CN107436140A - The settling column test instrument and test method that vacuum preloading and piling prepressing are combined - Google Patents
The settling column test instrument and test method that vacuum preloading and piling prepressing are combined Download PDFInfo
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- CN107436140A CN107436140A CN201710603195.2A CN201710603195A CN107436140A CN 107436140 A CN107436140 A CN 107436140A CN 201710603195 A CN201710603195 A CN 201710603195A CN 107436140 A CN107436140 A CN 107436140A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
Abstract
The present invention relates to Study on foundation treatment field, it is desirable to provide the settling column test instrument and test method that a kind of vacuum preloading and piling prepressing are combined.Cut-off steel plate is set in settling leg and is connected by hollow rigid casing with displacement transducer, drain bar is set in rigid casing, and its underpart is filled in soil sample.Cover plate is set at the top of settling leg, water pocket is set in the space between cut-off steel plate；Settling leg side wall and rigid casing install vacuum tube and are connected to vavuum pump respectively；Settle column bottom and side wall installs some sensor for pore water pressure；Sensor for pore water pressure and institute's displacement sensors are connected to data collecting system by signal wire.The present invention is simple in construction, is easy to left-hand seat；Preloading value simply and easily can be changed by hydraulic pressure control, effectively obtain change of the different radial position pore pressures in consolidation process；Can automatic record data, reduce experiment needed for human hand, reduce error caused by artificial reading；Cast material and repeatable utilization of banketing, will not cause to waste and pollute.
Description
Technical field
The present invention is the settling leg that more particularly to vacuum preloading and piling prepressing are combined on Study on foundation treatment field
Test instrument and test method.
Background technology
With the high speed development of China's economic society, urbanization process and building cause are also constantly promoting, substantial amounts of high
The buildings such as fast highway, high-speed railway, skyscraper, airport and structures are built in the coastal hair such as the Yangtze River Delta, Pearl River Delta
Up to area.Due to geography and history reason, these areas are dispersed with that natural moisture content is high, natural void ratio is big, high-compressibility, low more
Natural inferior position when making ground be present in infiltrative thick and soft groundsill, this kind of soil layer.Due to its low intensity, foundation bearing capacity and steady
It is qualitative often inadequate, easily cause unstable failure；Because its compressibility high osmosis is low, it will cause building sizable heavy
Drop or differential settlement, and the infall process duration is very long, and the normal use for influenceing building even is jeopardized into building
Safety.Therefore, Soft Clay Foundation usually requires to be handled.
Drainage by shaft wells concretion method is widely used one kind in numerous soft base processing methods, by being set in ground
Vertical drain well (including sand drain, sand wick, plastic draining belt etc.), and it (is typically top knot to combine certain loading mode
Structure own wt, piling prepressing or vacuum preloading) hierarchical loading, the pore water in soft clay is progressively discharged, accelerates soil solidifying
Speed, shortens consolidation time, it is final realize quick enhancing foundation soil strength, improve foundation bearing capacity, reduce ground total settlement and
Differential settlement, ensure the purpose of the stable safety of superstructure.The load mode that piling prepressing is combined with vacuum preloading is in work
It is widely used in journey practice.There is theoretical research to show, the speed of simple vacuum preloading processing Soft Clay Foundation is better than making merely
Use piling prepressing；Vacuum preloading and piling prepressing are in the case where equivalent gross pressure is equal, ratio of the vacuum preloading than piling prepressing
Value is bigger, and radial consolidation coefficient is bigger.But if vacuum method excessively uses, engineering can be caused to spend too high.Also,
It can be used for instructing how vacuum combination piling prepressing should plan the standard arranged currently without one.Therefore, experiment is passed through
The influence of ratio different during vacuum combination piling prepressing and load time arrangement to consolidation is studied, can be to true in Practical Project
The method that sky combines piling prepressing carries out science and economic application.
At present, the settling leg examination that still no integrated use pore pressure distribution measuring and vacuum preloading and piling prepressing are combined
It is available to test instrument.
The content of the invention
The technical problem to be solved in the present invention is to overcome deficiency of the prior art, there is provided a kind of vacuum preloading and preloading
The settling column test instrument and test method that precompressed is combined.
