CN109342135A - A kind of laboratory testing rig and method of the uniform curing clay of microorganism - Google Patents
A kind of laboratory testing rig and method of the uniform curing clay of microorganism Download PDFInfo
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- CN109342135A CN109342135A CN201811160392.2A CN201811160392A CN109342135A CN 109342135 A CN109342135 A CN 109342135A CN 201811160392 A CN201811160392 A CN 201811160392A CN 109342135 A CN109342135 A CN 109342135A
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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
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of laboratory testing rigs and method based on the uniform curing clay of microbial technique, belong to field of foundation treatment.The device includes power head, stirring rod connector, stirring rod, stirring-head, mudjack, feed pipe for mortar, moveable small-sized hydraulic lifting support and the model casing for placing clay sample；Stirring rod upper end is connect by stirring rod connector with power head, and lower end connects stirring-head；Power head is fixed on moveable lifting support；The channel of MICP slurries is equipped with inside stirring rod connector, stirring rod and stirring-head.This method is based on above-mentioned apparatus, is stirred by stirring-head to clay, and carries out MICP grouting using mudjack simultaneously.The present invention rapidly and uniformly can carry out consolidation process to clay, improve the integral strength of clay to a certain extent, solidify the application of clay technology in practical projects for microorganism and provide reference frame.
Description
Technical field
The invention belongs to field of foundation treatment, and MICP technology is applied to processing clay more particularly, to a kind of, thus
Carry out the laboratory testing rig and method of the uniform curing clay test of microorganism.
Background technique
Microorganism solidifies (Microbially Induced Calcite Precipitation, abbreviation MICP) technology, is
Recently a kind of emerging foundation treatment technology is decomposed using the urase catalyzing urea in bacterium and generates CO3 2-, and then and Ca2+In conjunction with
Calcium carbonate is generated, plays certain cementation, to soil body particle to improve soil body mechanical property.Whole process is pollution-free, energy
It consumes low, and reinforces high-efficient, receive extensive research.
In the application of current geotechnical engineering, the main effective object of MICP technology is loosening sand.Sand has biggish hole
Gap volume, good penetrability, bacterial solution and consolidating fluid (urea and CaCl2Mixed liquor) can equably to sand sample carry out
Processing, the sand after MICP technical treatment have biggish improvement in a series of physical mechanical property such as intensity, rigidity.
The pore volume of clay is small, and permeability is very poor, and common grouting operation can only be handled to the surface layer soil body, and slurries can not
The internal soil body is handled, therefore the effect of MICP technical treatment clay is poor, lacks suitable test method.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of uniform curing clays of microorganism
Experimental Method in Laboratory and its device, it is intended that by configuring moveable agitating device, in conjunction with self weight solidification and microorganism
Stirring, solves the problems, such as that microorganism curing process clay uniformity is poor in the prior art, is in the engineering of actual treatment clay
Reference frame is provided using MICP technology.
To achieve the goals above, the present invention provides a kind of laboratory tests based on the uniform curing clay of microbial technique
Device, comprising: power head, stirring rod connector, rotary joint, stirring rod, stirring-head, mudjack, feed pipe for mortar, mobile liftable
Bracket and the model casing for placing clay sample；
Power head is fixed on mobile liftable bracket, and stirring rod upper end is connected by stirring rod connector with power head
It connects, stirring rod lower end is connect with stirring-head；Stirring rod connector side wall is equipped with stock inlet, and stock inlet passes through feed pipe for mortar and mud jacking
Pump connection；
The channel for slurries flowing is equipped in stirring rod connector, stirring rod and stirring-head；Stirring-head lower part is equipped with and stirs
Blade and mouth spray are mixed, stock inlet is connected with the slurry channels of stirring rod upper end by rotary joint.
Further, stirring rod connector is divide into upper part and lower part, and top split-phase is fixed for power head, stock inlet
Side wall positioned at upper part；Lower half portion can be rotated relative to top half, and the upper end of lower half portion connects power head, lower end
The upper end of stirring rod is connected, and is located at the access portal of stirring rod upper end inside lower half portion；Make the channel of stirring rod upper end
Opening is connect with stock inlet by rotary joint.
It further, further include at least one stirring extension rod；Stirring extension rod is stirred for connecting stirring rod and stirring-head
The channel for being equipped with inside extension rod and flowing for slurries is mixed, is connected to the channel in stirring rod and stirring-head.
