CN206339363U - A kind of simple underground structure Analysis of Buoyancy model test apparatus - Google Patents
A kind of simple underground structure Analysis of Buoyancy model test apparatus Download PDFInfo
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- CN206339363U CN206339363U CN201621463777.2U CN201621463777U CN206339363U CN 206339363 U CN206339363 U CN 206339363U CN 201621463777 U CN201621463777 U CN 201621463777U CN 206339363 U CN206339363 U CN 206339363U
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Abstract
A kind of simple underground structure Analysis of Buoyancy model test apparatus, is mainly made up of model groove, model room, weight, pore water pressure measurement system, observation system etc..It is characterized in that：Fill out the single soil layer of saturation of different nature or mixed soil respectively in model-container, three group model rooms are buried to different depth, and gradually decrease the ballast for putting on model room's movable floor, make subgrade reaction synchronously reduction, by observation system decision model room movable floor float state, the ballast under this state is determined, you can the buoyancy that rating model room is subject to, and the buoyancy theory value drawn according to Measured pore water pressure is contrasted, for analyzing underground structure buoyancy mechanism.The present apparatus can buoyancy that directly rating model room is subject to, be easy to intuitively analyze underground structure buoyancy mechanism；Model room's buoyancy of three groups of different buried depths can be once determined, test efficiency is higher；Experimental rig simple structure, construction cost is low, and data are reliable, and error is smaller, is adapted to promote the use of.
Description
Technical field
The utility model belongs to Geotechnical Engineering field, is related to a kind of simple underground structure Analysis of Buoyancy model test
Device, is a kind of geotechnological laboratory testing rig, is specifically that the saturation soil body is filled in model groove, and model room is embedded wherein, is led to
The buoyancy that rating model room is subject to is crossed, underground structure buoyancy mechanism is analyzed.
Background technology
Recently as the underground space（Underground station, road tunnel, Underground Urban Complex etc.）Exploitation scale is increased rapidly, ground
The anti-floating problem of lower structure increasingly causes the attention of engineering circles and academia, right particularly in the higher area of level of ground water
In buried depth is shallow and for underground structure that the scale of construction is larger, its Anti-floating design is an influence structure safety and is related to huge cost
Problem.But, due to lacking rational theoretical direction and Underground Structure Buoyancy the complex nature of the problem, how definitely people for
The ununified understanding of buoyancy in lower structure.Different researchers is obtained by theory analysis, laboratory test and field measurement
To conclusion be not quite similar.
From the point of view of existing research, for Underground Structure Buoyancy problem, most important and reliable research meanses are still examination at present
Test.Current buoyancy research most common method is to carry out field test, reflects the big of buoyancy indirectly by determining pore water pressure
It is small.Field test can obtain the more real place pore water pressure regularity of distribution, and the buoyancy suffered by analysis underground structure is carried
For basic data.But, this method unaccountably descends how the pore water pressure of structure position calculates asking for uplift pressure
Inscribe, and field monitoring is wasted time and energy, somewhat expensive.
Utility model content
The utility model purpose is to provide a kind of accuracy that can directly determine buoyancy and improve float state judgement
Simple underground structure Analysis of Buoyancy model test apparatus.
The utility model includes base, model groove, the first model room, the second model room, the 3rd model room, and the base is consolidated
Be scheduled on the outer bottom of the model groove, the model trench bottom sets discharge outlet, in the middle part of the model groove sidewall to bottom according to
Connection pressure-measuring pipe in three pressure taps of secondary setting, the pressure tap；First model room, the second model room, the 3rd model room
It is separately positioned in the model groove, first, second, third model room is supported on the model by supporting rod member respectively
In groove, the height of first, second, third model room is reduced successively, and the upper end of first, second, third model room is in together
One horizontal plane, three pressure-measuring pipes correspond to same plane with the bottom surface of first, second, third model room respectively；Institute
State first, second, third model room includes model room side wall, model room's top board, at least model room's base plate, Liang Gen model rooms respectively
Connecting rod, each model room's connecting rod is fixed between model room's top board, model room's base plate, each model room's connection
The two ends of bar are separately fixed at model room's top board, the medial surface of model room's base plate, and model room's connecting rod surrounds model
Ceiling plate, model room's base plate Central Symmetry are set, and model room's top board is shelved on the upper top of model room side wall, described
Gap is provided between model room's base plate and model room side wall；Weight is set in the upper end of model room's top board, seen
Device is surveyed, the weight is placed on the center of model room's top board, and the observation device is placed on institute by support
State on model room's top board.