To solve the above problems, the solution of the present invention is：
The settling column test instrument that a kind of vacuum preloading and piling prepressing are combined is provided, including for loading the cylinder of soil sample
The hollow settling leg of shape；A circle to match with its internal diameter laterally cut-off steel plate is provided with the middle part of settling leg, is separated on steel plate
The center on surface is fixed and is connected to a hollow rigid casing；The top of rigid casing connects with displacement transducer, displacement
The other end of sensor is fixed on pipe-hanging hook；The top of a piece drain bar is set in rigid enclosure through after separating steel plate center
Guan Zhong, its part below cut-off steel plate be landfill in soil sample, the bottom of drain bar then with settling leg bottom surface
The heart connects；Drain bar is provided with discharge outlet, and the outside of settling leg is connected to by drainpipe；
Opening at the top of settling leg is provided for the cover plate of sealing, through hole of the rigid casing through cover plate center；Lid
Water pocket made of a rubber membrane is provided with space between plate and cut-off steel plate, sets aqueduct at the top of water pocket, aqueduct passes through
Through hole on cover plate is followed by water pump or water pumper, for the filling into water pocket or pump drainage pressure Cang Shui；In water pocket and settling leg side
Gap installing vacuum tube between wall, vacuum tube is installed at the top of rigid casing, and two vacuum tubes are connected to vavuum pump,
Rigid casing is provided with vacuum meter；
Several sensor for pore water pressure are installed in the sedimentation column bottom to connect with soil sample and side wall；Sensor for pore water pressure and institute's rheme
Displacement sensor is connected to data collecting system by signal wire.
In the present invention, the sensor for pore water pressure for settling column bottom is arranged in and accounted in the sector of base area 1/4, at interval of
5 sensor for pore water pressure are equally spaced on 30 ° of radius；Height placement at interval of 125mm in settling leg side wall several is in
The sensor for pore water pressure laterally arranged, per sensor for pore water pressure of the quantity and position of round pressure sensor with being arranged along bottom surface radius
Corresponding, the row of highest one is arranged in the position of test instrument mid-height.
In the present invention, from the bottom of drain bar at cover plate, a vacuum sensor is arranged at interval of 10cm, respectively
Vacuum sensor is connected to data collecting system by signal wire.
In the present invention, in the inner surface setting hydrophobic material coating of settling leg.
In the present invention, the base for the level of adjusting is set in the lower section of settling leg.
Realized and fixed by buckle or bolt in the present invention, between the opening at the top of cover plate and settling leg, set between the two
Seal washer.
In the present invention, it is provided for positioning the fixing device of drain bar in sedimentation column bottom.
The present invention still further provides vacuum preloading based on foregoing settling column test instrument and piling prepressing is combined
Settling column test method, it is by the precompressed of soil sample applying vacuum and piling prepressing pressure, and combines vertical drainage passage, make soil
Body consolidates, and by being monitored in real time to the pore pressure in consolidation process and displacement, studies in consolidation process at diverse location
Pore pressure change；
The test method specifically includes following step：
(1) drain bar is fitted into settling leg in the fixing device for being used for positioning, each sensor is connected to data acquisition
System, and ensure to connect accurate, No leakage；
(2) soil sample is filled into settling leg, the height of filling should ensure that reserving enough spaces carries out top preloading；
(3) cut-off steel plate is placed on soil sample surface, and drain bar is penetrated in rigid casing；Cover plate is installed after laying water pocket
And sealing is checked, displacement transducer is installed；
(4) by water pump into water pocket injected clear water, switched off the pump after reaching pre- constant load and valve；
(5) vavuum pump is opened to vacuumize；Meanwhile the water discharging valve of drain bar is opened, discharge the pore water in soil sample；
(6) when reach following condition for the moment, off-test：
Pressure value shown in sensor for pore water pressure keeps constant within a period of time；Or sedimentation value exists shown in displacement transducer
Kept in a period of time constant；Or there is no pore water discharge；
(7) after off-test, recovery test soil, settling leg is cleared up, at the data obtained to data collecting system
Reason.
