CN106353480B - The test method of the cementing fine grained soil of microorganism under negative pressure - Google Patents
The test method of the cementing fine grained soil of microorganism under negative pressure Download PDFInfo
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Abstract
The invention discloses a kind of test method of the cementing fine grained soil of microorganism under negative pressure, which is completed using negative pressure solidification equipment, and the negative pressure solidification equipment includes feed flow part, cementation solidifying part and negative pressure drawing liquid part；The test method uses following steps：1) voltage stabilizing is set；2) soil sample is installed；3) it is saturated soil sample；4) negative pressure value and the relationship into flow velocity are established, determines cementing negative pressure value；5) cementing preparation；6) bacterium is noted；7) consolidating fluid is noted；8) circulating repetition step 6)~7) at least 1 time, in circulating repetition step 6)~7) before, the valve III is opened, it is cementing to finish.The present invention can reach the steady seepage of 1 2ml/min of test requirements document by adjusting vacuum degree control vacuum magnitude, to control the percolation flow velocity of bacterium solution and consolidating fluid in fine grained soil, realize application of the microorganism induction tosca technology in fine grained soil.
Description
Technical field
The present invention relates to a kind of curings of fine grained soil, more particularly to the cementing fine grained soil of microorganism under a kind of negative pressure
Test method.
Background technology
Currently, the method for basement process please refers to Chinese Academy of Sciences's Cheng Jian bases in 1994 in ground frequently with grouting technique
The second chapter grouting skill of integrated application of the grouting technique that the 5th 89-93 pages of the phase of engineering journal delivers in Soft Ground
The Exploration of Mechanism of art reinforcing flexible foundation, using send pressure equipment will cured slurry material pass through drilling and inject particle in stratum
In gap, the interface of soil layer or rock crack, make its expansion, cementing, solidification, to reduce the permeability on stratum, enhancing stratum is strong
Degree prevents settlement of foundation, deformation, the processing skill that mechanical property and hydrophysical property to make soil layer (rock stratum) are all improved
Art.Traditional grouting technique has many limitations, please refer to Guangzhou in 2006 build Pueraria lobota man of Science and Technology Commission it is good
The second chapter of the development and prospect of 3384-3392 pages of CHEMICAL GROUTING TECHNOLGY delivered of Chinese Journal of Rock Mechanics and Engineering supplementary issue (2)
Grouting material, slip casting destructible soil structures under high pressure, and the grouting material used typically contains noxious material, has very to environment
Big adverse effect.And the viscosity of grouting material is larger, and grouting radius is smaller, and required injected hole is more, is brought very to construction
It is mostly troublesome.In recent years, with biology, chemistry, mechanics and the multi-disciplinary crossing research of materialogy, certain is found in nature
Biology can generate enzyme by the vital movement of itself slightly, and enzyme, which occurs, with ambient enviroment substance reacts, and then changes with other
It learns substance mineralising and forms other binding materials such as calcite.By this mineralising mechanism in laboratory applications research, it is developing progressively
For a kind of new technology, i.e. microorganism induction tosca technology (MICP).Please refer to Southeast China University Qian Chunxiang in 2015 et al.
In the chapter 1 introduction for the microorganism consolidation by grouting soil body progress that rock mechanics the 6th 1537-1548 pages of the phase of volume 36 delivers.
Current this microorganism induction tosca technology be still based on laboratory research, primarily directed to the cementing of medium-fine sand,
It is general only to use peristaltic pump that can carry out microorganism grouting since the porosity of sand is good and percolation path circulates.Peristaltic pump
Operation instruction to please refer to Central China University of Science and Technology's ground in 2017 and underground engineering research institute Cui Ming beautiful et al. in rock-soil mechanics the
The bacterium solution injection system that 3173-3178 pages of the o. 11ths of volume 38 are delivered influences experimental study to microorganism solidification sand dynamic characteristics
2.2 testing program of second chapter is prepared with sample.And the fine grain soil such as silt, silty clay, permeability are smaller, consolidating fluid
With bacterium solution under the pumping of peristaltic pump, it is difficult to be flowed in fine grained soil.
Invention content
The present invention provides the cementing fine grained soil of microorganism under a kind of negative pressure to solve technical problem present in known technology
Test method, the mineralising that MICP technologies can be used successfully to fine grained soil using this method is cementing.
