CN106769772A - The device and its monitoring method of real-time monitoring dry ground consolidation process - Google Patents
The device and its monitoring method of real-time monitoring dry ground consolidation process Download PDFInfo
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- CN106769772A CN106769772A CN201710020234.6A CN201710020234A CN106769772A CN 106769772 A CN106769772 A CN 106769772A CN 201710020234 A CN201710020234 A CN 201710020234A CN 106769772 A CN106769772 A CN 106769772A
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- 238000007596 consolidation process Methods 0.000 title claims abstract description 22
- 238000012544 monitoring process Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002689 soil Substances 0.000 claims abstract description 53
- 238000007906 compression Methods 0.000 claims abstract description 23
- 230000006835 compression Effects 0.000 claims abstract description 23
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 13
- 239000003921 oil Substances 0.000 claims abstract description 8
- 210000005239 tubule Anatomy 0.000 claims abstract 4
- 239000007789 gas Substances 0.000 claims description 49
- 239000011261 inert gas Substances 0.000 claims description 5
- 230000008602 contraction Effects 0.000 claims description 3
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 2
- 229920006255 plastic film Polymers 0.000 claims description 2
- 230000002459 sustained effect Effects 0.000 claims description 2
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 229910052786 argon Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229940099259 vaseline Drugs 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Remote Sensing (AREA)
- Geology (AREA)
- Dispersion Chemistry (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 discloses the device and its monitoring method of real-time monitoring dry ground consolidation process, wherein, arrangement of cavities fills hydraulic oil in top land in the cavity of upper piston area；Oil pressure pump is rigidly connected with cavity；In piston（8）In be built-in with pipeline, gas flowmeter is set on pipeline（7）, valve（5）；Tubule is set in the base of stress room, tubule is connected to inertia gas cylinder, and tubule is provided with valve（3）And valve（4）, valve（3）And valve（4）Between be disposed with gas flowmeter（2）, gas flowmeter（2）And gas flowmeter（7）With data collecting system（13）It is connected, soil sample is placed between base and piston.Monitoring method is：The continuous P that is further applied load at the top of soil sample, the change according to soil sample top and bottom gas obtains the porosity e in dry soil samples consolidation process, draws e P curves, obtains compression curve and the compressed coefficient.Result is accurate, easy to detect.
Description
Technical field
The present invention relates to the real-time monitoring of dry ground consolidation process, more particularly to a kind of automatic real-time testing dry ground was consolidated
Monitoring device and its monitoring method in journey.
Background technology
Under external force, the phenomenon of engineering soil soil body volume-diminished is referred to as compression.The cubic deformation caused by direct stress,
Increase because external load causes direct stress in ground so that soil body volume-diminished, under additional stress effect, foundation soil will be produced
Raw volume-diminished, so as to cause the displacement of the vertical direction on building basis.Excessive sedimentation, particularly differential settlement, meeting
Make building run-off the straight, cracking so that can not normally use.Therefore, sedimentation of the foundation soil under load action is researched and analysed special
Property is very important.Under outer load action, air is gradually extruded foundation soil, mutually compacted between soil skeleton particle, soil
Hole reduce, so as to cause soil compression.Typically in geotechnical testament, by determining compression of the soil in consolidation process
Curve come study soil settling character.At present, the compression curve in native consolidation process is mainly using manually implemented hierarchical loading
And manually read porosity method come complete test.Hole when the method needs repeatedly manually read and determine to stablize
Porosity, can just carry out the loading of next stage.There is Railway Project in this method:(1) place counterweight to realize classification using artificial
The load mode of loading is more extensive, and systematic error is larger；(2) load of discontinuous change can only be applied by specification, is finally painted
The compression curve made is the curve obtained by fitting by a small amount of more discrete data point, not enough accurately；(3) every grade
It is required for manually reading decrement after pressure applying, the artificial mode for reading data can simultaneously cause systematic error and accidentally miss
Difference, the porosity obtained so as to cause to convert is inaccurate；(4) must several times, separated in time read test data, every grade plus
Need to consolidate displacement variable when could for a long time obtain stabilization after load, data monitoring is wasted time and energy.
The Chinese invention patent of Application No. 201110030140.X, discloses a kind of new unsaturated soil high pressure consolidation
Experimental rig, the instrument is only applicable to the coefficient of consolidation and compression of the various soil properties that are run into civil engineering under unsaturated state
The measurement of rule, but it is substantial amounts of in the device used sensor, cause its cost high, and wherein complex operation, adopt
Collection data are more, are not easy to actual engineering and promote.
The Chinese invention patent of Application No. 201620077360.6, discloses a kind of double lever consolidometer, should
Instrument has carried out technical optimization on the basis of traditional soil consolidation test instrument, and only increasing prevents soil test block from collapsing
It is bad to be scattered, measure accurately function, and substantially or manually load, workload is big, it is impossible to fundamentally reduce by a large amount of
The error that the artificial operation of repeatability is brought.
