CN109580374A - Evaluate the continuous wall trench underground of layer of sand containing artesian water Centrifugal Model Test for Stability device - Google Patents
Evaluate the continuous wall trench underground of layer of sand containing artesian water Centrifugal Model Test for Stability device Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 239000004576 sand Substances 0.000 title claims abstract description 42
- 238000012360 testing method Methods 0.000 title claims abstract description 38
- 238000006073 displacement reaction Methods 0.000 claims abstract description 21
- 239000011148 porous material Substances 0.000 claims abstract description 18
- 238000013480 data collection Methods 0.000 claims abstract description 10
- 230000001133 acceleration Effects 0.000 claims abstract description 9
- 238000004088 simulation Methods 0.000 claims abstract description 9
- 238000011156 evaluation Methods 0.000 claims abstract description 7
- 238000005286 illumination Methods 0.000 claims abstract description 5
- 239000002689 soil Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 21
- 239000010959 steel Substances 0.000 claims description 21
- 238000002360 preparation method Methods 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 7
- 210000002421 cell wall Anatomy 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 4
- 239000011521 glass Substances 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000004927 clay Substances 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 238000007596 consolidation process Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 241001269238 Data Species 0.000 description 2
- 230000001066 destructive effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/18—Bulkheads or similar walls made solely of concrete in situ
- E02D5/187—Bulkheads or similar walls made solely of concrete in situ the bulkheads or walls being made continuously, e.g. excavating and constructing bulkheads or walls in the same process, without joints
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/064—Special adaptations of indicating or recording means with hydraulic indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/066—Special adaptations of indicating or recording means with electrical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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- G01N2203/0611—Hydraulic or pneumatic indicating, recording or sensing means
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- G01N2203/0617—Electrical or magnetic indicating, recording or sensing means
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- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
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Abstract
The present invention discloses a kind of evaluation layer of sand containing artesian water continuous wall trench underground Centrifugal Model Test for Stability device, including model casing, water pressure control system, data collection system and camera system, and it is carried out under centrifuge test system, model casing front side board embeds organic glass observation window convenient for observation experimental phenomena, and back side panel is equipped with the slot hole of embedded pore water pressure sensor；Water pressure control system is pressurizeed by oil pump to water tank, and water is injected layer of sand from water tank to realize simulation layer of sand containing artesian water；Data collection system includes pore water pressure sensor, laser displacement gauge and CPT；Camera system is equipped with LED illumination lamp, high-definition digital camera and high-definition camera；The unstability of diaphram wall support system is induced into and evaluating its grooving stability by control hydraulic pressure and centrifugal acceleration.The present invention has advantage easy to operate, vdiverse in function, simulation precision is high.
Description
Technical field
The invention belongs to During Geotechnical Tests studying technological domain, in particular to a kind of evaluation diaphram wall of layer of sand containing artesian water
Grooving Centrifugal Model Test for Stability device.
Background technique
During underground space development, diaphram wall is provided simultaneously with antiseepage since its construction noise is small, earth-retaining and
The effects of load-bearing and be suitable for deep-foundation pit engineering the characteristics of and by favor.But at present for the grooving of ultra-deep underground continuous wall
Stability study is not mature enough, and especially often encounters layer of sand containing artesian water when slot section cutting depth is larger.
It is at present based on previous engineering experience or foundation mostly to the checking computations of continuous wall trench underground stability
Meyerhof GG(1972) propose the Stability Checking formula provided according to foundation bearing force mode.But the formula is only fitted
Clay ground is saturated for homogeneous and does not consider influence of the artesian water to stability, differs larger with actual condition.Thus should
Simplify the applicability of check formula in practice and receives certain query.Therefore, continuous wall trench underground stability is carried out
Research has important theoretical value and realistic meaning.
Centrifugal model test is the test simulation carried out under the conditions of generating certain acceleration by centrifuge, and being can be with
Restore a kind of test method of the in-situ stress state of the soil body.Thus more compared to the indoor model test under the conditions of 1 g
Close to scene actual condition.In addition, indoor centrifugal test has cost small compared to field test, repeatability is strong and tests ginseng
The advantages that number is easily controllable is more suitable for carrying out systematic research to continuous wall trench underground stability.
Summary of the invention
The technical problem to be solved by the present invention is to provide, one kind is vdiverse in function, precision is high, evaluation easy to use contains
Artesian water layer of sand continuous wall trench underground Centrifugal Model Test for Stability device.
