CN105735376B - Consider the drain bar water-flowing amount test equipment and its method of testing of plate soil interaction - Google Patents
Consider the drain bar water-flowing amount test equipment and its method of testing of plate soil interaction Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 100
- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 238000010998 test method Methods 0.000 title claims abstract description 19
- 230000003993 interaction Effects 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 117
- 239000004816 latex Substances 0.000 claims abstract description 50
- 229920000126 latex Polymers 0.000 claims abstract description 50
- 230000005540 biological transmission Effects 0.000 claims abstract 2
- 238000007789 sealing Methods 0.000 claims description 25
- 238000005259 measurement Methods 0.000 claims description 24
- 238000004513 sizing Methods 0.000 claims description 19
- 229920001971 elastomer Polymers 0.000 claims description 15
- 238000007596 consolidation process Methods 0.000 claims description 9
- 239000000284 extract Substances 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 239000000839 emulsion Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 18
- 238000005516 engineering process Methods 0.000 description 13
- 239000004033 plastic Substances 0.000 description 4
- 239000004576 sand Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012913 prioritisation Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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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
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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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
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
Consider the drain bar water-flowing amount test equipment and its method of testing of plate soil interaction, the plate soil unit for being surrounded by latex film is arranged in balancing gate pit, balancing gate pit top water flowing outlet water receiving measurer；Bottom water flowing entrance connects determines head water inlet；Balancing gate pit top, bottom pick out water end (W.E.) pressure-measuring pipe and water inlet end pressure-measuring pipe respectively；Efferent duct under efferent duct and lateral pressure, is characterized in that the soil body is provided between latex film and drain bar in the external lateral pressure in balancing gate pit, and the soil body is mud；Test pressure is directly acted on latex film by balancing gate pit, then is acted on drain bar by soil body transmission.Instant invention overcomes the drawbacks of prior art, test result is set more to meet engineering practice.Workable, achievable automatic test, test result provides reliable basic data for the type selecting of drain bar in draining concretion method soft soil foundation engineering, and unification selects the general layout of drain bar model according to plate depth in having broken existing draining concretion method design work.
Description
Technical field
The invention belongs to Geotechnical Engineering Soft Soil Subgrade Treatment Techniques field, and in particular to a kind of new measurement drain bar is indulged
To the equipment and complete set technology of water-flowing amount, plate soil phase is not accounted in the existing conventional drainage plate longitudinal flowing water measuring measuring technology of improvement
The technological deficiencies such as interaction, can indoors pass through vacuum preloading model test, piling prepressing model test or directly charge silt
The method of mud makes plate soil unit, by the longitudinal flowing water measuring of test board soil unit, reaches consideration plate soil interaction
In the case of test the purpose of drain bar longitudinal flowing water measuring, the technology solves existing drain bar longitudinal flowing water measuring method of testing not to be had
There are consideration plate soil interaction, test result to be difficult to accurately reflect the key technical problems such as the actual water flowing characteristic of drain bar, be
The type selecting of plastic draining board provides the reliable firsthand information in draining concretion method soft soil foundation.
Background technology
As China's reform and opening-up is constantly to depth propulsion and the fast development of modernization construction, the contradiction having a large population and a few land day
Benefit is prominent, and the natural excellent ground that can directly utilize is fewer and feweri, reclaims fields from the sea and has formed a kind of new normality.The weakness of new hydraulic reclamation
The features such as clay ground has big water content high, bad hydraulic permeability, compressibility, low intensity, foundation bearing capacity and stability cannot expire
Sufficient engineering use requirement is, it is necessary to take measures of foundation treatment to carry out consolidation process.
Draining concretion method is most economical practical soft base processing method, be reinforcing soft soil foundation most effectual way it
One.Draining concretion method is mainly made up of drainage system and compression system, and drainage system is divided into horizontal drainage system and vertical row again
Two parts of water system, horizontal drainage system is typically all to be undertaken by certain thickness medium coarse sand bed course, chimney drain
Including sand drain, sand wick and plastic draining board, the wherein most widely used of plastic draining board.