Further, mobile liftable bracket is hydraulic lifting frame, and bottom is equipped with universal wheel, it is preferable that universal wheel tool
There is self-locking structure.
Further, stirring-head lower part is equipped with multiple groups stirring blade, and stirring blade and the be in angle of horizontal direction be 20 °~
30°。
Further, it shares three groups of stirring blades to be from top to bottom arranged around on stirring-head, every group of two stirring blades,
It is symmetrically distributed in stirring-head axis two sides.
Further, mouth spray is located near the stirring blade of middle layer.
It further, further include controller；Power head, mudjack, lifting support are electrically connected with the controller respectively, controller
For controlling the lifting speed and height of the revolving speed of power head, the pressure of mudjack, the lifting support.
To achieve the goals above, the present invention also provides carry out uniform curing test based on above-mentioned laboratory testing rig
Method, method includes the following steps:
(1) clay to be processed is inserted in model casing, when filling is to predetermined altitude, soil body surface is smoothed out, is stood,
Consolidate clay to be processed sufficiently under Gravitative Loads；
(2) according to the maximum processing depth of clay to be processed, stirring pole length is adjusted, the installation of stirring-head (5) is completed；
(3) height and the horizontal position for adjusting stirring-head, are placed exactly in it above point to be processed；
(4) prepare enough MICP slurries, and connect mudjack and stock inlet；
(5) power head and mudjack are opened, and controls lifting support and is declined with scheduled rate, is stirred slip casting；When stirring
When mixing head and being down to maximum processing depth, motivation of adjustment head reversely rotates stirring-head, when adjusting lifting support with according to decline
Phase same rate rise, be stirred slip casting；
(6) after head to be mixed completes mixing-filling operation one on the other, power head and mudjack are closed, passes through lifting branch
Stirring-head is moved to above next point to be processed by frame, repeats step (5) until all stirring is completed.
Further, MICP slurries are by bacterial solution, urea and CaCl2Solution mixes composition in equal volume；Bacterial solution
OD600Between 0.5~2, urea concentration is between 0.5~2mol/L, CaCl2Solution concentration 0.5~2mol/L it
Between.
In general, the above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial to effect
Fruit:
(1) action of forced stirring is carried out by the soil body to injection MICP slurries, so that grout distribution is more uniform, subsequent micro- life
Object solidification process is also more uniform, conducive to the improvement of soil strength；
(2) during stirring-head one is next upper, mixing-filling operation twice is just completed, is carried out without waiting for slurries
Infiltration, efficiency are higher；
(3) slip casting, the soil body that can be poor to common grouting operation permeability difficult to deal with are carried out by the stirring soil body
Carry out microorganism curing process, strong applicability；
(4) the device of the invention can reuse.
Detailed description of the invention
Fig. 1 is the laboratory testing rig overall structure diagram of the uniform curing clay of microorganism provided by the invention；
Fig. 2 is that stirring rod and stirring-head are put in the laboratory testing rig of the uniform curing clay of microorganism provided by the invention
Big structure front view；
Fig. 3 is that stirring rod and stirring-head are put in the laboratory testing rig of the uniform curing clay of microorganism provided by the invention
Big structure side view.
In all the appended drawings, identical appended drawing reference is used to denote the same element or structure, in which:
Power head 1, stirring rod connector 2, stirring rod 3, stirring extension rod 4, stirring-head 5, stirring blade 6, mudjack 7,
Feed pipe for mortar 8, moveable small-sized hydraulic lifting support 9, model casing 10, mouth spray 11, the stock inlet 12 for placing clay sample.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below
Not constituting a conflict with each other can be combined with each other.
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Fig. 1 shows the laboratory testing rig overall structure diagram of the uniform curing clay of microorganism provided by the invention；
Fig. 2 shows the amplification knots of stirring rod in the Experimental Method in Laboratory of the uniform curing clay of microorganism provided by the invention and stirring-head
Structure schematic diagram.As depicted in figs. 1 and 2, this specific embodiment provides the Experimental Method in Laboratory of the uniform curing clay of microorganism, whole
Covering device includes: power head 1, stirring rod connector 2, stirring rod 3, stirring extension rod 4, stirring-head 5, stirring blade 6, mudjack
7, feed pipe for mortar 8, moveable small-sized hydraulic lifting support 9 and the model casing 10 for placing clay sample, power head 1 are fixed on liter
On descending branch frame 9,3 upper end of stirring rod is connected by stirring rod connector 2 with power head, stirring 4 lower end of extension rod and stirring-head 5
It is connected, the stock inlet 12 of 2 upper side wall of stirring rod connector is connect by feed pipe for mortar 8 with mudjack 7, and stirring rod connector 2 stirs
The channel being equipped in bar 3, stirring extension rod 4 and stirring-head 5 for slurries flowing is mixed, 5 lower part of stirring-head is equipped with 6 He of stirring blade
Mouth spray 11.
