CN207081620U - Foundation Pit bottom stability test device containing artesian water stratum - Google Patents
Foundation Pit bottom stability test device containing artesian water stratum Download PDFInfo
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- CN207081620U CN207081620U CN201720463569.0U CN201720463569U CN207081620U CN 207081620 U CN207081620 U CN 207081620U CN 201720463569 U CN201720463569 U CN 201720463569U CN 207081620 U CN207081620 U CN 207081620U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 238000013112 stability test Methods 0.000 title claims abstract description 16
- 239000002689 soil Substances 0.000 claims abstract description 35
- 238000002474 experimental method Methods 0.000 claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 230000006835 compression Effects 0.000 claims abstract description 11
- 238000007906 compression Methods 0.000 claims abstract description 11
- 239000008400 supply water Substances 0.000 claims abstract description 4
- 239000010410 layer Substances 0.000 claims abstract 6
- 239000002344 surface layer Substances 0.000 claims abstract 2
- 238000006073 displacement reaction Methods 0.000 claims description 30
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 description 10
- 239000004927 clay Substances 0.000 description 6
- 238000011068 loading method Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000009412 basement excavation Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000005336 safety glass Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009658 destructive testing Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A kind of Foundation Pit bottom stability test device containing artesian water stratum, including model casing, wall interior panel and compression system, wall interior panel is located in model casing, pressurization storehouse surrounds model casing, the laying experiment soil body in model casing, in the experiment soil body, the experiment soil body surface layer in wall interior panel is monitor layer for the bottom of wall interior panel, layout data acquisition system on monitor layer；In compression system, pressurization storehouse surrounds model casing, and pressurization storehouse top is provided with water inlet pipe and valve, and the bottom in storehouse of pressurizeing is provided with delivery port, and water inlet pipe is blocked using closed nut；Valve is connected with air pump；Model lower box part, which is provided with to be used to supply water, penetrates into model casing while prevents to test the anti-filter plate that the soil body enters pressurization storehouse, and the water level in storehouse of pressurizeing is higher than the top of anti-filter plate, and the bottom of wall interior panel is higher than the top of anti-filter plate.The utility model provides a kind of good effect, easy to operate, short time limit, the low Foundation Pit bottom stability test device containing artesian water stratum of expense.
Description
Technical field
The Foundation Pit bottom stability test device containing artesian water stratum is the utility model is related to, is primarily adapted for use in indoors
Influence research in experiment under different bearing course hydraulic conditions to Foundation Pit bottom stability, belongs to engineering test technical field.
Background technology
The exploitation of the underground space is an important trend of urban development, and this be unable to do without the excavation of foundation ditch and gone along with sb. to guard him.
In excavation of foundation pit, because hole bottom top soil pressure is gradually reduced, hole bottom is easily caused in the presence of the following artesian water of bottom of foundation ditch
Protuberance, the prominent generation for the engineering accident such as gushing, and foundation ditch open that hole depth is bigger, and problem is more serious.It is stable in order to evaluate Foundation Pit bottom
Property, it is necessary to study the hole bottom displacement under the conditions of different artesian pressures, give Practical Project to provide reliable data.Due to
Substrate stability test is destructive testing, it is difficult to tested in engineering site, and with complex procedures, costly, duration
The deficiencies of long,
The content of the invention
In order to overcome the shortcomings of the complex procedures of existing Foundation Pit bottom estimation of stability mode, costly, long in time limit, this reality
With a kind of effect of new offer is good, easy to operate, short time limit, the low Foundation Pit bottom stability containing artesian water stratum of expense are surveyed
Trial assembly is put.
Technical scheme is used by the utility model solves its technical problem：
A kind of Foundation Pit bottom stability test device containing artesian water stratum, including model casing, wall interior panel, compression system
And data collecting system, the wall interior panel are located in the model casing, the compression system surrounds the model casing, the mould
The laying experiment soil body in molding box, the bottom of the wall interior panel is in the experiment soil body, the experiment soil body in the wall interior panel
Superficial layer is monitor layer, layout data acquisition system on the monitor layer；
The compression system includes pressurization storehouse, air pump, water inlet pipe, delivery port, valve and closed nut, the pressurization Cang Bao
Model casing is surrounded, the pressurization storehouse top is provided with water inlet pipe and valve, and the bottom in the pressurization storehouse is provided with delivery port, the water inlet
Pipe is blocked using closed nut；The valve is connected with air pump；
The model lower box part is provided with to be used to supply water and penetrates into model casing while prevent the experiment soil body from entering pressurization storehouse
Anti-filter plate, the water level in the pressurization storehouse are higher than the top of the anti-filter plate, and the bottom of the wall interior panel is higher than the anti-filter plate
Top.