The present invention is adopted the technical scheme that solve technical problem present in known technology：Micro- life under a kind of negative pressure
The test method of the cementing fine grained soil of object, the test method are completed using negative pressure solidification equipment, and the negative pressure solidification equipment includes supplying
Liquid part, cementation solidifying part and negative pressure drawing liquid part；The feed flow part includes adjustable for height supplying bottle；It is described cementing solid
Change part include cementitious test sand column, the cementitious test sand column include sample loading cylinder body and with its seal affixed upper cover and under
Lid is equipped with the liquid inlet and air inlet being connect with the supplying bottle on the cover, and valve I is equipped on the liquid inlet,
It is equipped with valve II on the air inlet, liquid outlet is equipped on the lower lid, valve III is equipped on the liquid outlet, in institute
The lower part for stating sample loading cylinder body is equipped with permeable disk, multiple uniformly distributed acicular pores is equipped on the permeable disk, the permeable disk is by ring
Shape holder is supported on the lower lid, and coarse sands layer II is equipped on the permeable disk, and soil is equipped on the coarse sands layer II
Work cloth bed course II is equipped with the geotextiles bed course I being laid on soil sample upper surface in the sample loading cylinder body and is laid on the soil
Coarse sands layer I on work cloth bed course I；Negative pressure drawing liquid part includes sequentially connected vacuum fluid reservoir, vacuumizes tank and vacuum
Pump is equipped with pumping inlet and leakage fluid dram in the bottom of the vacuum fluid reservoir, valve IV is equipped on the pumping inlet,
Valve V is equipped on the leakage fluid dram, the pumping inlet is connect with the liquid outlet, on the top of the vacuum fluid reservoir
Portion is equipped with vacuum meter I and vacuum orifice, is equipped with valve VI on the vacuum orifice, the vacuum orifice and described vacuumizes tank
Top connected by communicating pipe, on the communicating pipe be equipped with pressure regulator valve, the top for vacuumizing tank be equipped with electric contact
Vacuum meter, the electric contact vacuum meter control the startup and closing of the vacuum pump；The test method uses following steps：1) it sets
Determine voltage stabilizing:In the case where the vacuum fluid reservoir air-tightness is intact, the valve VI is opened, closes the valve IV and described
Then valve V sets the upper lower limit value of the electric contact vacuum meter, then starts the vacuum pump, then by described in adjusting
Pressure regulator valve makes the negative pressure value in the vacuum fluid reservoir stabilize to saturation soil sample preset negative pressure value, the electric contact vacuum meter
Lower limiting value is more than the saturation soil sample preset negative pressure value；2) soil sample is installed:The lower cover is tightened, the permeable disk is packed into the dress
Sample cylinder is laid with the coarse sands layer II and the geotextiles bed course II, in the sample loading cylinder body in the upper surface of described permeable disk
Vaseline is smeared in side, is layered native sample compacting to design height according to the soil sample parameter of test requirements document, is laid in the soil sample
Geotextiles bed course I, is laid with coarse sands layer I on the geotextiles bed course I, and the soil sample installs, the upper cover is tightened；3)
It is saturated soil sample:3.1) height for adjusting the supplying bottle, makes it higher than the cementitious test sand column, closes the valve I, then
Enough tap water are packed into the supplying bottle；3.2) valve III and the valve IV are opened, the valve II is closed,
When the negative pressure in the vacuum fluid reservoir is stablized again to saturation soil sample preset negative pressure value, the valve I is opened, tap water exists
The soil sample is penetrated under the action of gravity and negative pressure, and finally flows into the vacuum fluid reservoir；3.3) when discovery has water to enter institute
When stating vacuum fluid reservoir, the soil sample saturation finishes, and the volume of tap water, is denoted as saturation soil sample water used in record saturation soil sample
Amount；4) negative pressure value and the relationship into flow velocity are established, determines cementing negative pressure value:4.1) valve II is opened, the coarse sand is made
The water column of 3~5cm is accumulated in I top of layer, closes the valve I, the time t of 2cm water columns needs is oozed under measurement, obtains lower seepage flow speed
V, v=2cm* sand cylinder floor space/t；4.2) upper lower limit value of the electric contact vacuum meter is adjusted, and by adjusting the pressure regulation