Stirring rod connector 2 is divide into upper part and lower part, and upper partial interior is equipped with slurry channels, and stock inlet 12 is located at upper part
On side wall, slurry channels outlet is located at upper Partial joints bottom center, and is connected with the slurry channels of lower part stirring rod,
Under power head 1 acts on, partially it is remain stationary on stirring rod connector 2.The lower part of stirring rod connector 2 is connected with stirring rod 3,
Under the action of power head 1, stirring rod 3, stirring extension rod 4 and stirring-head 5 is driven to rotate together.
Fig. 2 shows stirring rod and stirring-heads in the laboratory testing rig of the uniform curing clay of microorganism provided by the invention
Enlarged structure schematic diagram.As shown in Fig. 2, stirring rod is divided into two kinds: stirring rod 3 and stirring extension rod 4.Wherein on stirring rod 3
Portion is enlarged footing, and enlarged footing side wall is equipped with several groove, and to connect stirring rod connector, while lower part is stirred by bolt and downside
Extension rod 4 is mixed to be connected；Stirring inside extension rod 4 is the slurry channels penetrated through, and slurry channels continue above enlarged footing
Extend, connects until with the slurry channels outlet of section bottom on stirring rod connector 2；It stirs built in extension rod 4 up and down
Slurry channels, in actual operation, can by increase stirring extension rod 4 quantity to improve processing depth, the bottom stirs
Extension rod 4 is mixed to be connected with stirring-head 5；Between stirring rod 3 and stirring extension rod 4, stir between extension rod 4 and stirring-head 5
It is bolted.
In total around 3 groups of stirring blades 6 are arranged on stirring-head 5, every group includes two pieces of blades, blade and horizontal direction institute
It is 20 °~30 ° in angle, is fixed with welding manner.3 groups of blades are equidistantly evenly distributed on stirring-head 5, wherein mouth spray 11
Near intermediate blade group, when stirring-head, which rotates, to be declined, top layer blade group is in time stirred the soil body for spraying into slurries；
When stirring-head 5, which rotates, to be risen, bottom blade group is in time stirred the soil body for spraying into slurries.
Mudjack 7, power head 1 and lifting support 9 are electrically connected with respective controller respectively.Pass through operation mudjack 7
Controller, regulation MICP slurries spray into the rate of the soil body；By controlling the controller of power head 1, setting stirring rod 3, stirring are prolonged
The speed of rotation and direction of rotation of stock 4 and stirring-head 5；By controlling the controller of lifting support 9, stirred before setting mixing-filling
Mix first 5 height and mixing-filling during stirring-head 5 decline climbing speed.
9 bottom of lifting support is equipped with universal wheel, can arbitrarily move horizontally, and then changes the horizontal position of stirring-head,
Under the premise of not changing model casing position, the mixing-filling for carrying out multiple and different positions to clay body to be processed is operated, and is improved
Improve the efficiency of soil capability.
Steps are as follows for main experimental of the invention:
(1) clay to be processed is fetched from scene and is put into model casing, to soil body arrival mode case height in model casing
When 2/3~3/4, soil body surface is smoothed out, clay to be processed is allowed at least to consolidate 30 days；
(2) according to the maximum processing depth of soil to be processed, appropriate number of stirring rod is selected to complete the connection of above-mentioned apparatus；
(3) height and the horizontal position for adjusting stirring-head, are placed exactly in it above point to be processed；
(4) MICP slurries are prepared, and connect mudjack, mudjack is set as lower pressure；The MICP slurries
By bacterial solution, urea liquid and CaCl2Solution mixes in equal volume.The OD of bacterial solution600Between 0.5~2, urea
Solution concentration is between 0.5~2mol/L, CaCl2Solution concentration is between 0.5~2mol/L；MICP slurries are being connected into mudjack
Before, low speed should be carried out to it uniformly to stir, with equably mixed cell bacterium solution, urea and CaCl2Solution prevents simultaneously
The layering of MICP slurries and the fast deposition of calcium carbonate avoid resulting in blockage to the pipeline of device and port etc.；
(5) power head and mudjack are opened, and controls lifting support and is declined with pre-set velocity, is stirred slip casting；When stirring
When mixing head and being down to maximum processing depth, motivation of adjustment head reversely rotates stirring-head, adjusts lifting support on phase same rate
It rises, is stirred slip casting；
(6) after head to be mixed completes mixing-filling operation one on the other, power head and mudjack are closed, passes through lifting branch
Stirring-head is moved to above next point to be processed by frame.