In the present invention, the depth of fill is controlled, soil sample is still higher than one sensor for pore water pressure of highest after consolidation.
The operation principle of the present invention：Change loading environment during experiment, to consolidate soil sample pore pressure radial distribution and settle into
Row monitoring, obtain the related information of pore pressure in consolidation process, so as to obtain relation between load mode and consolidation rate and
The distribution of diverse location pore pressure and variation relation.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) present invention can effectively obtain change of the different radial position pore pressures in consolidation process, for further
Research.
(2) present invention simply and easily can change preloading value by hydraulic pressure control, be easy to study Loading different time
The problem of different size.
(3) present invention is simple in construction, is easy to left-hand seat.Cast material and banket it is repeatable utilize, will not cause to waste and
Pollution, and can automatic record data, reduce experiment needed for human hand, while reduce error caused by artificial reading.
Brief description of the drawings
Fig. 1 is the main view profile of test instrument of the present invention (not including data collecting system).
Fig. 2 is the side cutaway view of test instrument in Fig. 1.
Fig. 3 be Fig. 1 in A-A to top plan view.
Fig. 4 is the top plan view of B-B direction in Fig. 1.
Reference in figure is：1 displacement transducer (LVDT)；2 rigid casings；3 water pockets；4 vacuum tubes；5 water pockets；6 is heavy
Post drops；7 cut-off steel plates；8 sensor for pore water pressure；9 drain bars；10 bases；11 cover plates；12 vacuum meters.
Embodiment
The settling column test instrument that vacuum preloading and piling prepressing in the present invention are combined is as Figure 1-4.Test instrument bag
Include the cylindrical, hollow settling leg 6 for loading soil sample；The circle to match with its internal diameter a horizontal stroke is provided with the middle part of settling leg 6
To cut-off steel plate 7, the center of cut-off steel plate 7 upper surface, which is fixed, is connected to a hollow rigid casing 2；Rigid casing 2
Top connects with displacement transducer 1, and the other end of displacement transducer 1 is fixed on pipe-hanging hook；Wear on the top of a piece drain bar 9
It is set in after crossing the center of cut-off steel plate 7 in rigid casing 2, it positioned at the part of the lower section of cut-off steel plate 7 is filled in soil sample,
Center of the bottom of drain bar 9 then with the bottom surface of settling leg 6 connects；Drain bar 9 is provided with discharge outlet, and be connected to by drainpipe it is heavy
The outside of post 6 drops；
Opening at the top of settling leg 6 is provided for the cover plate 11 of sealing, and rigid casing 2 is logical through the center of cover plate 11
Hole；Water pocket 5 made of a rubber membrane is provided with space between cover plate 11 and cut-off steel plate 7, the top of water pocket 5 sets aqueduct,
Aqueduct is followed by water pump or water pumper by the through hole on cover plate 11, and water pump is used for filling pressure Cang Shui, water pumper into water pocket 5
For the pump drainage pressure Cang Shui from water pocket 5；Gap installing vacuum tube between water pocket 5 and the side wall of settling leg 6, in rigid casing
2 top installing vacuum tube, two vacuum tubes are connected to vavuum pump, vacuum meter 12 are provided with rigid casing 2；
Realized and fixed by buckle or bolt between the opening at cover plate 11 and the top of settling leg 6, set sealing gasket between the two
Circle.The inner surface setting hydrophobic material coating of settling leg 6.It is provided for positioning the fixed dress of drain bar 9 in the bottom of settling leg 6
Put.In the lower section of settling leg 6, the base 10 for the level of adjusting is set.
Several sensor for pore water pressure 8 are installed in the bottom of settling leg 6 to connect with soil sample and side wall；Sensor for pore water pressure 8 and position
Displacement sensor 1 is connected to data collecting system by signal wire.The sensor for pore water pressure 8 of the bottom of settling leg 6, which is arranged in, accounts for bottom surface face
In the sector of product 1/4,5 sensor for pore water pressure 8 are equally spaced on the radius at interval of 30 °；It is every in the side wall of settling leg 6
The height placement for being spaced 125mm is several equal in the sensor for pore water pressure 8 laterally arranged, the quantity of every round pressure sensor 8 and position
It is corresponding with the sensor for pore water pressure 8 arranged along bottom surface radius.From the bottom of drain bar 9 at cover plate 11, at interval of 10cm
A vacuum sensor is arranged, each vacuum sensor is connected to data collecting system by signal wire.