Valve makes the negative pressure value in the vacuum fluid reservoir stabilize to a certain default negative pressure value, then opens the valve I, repeats step
4.1)；4.3) multiple circulating repetition step 4.2) records and presets negative pressure value and corresponding lower seepage flow speed, and draws preset negative
Current curve is oozed under pressure value-, finds the negative pressure value under test requirements document corresponding to seepage flow speed as cementing negative pressure value；By test requirements document
Lower seepage flow speed is used as flow velocity；5) cementing preparation:Close the valve II；Negative pressure value in vacuum fluid reservoir is adjusted to step
The rapid cementing negative pressure value 4) determined；The tap water being vented in supplying bottle, prepares enough bacterium solutions and consolidating fluid；6) bacterium is noted：By bacterium solution
It is put into the supplying bottle, open the valve I and controls its aperture, bacterium solution is made to enter flow velocity and the examination of the cementitious test sand column
The lower seepage flow speed for testing requirement is identical, when the bacterium solution volume for entering the cementitious test sand column is more than saturation soil sample water consumption, closes
The valve I and the valve III are closed, after so that bacterium solution is stood a setting duration in the soil sample, the valve VI is closed, beats
The valve V is opened, the liquid in the vacuum fluid reservoir is cleaned out；It is then shut off the valve V, opens the valve VI,
The negative pressure in the vacuum fluid reservoir is set to stabilize to cementing negative pressure value again；7) consolidating fluid is noted：7.1) consolidating fluid is put into described
Supplying bottle opens the valve I and the valve III, controls the aperture of the valve I, and consolidating fluid is made to enter the cementitious test
The flow velocity of sand column is identical as the lower seepage flow speed of test requirements document, when consolidating fluid enters the volume and step 6) of the cementitious test sand column
In bacterium solution volume used it is equal when, close the valve I and the valve III, consolidating fluid made to stand a setting duration in soil；
The valve VI is closed, the valve V is opened, cleans out the liquid in the vacuum fluid reservoir；It is then shut off the valve
V, the valve VI is opened, the negative pressure in the vacuum fluid reservoir is made to stabilize to cementing negative pressure value again；7.2) step is repeated
7.1) 3-5 times；8) circulating repetition step 6)~7) at least 1 time, in circulating repetition step 6)~7) before, open the valve
III, it is cementing to finish.
The feed flow part includes a bottle stand, and there are two the supplying bottles, and two supplying bottles use organic glass system
At, the graduated scale being arranged along its axis direction is equipped on the side wall of the supplying bottle, two supplying bottles respectively pass through one
Lifting rope is hung on the bottle stand, and the lifting rope pile warp fixed pulley is simultaneously wrapped on reel, and the reel and the pulley are respectively mounted
On the bottle stand, it is equipped with rocking handle on the reel, rocking handle fixed structure is equipped on the bottle stand；The liquid inlet is equipped with
With two one-to-one two of supplying bottles.
It is equipped with vacuum meter II at the top for vacuumizing tank.
The valve I, the valve II, the valve III, the valve IV, the valve V and the valve VI are adopted
Use plug valve.
The sample loading cylinder body is equipped with along its axial direction side on the side wall of the sample loading cylinder body using made of organic glass
To the graduated scale of setting.
The invention has the advantages and positive effects that：It can be by adjusting vacuum degree control vacuum magnitude, to control
The percolation flow velocity of bacterium solution and consolidating fluid in fine grained soil reaches the steady seepage of test requirements document 1-2ml/min, realizes that microorganism lures
Lead application of the tosca technology in fine grained soil.Bottle height degree is supplied by adjusting and plug valve controls feed speed, and can be matched
The various sizes of cementing fine grained soil of cementitious test sand column is closed, is conducive to later stage cementing effect detection, effectively solves soil body permeability
The problem of small hardly possible seepage flow.In test each parameter can be controlled effectively, become quantity research convenient for experiment, and can freely fill sample and unload
Sample, it is easily operated.
Description of the drawings
Fig. 1 is the structural schematic diagram for the cementing device of negative pressure that the present invention applies.