The principle of draining concretion method is exactly to be classified to apply a certain amount of load on the soft soil foundation for laid drainage system,
Excess pore water pressure is produced in soft soil foundation, as the Free water in soft soil foundation is discharged, excess pore pressure dissipation,
Ground effective stress is increased, so as to reach the purpose of reinforcing soft ground.The reliability of drainage system is directly connected to row
The success or failure of water concretion method.Plastic draining board as drainage system one of important component, its water flowing characteristic is solid as draining
The focal issue of connection success or failure, therefore, the water flowing characteristic of accurate test drain bar is most important.
Conventional drainage plate water flowing characteristic test method (geosynthetics test procedure SL235-2012) is directly will bag
The drain bar for having latex film loads in water-flowing amount test pressure room, and confined pressure is applied to balancing gate pit, adjusts the water level of water inlet pipe and water outlet pipe, with
Water flowing afterwards is tested.This method of testing can not effectively reflect the actual water flowing characteristic of drain bar, as drain bar is sent out in engineering
The larger vertical deformation of life is simultaneously influenceed by soil body lateral stress, and its water flowing characteristic is varied widely.For example, new reclaiming fields from the sea
In blowing-filling sludge foundation treatment engineering, the drain bar water passing capacity tested using conventional method meets requirement, but project treatment is imitated
Fruit does not reach requirement.Above mentioned problem is not because conventional water flowing weight testing method of the prior art accounts for plate soil phase interaction
With.
The content of the invention
It is and this it is an object of the invention to provide a kind of drain bar water-flowing amount test equipment for considering plate soil interaction
The setting of equipment, application method.The present invention need solve key problem in technology be：Improve existing drain bar longitudinal flowing water measuring test
Technological deficiency, there is provided a kind of equipment and technical scheme of new test drain bar longitudinal flowing water measuring.The equipment is by balancing gate pit, row
Water plate water passage system, lateral pressure applying and its control system, drain bar water flowing head control system, drain bar water flowing are supplied and logical
Measure of water system etc. is constituted.
Completing the technical scheme of foregoing invention task is, a kind of drain bar water-flowing amount test for considering plate soil interaction sets
Standby, the plate soil unit (sample) for being surrounded by latex film is arranged in water-flowing amount test pressure room, water-flowing amount test pressure room top
Water flowing outlet, water receiving measurer；The water flowing entrance of water-flowing amount test pressure room bottom, connects and determines head water inlet；Meanwhile, water flowing
Amount test pressure room top, water-flowing amount test pressure room bottom pick out water end (W.E.) pressure-measuring pipe and water inlet end pressure-measuring pipe respectively；Balancing gate pit
Efferent duct under efferent duct and lateral pressure in external lateral pressure, it is characterised in that described plate soil unit is in latex film and row
The soil body is provided between water plate, the soil body is mud；Described test pressure is directly acted on latex film by balancing gate pit, then
Transmitted by the soil body (mud) and acted on drain bar.
That is, described sample-" the plate soil unit " in the present invention program is different from sample of the prior art, existing
Sample in technology is drain bar；And sample of the invention is the combination of drain bar and the soil body.
This drain bar of the invention has two kinds of preparation methods with the sample of the combination of the soil body：One is in the latex
Mud is directly charged between film and drain bar；The second is being made using vacuum preloading or piling prepressing model test.With reference to after
Literary " method of testing " part.