For the technical problem more than solving, the present invention provides a kind of evaluation continuous wall trench undergrounds of layer of sand containing artesian water
Centrifugal Model Test for Stability device, including
Model casing, including removable side panel, front side board embed observation window, and back side panel is equipped with embedded pore water pressure sensor
Slot hole, steel shoe be inserted into the soil body sample preparation mud pit reserve card slot in, to soil sample carry out supporting；
Water pressure control system, including oil pump, water tank, solenoid valve and permeable stone are pressurizeed to water tank by oil pump and are lifted sink
Height of water level, and water injected into layer of sand from water tank to realize simulation layer of sand containing artesian water；
Data collection system, including pore water pressure sensor, laser displacement gauge and CPT test to obtain the strong of the soil body by CPT
Spend index；The laser displacement gauge measures surface displacement data；
Camera system, including LED illumination lamp, the external high-definition digital camera of model casing, the high-definition camera built in model casing；Institute
The label and PIV image technique of stating camera system combination PIV powder obtain the data of soil displacement field；
It controls hydraulic pressure and centrifugal acceleration induces the unstability of diaphram wall support system, soil sample is recorded by data collection system
The test data of surface displacement, cell wall deformation and layer of sand pore water pressure distribution situation, high-definition camera and high-definition digital
Underground continuous wall groove segment deformation and groove instability destroy special during the analysis test of camera combination PIV image processing techniques
Sign, and then evaluate the stability of its grooving.
The model casing is made of four blocks of side plates and one piece of bottom plate and top plate, and wherein removable side panel passes through bolt and model
Box main body connection, can be removed in preparation of soil sample process, flatten convenient for embedded data sampling sensor and to soil sample.
One organic glass observation window is embedded in the side plate of consolidation model box main body front, is clapped for external high-definition digital camera
According to using, cooperation PIV image technique obtains the information such as soil displacement field.The pore water pressure sensor is placed in back side panel
In reserved slot, when measuring layer of sand Pore Pressure data compared to being directly embedded in the soil body, reduce to layer of sand
Disturbance.
The steel shoe is inserted into the card slot of mud bottom of pond portion setting to prop up soil sample in soil solidifying sample preparation
Shield, prevents from collapsing in sample making course.Steel shoe is rear in the mud injection mud pit of allotment to be extracted out to carry out subsequent examination
Test step.Setting steel shoe not only maintains soil stabilization during at sample, can also reduce liquid fluctuating in mud injection process
Influence to test result.To be further the disturbance reduced in steel shoe withdrawal process to the soil body, steel shoe surface is carried out
Polishing treatment simultaneously smears lubricant reduction frictional resistance in steel shoe and soil contact face.
Oil pump in the water pressure control system is adjusted by tele-control system, and then controls the hydraulic pressure in water tank, and
The height of water level being lifted in sink by opening solenoid valve, and target layer of sand is injected water by permeable stone.
The present invention evaluates the stability of the continuous wall trench underground of the layer of sand containing artesian water by centrifugal model test device,
Include the following steps:
(1) it detects and determines that each component connection of model casing is normal and it is intact to seal, and steel shoe is inserted into the setting of mud bottom of pond portion
It is fixed in card slot；
(2) the layering soil sample simulated needed for preparing: carrying out consolidation to the lower part clay sample of simulation first and will be in model casing
Portion's water level is raised to concordant with clay sample upper surface, after the completion of consolidating, is shaked out soil sample using the preparation of sand rain method, wherein sand
The relative density and void ratio of soil are controlled by the height to fall in sand rain method, by the water level in experimental rig adjust to
Sand sample is concordant；Prepare the clay sample on sand sample top again, and further by water level in experimental rig adjust to
Top clay sample is concordant, in a saturated state to ensure to simulate soil sample；
(3) mud prepared is injected to the steel shoe in mud pit and slowly extracting supporting out；
(4) it is again turned on centrifuge, accelerates to setting centrifugal acceleration, and after centrifugal acceleration is stablized, passes through oil pump pair
Water tank is forced into diaphram wall unstability；
(5) soil sample surface displacement, cell wall deformation and layer of sand pore water are recorded by data collection system during test
The test datas such as pressure distribution situation during the test carry out sample by organic glass observation window with high-definition digital camera
Part is taken pictures, and the development of diaphram wall groove instability destructive process is analyzed by PIV image processing techniques.