Further, the model casing is the cuboid of top uncovered, and the model casing includes pillar, clamp and anti-filter plate,
The model casing corner is provided with the pillar for being used for supporting and increase globality, and the both ends of the clamp are connected with pillar respectively, institute
Place anti-filter plate in the bottom for stating clamp.
Further, the valve is connected by stainless steel interface with current divider, and the current divider passes through air valve and air pump
Connection.
Further, the data collecting system includes LVDT displacement meters, magnetic stand, crossbeam and data collecting instrument, institute
State crossbeam to be located on model casing, magnetic stand is fixed on the crossbeam, the magnetic stand is connected with LVDT displacement meters, described
LVDT displacement meter arrays are distributed on the monitor layer, and the LVDT displacement meters are connected with the data collecting instrument.
The rubber blanket wraps up the top of the flexible pin of the LVDT displacement meters, the soil body of the rubber blanket and the monitor layer
Contact.
The data collecting instrument is connected with the computer control system, and the computer control system includes being used in real time
Gather LVDT displacement meters, air pressure and hydraulic pressure data, the test module that Mobile state of going forward side by side is handled in real time.
Technical concept of the present utility model is：It is to carry out Foundation Pit bottom stability under artesian water stratum to survey using laboratory test
The effective means of examination, the Foundation Pit bottom stability test device on artesian water stratum provided by the utility model, can effectively be commented
Valency contains the Foundation Pit bottom stability on artesian water stratum, and has the characteristics of good effect, easy to operate, short time limit, low expense.
The beneficial effects of the utility model are mainly manifested in：(1) water-gas combined pressurization.Joined in storehouse of pressurizeing using gas and water
The mode of pressurization is closed, the size of artesian head is controlled by controlling the air pressure above the water surface.Water consumption is not only reduced, also gram
The problem for being difficult to apply high pressure is taken.(2) bearing course stable water pressure is high.Model casing is pressurized storehouse and is enclosed in centre, using anti-
Filter plate connects, and increases contact area, improves the coverage of artesian water.Pressurization communicates inside storehouse, and the air pressure on the water surface begins
Last phase is same, and water level is consistent in storehouse, and water pressure is also identical, so the water pressure inside bearing course keeps identical, improves hydraulic pressure
Stability and test effect.(3) displacement measurement mode is reliable.During experiment, by each monitoring point in monitoring grid
Monitored in real time, and carry out pit accident displacement using computer and recorded and shown in real time, obtain different pressure-bearing water bars
The deformation rule of the part hole front and rear hole bottom surface of bottom seepage erosion, test basis and Engineering Guidance are provided for field engineering.(4) operation letter
List, expense is low, the time is short, reliability is high.According to the actual conditions of engineering site, experimental rig can be carried out as needed indoors
Assembling, process is simple, and the testing time is short, and reliability is high；Each part is repeatable to be utilized, and expense is low.
Brief description of the drawings
Fig. 1 is the structural representation of the Foundation Pit bottom stability test device containing artesian water stratum.
Fig. 2 is model casing top view.
Fig. 3 is monitoring net trrellis diagram.
Embodiment
The utility model is further described below in conjunction with the accompanying drawings.
1~Fig. 3 of reference picture, a kind of Foundation Pit bottom stability test device containing artesian water stratum, including pressurization storehouse 1；
Model casing 2；Wall interior panel 3；Test the soil body 4 (including the 41, silt clay 42 that bankets, sand 43, clay 44)；Pillar 5；Clamp 6；
Anti-filter plate 7；Water inlet pipe 8；Closed nut 9；Delivery port 10；Water valve 11；Water 12；Air pump 13；Air valve 14；Current divider 15；Tracheae 16；
Barometer 17；Stainless steel interface 18；Valve 19；Crossbeam 20；Magnetic stand 21；LVDT displacement meters 22；Rubber blanket 23；Monitoring point
24；Data collecting instrument 25 and computer control system 26.