In the present invention, water pump, water pumper, water pocket and respective line and valve form preloading pressure system, for heavy
Drop the soil sample loaded in post 6 and apply preloading pressure.Vavuum pump, vacuum tube and respective line and valve form vacuum pressure system
System, the water in soil sample is discharged for the soil sample applying vacuum pressure to loading in settling leg 6, while by drain bar 9, makes soil
Body consolidates.The pore pressure that the different measuring points in consolidation process are measured using sensor for pore water pressure 8 is changed, and is surveyed using displacement transducer 1
The soil body sedimentation in whole process is measured, obtains pore pressure with time and the rule of change in location.The test instrument can be consolidated to barged-in fill
Pore pressure change and the sedimentation rule of development during knot are studied, and experiment is easy to left-hand seat, visual result.
The settling column test method that vacuum preloading and piling prepressing based on foregoing settling column test instrument are combined, is to pass through
To the precompressed of soil sample applying vacuum and piling prepressing pressure, and vertical drainage passage is combined, consolidate the soil body, by consolidation
During pore pressure and displacement monitored in real time, study the pore pressure change at diverse location in consolidation process；
The test method specifically includes following step：
(1) drain bar 9 is fitted into settling leg 6 in the fixing device for being used for positioning, each sensor is connected to data and adopted
Collecting system, and ensure to connect accurate, No leakage；
(2) soil sample is filled into settling leg 6, the height of filling should ensure that reserving enough spaces carries out top preloading；Control
The depth of fill processed, soil sample is set to be still higher than one sensor for pore water pressure 8 of highest after consolidation.
(3) cut-off steel plate 7 is placed on soil sample surface, and drain bar 9 is penetrated in rigid casing 2；Installed after laying water pocket 5
Cover plate 11 simultaneously checks sealing, installs displacement transducer 1；
(4) by water pump into water pocket 5 injected clear water, switched off the pump after reaching pre- constant load and valve；
(5) vavuum pump is opened to vacuumize；Meanwhile the water discharging valve of drain bar 9 is opened, discharge the pore water in soil sample；
(6) when reach following condition for the moment, off-test：Pressure value shown in sensor for pore water pressure 8 is protected within a period of time
Hold constant；Or sedimentation value shown in displacement transducer 1 keeps constant within a period of time；Or there is no pore water discharge；
(7) after off-test, recovery test soil, settling leg 6 is cleared up, at the data obtained to data collecting system
Reason.
Specific embodiment：
It is described in detail with reference to example to improving barged-in fill settling column test research method, for convenience of description,
General proportion can be disobeyed and do partial enlargement by representing the schematic diagram of apparatus structure, should not in this, as limitation of the invention, in addition,
In the making of reality, the three-dimensional space of length, width and height should be included.
Settling leg 6 be open top bottom lock cylindrical glass container, internal diameter 60cm, container side wall thickness 1cm；Heavy
Drop and be provided with 16 hole slots on four radiuses of 30 ° of the bottom interval of post 6, side wall is provided with 4 rows and often arranges 4 totally 4 × 4=16 holes
Groove, wherein being 12.5cm per the spacing of round groove in height, these hole slots are for installing sensor for pore water pressure 8.In order to avoid soil
In body consolidation process, inwall causes excessive friction, and the inner surface of settling leg 6 scribbles hydrophobic material, to weaken wall effect
Influence.In addition, placing adjustable base 10 below settling leg 6, base 10 ensures to sink equipped with the screw for adjusting height
Drop post 6 bottom surface is horizontal.The top of settling leg 6 has slightly larger than the section of settling leg 6 and has the cover plate 11 of flangeseal
As sealing.