In figure：1, bottle stand, 2, supplying bottle, 3, lifting rope, 4, upper cover, 4-1, liquid inlet, 4-2, valve I, 4-3, valve II, 5,
Coarse sands layer I, 6, geotextiles bed course I, 7, soil sample, 8, sample loading cylinder body, 9, geotextiles bed course II, 10, coarse sands layer II, 11, permeable disk,
12, ring support, 13, lower cover, 13-1, valve III, 14, vacuum fluid reservoir, 14-1, valve IV, 14-2, valve V, 14-3, valve
Door VI, 15, vacuum pump, 16, pressure regulator valve, 17, communicating pipe, 18, vacuum meter I, 19, electric contact vacuum meter, 20, vacuum meter II, 21,
Vacuumize tank.
Specific implementation mode
In order to further understand the content, features and effects of the present invention, the following examples are hereby given, and coordinate attached drawing
Detailed description are as follows：
Referring to Fig. 1, under a kind of negative pressure the cementing fine grained soil of microorganism test method, this method use negative pressure solidification equipment
It completes, the negative pressure solidification equipment includes feed flow part, cementation solidifying part and negative pressure drawing liquid part.
The feed flow part includes adjustable for height supplying bottle 2.In the present embodiment, the concrete structure of the feed flow part
For：Including a bottle stand 1, there are two the supplying bottles 2, and two supplying bottles 2 are respectively hung over by a lifting rope 3 on the bottle stand 1,
3 pile warp fixed pulley of the lifting rope is simultaneously wrapped on reel, and the reel and the pulley are installed on the bottle stand 1, in institute
It states reel and is equipped with rocking handle, rocking handle fixed structure is equipped on the bottle stand 1.The present embodiment, using two supplying bottles, a use
In supply bacterium solution, another, can be to avoid connection flexible pipe be replaced for supplying consolidating fluid, can be by folding and unfolding lifting rope to adjust
The height of supplying bottle 2 is stated, and then determines the basic head and flow velocity of bacterium solution and consolidating fluid.Two supplying bottles 2 are using organic
Made of glass, it is equipped with the graduated scale being arranged along its axis direction on the side wall of supplying bottle 2, can conveniently calculate for liquid
Product.
The cementation solidifying part includes cementitious test sand column, the cementitious test sand column include sample loading cylinder body 8 and and its
Affixed upper cover 4 and lower cover 13 are sealed, the liquid inlet 4-1 being connect with the supplying bottle 2 and air inlet are equipped in the upper cover 4
Mouthful, in the present embodiment, the liquid inlet 4-1 is equipped with and two supplying bottles 2 one-to-one two.In the liquid inlet
4-1 is equipped with valve I 4-2, and II 4-3 of valve is equipped on the air inlet, liquid outlet is equipped on the lower cover 13, described
Liquid outlet is equipped with III 13-1 of valve, is equipped with permeable disk 11 in the lower part of the sample loading cylinder body 8, is equipped on the permeable disk 11
Multiple uniformly distributed acicular pores, the permeable disk 11 are supported on by ring support 12 on the lower cover 13, on the permeable disk 11
It is equipped with coarse sands layer II 10, geotextiles bed course II 9 is equipped on the coarse sands layer II 10, is equipped in the sample loading cylinder body 8
The geotextiles bed course I 6 being laid on 7 upper surface of soil sample and the coarse sands layer I 5 being laid on the geotextiles bed course I 6.In this reality
It applies in example, the sample loading cylinder body 8 is equipped with along its axial direction on the side wall of the sample loading cylinder body 8 using made of organic glass
The graduated scale of direction setting, is convenient for accurate sample preparation, convenient for observation experimental phenomena.Coarse sand is arranged from top to bottom in sample loading cylinder body 8
Layer I 5, geotextiles bed course I 6, soil sample 7, geotextiles bed course II 9, coarse sands layer II 10 and permeable disk 11, wherein using coarse sands layer I 5,
Geotextiles bed course I 6, geotextiles bed course II 9 and coarse sands layer II 10 are for the ease of the uniform seepage flow of liquid, and permeable disk 11 uses needle
Shape hole, can make negative pressure uniformly act on soil sample, not influence the percolation path of liquid.