The further improvement of above technical scheme, there is following prioritization scheme：
1st, described " being surrounded by the drain bar of latex film to be arranged in water-flowing amount test pressure room ", specific set-up mode is：
Base core groove is provided with water-flowing amount test pressure room bottom, of the plate soil unit (sample) for being surrounded by latex film to be measured inserts
Enter the base core groove, clamp-on the gap between drain bar and core groove with rubber ring and cover cover plate, make drain bar flexible with core groove
Sealing；
2nd, the set-up mode of latex film of the bag outside drain bar is：Water-flowing amount test pressure room bottom is provided with plate soil unit
Body base；Latex film lower end is fixed on the plate soil unit base, and is tightened with latex elastic tape；
The 3rd, plate soil unit sizing cylinder is installed outside latex film；
4th, latex film upper end is turned over be enclosed within the sizing cylinder it is suitable for reading；
5th, when using sludge process making plate soil unit is directly charged, it is being surrounded by outside the drain bar of latex film on set
Protective case, too drain bar is polluted when preventing from charging mud, is charged after mud terminates, and pulls out drain bar protective case；
When plate soil unit is made using vacuum or piling prepressing model test, with rubber ring add a cover plate by drain bar with
Gap sealing between core groove.
Completing the technical scheme of second invention task of the application is, the drain bar water flowing of above-mentioned consideration plate soil interaction
Measure the method for testing of test equipment.
According to different situations with require, method of testing of the invention be divided into it is following two in the case of two kinds of different operating sides
Method：
One, directly charge mud make plate soil unit and test water-flowing amount test method：
Secondly, vacuum or piling prepressing make plate soil unit test method.
Two methods are respectively described below：
One, directly charge mud make plate soil unit and test water-flowing amount test method, it is characterised in that step is such as
Under,
(1) inserted base core groove of drain bar (sample) is clamp-oned the gap between drain bar and core groove by with rubber ring
And cover plate is covered, make drain bar and core groove flexible sealing；
(2) installs bottom discharge plate water-flowing device, connection water inlet pipe and water inlet end head measurement pipeline；
(3) clamp-ons between drain bar and core groove the drain bar inserted base core groove of plate soil unit one end with rubber ring
Gap and cover cover plate, make drain bar and core groove flexible sealing；
(4) is in the outer installing plate soil unit sizing cylinder of latex film；
Latex film upper end is turned over be enclosed within sizing cylinder it is suitable for reading；
(6) puts drain bar protective case, and too drain bar is polluted when preventing from charging mud；
(7) mud is charged in latex films of the to sizing cylinder support, drain bar is highly stepped up with mud during charging
Sheath until extract completely.Mud charge close to it is suitable for reading when install and increase cylinder, mud face is higher by sizing cylinder about 2cm suitable for reading；
(8) 18~20 hours are stood on mud plus after 2kg weights；
(9) is removed and is increased cylinder, removes superelevation mud, makes earth pillar highly be 400mm；Plate soil unit is constituted with this；
(10) guide sleeves on the set of drain bar upper end, install lid, and drain bar extracts guide sleeves after passing cover core groove, uses
Rubber ring adds a cover plate by gap sealing between drain bar and core groove；
(11) latex films upper end tightens sealing with lid latex elastic tape on plate soil unit；
(12) installs balancing gate pit and top water-flowing device, connection water side head measurement pipeline；
(13) balancing gate pits water inlet, classification plus side pressure consolidation；
(14) the full pressure of starts to survey water-flowing amount after 60 minutes.According to drain bar length adjustment test head before measurement, accord with it
Close hydraulic gradient i=0.5.
2~3 hours duplicate measurements water-flowing amounts in interval, record water flowing flow and water flowing time.Until water flowing measuring value meets 6
Hour change≤5%, last measured value is the drain bar water-flowing amount result of the test.
Drain bar water-flowing amount is calculated according to formula (1)；
Q-water-flowing amount, cm in formula3/s；
By the water of drain bar, cm in V-t time periods3；
T-pass through the time that V flows are experienced, s；
I-hydraulic gradient, is set as 0.5.