Loading system includes preloading pressure system and vacuum pressure system.Wherein preloading pressure is mainly by using water pump 3
Inject water into the chamber of the top water pocket 5 of settling leg 6, and then by separating steel plate 7 by pressure transmission to bottom soil sample surface come real
It is existing.Vacuum pressure connects vavuum pump 4 by vacuum tube, and using hand-type joint connection vacuum tube and drain bar 9, come the row of offer
Negative pressure in water plate 9.To avoid making drain bar 9 outside because cut-off steel plate 7 causes drain bar 9 to be exposed on soil body sedimentation sinking
Vacuum declines, and a vacuum tube is also arranged on the top of drain bar 9, and it is connected with vavuum pump, to ensure to separate steel plate 7
The vacuum in the whole space in top.
Drainage system includes the drain bar 9 and vavuum pump for being inserted in soil sample center.Most of water in soil sample passes through drain bar 9
Integral plastic drainage board common in engineering may be selected in discharge, drain bar 9.Pay attention to keeping drain bar during loading bankets
9 positions are constant and do not bend.Minimal amount of water tightly can not possibly enter top from its edge completely because cut-off steel plate 7 seals
Cavity in, this part water is discharged by vacuum tube.Drain bar 9 is connected to vacuum tube by hand-type seal nipple and pipeline.Rigidity
Sleeve pipe 2 uses metal material, can be connected through a screw thread or welding manner is fixed on cut-off steel plate 7, its internal diameter should allow to put
Enter drain bar 9.
Measuring system includes the sensor for pore water pressure 8 positioned at settling leg side and bottom surface and is connected to cut-off by rigid casing 2
The displacement transducer 1 of steel plate 7, and the vacuum sensor on drain bar.Sensor for pore water pressure 8 is sensed using micro pore pressure
Device, the tapping from the surface of settling leg 6 of popping one's head in stretch into, and tail data line stays in outside and is connected with data collecting system；Installing
During should be noted the spacing of multiple probes, avoid contacting between probe.Displacement transducer 1 is connected to cut-off by rigid casing 2
Steel plate 7, sink to driving by cut-off steel plate 7, so as to obtain sedimentation related data.
Data collecting system is per the reading for recording connected probe automatically at regular intervals, for reading and recording
Pore pressure data at different moments.Data collecting system can use existing hardware to realize that those skilled in the art can be according to this hair
Prior art means are used to realize correlation function by the bright function, due to these contents and non-invention emphasis, therefore
Repeat no more.
Sealing and connection system include the connection of sensor for pore water pressure 8 and settling leg 9, the company of rigid casing 2 and cut-off steel plate 7
Connect, the connection of rigid casing 2 and cover plate 11, cover plate 11 and the connection of settling leg 6.Wherein sensor for pore water pressure 8 and the company of settling leg 6
Connect and use XX joints, connection of the rigid casing 2 with separating steel plate 7, which uses, to be threadedly coupled or weld, rigid casing 2 and cover plate 11
The method that connection is sealed using similar cylinder piston, the sealing between cover plate 11 and settling leg 6 are close using flange connection encryption seal
The method of envelope.
The improvement barged-in fill settling column test device and test method, can to the consolidation process of barged-in fill in settling leg and
During pore pressure along being monitored with time and change in location, pass through the time of the ratio for changing two kinds of load modes and loading
Can also be on these aspects on influenceing to study caused by consolidation.
Specifically include following step：
(1) settling leg inspection and leveling：The probe of sensor for pore water pressure 8 is fixed on finger by settling leg 6 in manufacturing process
Positioning is put, and is sealed.Therefore, it is necessary to carry out the installing port of sensor for pore water pressure 8 before being tested using settling leg 6
Leak check.In addition, cut-off steel plate 7 is put into by examination, check whether size is suitable.Adjust the bearing 10 of the bottom of settling leg 6
Level height, make settling leg 6 horizontal positioned.
(2) monitoring system and the installation of settling leg inner water drainage system：The tail wire that sensor for pore water pressure 8 is popped one's head in and data acquisition
System is connected, and sensor is checked, checks whether that each sensor can normal work.It is heavy that vertical drainage plate 9 is inserted
Drop post 6 is hit exactly, and is carried out simply fixed, it is ensured that installation site is accurate.