Negative pressure drawing liquid part includes sequentially connected vacuum fluid reservoir 14, vacuumizes tank 21 and vacuum pump 15, in institute
The bottom for stating vacuum fluid reservoir 14 is equipped with pumping inlet and leakage fluid dram, and IV 14-1 of valve is equipped on the pumping inlet,
V 14-2 of valve is equipped on the leakage fluid dram, the pumping inlet is connect with the liquid outlet, in the vacuum fluid reservoir
14 top be equipped with vacuum meter I 18 and vacuum orifice, on the vacuum orifice be equipped with VI 14-3 of valve, the vacuum orifice and
The top for vacuumizing tank 21 is connected by communicating pipe 17, and pressure regulator valve 16 is equipped on the communicating pipe 17, is taken out very described
The top of slack tank 21 is equipped with electric contact vacuum meter 19, and the electric contact vacuum meter 19 controls startup and the pass of the vacuum pump 15
It closes.In the present embodiment, it in order to easily know the vacuum values vacuumized in tank 21, is equipped at the top for vacuumizing tank 21
Vacuum meter II 20.In the present invention, vacuum fluid reservoir 14 is both the safe storage of source of stable pressure and cementitious test sand column efflux
Room.The effect of electric contact vacuum meter 19 is to ensure that vacuumizing tank 21 supplies sufficient vacuum degree.
The test method uses following steps：
1) voltage stabilizing is set
In the case where 14 air-tightness of vacuum fluid reservoir is intact, VI 14-3 of the valve is opened, the valve is closed
V 14-2 of IV 14-1 and the valve, then sets the upper lower limit value of the electric contact vacuum meter 19, then starts the vacuum
Pump 15 makes the negative pressure value in the vacuum fluid reservoir 14 stabilize to saturation soil sample default then by adjusting the pressure regulator valve 16
The lower limiting value of negative pressure value, the electric contact vacuum meter 19 is more than the saturation soil sample preset negative pressure value；
2) soil sample is installed
The lower cover 13 is tightened, the permeable disk 11 is packed into the sample loading cylinder body 8, is spread in the upper surface of described permeable disk 11
If the coarse sands layer II 10 and the geotextiles bed course II 9, vaseline is smeared in 8 inside of the sample loading cylinder body, is wanted according to experiment
Native sample compacting to design height is laid with geotextiles bed course I 6, in the geotechnique by the soil sample parameter layering asked in the soil sample
Coarse sands layer I 5 is laid on cloth bed course I 6, the soil sample installs, the upper cover 4 is tightened；
3) it is saturated soil sample
3.1) height for adjusting the supplying bottle 2, makes it higher than the cementitious test sand column, closes the valve I 4-2,
Then enough tap water are packed into the supplying bottle 2；
3.2) III 13-1 of valve and IV 14-1 of the valve is opened, II 4-3 of the valve is closed, waits for the vacuum storage
When negative pressure in flow container 14 is stablized again to saturation soil sample preset negative pressure value, open the valve I 4-2, tap water in gravity and
The soil sample is penetrated under the action of negative pressure, and finally flows into the vacuum fluid reservoir 14；
3.3) when finding to have water to enter the vacuum fluid reservoir 14, the soil sample saturation finishes, record saturation soil sample institute
With the volume of tap water, it is denoted as saturation soil sample water consumption；
4) negative pressure value and the relationship into flow velocity are established, determines cementing negative pressure value
4.1) II 4-3 of valve is opened, so that I 5 top of the coarse sands layer is accumulated the water column of 3~5cm, closes the valve
I 4-2 oozes the time t of 2cm water columns needs under measurement, obtain lower seepage flow speed v, v=2cm* sand cylinder floor space/t；
4.2) upper lower limit value of the electric contact vacuum meter 19 is adjusted, and by adjusting the pressure regulator valve 16, is made described true
Negative pressure value in empty fluid reservoir 14 stabilizes to a certain default negative pressure value, then opens the valve I 4-2, repeats step 4.1)；
4.3) repeatedly circulating repetition step 4.2), record preset negative pressure value and corresponding lower seepage flow speed, and draw pre-
If oozing current curve under negative pressure value-, the negative pressure value under test requirements document corresponding to seepage flow speed is found as cementing negative pressure value；It will experiment
It is required that lower seepage flow speed is used as flow velocity；
5) cementing preparation
Close II 4-3 of the valve；Negative pressure value in vacuum fluid reservoir 14 is adjusted to the cementing negative pressure determined to step 4)
Value；The tap water being vented in supplying bottle 2, prepares enough bacterium solutions and consolidating fluid.