Secondly, vacuum or piling prepressing make plate soil unit test method：
(1) carries out vacuum or piling prepressing model test by predetermined compression ratio, with draining in the model cylinder for pressing in advance
Centered on plate, take out diameter and be not less than 150mm, earth pillar of the length more than 450mm；
(2) the specific purpose tool such as fret saws, diameter 150mm, length 400mm, drain bar length 450mm are rebuild into by earth pillar
The plate soil unit of (two ends respectively grow earth pillar 25mm), wraps up standby with filter cloth；
(3) clamp-ons between drain bar and core groove the drain bar inserted base core groove of plate soil unit one end with rubber ring
Gap and cover cover plate, make drain bar and core groove flexible sealing；
(4) trimmings plate soil unit, makes it in the same size with base and engages good；
(5) the filter cloth that is gone outside board falling soil unit, with holding film cylinder by emulsion film a set of on plate soil unit, lower end and bottom
Seat latex elastic tape tightens sealing；
(6) installing plates soil unit fixed cylinder, latex film upper end turned over to be enclosed within sizing cylinder suitable for reading；
(7) guide sleeves on the set of drain bar upper end, install lid, and drain bar extracts guide sleeves after passing cover core groove, uses
Rubber ring adds a cover plate by gap sealing between drain bar and core groove；
(8) latex films upper end tightens sealing with lid latex elastic tape on plate soil unit；
(9) installs balancing gate pit and top water-flowing device, connection water side head measurement pipeline；
(10) balancing gate pits water inlet, classification plus side pressure consolidation；
(11) the full pressure of surveys water-flowing amount after 60 minutes, and 2~3 hours duplicate measurements water-flowing amounts in interval are until water flowing measuring value is expired
Foot change≤5% in 6 hours；
(12) after water flowings measurements meet error requirements, adjustment head continuously measures 4~5 measuring points, covers head
Drain bar water flowing segment length is in the head scope corresponding to hydraulic gradient i=0.5；
(13) calculates drain bar water-flowing amount according to formula (1)；
(14) drain bar water flowing segment length is measured when removes plate soil unit, the head of correspondence i=0.5 is calculated, different water are used
The dependency relation of the measured water-flowing amount of head, the water-flowing amount that interpolation is calculated is the drain bar water-flowing amount result of the test.
In other words, the key property of balancing gate pit proposed by the invention includes：By sealing latex film to plate soil unit
Apply the stable confined pressure of 350kPa, while ensureing sealed reliable (airtight, watertight)；The soil body in plate soil unit is in process of the test
Middle stabilization, will not produce obvious soil particle to be lost in；Discharging consolidation can be carried out to plate soil unit, make the soil body before water-flowing amount test
Normal consolidation state is basically reached under the lateral pressure effect of stabilization；Balancing gate pit's inner panel soil unit lateral pressure change can be grasped flexibly
Control；Plate soil unit is strictly isolated with pressure medium (water, air)；While plate soil unit upper and lower side is in close contact with instrument
Keep drain bar unobstructed with instrument current；Plate soil unit is intake and water outlet two ends head is measurable and controllable.In base and upper lid point
The water inlet end of other perforate connection drain bar and water side, pressure-measuring pipe is connect with flexible pipe respectively, is surveyed and is read into and out of head.It is equal into and out of water level
Head regulation can be carried out by adjusting the mouth of a river highly；The assembling of plate soil unit is workable.
The technical scheme is that a kind of equipment and complete set technology of new test drain bar longitudinal flowing water measuring, it is special
Levy that main body is by vacuum preloading model test, piling prepressing model test or directly to charge the method for mud single to make plate soil
First body.The actual condition of drain bar is simulated by the compression ratio or direct bending drain bar of Controlling model experiment, is reached in mould
The longitudinal flowing water measuring of drain bar is tested under conditions of the actual condition of plan drain bar.Test result is set more truly to reflect
The actual water flowing characteristic of drain bar.