The utility model sets water-stop glue band between model room's base plate and model room's side wall side wall, described to stop
Glue band is fixed on model room's bottom edge.
The utility model is fixedly connected using model room's base plate with top board, there is gap between base plate and side wall, using only
Water rubber belt sealing, top board is hung on top side wall.By under buoyancy in experiment, base plate and top board can float, and float wink
Between, according to the balance of power, it can directly determine suffered buoyancy；By the dial gauge being erected on top board observation platform, can directly it see
The displacement that base plate floats is measured, precision reaches 0.01mm, can precisely judge base plate float state.It can increase substantially underground
The precision of structure buoyancy model test.
The utility model two side wall upper parts relative in the model slot length direction set three first connections respectively
Hole, in the model well width direction, two relative side wall upper parts set second connecting hole respectively, in the model room
Uniform four the 3rd connecting holes of side wall upper part, between each first connecting hole and corresponding each 3rd connecting hole respectively
Supported and connected by connecting screw rod, in two the second connecting holes and the 3rd being connected on the same line with second connecting hole
Through a connecting screw rod in hole, the two ends of the connecting screw rod are each passed through two second connecting holes, connecting screw rod end
Portion is fixed by nut.Model room uses above-mentioned fixed form, and its Stability Analysis of Structures does not influence measurement accuracy.
Weight described in the utility model includes measuring cup, the counterweight being filled with water, and the counterweight is placed on the model ceiling
The center of plate, the measuring cup is placed on the counterweight；By finely tuning ballast toward filling in measuring cup or extraction water so that base plate
In suspended state.
Observation device described in the utility model includes observation platform, dial gauge, and observation platform is centrally placed in the model ceiling
Plate center, the observation platform includes four supporting legs, a support flat board, and it is flat that each supporting leg is uniformly fixed on the support
Below plate, the supporting leg is supported on model room's top board；The indicator bracket is located at the support plate center, described
Dial gauge is by support detachable connection in the connecting screw rod.By observing the deflection of observation device percentage list index,
Feel to be extracted to measuring cup or water filling, readily available measurement result.
Model room's connecting rod described in the utility model is four, and model room's connecting rod is in model room's top board
The heart is centrosymmetric arrangement.Four model room's connecting rods so that support more stable between model room's top board and base plate, the company of preventing
Connect loosening and occur unilateral tilt.
The length that pressure-measuring pipe described in the utility model stretches into the model groove inwall is not less than 50mm.This set is terrible
To accurate data.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the present utility model；
Fig. 2 is Fig. 1 top view；
A kind of structural representation of Fig. 3 bit models room；
Fig. 4 bit models room side wall and base plate connection diagram.
Embodiment
As shown in Figure 1,2,3, 4, this simple underground structure Analysis of Buoyancy model test apparatus, including base 4, model groove
1st, the first model room 2-1, the second model room 2-2, the 3rd model room 2-3, base 4 are fixed on the outer bottom of model groove 1, model groove
1 bottom sets discharge outlet 15, and the connection drainpipe 5 of discharge outlet 15 sets gradually three pressure measurement in the middle part of the side wall of model groove 1 to bottom
Connection pressure-measuring pipe 3 in hole 16, pressure tap；First model room 2-1, the second model room 2-2, the 3rd model room 2-3 are separately positioned on
In model groove 1, first, second, third model room 2-1,2-2,2-3 is supported in model groove 1 by supporting rod member respectively, the
First, second, third model room 2-1,2-2,2-3 height is reduced successively, first, second, third model room 2-1,2-2,2-3's
Upper end is in same level, and bottom surface of three pressure-measuring pipes 3 respectively with first, second, third model room 2-1,2-2,2-3 is corresponding
In same plane；First, second, third model room 2-1,2-2,2-3 respectively include model room side wall 12, model room's top board 11,
Model room's base plate 10, at least Liang Gen model rooms connecting rod 13, each model room's connecting rod 13 are fixed on model room's top board 11, model room
Between base plate 10, the two ends of each model room's connecting rod 13 are separately fixed at model room's top board 11, the medial surface of model room's base plate 10,
Model room's connecting rod 13 is set around model room's top board 11, the Central Symmetry of model room's base plate 10, and model room's top board 11 is shelved on mould
The upper top of type room side wall 12, is provided with gap, base plate 10 and mould in model room between model room's base plate 10 and model room side wall 12
Water-stop glue band 14 is set between type room side wall 12, and water-stop glue band 14 is fixed on the edge of model room's base plate 10；The top board 11 in model room
Upper end weight 7 is set, observation device 17, weight 7 is placed on the center of model room's top board 11, observation device 17
It is placed on by support on model room's top board 11.