6) bacterium is noted
Bacterium solution is put into the supplying bottle 2, open the valve I 4-2 and controls its aperture, so that bacterium solution is entered described cementing
The flow velocity for testing sand column is identical as the lower seepage flow speed of test requirements document, satisfies when the bacterium solution volume for entering the cementitious test sand column is more than
When with soil sample water consumption, III 13-1 of the valve I 4-2 and the valve is closed, bacterium solution is made to stand a setting in the soil sample
After duration, VI 14-3 of the valve is closed, opens V 14-2 of the valve, cleans out the liquid in the vacuum fluid reservoir 14；
It is then shut off V 14-2 of the valve, opens VI 14-3 of the valve, the negative pressure in the vacuum fluid reservoir 14 is made to stablize again
For cementing negative pressure value.
7) consolidating fluid is noted
7.1) consolidating fluid is put into the supplying bottle 2, opens III 13-1 of the valve I 4-2 and the valve, described in control
The aperture of valve I 4-2 keeps the flow velocity that consolidating fluid enters the cementitious test sand column identical as the lower seepage flow speed of test requirements document, when
Consolidating fluid enters the volume of the cementitious test sand column with when bacterium solution volume used is equal in step 6), closes the valve I 4-2
With III 13-1 of the valve, consolidating fluid is made to stand a setting duration in soil；VI 14-3 of the valve is closed, the valve is opened
V 14-2 cleans out the liquid in the vacuum fluid reservoir 14；It is then shut off V 14-2 of the valve, opens the valve VI
14-3 makes the negative pressure in the vacuum fluid reservoir 14 stabilize to cementing negative pressure value again；
7.2) step 7.1) is repeated 3-5 times；
8) circulating repetition step 6)~7) at least 1 time, in circulating repetition step 6)~7) before, open the valve III
13-1, it is cementing to finish.
After the test, it turns off the power switch, opens II 4-3 of valve, V 14-2 of valve at leisure, make cementitious test sand column
Interior air pressure restores to atmospheric pressure, then opens the upper cover 4 of sample loading cylinder body 8 and lower cover 13, removes permeable disk 11 and annular
The soil sample cemented is released with sample equipment is hit, clears up experimental rig by holder 12 at leisure.
The present invention can adjust the negative pressure of vacuum of setting, be not limited to the cementing of fine grained soil, simultaneously according to actual tests object
The size of the cementing device of negative pressure can be changed according to test objective, test procedure is not limited to embodiment of above.
Although the preferred embodiment of the present invention is described above in conjunction with attached drawing, the invention is not limited in upper
The specific implementation mode stated, the above mentioned embodiment is only schematical, be not it is restrictive, this field it is common
Technical staff under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, may be used also
By make it is many in the form of, within these are all belonged to the scope of protection of the present invention.
Claims (5)
1. the test method of the cementing fine grained soil of microorganism under a kind of negative pressure, which is characterized in that the test method is cured using negative pressure
Device is completed, and the negative pressure solidification equipment includes feed flow part, cementation solidifying part and negative pressure drawing liquid part；
The feed flow part includes adjustable for height supplying bottle；
The cementation solidifying part includes cementitious test sand column, and the cementitious test sand column includes sample loading cylinder body and sealed with it solid
The upper cover and lower cover connect is equipped with the liquid inlet and air inlet being connect with the supplying bottle, in the liquid inlet on the cover
It is equipped with valve I, valve II is equipped on the air inlet, liquid outlet is equipped on the lower lid, is set on the liquid outlet
There is valve III, is equipped with permeable disk in the lower part of the sample loading cylinder body, multiple uniformly distributed acicular pores, institute are equipped on the permeable disk
It states permeable disk to be supported on the lower lid by ring support, coarse sands layer II is equipped on the permeable disk, in the coarse sands layer
It is equipped with geotextiles bed course II on II, I He of geotextiles bed course being laid on soil sample upper surface is equipped in the sample loading cylinder body
The coarse sands layer I being laid on the geotextiles bed course I；
Negative pressure drawing liquid part includes sequentially connected vacuum fluid reservoir, vacuumizes tank and vacuum pump, in the vacuum liquid storage
The bottom of tank is equipped with pumping inlet and leakage fluid dram, and valve IV is equipped on the pumping inlet, is set on the leakage fluid dram
There are valve V, the pumping inlet to be connect with the liquid outlet, vacuum meter I is equipped at the top of the vacuum fluid reservoir and takes out
Vacuum port is equipped with valve VI on the vacuum orifice, and the vacuum orifice and described vacuumize pass through communicating pipe at the top of tank
Connection is equipped with pressure regulator valve on the communicating pipe, and electric contact vacuum meter, the electric contact are equipped at the top for vacuumizing tank