The content of the invention
In order to overcome the deficiencies in the prior art, it is an object of the invention to provide a kind of dress of real-time monitoring dry ground consolidation process
Put and its monitoring method.
A kind of device of real-time monitoring dry ground consolidation process, including oil pressure pump, stress room, piston, wherein, arrangement of cavities exists
On piston, hydraulic oil is filled in the cavity of upper piston area；Oil pressure pump is rigidly connected with cavity；Pipeline is built-in with piston,
Gas flowmeter and valve are set on pipeline；
Stress room is a closed structure, is surrounded by the baffle plate of surrounding, base and top cover, and pipeline, pipeline are set in base
Inertia gas cylinder is connected to, pipeline is provided with two valves, and gas flowmeter, two gas flowmeters are disposed between two valves
It is connected with data collecting system；
Soil sample is placed between the base of stress room and piston.
The section of cavity is T-shaped；Piston is straight rod member, and section is decussate texture.
The porosity of soil sample can be derived by by testing the reading of gas flowmeter by data collecting system, entered
And obtain compression curve.
The method of real-time monitoring dry ground consolidation process, step is as follows：
(1) soil sample is fabricated to bar shape, and uses plastic film wrapped, it is standby；
(2), soil sample is placed on the base of stress room, soil sample top contact piston base, by stress room altogether；
(3), it is further applied load P to the hydraulic oil in cavity using compression pump, hydraulic oil is pressurized and down promotes piston, soil sample
By the pressure contractions of piston, the load that soil sample is subject to is P；
(4), treat that load applies to finish, close two valves of base and inertia gas cylinder connecting pipe, now top land
Valve stay open or closed mode, inflated in base and inertia gas cylinder connecting pipe, open close to inertia gas cylinder
Valve, makes between two valves on inert gas filling base and inertia gas cylinder connecting pipe, shuts close to inertia gas cylinder
Valve, the reading P1 of the gas flowmeter between two valves is gathered using data collecting system；It is to be collected finish after, keep live
Valve-closed state at the top of plug, opens the valve close to base on base and inertia gas cylinder connecting pipe, then inert gas from
Valve close to inertia gas cylinder and top land are gradually flowed between two valves on base and inertia gas cylinder connecting pipe
Between valve, treat that inert gas concentration in whole pipeline is consistent, after the stable reading of gas flowmeter, using data acquisition system
The reading P2 of the gas flowmeter of system collection top land, obtains formula (2), and then obtain the hole under this load according to formula (1)
Degree e：
P1×VA=P2 × (VA+VB+VN) formula (1)
VN=P1 × VA-P2×(VA+VB) formula (2)
Wherein VAIt is the volume between two valves on base and inertia gas cylinder connecting pipe；VBIt is base and indifferent gas
The conduit volume between valve and top land valve on bottle connecting pipe close to base；VA、VBCan be by bohr law conservation
Determine, wherein VBVolume not comprising sample, the simply volume of pipeline；
E=VN/ V formulas (3)
V:Soil sample cumulative volume；VN：Voidage.
(5) compression load that load is applied to soil sample, is gradually increased, repeat step (4) is obtained under a series of loads
Porosity；With load as abscissa, porosity is ordinate, is drawn, and obtains the compression curve of the soil sample, is obtained according to compression curve
To the compressed coefficient.
Beneficial effects of the present invention：
(1) present invention is further applied load by compression pump, and the difference of adjacent load is small, can continuously acquire the hole of steady load
Degree, result precision is improved；
(2) simple to operate, without the artificial decrement read in native consolidation process, directly conversion obtains a series of porositys
Value, and the compression curve of the soil sample is drawn out, so as to obtain the compressed coefficient；
(3) error that this method overcomes the discontinuity of artificial loading, artificial reading data are brought, it is accurate to improve
Degree.
Brief description of the drawings
Fig. 1 is the structural representation of the device of real-time monitoring dry ground consolidation process of the present invention；
Fig. 2 is the gained compression curve of the embodiment of the present invention 1.
The mark of each several part is as follows in accompanying drawing：1：Inertia gas cylinder；2、7：Gas flowmeter；3、4、5：Valve；6：Flexible pipe；8：
Piston；9：Cavity；10：Oil pressure pump；11：Base；12:Stress room；13：Data collecting system.
Specific embodiment
Presently preferred embodiments of the present invention is described in detail below in conjunction with the accompanying drawings so that it is of the invention a little with feature energy
Enough it is easier to be readily appreciated by one skilled in the art, apparent is clearly defined so as to be made to protection scope of the present invention.