(3) load and banket：The soil sample fetched of scene is fitted into settling leg 6, to testing program specified location near when stop
Dress soil.
(4) installation cut-off steel plate 7 and settlement measuring device：The rigid casing 2 for separating steel plate 7 and being attached thereto is placed on
The top of the soil body；It is first hanging to place, then water pocket 5 is arranged again, vacuum tube and drain bar 9 are attached, another side and
Vavuum pump connects.Wherein drain bar 9 is attached with vacuum tube with hand-type joint, and two vacuum tubes, which converge, is followed by vavuum pump
On.Then steel plate 7, cover plate 11 and displacement transducer 1 putting down slowly together will be separated, carry out sealing fastening.
(5) start water flowing, when water will be filled, vavuum pump is opened, starts to vacuumize, start the lower section soil body solid
Knot.
(6) when reach following condition for the moment, off-test：Pressure value shown in sensor for pore water pressure 8 is protected within a period of time
Hold constant；Or sedimentation value shown in displacement transducer 1 keeps constant within a period of time；Or there is no pore water discharge；
Illustrate that consolidation process is basically completed above.
(7) after off-test, recovery settling leg and experiment soil, and carry out data processing.
Points for attention in experiment：
(1) after testing installation, open vavuum pump examination and take out, the operating efficiency and model test sealing for checking vavuum pump are
It is no tight, corresponding seal approach is then taken if any gas leak phenomenon.
(2) under-membrance vacuum degree in diaphragm seal should be stably maintained at more than 85KPa.
(3) before opening vavuum pump, penstock must be first opened, forbids the anhydrous air transport of vavuum pump.
(4) during off-test, while cut off the electricity supply switch and recirculated water valve, prevent current suck-back phenomenon.
Finally it should be noted that be it is listed above be only one of purposes of the present invention.In addition, the present invention can be with
There are many other usages.Pulled water out during for example, to characterize the situation for removing preloading pressure, or vavuum pump is closed, with table
Sign removes the situation of vacuum pressure.One of ordinary skill in the art directly can export or associate from present disclosure
All deformations arrived, are considered as protection scope of the present invention.
Claims (9)
1. the settling column test instrument that a kind of vacuum preloading and piling prepressing are combined, including for loading the cylindrical, hollow of soil sample
Settling leg；Characterized in that, being provided with a circle to match with its internal diameter laterally cut-off steel plate in the middle part of settling leg, separate steel
The center of plate upper surface is fixed and is connected to a hollow rigid casing；The top of rigid casing connects with displacement transducer,
The other end of displacement transducer is fixed on pipe-hanging hook；The top of a piece drain bar is set in just through after separating steel plate center
Property sleeve pipe in, its part below cut-off steel plate be landfill in soil sample, the bottom of drain bar then with settling leg bottom surface
Center connect；Drain bar is provided with discharge outlet, and the outside of settling leg is connected to by drainpipe；
Opening at the top of settling leg is provided for the cover plate of sealing, through hole of the rigid casing through cover plate center；Cover plate with
Separate and water pocket made of a rubber membrane is provided with the space between steel plate, set aqueduct at the top of water pocket, aqueduct passes through cover plate
On through hole be followed by water pump or water pumper, for into water pocket filling or pump drainage pressure Cang Shui；In water pocket and settling leg side wall
Between gap installing vacuum tube, rigid casing top install vacuum tube, two vacuum tubes are connected to vavuum pump, firm
Property sleeve pipe is provided with vacuum meter；
Several sensor for pore water pressure are installed in the sedimentation column bottom to connect with soil sample and side wall；Sensor for pore water pressure and the displacement pass
Sensor is connected to data collecting system by signal wire.
2. settling column test instrument according to claim 1, it is characterised in that the sensor for pore water pressure for settling column bottom is arranged in
Account in the sector of base area 1/4,5 sensor for pore water pressure are equally spaced on the radius at interval of 30 °；In settling leg side
Height placement on wall at interval of 125mm is several in the sensor for pore water pressure laterally arranged, quantity and position per round pressure sensor
Put corresponding with the sensor for pore water pressure arranged along bottom surface radius.