Superior effect of the invention is: having advantage easy to operate, vdiverse in function, simulation precision is high.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is front view of the invention；
Fig. 2 cuts open elevation for of the invention；
Fig. 3 is top view of the invention；
Figure label explanation:
1- model casing；2- organic glass observation window；
3- pore water pressure sensor；4- steel shoe；
5- mud pit；6- oil pump；
7- water tank；8- leads wall；
9- sink；10- permeable stone；
11- laser displacement gauge；12-PIV powder；
13-CPT；The matched potentiometer of 14-CPT；
15-LED headlamp；16- high-definition camera；
17- is layered soil sample.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing.
Fig. 1 shows the front view of the embodiment of the present invention, and Fig. 2 shows the elevation that cuts open of the embodiment of the present invention, Fig. 3 is shown
The top view of the embodiment of the present invention.As shown in Figure 1-Figure 3, the present invention provides a kind of evaluation layer of sand containing artesian water underground is continuous
Wall grooving Centrifugal Model Test for Stability device, including
Model casing 1, including removable side panel, front side board embed organic glass observation window 2, and back side panel is equipped with embedded pore water
The slot hole of pressure sensor 3, steel shoe 4 is inserted into mud pit 5 in soil body sample preparation and reserves in card slot, to prop up soil sample
Shield；
Water pressure control system, including oil pump 6, water tank 7, solenoid valve and permeable stone 10 are pressurizeed to water tank 7 by oil pump 6 and are lifted
The height of water level of sink 9 is risen, and water is injected into layer of sand from water tank 7 to realize simulation layer of sand containing artesian water；
Data collection system, including oil cylinder, pore water pressure sensor 3, laser displacement gauge 11 and the matched current potential of CPT13, CPT
Meter 14, tests to obtain the intensity index of the soil body by CP13T；The laser displacement gauge 11 measures surface displacement data；
Camera system, including LED illumination lamp 15, the external high-definition digital camera of model casing carry out part to sample and take pictures, model
High-definition camera 16 built in case, convenient for observation closed test phenomenon；The label and PIV of the camera system combination PIV powder 12
The data of image technique acquisition soil displacement field；Shooting quality is effectively ensured in LED illumination lamp 15.
It controls hydraulic pressure and centrifugal acceleration induces the unstability of diaphram wall support system, recorded by data collection system
The test data of soil sample surface displacement, cell wall deformation and layer of sand pore water pressure distribution situation, high-definition camera 16 and height
Underground continuous wall groove segment deformation and groove instability are broken during clear digital camera combination PIV image processing techniques analysis test
Bad feature, and then evaluate the stability of its grooving.
The model casing 1 is made of four blocks of side plates and one piece of bottom plate and top plate, and wherein removable side panel passes through bolt and mould
The connection of molding box main body, can be removed in preparation of soil sample process, flatten convenient for embedded data sampling sensor and to soil sample.This
In inventive embodiments, the size of model casing is the mm × 700 of 900 mm × 700 mm (length × width × height), removable side panel, bottom
Plate and top plate with a thickness of 60 mm, steel shoe is with a thickness of 30 mm.
The organic glass observation window 2 is embedded in the side plate of 1 front of consolidation model case, is clapped for external high-definition digital camera
According to using, cooperation PIV image technique obtains the information such as soil displacement field.The pore water pressure sensor 3 is placed in rear side
In the reserved slot of plate, when measuring layer of sand Pore Pressure data compared to being directly embedded in the soil body, reduce to sand
The disturbance of layer.
The steel shoe 4 is inserted into the card slot of 5 bottom of mud pit setting to prop up soil sample in soil solidifying sample preparation
Shield, prevents from collapsing in sample making course.The rear extraction in the mud injection mud pit 5 of allotment of steel shoe 4 is subsequent to carry out
Test procedure.Setting steel shoe 4 not only maintains soil stabilization during at sample, can also reduce liquid surface wave in mud injection process
The dynamic influence to test result.To be further the disturbance reduced in 4 withdrawal process of steel shoe to the soil body, to 4 surface of steel shoe
It is processed by shot blasting and smears lubricant reduction frictional resistance in steel shoe 4 and soil contact face.
Oil pump 6 in the water pressure control system is adjusted by tele-control system, and then controls the hydraulic pressure in water tank 7,
And the height of water level being lifted in sink 9 by opening solenoid valve, and target layer of sand is injected water by permeable stone 10.
