature pore water pressure gauge and a strain gauge are connected to a computer terminal through a data acquisition and transmission module, so that the pressure value in soil and the change thereof and the pressure and deformation of the supporting structure can be recorded in real time. The pressure change curve, the pressure distribution map and the strain distribution map of the supporting structure can be made through data acquisition.
Drawings
FIG. 1 is an overall device diagram;
FIG. 2 is a diagram of a power water injection device;
FIG. 3 is a cut-away view of a support structure;
FIG. 4 is a cross section of a web of a support structure;
FIG. 5 is a cross section of a model trough and a water permeable plate;
FIG. 6 is a water and soil separating device;
FIG. 7 is a layout of a miniature pore water pressure gauge on the back of a mold box apparatus;
in the figure: the device comprises a 1-air compressor 2-regulating valve 3-gas-liquid booster pump 4-plunger system 5-water tank 6-fluctuation acquisition sensor 7-model tank 8-supporting structure 9-water permeable plate 10-slide rail 11-web 12-flange 13-pipeline 14-mixture separating device 15-liquid storage tank 16-electronic scale 17-electronic scale 18-filter screen 19-micro pore water pressure gauge 20-resistance strain gauge 21-data acquisition device 22-computer terminal 23-flange 24-pressure-resistant pipe 25-conduit.
Detailed Description
The invention is further described below by means of specific embodiments
Referring to fig. 1, a model test device for a supporting structure of a sea-free foundation pit comprises a moving water injection device, a model box, a water-soil separation device and a monitoring device.
The dynamic water injection device comprises an air compressor 1, a regulating valve 2, a gas-liquid booster pump 3, a plunger system 4, a water tank 5 and a fluctuation acquisition sensor 6. The device can enable the water pressure applied to the soil sample to automatically change regularly along with the time in a sine or cosine curve so as to simulate the water pressure change caused by the cyclic fluctuation of tide water.
Referring to fig. 2, the air compressor 1 and the regulating valve 2 are connected by a flange 23, the regulating valve 2 and the gas-liquid booster pump 3 are connected by a pressure pipe 24, the gas-liquid booster pump 3 and the plunger system are connected by a pressure pipe 24, and the gas-liquid booster pump 3 and the water tank 5 are connected by a conduit 25.
The air compressor 1 adopts a centrifugal compressor, the air pressure is 0.1-5mpa, the power is 300-450kw, and the air compressor is used for applying work to the gas to increase the pressure and the speed of the gas, so that high-pressure air is obtained. The regulating valve 2 adopts an electronic single-seat electric regulating valve, the pressure is 0.1-5mpa, and the regulating valve is used for regulating the pressure value of air conveyed by the air compressor 1. The gas-liquid booster pump 3 adopts a single-drive-head single-action pump, the pressure ratio is 6:1, and the output pressure is 0-5mpa. The gas-liquid booster pump 3 is a reciprocating plunger pump using gas as a power source, and converts a low-pressure driving surface of a large-area piston end into high-pressure liquid of a small-area piston end. When the gas-liquid booster pump 3 works, the piston moves backwards, water in the water tank 5 is sucked into the pump, at the moment, the check valve at the inlet is opened, air enters the pump through the pressure-resistant pipe 24, when the piston moves forwards, a certain pressure is formed at one side of the liquid, the check valve at the outlet is opened, high-pressure water flows out from the outlet, then the high-pressure water is injected into the plunger system 4 through the pressure-resistant pipe 24, the plunger system 4 utilizes the piston effect to regularly change the pressure of the high-pressure water in a sine curve or a cosine curve along with time, so that dynamic fluctuation water pressure is obtained, and the water is injected into the model box through the pressure-resistant pipe 24. The piston system can set dynamic fluctuation pressure through the fluctuation acquisition sensor 6 and acquire the pressure in real time to generate a fluctuation curve, so that later data analysis is facilitated.
The model box comprises a model groove 7 (3 m long, 1m wide and 1m high), a supporting structure 8 and a water permeable plate 9.
The mold tank 7 comprises a 1cm thick aluminum top cover, a 1cm thick aluminum bottom plate, a 1cm thick aluminum side wall and a 1cm thick plexiglass side wall. The aluminum side wall is placed behind, the organic glass side wall is placed in front to be convenient for observe, the side wall top is fixed through flange joint with aluminum plate, and the side wall bottom is fixed through flange joint with aluminum plate, wholly constitutes the model groove that length 3m, width 1m, height 1m, wall thickness 3cm. A slide rail 10 with the length of 3m, the width of 1cm and the height of 1cm is arranged at the symmetrical positions of the inner shafts of the aluminum top cover, the aluminum bottom plate and the aluminum side wall respectively, and bolt holes with the height of 2cm and the diameter of 1cm are arranged on the top cover and the bottom plate along the slide rail from outside to inside every 3cm.