3. settling column test instrument according to claim 1, it is characterised in that from the bottom of drain bar at cover plate,
A vacuum sensor is arranged at interval of 10cm, each vacuum sensor crosses signal wire and is connected to data collecting system.
4. according to the settling column test instrument described in claims 1 to 3 any one, it is characterised in that in the interior table of settling leg
Face sets hydrophobic material coating.
5. according to the settling column test instrument described in claims 1 to 3 any one, it is characterised in that in the lower section of settling leg
The base for the level of adjusting is set.
6. according to the settling column test instrument described in claims 1 to 3 any one, it is characterised in that cover plate and sedimentation capital
Realized and fixed by buckle or bolt between the opening in portion, set seal washer between the two.
7. according to the settling column test instrument described in claims 1 to 3 any one, it is characterised in that set in sedimentation column bottom
Put the fixing device for positioning drain bar.
8. the settling column test side being combined based on the vacuum preloading of settling column test instrument and piling prepressing described in claim 1
Method, it is characterised in that be by the precompressed of soil sample applying vacuum and piling prepressing pressure, and combine vertical drainage passage, make soil
Body consolidates, and by being monitored in real time to the pore pressure in consolidation process and displacement, studies in consolidation process at diverse location
Pore pressure change；
The test method specifically includes following step：
(1) drain bar is fitted into settling leg in the fixing device for being used for positioning, each sensor is connected to data collecting system,
And ensure to connect accurate, No leakage；
(2) soil sample is filled into settling leg, the height of filling should ensure that reserving enough spaces carries out top preloading；
(3) cut-off steel plate is placed on soil sample surface, and drain bar is penetrated in rigid casing；Cover plate is installed after laying water pocket and is examined
Sealing is looked into, displacement transducer is installed；
(4) by water pump into water pocket injected clear water, switched off the pump after reaching pre- constant load and valve；
(5) vavuum pump is opened to vacuumize；Meanwhile the water discharging valve of drain bar is opened, discharge the pore water in soil sample；
(6) when reach following condition for the moment, off-test：
Pressure value shown in sensor for pore water pressure keeps constant within a period of time；Or sedimentation value shown in displacement transducer is at one section
Kept in time constant；Or there is no pore water discharge；
(7) after off-test, recovery test soil, settling leg is cleared up, the data obtained to data collecting system are handled.
9. according to the method for claim 8, it is characterised in that the control depth of fill, soil sample is still higher than after consolidation
One sensor for pore water pressure of highest.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710603195.2A CN107436140B (en) | 2017-07-22 | 2017-07-22 | Settling column tester combining vacuum preloading and surcharge preloading and testing method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710603195.2A CN107436140B (en) | 2017-07-22 | 2017-07-22 | Settling column tester combining vacuum preloading and surcharge preloading and testing method |
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| CN107436140B CN107436140B (en) | 2023-04-11 |
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| CN109307622A (en) * | 2018-11-05 | 2019-02-05 | 浙江工业大学 | The settling column test instrument and test method that lateral pressure and vacuum preloading combine |
| CN109342150A (en) * | 2018-12-19 | 2019-02-15 | 中国科学院武汉岩土力学研究所 | A kind of experimental rig and method for gassiness soil sample consolidation test and permeability test |
| CN110761267A (en) * | 2019-11-18 | 2020-02-07 | 清华大学 | Rapid prepressing and consolidating device and method for underwater soft soil foundation |
| CN111926794A (en) * | 2020-06-22 | 2020-11-13 | 温州大学 | Experimental device for measuring vacuum degree and pore pressure of soil body at certain point under vacuum consolidation state and test operation method thereof |
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| CN111926794B (en) * | 2020-06-22 | 2022-04-01 | 温州大学 | Experimental device for measuring vacuum degree and pore pressure of soil body at certain point under vacuum consolidation state and test operation method thereof |
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| CN113336407B (en) * | 2021-06-08 | 2022-08-05 | 温州大学 | Treatment device and treatment method for dredged sludge |
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