The present invention evaluates the stability of the continuous wall trench underground of the layer of sand containing artesian water by centrifugal model test device,
Include the following steps:
(1) it detects and determines that the connection of each component of model casing 1 is normal and it is intact to seal, and steel shoe 4 is inserted into the setting of 5 bottom of mud pit
Card slot in be fixed；
(2) the layering soil sample 17 simulated needed for preparing: consolidation is carried out to the lower part clay sample of simulation first and by model casing
Water level inside is raised to concordant with clay sample upper surface, after the completion of consolidating, is shaked out soil sample using the preparation of sand rain method, wherein
The relative density and void ratio of sand are controlled by the height to fall in sand rain method, by the water level in experimental rig adjust to
It is concordant with sand sample；Prepare the clay sample on sand sample top again, and further by water level in experimental rig adjust to
It is concordant with top clay sample, it is in a saturated state to ensure to simulate soil sample；
(3) mud prepared is injected to the steel shoe in mud pit 5 and slowly extracting supporting out；
(4) it is again turned on centrifuge, accelerates to setting centrifugal acceleration, and after centrifugal acceleration is stablized, passes through oil pump pair
Water tank is forced into diaphram wall unstability；
(5) soil sample surface displacement, cell wall deformation and layer of sand pore water are recorded by data collection system during test
The test datas such as pressure distribution situation, during the test with high-definition digital camera by organic glass observation window 2 to sample into
Row part is taken pictures, and the development of diaphram wall groove instability destructive process is analyzed by PIV image processing techniques.
The foregoing is merely preferred embodiments of the invention, are not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of the present invention within.
Claims (2)
1. a kind of evaluation layer of sand containing artesian water continuous wall trench underground Centrifugal Model Test for Stability device, it is characterised in that: packet
It includes
Model casing, including removable side panel, front side board embed observation window, and back side panel is equipped with embedded pore water pressure sensor
Slot hole, steel shoe be inserted into the soil body sample preparation mud pit reserve card slot in, to soil sample carry out supporting；
Water pressure control system, including oil pump, water tank, solenoid valve and permeable stone are pressurizeed to water tank by oil pump and are lifted sink
Height of water level, and water injected into layer of sand from water tank to realize simulation layer of sand containing artesian water；
Data collection system, including pore water pressure sensor, laser displacement gauge and CPT test to obtain the strong of the soil body by CPT
Spend index；The laser displacement gauge measures surface displacement data；
Camera system, including LED illumination lamp, the external high-definition digital camera of model casing, the high-definition camera built in model casing；Institute
The label and PIV image technique of stating camera system combination PIV powder obtain the data of soil displacement field；
It controls hydraulic pressure and centrifugal acceleration induces the unstability of diaphram wall support system, soil sample is recorded by data collection system
The test data of surface displacement, cell wall deformation and layer of sand pore water pressure distribution situation, high-definition camera and high-definition digital
Underground continuous wall groove segment deformation and groove instability destroy special during the analysis test of camera combination PIV image processing techniques
Sign, and then evaluate the stability of its grooving.
2. the evaluation continuous wall trench underground Centrifugal Model Test for Stability of layer of sand containing artesian water dress according to claim 1
It sets, it is characterised in that: the oil pump in the water pressure control system is adjusted by tele-control system, and then controls the water in water tank
Pressure, and the height of water level being lifted in sink by opening solenoid valve, and target layer of sand is injected water by permeable stone.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110243413A (en) * | 2019-06-27 | 2019-09-17 | 浙江大学 | A kind of monitoring device and monitoring method of hypergravity centrifugal model physical state |
| CN112229736A (en) * | 2020-12-14 | 2021-01-15 | 西南交通大学 | Wheel-rail force calibration device, method and system |
| CN112816660A (en) * | 2021-01-14 | 2021-05-18 | 浙江大学 | Centrifugal model test device and method for researching underground continuous wall construction environmental effect |
| CN113049773A (en) * | 2021-02-07 | 2021-06-29 | 浙江大学 | Centrifugal model test device for simulating ground collapse induced by damaged non-pressure pipeline |
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| US20100108392A1 (en) * | 2008-10-22 | 2010-05-06 | Ressi Di Cervia Arturo L | Method and apparatus for constructing deep vertical boreholes and underground cut-off walls |
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