Referring to fig. 3, the supporting structure 8 is composed of two U-shaped aluminum plates interlocked, and is fixed at the end of the model groove through bolts, and is used for simulating a lassen steel sheet pile in foundation pit engineering. The U-shaped aluminum plate consists of a web 11 and a flange 12, the overall effective width is 0.5m, the width of the web 11 is 0.3m, the effective height is 0.2m, and the thickness is 2.43cm. Referring to fig. 4, 6 laterally symmetrical bolt holes with diameters of 4cm and thicknesses of 1cm are formed in the web 11, and the centers of the two bolt holes are horizontally separated by 15cm and vertically separated by 25cm, so that leakage holes generated by damage of the supporting structure are simulated. Referring to fig. 5, the water permeable plate 9 is 1m long, 1m wide and 1cm thick, the water permeable plate 9 is connected with the movable water injection device through the pressure pipe 24 and is placed in the model groove, the water permeable plate 9 is respectively provided with a groove with the length of 1cm, the width of 1cm and the thickness of 3cm on three sides of the side wall of the attached top cover, the bottom plate and the aluminum material, and the water permeable plate 9 is matched with the slide rail 10 of the model groove 7, so that the water permeable plate 9 can move in the model groove 7 close to the supporting structure 8 or far away from the supporting structure 8, and the position of the water permeable plate 9 in the model groove can be adjusted to simulate foundation pit supporting structures with different distances close to sea.
Referring to fig. 6, the water-soil separation device includes a pressure pipe 24, a pipe 13, a mixture separation device 14, a liquid storage tank 15, an electronic scale 16, an electronic scale 17, and a filter screen 18. One end of the pressure-resistant pipe 24 is connected with one bolt hole on the supporting structure 8, one end of the pressure-resistant pipe is connected with the mixture separating device 14, one end of the pipeline 13 is connected with the mixture separating device 14, one end of the pipeline is guided to the liquid storage tank 15, and the mixture separating device 14 and the liquid storage tank 15 are respectively arranged on the electronic scale 16 and the electronic scale 17, so that data can be read in real time. The water-soil separation device is used for simulating the conditions of soil seepage and water seepage under the condition that the supporting structure is damaged, and measuring the soil yield and the water yield. The mixture separating device 14 is composed of an upper organic glass cylinder and a lower organic glass cylinder which are 1m in height and 1m in diameter, the upper opening and the lower opening of the organic glass cylinder are respectively provided with an O-shaped silica gel plate for sealing, the upper cylinder and the lower cylinder are provided with flanges and are fixed through bolts, a filter screen 18 with the thickness of 1cm and the diameter of 1m is arranged between the upper cylinder and the lower cylinder, and solid particles at the lower part can be prevented from passing through, so that solid-liquid separation is realized. The liquid flows into the liquid storage tank 15 through the pipeline 13, and the liquid storage tank 15 is composed of four pieces of organic glass with the length of 1m, the width of 1m and the thickness of 3cm, and is a square organic glass groove with an upper opening and a lower opening.
The soil yield and water yield were calculated as follows: knowing the density ρ of the soil s (g/cm 3 ) And density ρ of water w (g/cm 3 ) At t through the electronic scale 16 in the experiment 1 The parameter shown in the moment is marked as M 1 ' at t 2 The time electronic scale 16 is shown as M 1 "C"; electronic scale 17 at t 1 The parameter shown in the moment is marked as M 2 ' at t 2 The time electronic scale 17 is denoted by M 2 ". An expression of the soil discharge amount m in this period can be obtained:expression of water yield Q during this period: />
The monitoring device comprises a miniature pore water pressure gauge 19, a resistance strain gauge 20, a data acquisition device 21 and a computer terminal 22. The micro pore water pressure gauge 19 can measure pore water pressure in soil, the measuring range is 0.01-3mpa, and the diameter is 13mm. The resistive strain gauge 20 measures strain by measuring a change in resistance. The pressure change and the strain can be recorded in real time through the monitoring device. Referring to fig. 7, a micro pore water pressure gauge 19 is arranged on the organic glass cover at intervals of 20cm from left to right and 10m from top to bottom, and the micro pore water pressure gauge 19 is connected to a computer terminal 22 through a data acquisition device 21, so that pore water pressure of recorded water flowing at a specific distance can be monitored in real time. Referring to FIG. 4, a miniature void water pressure gauge 19 is placed on the web 11 at a distance of 12.5cm above the center of the bolt hole; the resistance strain gauge 20 in the horizontal and vertical directions is arranged below each micro pore water pressure gauge, the micro pore water pressure gauge 19 and the resistance strain gauge 20 are connected to the computer terminal 22 through the data acquisition device 21, and the water pressure and the strain in the horizontal and vertical directions of the supporting structure at different positions can be monitored and recorded in real time.