Novel test equipment proposed by the invention and complete set technology have the characteristics that：
(1) the drain bar longitudinal flowing water measuring novel test technology is a kind of geosynthetics water flowing characteristic direct measurement
Technology, can test the actual water flowing characteristic of drain bar under conditions of drain bar actual condition is simulated；
(2) the drain bar longitudinal flowing water measuring novel test technology is workable, and can realize automatic measurement；
(3) the drain bar longitudinal flowing water measuring novel test technology tests the vertical of drain bar by making plate soil unit
To water-flowing amount, drawback present in existing measuring technology is not only solved, test result is more truly reflected draining
The actual water flowing characteristic of plate, also for the type selecting of drain bar during draining concretion method soft soil foundation provides reliable basis
Data.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Accompanying drawing is drain bar longitudinal flowing water measuring novel test equipment structural map.In figure：
Water flowing exports 1 (water receiving measurer), picks out water end (W.E.) pressure-measuring pipe 2, meets efferent duct 3 in lateral pressure, balancing gate pit 4, row
Water plate 5, soil 6, latex film 7, water (gas) 8 connects efferent duct 9 under lateral pressure, taps into water end (W.E.) pressure-measuring pipe 10, and water flowing entrance 11 (connects fixed
Head is intake).
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing and specific implementation
Case, is described in further detail to the inventive method.It is described herein specific implementation case be only used to explain the present invention, and
It is not used in the restriction present invention.
Directly charge mud and make plate soil unit and test water-flowing amount test method：
(1) length is one inserted base core groove of drain bar sample of 450mm by, and drain bar and core groove are clamp-oned with rubber ring
Between gap and cover cover plate, make drain bar and core groove flexible sealing；
(2) installs bottom discharge plate water-flowing device, connection water inlet pipe and water inlet end head measurement pipeline；
(3) be fixed on the plate soil unit base of diameter 150mm for latex film lower end and tightened with latex elastic tape by；
(4) is in outer installing plate soil unit sizing cylinder (cylinder internal diameter 155mm) of latex film；
Latex film upper end is turned over be enclosed within sizing cylinder it is suitable for reading；
(6) puts drain bar protective case, and too drain bar is polluted when preventing from charging mud；
(7) mud is charged in latex films of the to sizing cylinder support, drain bar is highly stepped up with mud during charging
Sheath until extract completely.Mud charge close to it is suitable for reading when install and increase cylinder, mud face is higher by sizing cylinder about 2cm suitable for reading；
(8) 18~20 hours are stood on mud plus after 2kg weights；
(9) is removed and is increased cylinder, removes superelevation mud, makes earth pillar highly be 400mm；Plate soil unit is constituted with this；
(10) guide sleeves on the set of drain bar upper end, install lid, and drain bar extracts guide sleeves after passing cover core groove, uses
Rubber ring adds a cover plate by gap sealing between drain bar and core groove；
(11) latex films upper end tightens sealing with lid latex elastic tape on plate soil unit；
(12) installs balancing gate pit and top water-flowing device, connection water side head measurement pipeline；
(13) balancing gate pits water inlet, classification plus side pressure consolidation；
(14) the full pressure of starts to survey water-flowing amount after 60 minutes.According to drain bar length adjustment test head before measurement, accord with it
Close hydraulic gradient i=0.5.
2~3 hours duplicate measurements water-flowing amounts in interval, record water flowing flow and water flowing time.Until water flowing measuring value meets 6
Hour change≤5%, last measured value is the drain bar water-flowing amount result of the test.
Drain bar water-flowing amount is calculated according to formula (1)；
Q-water-flowing amount, cm in formula3/s；
By the water of drain bar, cm in V-t time periods3；
T-pass through the time that V flows are experienced, s；
I-hydraulic gradient, is set as 0.5.