The wall interior panel 3 is located in the model casing 2, and the pressurization storehouse 1 surrounds the model casing 2, the model casing 2
The interior filling test soil body 4, the bottom of the wall interior panel 3 is in the experiment soil body 4, the experiment soil body in the wall interior panel 3
Superficial layer is monitor layer, layout data acquisition system on the monitor layer；
The compression system is made up of pressurize storehouse 1, air pump 13, water inlet pipe 8, delivery port 10, valve 19 and closed nut 9,
The pressurization storehouse 1 surrounds model casing 2, and the pressurization top of storehouse 1 is provided with water inlet pipe 8 and valve 19, described to pressurize under storehouse 1
Portion is provided with delivery port 10, and the water inlet pipe 8 is blocked using closed nut 9；The valve is connected with air pump；
The bottom of model casing 2 is provided with to be used to supply water and penetrates into model casing while prevent the experiment soil body from entering pressurization storehouse
Anti-filter plate 7, the water level in the pressurization storehouse 1 are higher than the top of the anti-filter plate 7, and the bottom of the wall interior panel 3 is higher than the anti-filter
The top of plate 7；
Wherein, pressurization storehouse 1 surrounds model casing 2, can complete the exchange of water 12 by anti-filter plate 7 therebetween.Model
The corner of case 2 is provided with pillar 5, and pillar 5 is provided with clamp 6, and anti-filter plate 7 can be placed on clamp 6.Water inlet pipe 8 and closing spiral shell
Using threaded connection between mother 9, complete to connect by stainless steel interface 18 between tracheae 16 and valve 19, current divider 15 connects
Air pump 13 and tracheae 16, completes air flow.In the both ends incorporation model 1 of crossbeam 20, for placing magnetic stand 21.Rubber
Pad 23 is provided with groove, for being embedded in the pointer head of LVDT displacement meters 22.LVDT displacement meters 22 use data wire with data collecting instrument 25
Transmission signal, then data conversion is transferred to computer control system 26.
The test device of the present embodiment includes model casing, wall interior panel, compression system and the part of data collecting system four.It is described
Model casing is made up of transparent safety glass, the cuboid of top uncovered, including pillar, clamp, anti-filter plate composition.In corner
There is the pillar for supporting and increasing globality, clamp is connected with pillar, for placing anti-filter plate.Anti-filter plate and clamp have 4
Block, positioned at the surrounding of inwall model casing.The wall interior panel is the rectangular-box of upper and lower uncovered.The compression system is by storehouse, the gas of pressurizeing
Pump, stainless steel interface, air valve, barometer, water inlet pipe, delivery port, valve, closed nut, water etc. form.Pressurization storehouse surrounds mould
Molding box, it is made up of safety glass, and using angle steel reinforced to improve bulk strength.Storehouse top pressurize by 1 water inlet pipe and 4 gas
Door composition, 1 delivery port is left in bottom.Water inlet pipe and delivery port are used as the water level control in pressurization storehouse, are sealed using closed nut
It is stifled；Gas port is used for air exchange, and is mechanically connected using stainless steel interface and air pump, improves seal.Air valve is used to control and added
Press air pressure in storehouse.The data collecting system is by LVDT displacement meters, rubber blanket, magnetic stand, crossbeam and data collecting instrument
Composition.The flexible pin top of rubber blanket parcel displacement meter, for pointer to be isolated with the soil body, protects displacement meter, and rubber blanket carries
The high monitoring range of displacement meter.Crossbeam is located on model casing, for fixing magnetic stand.The computer data acquisition system
Interior band software, can gather the data such as LVDT displacement meters and air pressure, hydraulic pressure in real time, and Mobile state of going forward side by side is handled in real time.
In the present embodiment, the proposed subway gateway of certain base pit engineering, foundation ditch is integrally presented rectangle, length and width depth of about
50m、30m、10m.Using diaphram wall as building enclosure, depth 20m, thickness 1m.Site soil layers are from top to bottom successively
Be banket, silt clay, sand, clay thickness are respectively 2m, 15m, 5m, 10m, wherein sand is artesian aquifer.This examination
Test and use the Jing Yin air pump of oil-free, maximum can apply 0.5MPa air pressure.The box house size of this test model case is
1500mm×1000mm×900mm。
The implementation steps of method of testing of the present utility model are：
1) determine to go along with sb. to guard him board size, shape.Wall interior panel can according to the shape of foundation ditch in Practical Project, go along with sb. to guard him form and determine,
Shape can be rectangle, circle, polygon etc., and plastics and steel can be selected in material.Foundation ditch uses diaphram wall in the present embodiment
Form, so replacement of the wall interior panel using hard plastic board thick 10mm, size is according to Practical Project 50:1 ratio contracting
Put, length, width and height take 1m, 0.6m, 0.4m respectively.