The specific operation process of the test is as follows:
(1) The movable water injection device is connected with the water permeable plate 9 through the pressure-resistant pipe 24 and is placed in the model groove 7, the supporting structure 8 is fixed at the tail end of the model groove 7, the water permeable plate 9 is moved to a specific position away from the supporting structure 8, the distance from the water permeable plate 9 to the supporting structure 8 is recorded, four bolts are respectively inserted into bolt holes of a top cover and a bottom plate on two sides of the water permeable plate 9, two sides of the water permeable plate 9 are fastened, and holes between the water permeable plate 9 and the supporting structure 8 are blocked by the other bolts.
(2) The micro pore water pressure gauge 19 is fixed on the organic glass cover of the model groove 7 and is connected with the computer terminal 22 through the data acquisition device 21.
(3) Filling a model groove 7 with a soil sample, and adding water by a water injection device to slowly saturate the soil sample until the air in the soil sample is completely removed
(4) The dynamic fluctuation pressure is set for the dynamic water injection device to obtain the required dynamic fluctuation water pressure, the dynamic water injection device applies the water pressure which regularly changes along with time into the model groove 7 through the water permeable plate 9 to simulate the fluctuation water pressure change of tide water, the water pressure given by the dynamic water injection device decreases along with the increase of the distance due to the resistance in the soil sample, and the soil sample in the model groove finally acts on the supporting structure 8 due to the pressure change.
(5) The miniature pore water pressure gauge 19 on the model box records the space pressure value in the soil, the data is transmitted to the computer terminal 22 through the data acquisition device 21, the pressure values of different distances from the sea in the soil are observed, and a pressure change curve can be made.
(6) One end of the pressure-resistant pipe 24 is connected with one bolt hole on the supporting structure 8, one end of the pressure-resistant pipe is connected with the mixture separating device 14, the other bolt holes on the supporting structure 8 are all plugged by bolts, the damage condition of the supporting structure is simulated, soil and water in the model groove 7 flow into the water-soil separating device through the holes on the supporting structure 8 due to the pressure effect, the soil and the water flow into the mixture separating device 14 through the pressure-resistant pipe 24, then flow into the water storage tank 15 through the pressure-resistant pipe 24, and the record is recorded at t 1 Parameter M indicated by the time electronic scale 16 1 ' at t 2 Parameter M indicated by the time electronic scale 16 1 "C"; electronic scale 17 at t 1 Time of day parameter M 2 ' at t 2 Parameter M indicated by the time electronic scale 17 2 ". The soil yield can be obtained through the soil yield formula, and the water yield can be obtained through the water yield formula. The amount of soil and water output at the specific location was recorded.
(7) The monitoring device transmits data to a computer terminal 22 through a miniature pore water pressure gauge 19 and a resistance strain gauge 20 on the supporting structure 8, and records the pressure and the strain on the supporting structure 8 in real time. For the measured pressure data and strain data, a pressure profile, a strain profile,
and (5) characterizing the influence of tidal fluctuation changes on the supporting structure.
And (3) finishing a group of experiments, changing the distance between the water permeable plate 9 and the supporting structure 8, and repeating the steps to finish all the experiments.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the invention. Equivalent changes and modifications are intended to be covered by this invention, as equivalents will fall within the scope of the invention.
Claims (1)
1. The model test device for the support structure of the foundation pit in the sea is characterized by comprising a running water injection device, a model box, a water-soil separation device and a monitoring device;
the dynamic water injection device injects water into the model box, and the water is regularly changed in a sine or cosine curve along with time so as to simulate the change of sea waves and tides;
the model box is used for simulating foundation pit supporting structures at different distances close to sea, and soil samples are filled in the model box;
the water-soil separation device is used for simulating the conditions of soil seepage and water seepage under the foundation pit supporting structure, and measuring the soil yield and the water yield;
the monitoring device records the water pressure of water flowing through a certain position in the model box in real time; the monitoring device records the pressure born by the foundation pit supporting structure at different positions and the strain in the horizontal and vertical directions in real time;
the dynamic water injection device comprises an air compressor, a regulating valve, a gas-liquid pump, a plunger system, a water tank and a fluctuation acquisition sensor;
the air compressor is connected with the regulating valve through a flange, the regulating valve is connected with the air-liquid booster pump through a pressure-resistant pipe, the air-liquid booster pump is connected with the plunger system through a pressure-resistant pipe, and the air-liquid booster pump is connected with the water tank through a guide pipe;