Vacuum or piling prepressing make plate soil unit test method：
(1) carries out vacuum or piling prepressing model test by predetermined compression ratio, with draining in the model cylinder for pressing in advance
Centered on plate, take out diameter and be not less than 150mm, earth pillar of the length more than 450mm；
(2) the specific purpose tool such as fret saws, diameter 150mm, length 400mm, drain bar length 450mm are rebuild into by earth pillar
The plate soil unit of (two ends respectively grow earth pillar 25mm), wraps up standby with filter cloth；
(3) clamp-ons between drain bar and core groove the drain bar inserted base core groove of plate soil unit one end with rubber ring
Gap and cover cover plate, make drain bar and core groove flexible sealing；
(4) trimmings plate soil unit, makes it in the same size with base and engages good；
(5) the filter cloth that is gone outside board falling soil unit, with holding film cylinder by emulsion film a set of on plate soil unit, lower end and bottom
Seat latex elastic tape tightens sealing；
(6) installing plates soil unit fixed cylinder, latex film upper end turned over to be enclosed within sizing cylinder suitable for reading；
(7) guide sleeves on the set of drain bar upper end, install lid, and drain bar extracts guide sleeves after passing cover core groove, uses
Rubber ring adds a cover plate by gap sealing between drain bar and core groove；
(8) latex films upper end tightens sealing with lid latex elastic tape on plate soil unit；
(9) installs balancing gate pit and top water-flowing device, connection water side head measurement pipeline；
(10) balancing gate pits water inlet, classification plus side pressure consolidation；
(11) the full pressure of surveys water-flowing amount after 60 minutes, and 2~3 hours duplicate measurements water-flowing amounts in interval are until water flowing measuring value is expired
Foot change≤5% in 6 hours；
(12) after water flowings measurements meet error requirements, adjustment head continuously measures 4~5 measuring points, covers head
Drain bar water flowing segment length is in the head scope corresponding to hydraulic gradient i=0.5.
(13) calculates drain bar water-flowing amount according to formula (1)；
(14) drain bar water flowing segment length is measured when removes plate soil unit, the head of correspondence i=0.5 is calculated, different water are used
The dependency relation of the measured water-flowing amount of head, the water-flowing amount that interpolation is calculated is the drain bar water-flowing amount result of the test.
Claims (1)
1. a kind of method of testing of the drain bar water-flowing amount test equipment for considering plate soil interaction, is surrounded by the plate soil list of latex film
First body is arranged in water-flowing amount test pressure room, the water flowing outlet on water-flowing amount test pressure room top, water receiving measurer；Water flowing
The water flowing entrance of test pressure room bottom is measured, is connect and is determined head water inlet；Meanwhile, water-flowing amount test pressure room top, water-flowing amount test
Balancing gate pit bottom picks out water end (W.E.) pressure-measuring pipe and water inlet end pressure-measuring pipe respectively；In the external lateral pressure in balancing gate pit under efferent duct and lateral pressure
Efferent duct, it is characterised in that described plate soil unit is that the soil body is provided between latex film and drain bar, the soil body is mud
Layer；Test pressure is directly acted on latex film by balancing gate pit, then is acted on drain bar by soil body transmission, and its feature exists
In method of testing is one of following operating method：
One, directly charge mud make plate soil unit and test water-flowing amount test method：Step is as follows,
(1) one inserted base core groove of drain bar is clamp-oned the gap between drain bar and core groove and covers cover plate by with rubber ring,
Make drain bar and core groove flexible sealing；
(2) installs bottom discharge plate water-flowing device, connection water inlet pipe and water inlet end head measurement pipeline；
(3) is in the outer installing plate soil unit sizing cylinder of latex film；
Latex film upper end is turned over be enclosed within sizing cylinder it is suitable for reading；
(5) puts drain bar protective case, and too drain bar is polluted when preventing from charging mud；
(6) mud is charged in latex films of the to sizing cylinder support, highly step up drain bar sheath during charging with mud
Until extracting completely；Mud charge close to it is suitable for reading when install and increase cylinder, mud face is higher by sizing cylinder about 2cm suitable for reading；