2) foundation depth and thickness are determined.According to live survey report and select representative soil layer as this experiment
Soil layer, each the thickness of the layer is according to 50：1 proportional zoom, laboratory experiment soil layer be successively from top to bottom banket, Muddy Bottoms
Silty clay, sand, clay, thickness are respectively 0.04,0.3m, 0.1m, 0.2m, foundation depth 0.2m,.
3) layering laying soil layer, buries wall interior panel.According to the distribution of soil layer and its thickness, by each soil layer according to from bottom to top
Order be layered laying successively.When being routed to the position of wall interior panel, wall interior panel assembly is placed to the centre position of model casing.
Continue to lay soil layer, the soil body is laid by the order outside back plate in first plate.Top and bottom per layer soil body are carried out with horizon rule
Measure, ensure laying levelness, and require that laying soil layer is likely to be breached the engineering specifications at scene.
4) monitoring grid is divided.Because swelling, dashing forward and gush for the soil body is likely to occur at any one place at Foundation Pit bottom
Engineering accident, so using the method in the equidistant grid division line of vertical, horizontal, and using intersection point as displacement measuring point.This
The horizontal spacing of experiment grid lines is 20cm, longitudinal pitch 15cm, as 5 × 4 grids, and 12 monitoring points, can use note altogether
Number pen depicts grid lines in bottom of foundation ditch.
5) installation data acquisition system.Cross beam movement is used by magnetic force to corresponding position according to the position of monitoring net ruling
Rubber blanket is arranged on LVDT displacement meter pointers end by LVDT displacement meter fixed cross beams by gauge stand.Adjust displacement meter support
Make rubber blanket and monitoring point perpendicular contact, ensure the Measurement reliability of hole subsoil upwaarping deformation.
6) water and connection air pump are added.Because pressurization storehouse is relatively closed space, connected using water inlet pipe and valve with extraneous
Connect.By water inlet pipe toward suitable quantity of water is injected in pressurization storehouse, more than anti-filter plate 0.1m positions, specific height can pass through water inlet pipe
On graduation mark be controlled.After stable level, water inlet pipe is sealed using closed nut, then by air pump and not
The steel sealing joint that becomes rusty connects.
7) determination of pressure-loaded rank.This maximum hydraulic pressure force value tested is determined according to the hydraulic pressure of actual bearing course.
It is 500kPa that hydraulic pressure is estimated in this example, according to 50:1 scale smaller, i.e. 10kPa.Divide 5 loadings, every time loading ladder
Spend for 2kPa.
8) air pressure-loading rank is determined.By air pump to being pressurizeed in pressurization storehouse, because the water level in storehouse of pressurizeing keeps constant, because
This can control the head pressure of artesian water by adjusting air pressure size.In this example, head difference is about 1kPa, so air pressure
1kPa is pressurised into first, and pressurize 2kPa every time afterwards.
9) air pressure is loaded.Observe and record the initial pressure reading on barometer.Open air valve, using air pump to pressurization storehouse
Middle conveying air simultaneously watches barometrical pressure value.Air valve is closed when pressure value is increasing 2kPa on initial pressure, ensures to add
Pressure is in pressure constant state inside storehouse.
10) upwaarping deformation monitors.Bottom heave gradually increases during air pressure-loading, using LVDT displacement meters to cheating bottom
Vertical upwaarping deformation is measured and recorded.
11) air pressure is adjusted.Air valve is opened, and is pressurizeed using air pump, increase air pressure maintains pressure not to next rank
Become.After treating stable gas pressure, the change in displacement at monitoring and record pit bottom.
12) experiment stops.The situation of Real Time Observation Foundation Pit bottom soil body surface in experimentation, when hole, basal surface starts
Stop loading during existing seepage erosion.
13) data preparation.Vertical displacement using computer according to 12 mesh points, draw discharge pressure and the deformation of hole bottom
Graph of a relation；When experiment process is terminated, it may be determined that the critical value of foundation ditch artesian water.
14) experimental rig is dismantled.After pressurization storehouse pressure release to atmospheric pressure, water valve is opened, using delivery port by pressurization storehouse
Water discharge.Remove in order and wipe related component, the soil body is so as to use next time in recovery models case.