when the gas-liquid booster pump works, the piston moves backwards, water in the water tank is sucked into the gas-liquid pump, the one-way valve at the inlet of the gas-liquid pump is opened, and air enters the gas-liquid pump through the pressure-resistant pipe; when the piston moves forwards, a certain pressure is formed on one side of the liquid, a one-way valve at the outlet of the gas-liquid pump is opened, high-pressure water flows out from the outlet, then the high-pressure water is injected into the plunger system through the pressure-resistant pipe, the plunger system utilizes the action of the piston to regularly change the pressure of the high-pressure water along with the time in a sine curve or a cosine curve, so that dynamic fluctuation water pressure is obtained, and then the water is injected into the model box through the pressure-resistant pipe; the model box comprises a model groove, a water permeable plate and a supporting structure;
the mold groove comprises an aluminum top cover, an aluminum bottom plate, an aluminum side wall and an organic glass side wall; the aluminum side wall is arranged at the rear, the organic glass side wall is arranged at the front, the tops of the aluminum side wall and the organic glass side wall are respectively connected and fixed with the aluminum top cover through flanges, and the bottoms of the aluminum side wall and the organic glass side wall are connected and fixed with the aluminum bottom plate through flanges;
the symmetrical positions of the inner shafts of the aluminum top cover, the aluminum bottom plate and the aluminum side wall are respectively provided with a sliding rail with the length of 3m, the width of 1cm and the height of 1cm, and the aluminum top cover and the aluminum bottom plate are provided with a plurality of bolt holes along the sliding rails; the support structure is fixed at the tail end of the model groove through bolts and is used for simulating Larson steel sheet piles in foundation pit engineering; the web plate of the supporting structure is provided with 6 bilaterally symmetrical bolt holes for simulating leakage holes generated by the damage of the supporting structure; the water permeable plate is connected with the movable water injection device through a pressure-resistant pipe and is arranged in the model groove, three grooves are respectively dug on three sides of the attached top cover, the bottom plate and the aluminum side wall of the water permeable plate and are matched with sliding rails of the model groove, so that the water permeable plate can move in the direction of approaching to or separating from the supporting structure in the model groove, and the position of the water permeable plate in the model groove is adjusted to simulate foundation pit supporting structures with different distances approaching to sea;
the water-soil separation device comprises a pressure-resistant pipe, a pipeline, a mixture separation device, a liquid storage tank, two electronic scales and a filter screen;
one end of the pressure-resistant pipe is connected with one bolt hole on the supporting structure, one end of the pressure-resistant pipe is connected with the mixture separating device, one end of the pipeline is guided to the liquid storage tank, and the mixture separating device and the liquid storage tank are respectively arranged on the two electronic scales and read data in real time;
the mixture separating device consists of an upper organic glass cylinder and a lower organic glass cylinder, and a silica gel plate is placed between the upper organic glass cylinder and the lower organic glass cylinder for sealing; the upper organic glass cylinder and the lower organic glass cylinder are provided with flanges and are fixed through bolts, a filter screen is arranged between the upper organic glass cylinder and the lower organic glass cylinder, solid particles at the lower part are prevented from passing through, and solid-liquid separation is realized;
the liquid flows into the liquid storage tank through the pipeline, and the liquid storage tank is composed of four pieces of organic glass and is a cube organic glass groove with an opening at the upper part;
the monitoring device comprises a miniature pore water pressure gauge, a resistance strain gauge, a data acquisition device and a computer terminal;
the miniature pore water pressure gauge is arranged on the organic glass side plate of the model groove, is connected to the computer terminal through the data acquisition and transmission module, and can monitor the pressure of the recorded water flowing through a specific distance in real time;
the supporting structure is uniformly provided with a plurality of micro pore water pressure gauges and a plurality of resistance strain gauges in the horizontal and vertical directions, and the micro pore water pressure gauges and the resistance strain gauges are connected to a computer terminal through a data acquisition device, so that the pressure born by the supporting structure at different positions and the strain in the horizontal and vertical directions can be monitored and recorded in real time.
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| CN106706266A (en) * | 2017-01-25 | 2017-05-24 | 浙江大学 | Dynamic response model test device for submarine tunnel under effect of simulated wave load |
| CN207703640U (en) * | 2017-12-31 | 2018-08-07 | 浙江大学 | A kind of experimental rig that simple harmoinic wave motion boundary head is provided |
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| CN103147420A (en) * | 2013-02-18 | 2013-06-12 | 河海大学 | Test device and method for researching sea wall engineering piping phenomenon |
| CN105525636A (en) * | 2016-01-29 | 2016-04-27 | 浙江大学 | Model test device simulating dynamic responses of near-sea foundation pit under action of wave loads |
| CN106706266A (en) * | 2017-01-25 | 2017-05-24 | 浙江大学 | Dynamic response model test device for submarine tunnel under effect of simulated wave load |
| CN207703640U (en) * | 2017-12-31 | 2018-08-07 | 浙江大学 | A kind of experimental rig that simple harmoinic wave motion boundary head is provided |
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