(7) 18~20 hours are stood on mud plus after 2kg weights；
(8) is removed and is increased cylinder, removes superelevation mud, makes earth pillar highly be 400mm；
(9) guide sleeves on the set of drain bar upper end, install lid, and drain bar extracts guide sleeves, uses rubber after passing cover core groove
Circle adds a cover plate by gap sealing between drain bar and core groove；
(10) latex films upper end tightens sealing with lid latex elastic tape on plate soil unit；
(11) installs balancing gate pit and top water-flowing device, connection water side head measurement pipeline；
(12) balancing gate pits water inlet, classification plus side pressure consolidation；
(13) the full pressure of starts to survey water-flowing amount after 60 minutes, according to drain bar length adjustment test head before measurement, complies with water
Power gradient i=0.5；
2~3 hours duplicate measurements water-flowing amounts in interval, record water flowing flow and water flowing time；Until water flowing measuring value meets 6 hours
Change≤5%, last measured value is the drain bar water-flowing amount result of the test；
Drain bar water-flowing amount is calculated according to formula (1)；
Q-water-flowing amount, cm in formula3/s；
By the water of drain bar, cm in V-t time periods3；
T-pass through the time that V flows are experienced, s；
I-hydraulic gradient, is set as 0.5；
Secondly, vacuum or piling prepressing make plate soil unit test method：Step is as follows,
(1) carries out vacuum or piling prepressing model test by predetermined compression ratio, is with drain bar in the model cylinder for pressing in advance
Center, takes out diameter and is not less than 150mm, earth pillar of the length more than 450mm；
(2) fret saw specific purpose tools, diameter 150mm, the plate soil of length 400mm, drain bar length 450mm are rebuild into by earth pillar
Cell cube, wraps up standby with filter cloth；
(3) is by the drain bar inserted base core groove of plate soil unit one end, between being clamp-oned between drain bar and core groove with rubber ring
Gap simultaneously covers cover plate, makes drain bar and core groove flexible sealing；
(4) trimmings plate soil unit, makes it in the same size with base and engages good；
(5) by emulsion film a set of on plate soil unit, lower end tightens sealing to sizing cylinders with base latex elastic tape；
Installing plates soil unit sizing cylinder, latex film upper end is turned over be enclosed within sizing cylinder it is suitable for reading；
(7) guide sleeves on the set of drain bar upper end, install lid, and drain bar extracts guide sleeves, uses rubber after passing cover core groove
Circle adds a cover plate by gap sealing between drain bar and core groove；
(8) latex films upper end tightens sealing with lid latex elastic tape on plate soil unit；
(9) installs balancing gate pit and top water-flowing device, connection water side head measurement pipeline；
(10) balancing gate pits water inlet, classification plus side pressure consolidation；
(11) the full pressure of surveys water-flowing amount after 60 minutes, and 2~3 hours duplicate measurements water-flowing amounts in interval are until water flowing measuring value satisfaction 6 is small
Shi Bianhua≤5%；
(12) after water flowings measurements meet error requirements, adjustment head continuously measures 4~5 measuring points, head is covered draining
Plate water flowing segment length is in the head scope corresponding to hydraulic gradient i=0.5；
(13) calculates drain bar water-flowing amount according to formula (1)；
(14) drain bar water flowing segment length is measured when removes plate soil unit, the head of correspondence i=0.5 is calculated, with different head institutes
The dependency relation of water-flowing amount is measured, the water-flowing amount that interpolation is calculated is the drain bar water-flowing amount result of the test.
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| CN108411954A (en) * | 2018-05-10 | 2018-08-17 | 中交四航工程研究院有限公司 | Measure the device of draining plate benging water-flowing amount and the soft-soil foundation treatment method based on the device under soil pressure |
| CN109612910A (en) * | 2019-02-22 | 2019-04-12 | 常州工程职业技术学院 | A kind of portable pervious concrete pavement device for testing permeability coefficient and test method |
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| CN201210065Y (en) * | 2008-01-29 | 2009-03-18 | 上海勘测设计研究院 | Longitudinal water flow test instrument for plastic drainage plate with emulsion membrane medium |
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