Claims (6)
- A kind of 1. Foundation Pit bottom stability test device containing artesian water stratum, it is characterised in that：Including model casing, go along with sb. to guard him Plate, compression system and data collecting system, the wall interior panel are located in the model casing, and the compression system surrounds the mould Molding box, the interior laying experiment soil body of the model casing, the bottom of the wall interior panel is in the experiment soil body, in the wall interior panel Experiment soil body surface layer be monitor layer, layout data acquisition system on the monitor layer；The compression system includes pressurization storehouse, air pump, water inlet pipe, delivery port, valve and closed nut, and the pressurization storehouse surrounds Model casing, the pressurization storehouse top are provided with water inlet pipe and valve, and the bottom in the pressurization storehouse is provided with delivery port, and the water inlet pipe makes Blocked with closed nut；The valve is connected with air pump；The model lower box part, which is provided with to be used to supply water, penetrates into model casing while prevents to test the anti-filter that the soil body enters pressurization storehouse Plate, the water level in the pressurization storehouse are higher than the top of the anti-filter plate, and the bottom of the wall interior panel is higher than the top of the anti-filter plate.
- 2. the Foundation Pit bottom stability test device containing artesian water stratum as claimed in claim 1, it is characterised in that：It is described Model casing is the cuboid of top uncovered, and the model casing includes pillar, clamp and anti-filter plate, and the model casing corner, which is provided with, to be used In the pillar for supporting and increasing globality, the both ends of the clamp are connected with pillar respectively, and anti-filter is placed in the bottom of the clamp Plate.
- 3. the Foundation Pit bottom stability test device containing artesian water stratum as claimed in claim 1 or 2, it is characterised in that： The valve is connected by stainless steel interface with current divider, and the current divider is connected by air valve with air pump.
- 4. the Foundation Pit bottom stability test device containing artesian water stratum as claimed in claim 1 or 2, it is characterised in that： The data collecting system includes LVDT displacement meters, magnetic stand, crossbeam and data collecting instrument, and the crossbeam is located at model casing On, magnetic stand is fixed on the crossbeam, the magnetic stand is connected with LVDT displacement meters, the LVDT displacement meters array point On the monitor layer, the LVDT displacement meters are connected cloth with the data collecting instrument.
- 5. the Foundation Pit bottom stability test device containing artesian water stratum as claimed in claim 4, it is characterised in that：Rubber Pad wraps up the top of the flexible pin of the LVDT displacement meters, and the rubber blanket contacts with the soil body of the monitor layer.
- 6. the Foundation Pit bottom stability test device containing artesian water stratum as claimed in claim 1 or 2, it is characterised in that： The data collecting instrument is connected with computer control system, and it is gentle that the computer control system includes being used for collection displacement in real time Pressure, hydraulic pressure data, the test module that Mobile state of going forward side by side is handled in real time.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720463569.0U CN207081620U (en) | 2017-04-28 | 2017-04-28 | Foundation Pit bottom stability test device containing artesian water stratum |
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| CN201720463569.0U CN207081620U (en) | 2017-04-28 | 2017-04-28 | Foundation Pit bottom stability test device containing artesian water stratum |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106996902A (en) * | 2017-04-28 | 2017-08-01 | 浙江科技学院 | Foundation Pit bottom stability test device containing artesian water stratum |
| CN108594878A (en) * | 2018-04-22 | 2018-09-28 | 北京工业大学 | A kind of device accurately controlling shield model test excavation face supporting power |
| CN112365782A (en) * | 2020-11-03 | 2021-02-12 | 浙大城市学院 | Gas-containing soil deformation experiment model system and experiment method |
-
2017
- 2017-04-28 CN CN201720463569.0U patent/CN207081620U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106996902A (en) * | 2017-04-28 | 2017-08-01 | 浙江科技学院 | Foundation Pit bottom stability test device containing artesian water stratum |
| CN106996902B (en) * | 2017-04-28 | 2023-10-13 | 浙江科技学院 | Foundation pit bottom stability testing device containing pressure-bearing water stratum |
| CN108594878A (en) * | 2018-04-22 | 2018-09-28 | 北京工业大学 | A kind of device accurately controlling shield model test excavation face supporting power |
| CN108594878B (en) * | 2018-04-22 | 2021-06-25 | 北京工业大学 | Device for accurately controlling shield model test excavation face supporting force |
| CN112365782A (en) * | 2020-11-03 | 2021-02-12 | 浙大城市学院 | Gas-containing soil deformation experiment model system and experiment method |
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