Vacuum meter controls the startup and closing of the vacuum pump；
The test method uses following steps：
1) voltage stabilizing is set
In the case where the vacuum fluid reservoir air-tightness is intact, the valve VI is opened, the valve IV and the valve are closed
Door V, then sets the upper lower limit value of the electric contact vacuum meter, then starts the vacuum pump, then by adjusting the tune
Pressure valve makes the negative pressure value in the vacuum fluid reservoir stabilize to and is saturated soil sample preset negative pressure value, under the electric contact vacuum meter
Limit value is more than the saturation soil sample preset negative pressure value；
2) soil sample is installed
The lower cover is tightened, the permeable disk is packed into the sample loading cylinder body, the coarse sand is laid in the upper surface of described permeable disk
Layer II and the geotextiles bed course II, vaseline is smeared in side in the sample loading cylinder body, according to the soil sample parameter point of test requirements document
Native sample compacting to design height is laid with geotextiles bed course I by layer in the soil sample, is laid on the geotextiles bed course I thick
Layer of sand I, the soil sample install, and the upper cover is tightened；
3) it is saturated soil sample
3.1) height for adjusting the supplying bottle, makes it higher than the cementitious test sand column, closes the valve I, then in institute
It states and is packed into enough tap water in supplying bottle；
3.2) valve III and the valve IV are opened, the valve II is closed, waits for negative pressure in the vacuum fluid reservoir again
When secondary stabilization to saturation soil sample preset negative pressure value, the valve I is opened, described in tap water penetrates under the action of gravity and negative pressure
Soil sample, and finally flow into the vacuum fluid reservoir；
3.3) when finding to have water to enter the vacuum fluid reservoir, the soil sample saturation finishes, used in record saturation soil sample originally
The volume of water is denoted as saturation soil sample water consumption；
4) negative pressure value and the relationship into flow velocity are established, determines cementing negative pressure value
4.1) valve II is opened, so that I top of the coarse sands layer is accumulated the water column of 3~5cm, the valve I is closed, under measurement
The time t of 2cm water columns needs is oozed, lower seepage flow speed v, v=2cm* sand cylinder floor space/t is obtained；
4.2) upper lower limit value of the electric contact vacuum meter is adjusted, and by adjusting the pressure regulator valve, makes the vacuum fluid reservoir
Interior negative pressure value stabilizes to a certain default negative pressure value, then opens the valve I, repeats step 4.1)；
4.3) multiple circulating repetition step 4.2) records and presets negative pressure value and corresponding lower seepage flow speed, and draws preset negative
Current curve is oozed under pressure value-, finds the negative pressure value under test requirements document corresponding to seepage flow speed as cementing negative pressure value；By test requirements document
Lower seepage flow speed is used as flow velocity；
5) cementing preparation
Close the valve II；Negative pressure value in vacuum fluid reservoir is adjusted to the cementing negative pressure value determined to step 4)；Emptying supplies
Tap water in liquid bottle prepares enough bacterium solutions and consolidating fluid；
6) bacterium is noted
Bacterium solution is put into the supplying bottle, open the valve I and controls its aperture, bacterium solution is made to enter the cementitious test sand column
Flow velocity it is identical as the lower seepage flow speed of test requirements document, when enter the cementitious test sand column bacterium solution volume be more than saturation soil sample use
When water, the valve I and the valve III are closed, after so that bacterium solution is stood a setting duration in the soil sample, described in closing
Valve VI opens the valve V, cleans out the liquid in the vacuum fluid reservoir；It is then shut off the valve V, opens institute
Valve VI is stated, the negative pressure in the vacuum fluid reservoir is made to stabilize to cementing negative pressure value again；
7) consolidating fluid is noted
7.1) consolidating fluid is put into the supplying bottle, opens the valve I and the valve III, control the aperture of the valve I,
Keep the flow velocity that consolidating fluid enters the cementitious test sand column identical as the lower seepage flow speed of test requirements document, when consolidating fluid enters the glue
The volume of knot experiment sand column is closed the valve I and the valve III, is made cementing with when bacterium solution volume used is equal in step 6)
Liquid stands a setting duration in soil；The valve VI is closed, the valve V is opened, is cleaned out in the vacuum fluid reservoir
Liquid；It is then shut off the valve V, opens the valve VI, so that the negative pressure in the vacuum fluid reservoir is stabilized to again cementing
Negative pressure value；
7.2) step 7.1) is repeated 3-5 times；
8) circulating repetition step 6)~7) at least 1 time, in circulating repetition step 6)~7) before, the valve III is opened, it is cementing
It finishes.