Reference picture 1, a kind of device of real-time monitoring dry ground consolidation process, wherein, oil pressure pump 10 is rigidly connected with cavity 9,
The piston 8 that can slide up and down is set in cavity 9, and piston is straight rod member, and section is decussate texture, in the cavity of upper piston area
9 filling hydraulic oil, oil pressure pump 10 applies pressure to cavity 9, then the hydraulic oil in cavity 9 is pressurized, and moves down piston 8, right
The soil sample of piston base applies pressure；In order to amplify hydraulic effect, the section of cavity 9 is T-shaped.It is built-in with piston 8 and is passed through
Logical pipeline, with the soft connection of flexible pipe 6.Gas flowmeter 7, valve 5 are set on flexible pipe 6, and flexible pipe 6 has good airtight
Property, can bear compared with atmospheric pressure without gas leakage.
Stress room 12 is a closed structure, is surrounded by the baffle plate of surrounding, base and top cover, in cuboid, is used for
Shielding soil body sample is subject to ectocine, and soil sample is placed on the base 11 of stress room during detection, and soil sample top is pressed by piston 8
Tightly, pipeline is set in base 11, pipeline is connected to inertia gas cylinder 1, and pipeline is provided with valve 3 and valve 4, between valve 3 and valve 4
A gas flowmeter 2 is disposed with, gas flowmeter 2 and gas flowmeter 7 are connected with data collecting system 13.
Particular moment can be derived by by data collecting system 13 by testing the pressure reading of gas flowmeter 2,7
Soil sample porosity, and then obtain compression curve.
Embodiment 1：
The soil sample that the present embodiment is used is collection from Nanjing Yuhuatai District Deep Foundation Pit soil, and soil sample is made into size
φ × h is 50mm × 100mm, and density is 1.8g/cm3Cylinder, then wrap up soil sample with the good plastic sheath of air-tightness.
(1), by using bohr law conservation, to the conduit volume V between valve 3 and valve 4A, valve 4 and valve 5
Between flexible pipe volume VBIt is measured, wherein VBThe not no volume comprising sample, the simply volume of pipeline；
(2), soil sample is placed on the base 11 of stress room 12, vaseline is smeared in base wall, stress room is closed
Come；
(3), it is further applied load P=1kpa to the hydraulic oil in cavity 9 using compression pump 10, hydraulic oil is pressurized piston down
Promote, soil sample is subject to the pressure contractions of piston, and the load that soil sample is subject to is also P=1kpa；Period constantly injects in cavity 9
Hydraulic oil, so that sustained loading is constant；
(4), treat that load applies to finish, valve 3, valve 4 (now valve 5 is open mode) are shut, using inertia gas cylinder
Indifferent gas (argon gas is used in the present embodiment) is filled to pipeline, valve 3 is slowly opened, argon gas slowly flows into valve 3 from valve 3
And the pipeline between valve 4, observe gas flowmeter 2 reading P1 reach 100bar (this reading combination gas flowmeter
Max-thresholds determine, it is too small if change unobvious) after shut valve 3, using data collecting system collection gas flowmeter 2
Reading P1；It is to be collected finish after, shut valve 5, open valve 4, then pipeline of the argon gas between valve 3 and valve 4 gradually flows
Enter between valve 4 and valve 5, treat that argon concentration is basically identical, the stable reading of gas flowmeter 2,7 and after reaching unanimity, profit
The reading P2 of gas flowmeter 2 or gas flowmeter 7 is gathered with data collecting system, and is changed by bohr law, according to formula
(1) formula (2) is obtained, and then obtains the porosity e under this load0：
P1×VA=P2 × (VA+VB+VN) formula (1)
VN=P1 × VA-P2×(VA+VB) formula (2)
Wherein VAIt is the conduit volume between valve 3 and valve 4；VBIt is the flexible pipe volume between valve 4 and valve 5；
e0=VN/ V formulas (3)
V:Soil sample cumulative volume；VN：Voidage.
(6), gradually increase load be applied to soil sample compression load (P1 ... P5=20kpa, 50kpa, 100kpa,
200kpa, 400kpa), repeat step (4) obtains a series of porosity (e1 ... e5) under loads；It is horizontal seat with load
Mark, porosity is ordinate, is drawn, and the compression curve of the soil sample is obtained, as shown in figure 3, obtaining the compressed coefficient=0.35.
Embodiments of the invention are the foregoing is only, the scope of the claims of the invention is not thereby limited, it is every to utilize this hair
Bright specification and accompanying drawing content make equivalent structure or equivalent flow conversion, or are directly or indirectly used in other related skills
Art field, is included within the scope of the present invention.