Three the first connecting holes 18 are set respectively in two relative side wall upper parts of the length direction of model groove 1, in model groove 1
Two relative side wall upper parts of width set second connecting hole 19 respectively, uniform four on model room Ce Bi12 tops
3rd connecting hole 20, is supported by connecting screw rod 6 respectively between each first connecting hole 18 and corresponding each 3rd connecting hole 20
Connection, two the second connecting holes 19 and with the 3rd connecting hole 20 of the second connecting hole 19 on the same line in through a company
Screw rod 6 is connect, the two ends of connecting screw rod 6 are each passed through two the second connecting holes 19, and the end of connecting screw rod 6 is fixed by nut.
Weight 7 includes measuring cup 21, the counterweight 22 being filled with water, and counterweight 22 is placed on the center of model room's top board 11, measuring cup
21 are placed on counterweight 22；By finely tuning ballast toward filling in measuring cup 21 or extraction water so that model room's base plate 10 is in outstanding
Floating state.
Observation device 17 includes observation platform 8, dial gauge 9, and observation platform 8 is centrally placed in the center of model room's top board 11, observes
Frame 8 includes four supporting legs 23, a support flat board 24, and each supporting leg 23 is uniformly fixed on the lower section of support flat board 24, supporting leg
23 are supported on model room's top board 11；Dial gauge 9 is erected at support flat board 24 center, and dial gauge 9 passes through the detachable company of support
It is connected in connecting screw rod 6.
Model room's connecting rod 13 is four, and model room's connecting rod 13 is centrosymmetric cloth around the center of model ceiling plate 11
Put.
The length that pressure-measuring pipe 3 stretches into model groove inwall is not less than 50mm.This set is in order to obtain accurate data.
The operating procedure of the experimental rig is as follows：
（1）Base is placed steady, model groove 1 is placed on base, and placement level is checked whether with horizon rule；
（2）Pressure-measuring pipe 3 is installed at the short brink wall reserving hole of model groove 1, it is not small that pressure-measuring pipe 3 rises up into the inwall of model groove 1
In 50mm；
（3）The water discharging valve of model groove 1 is closed, water is filled in model groove 1, checks that the installation hole of pressure-measuring pipe 3, osculum are
No leak, and examine waterpower connection in pressure-measuring pipe whether unimpeded.After inspection is finished, water discharging valve is opened, the water of model groove 1 is arranged
To the greatest extent；
（4）Sealing adhesive plaster 14 is wrapped in the side wall of model room's base plate 10, winding thickness slightly larger than model room's base plate 11 with
Gap between model room side wall 12, and the painting lubricant at the inside contact surface of sealing adhesive plaster 14 and model room side wall 12；
（5）By reserving hole, model room 2-1,2-1,2-3 are fixed on model groove 1 with screw rod and bolt, it is ensured that three
The individual bottom surface of model room's base plate 10 is with corresponding pressure-measuring pipe 3 in same level；
（6）Counterweight and the measuring cup being filled with water uniformly are placed on the center of model room's top board 11；
（7）The soil body is filled between model groove 1 and model room 2-1,2-2,2-3（Sandy soil, silt, clay etc.）, layering rammer
Fill in fact；
（8）Fill after finishing, water will be filled in model groove 1, water discharging valve to be opened has stationary flow outflow, and pressure measurement
When the head of pipe 3 is accordingly reduced, it is believed that filling soil solidifying is finished, water discharging valve is closed, and determined in now model groove 1 with steel ruler
Height of water level；
（9）Observation platform 8 is placed on the center of model room's top board 11, whether top circular iron plate is observed with horizon rule inspection
Level, checks and finishes round iron plate center rear and that dial gauge 9 is erected to observation platform 8, and return to zero；
（10）Counterweight is constantly reduced, when closing on floating state, ballast is finely tuned by extracting the water in measuring cup, observes percentage
Whether the pointer of table 9 rotates, when finding indicators turn, by being extracted and reinjected water into measuring cup, makes the pointer of dial gauge 9 small next
Back rotation, records now ballast and piezometric head highly.