2. the test method of the cementing fine grained soil of microorganism under negative pressure according to claim 1, which is characterized in that the feed flow
Part includes a bottle stand, and there are two the supplying bottles, and two supplying bottles are used made of organic glass, in the feed flow
The side wall of bottle is equipped with the graduated scale being arranged along its axial direction, and two supplying bottles respectively hang over the bottle stand by a lifting rope
On, the lifting rope pile warp fixed pulley is simultaneously wrapped on reel, and the reel and the pulley are installed on the bottle stand, in institute
It states reel and is equipped with rocking handle, rocking handle fixed structure is equipped on the bottle stand；The liquid inlet be two and with two confessions
Liquid bottle corresponds.
3. the test method of the cementing fine grained soil of microorganism under negative pressure according to claim 1, which is characterized in that in the pumping
The top of vacuum tank is equipped with vacuum meter II.
4. the test method of the cementing fine grained soil of microorganism under negative pressure according to claim 1, which is characterized in that the valve
I, the valve II, the valve III, the valve IV, the valve V and the valve VI are all made of plug valve.
5. the test method of the cementing fine grained soil of microorganism under negative pressure according to claim 1, which is characterized in that the dress sample
Cylinder is that the graduated scale being arranged along its axial direction is equipped on the side wall of the sample loading cylinder body using made of organic glass.
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| CN107271636B (en) * | 2017-06-19 | 2019-06-21 | 南华大学 | A kind of experimental rig and application method for reinforcing sand for microorganism |
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| CN108761044B (en) * | 2018-08-13 | 2023-06-20 | 重庆科技学院 | Test device and method for microorganism-induced calcium carbonate precipitation solidification sand under negative pressure environment |
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| CN109708941A (en) * | 2019-02-01 | 2019-05-03 | 贵州大学 | A kind of experimental rig and its test method solidifying the soil body for microorganism |
| CN110331714A (en) * | 2019-06-18 | 2019-10-15 | 广东工业大学 | A kind of microorganism sand column provisions for grouting and grouting method |
| CN117965292A (en) * | 2024-04-02 | 2024-05-03 | 广州大学 | Soil pressurizing grouting experimental device and experimental method thereof |
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| CN204898658U (en) * | 2015-06-24 | 2015-12-23 | 商丘工学院 | Be used for consolidating little biological glue knot sand pile of soft soil foundation |
| CN105297705A (en) * | 2015-10-14 | 2016-02-03 | 内蒙古工业大学 | Biological sandstone preparation method and device based on MICP (Microbial Induced Carbonate Precipitation) technology |
| CN105424438B (en) * | 2015-12-04 | 2018-06-19 | 浙江科技学院 | Needle enters the uniform curing sand sample preparation device of microorganism and its method for making sample of formula |
| CN105507232B (en) * | 2015-12-08 | 2017-06-16 | 南京林业大学 | A kind of microorganism flat board grouting device and method for reinforcing Liquefaction Foundation |
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| CN105649003A (en) * | 2016-01-11 | 2016-06-08 | 河海大学 | Reinforcing device for reinforcing sand foundation through combination of microorganisms with vacuum drainage and reinforcing method of reinforcing device |
| CN105714765B (en) * | 2016-02-01 | 2017-08-25 | 南京林业大学 | A kind of solid indigenous method of microorganism low-temperature slip casting |
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