Claims (5)
1. a kind of device of real-time monitoring dry ground consolidation process, it is characterised in that including oil pressure pump, stress room, piston, wherein,
Arrangement of cavities fills hydraulic oil in upper piston area in the cavity of upper piston area；Oil pressure pump is rigidly connected with cavity；In piston (8)
In be built-in with pipeline, on pipeline set gas flowmeter (7), valve (5)；
Pipeline is set in the base of stress room, pipeline is connected to inertia gas cylinder, and pipeline is provided with valve (3) and valve (4), valve
(3) gas flowmeter (2), gas flowmeter (2) and gas flowmeter (7) and data acquisition system are disposed with and valve (4) between
System (13) is connected；
Soil sample is placed between base and piston.
2. the device of real-time monitoring dry ground consolidation process according to claim 1, it is characterised in that the section of the cavity
It is T-shaped；Piston is straight rod member, and section is decussate texture.
3. the device of real-time monitoring dry ground consolidation process according to claim 1, it is characterised in that the stress room be by
The closing space that the baffle plate of surrounding, base and top cover are surrounded.
4. the side of the real-time monitoring dry ground consolidation process of the device based on the real-time monitoring dry ground consolidation process described in claim 1
Method, it is characterised in that step is as follows：
(1) soil sample is fabricated to cylinder, and uses plastic film wrapped, it is standby；
(2), cylinder soil sample is placed on the base of stress room, soil sample top contact piston base, by stress room altogether；
(3), it is further applied load P to the hydraulic oil in cavity (9) using compression pump (10), hydraulic oil is pressurized and down promotes piston,
Soil sample is subject to piston to transmit downward load P contractions；
(4), treat that load applies to finish, shut valve (3), valve (4), valve (5) is on or off state, opens indifferent gas
Bottle fills indifferent gas to pipeline, opens valve (3), and inert gas flows into the pipeline between valve (3) and valve (4) from valve (3)；
Then valve (3) is shut, using the reading P1 of data collecting system (13) collection gas flowmeter (2)；After collection is finished, shut
Valve (5), opens valve (4), then pipeline of the indifferent gas between valve (3) and valve (4) flows into valve (3) and valve (5)
Between, treat that inert gas is consistent in the concentration of pipeline, after the stable reading of gas flowmeter (2,7), using data collecting system
The reading P2 of collection gas flowmeter (2,7), formula (2) is obtained according to formula (1), and convolution (3) obtains the porosity under this load
e：
P1×VA=P2 × (VA+VB+VN) formula (1)
VN=P1 × VA-P2×(VA+VB) formula (2)
Wherein VAIt is the tubule volume between valve (3) and valve (4)；VBIt is the flexible pipe volume between valve (4) and valve (5)；
E=VN/ V formulas (3)
V:Soil sample cumulative volume；VN：Voidage.
(5) compression load that load is applied to soil sample, is gradually increased, repeat step (4) obtains a series of hole under loads
Degree；With load as abscissa, porosity is ordinate, is drawn, and obtains the compression curve of the soil sample, is pressed according to compression curve
Contracting coefficient.
5. the method for real-time monitoring dry ground consolidation process according to claim 4, it is characterised in that step (3) is further applied load
Period, sustained loading was constant constantly to hydraulic oil is injected in cavity.
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| CN201710020234.6A CN106769772A (en) | 2017-01-11 | 2017-01-11 | The device and its monitoring method of real-time monitoring dry ground consolidation process |
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| CN201710020234.6A CN106769772A (en) | 2017-01-11 | 2017-01-11 | The device and its monitoring method of real-time monitoring dry ground consolidation process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109100284A (en) * | 2018-10-24 | 2018-12-28 | 辽宁工程技术大学 | A kind of device and method that can be measured CHARACTERISTICS OF TAILINGS SAND and consolidate permeability parameters in real time |
| CN110044713A (en) * | 2019-04-22 | 2019-07-23 | 河海大学 | A kind of the piston vapour-pressure type consolidation testing device and method of grouting behind shaft or drift lining slurries |
| CN111610131A (en) * | 2020-06-01 | 2020-09-01 | 浙江大学 | Soil porosity nondestructive testing device and method thereof |
| CN115126009A (en) * | 2022-06-10 | 2022-09-30 | 河海大学 | Device for reducing relative compactness of saturated sandy soil field and construction method |
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| CN109100284A (en) * | 2018-10-24 | 2018-12-28 | 辽宁工程技术大学 | A kind of device and method that can be measured CHARACTERISTICS OF TAILINGS SAND and consolidate permeability parameters in real time |
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| CN111610131A (en) * | 2020-06-01 | 2020-09-01 | 浙江大学 | Soil porosity nondestructive testing device and method thereof |
| CN111610131B (en) * | 2020-06-01 | 2021-04-13 | 浙江大学 | Soil porosity nondestructive testing device and method thereof |
| CN115126009A (en) * | 2022-06-10 | 2022-09-30 | 河海大学 | Device for reducing relative compactness of saturated sandy soil field and construction method |
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Application publication date: 20170531 |