Claims (7)
1. a kind of simple underground structure Analysis of Buoyancy model test apparatus, it is characterised in that including base, model groove, the first mould
Type room, the second model room, the 3rd model room, the base are fixed on the outer bottom of the model groove, and the model trench bottom is set
Discharge outlet is put, connection pressure-measuring pipe in three pressure taps, the pressure tap is set gradually to bottom in the middle part of the model groove sidewall；
First model room, the second model room, the 3rd model room are separately positioned in the model groove, and described first, second, third
Model room is supported in the model groove by supporting rod member respectively, and the height of first, second, third model room drops successively
Low, the upper end of first, second, third model room is in same level, three pressure-measuring pipes respectively with described first, the
2nd, the bottom surface of the 3rd model room corresponds to same plane；First, second, third model room respectively include model room side wall,
Model room's top board, at least model room's base plate, Liang Gen model rooms connecting rod, each model room's connecting rod are fixed on the model room
Between top board, model room's base plate, the two ends of each model room's connecting rod are separately fixed at model room's top board, model room bottom
The medial surface of plate, model room's connecting rod is set around model room's top board, model room's base plate Central Symmetry, the model ceiling
Plate is shelved on the upper top of model room side wall, and gap is provided between model room's base plate and model room side wall；
The upper end of model room's top board sets weight, and observation device, the weight is placed on model room's top board
Center, the observation device is placed on model room's top board by support.
2. a kind of simple underground structure Analysis of Buoyancy model test apparatus according to claim 1, it is characterised in that
Water-stop glue band is set between model room's base plate and model room's side wall side wall, and the water-stop glue band is fixed on the model
Room bottom edge.
3. a kind of simple underground structure Analysis of Buoyancy model test apparatus according to claim 1, it is characterised in that
Two relative side wall upper parts of the model slot length direction set three the first connecting holes respectively, in the model well width side
One the second connecting hole is set respectively to two relative side wall upper parts, in uniform four the 3rd companies of model room's side wall upper part
Hole is connect, is supported and connected by connecting screw rod respectively between each first connecting hole and corresponding each 3rd connecting hole,
Two the second connecting holes and with the 3rd connecting hole of second connecting hole on the same line in through connecting screw rod,
The two ends of the connecting screw rod are each passed through two second connecting holes, and connecting screw rod end is fixed by nut.
4. a kind of simple underground structure Analysis of Buoyancy model test apparatus according to claim 1, it is characterised in that institute
Measuring cup, counterweight that weight includes being filled with water are stated, the counterweight is placed on the center of model room's top board, and the measuring cup is placed
On the counterweight.
5. a kind of simple underground structure Analysis of Buoyancy model test apparatus according to claim 1, it is characterised in that institute
Stating observation device includes observation platform, dial gauge, and observation platform is centrally placed in model room's top board center, and the observation platform includes
Four supporting legs, a support flat boards, each supporting leg are uniformly fixed on below the support flat board, the supporting leg support
On model room's top board；The indicator bracket is located at the support plate center, and the dial gauge is detachable by support
Formula is connected in the connecting screw rod.
6. a kind of simple underground structure Analysis of Buoyancy model test apparatus according to claim 1, it is characterised in that institute
Model room's connecting rod is stated for four, model room's connecting rod is centrosymmetric arrangement around the center of model room's top board.
7. a kind of simple underground structure Analysis of Buoyancy model test apparatus according to claim 1, it is characterised in that institute
State pressure-measuring pipe and stretch into the length of the model groove inwall not less than 50mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621463777.2U CN206339363U (en) | 2016-12-29 | 2016-12-29 | A kind of simple underground structure Analysis of Buoyancy model test apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621463777.2U CN206339363U (en) | 2016-12-29 | 2016-12-29 | A kind of simple underground structure Analysis of Buoyancy model test apparatus |
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| CN206339363U true CN206339363U (en) | 2017-07-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621463777.2U Expired - Fee Related CN206339363U (en) | 2016-12-29 | 2016-12-29 | A kind of simple underground structure Analysis of Buoyancy model test apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110685302A (en) * | 2019-09-30 | 2020-01-14 | 同济大学 | Underground structure buoyancy test device capable of eliminating side wall friction resistance influence |
| CN116486672A (en) * | 2023-04-26 | 2023-07-25 | 南京工业大学 | Underground structure still water buoyancy model test device |
-
2016
- 2016-12-29 CN CN201621463777.2U patent/CN206339363U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110685302A (en) * | 2019-09-30 | 2020-01-14 | 同济大学 | Underground structure buoyancy test device capable of eliminating side wall friction resistance influence |
| CN116486672A (en) * | 2023-04-26 | 2023-07-25 | 南京工业大学 | Underground structure still water buoyancy model test device |
| CN116486672B (en) * | 2023-04-26 | 2023-12-05 | 南京工业大学 | Underground structure still water buoyancy model test device |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170718 Termination date: 20181229 |
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| CF01 | Termination of patent right due to non-payment of annual fee |