Implementation method of the invention is introduced below with reference to a concrete application:
(1) it takes in clay filling model casing to be processed, the height for inserting the soil body accounts for about model casing height 2/3, fills completion
Afterwards, floating processing is carried out to soil body sample surface, stands 30 day time, clay to be processed is allowed sufficiently to consolidate；
(2) appropriate number of stirring extension rod 4 is selected, blending bolt is attached stirring rod and stirring-head, in order to keep away
Exempt from slurries to leak in junction, sealant can be used, the place of being bolted is handled；
(3) stirring-head positions.Using the universal wheel of lifting support bottom, lifting support is horizontally moved, adjustment is stirred
The horizontal position of head is mixed, is reached right above sample point to be processed；Adjust lifting support height so that stirring-head bottom just with
Glutinous soil body surface to be processed is in contact；
(4) MICP slurries are prepared, mudjack is connected.Mudjack is opened simultaneously, sets lower pressure value for MICP slurries
It is pumped into agitating device (stirring rod connector, stirring rod and stirring-head) by feed pipe for mortar, empties MICP slurry channels in device
Interior all gas；MICP slurries are by bacterial solution, urea, CaCl2Solution mixes.Bacterial solution concentration is with OD600It is worth table
Show, value is taken as 1.0, guarantees enough bacterial numbers；Urea concentration is 1.5mol/L；CaCl2Concentration is 2mol/L.
(5) mixing-filling.When the mouth spray on stirring-head has liquid outflow, starting power head drives stirring-head and stirring
Bar is rotated clockwise with pre-set velocity；The pressure value of mudjack is increased into preset value, improves the flow velocity of MICP slurries；Setting rises
The controller control lifting support of descending branch frame is declined with pre-set velocity.As stirring-head is transferred to the soil body, MICP slurries pass through whitewashing
Mouth is injected in clay to be processed, while being located at one group of stirring blade above mouth spray can be immediately to the soil for spraying into MICP slurries
Body carries out cutting stirring, guarantees the uniformity of MICP grout distribution.After stirring-head drops to scheduled processing depth, by setting
The controller of determined power head, controls stirring rod and stirring-head is rotated counterclockwise with identical speed；Pass through setting lifting support
Controller, control power head are risen with identical speed.With stirring-head rotate rise, MICP slurries by mouth spray constantly to
MICP slurries are sprayed into clay to be processed, one group of stirring blade below mouth spray can immediately to spray into the soil bodys of slurries into
Row cutting stirring, promotes the uniformity of grout distribution.When stirring-head, which rises to, to be detached from the soil body, mudjack and power head are closed
And stop the rising of lifting support, to treated, soil body surface carries out floating processing, so as to complete a mixing-filling；
(6) stirring-head is moved to next soil body point to be processed, repeats above-mentioned behaviour by the universal wheel for utilizing lifting device
Make, until complete institute point to be handled mixing-filling operate.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of laboratory testing rig based on the uniform curing clay of microbial technique characterized by comprising power head (1),
Stirring rod connector (2), rotary joint, stirring rod (3), stirring-head (5), mudjack (7), feed pipe for mortar (8), mobile liftable branch
Frame (9) and the model casing (10) for placing clay sample；
Power head (1) is fixed on mobile liftable bracket (9), and stirring rod (3) upper end passes through stirring rod connector (2) and power
Head (1) is connected, and stirring rod (3) lower end is connect with stirring-head (5)；Stirring rod connector (2) side wall is equipped with stock inlet (12),
Stock inlet (12) is connect by feed pipe for mortar (8) with mudjack (7)；
The channel for slurries flowing is equipped in stirring rod connector (2), stirring rod (3) and stirring-head (5)；Under stirring-head (5)
Portion is equipped with stirring blade (6) and mouth spray (11), and the slurry channels of stock inlet (12) and stirring rod (3) upper end pass through rotary joint
Connection.
2. a kind of laboratory testing rig based on the uniform curing clay of microbial technique as described in claim 1, feature exist
In stirring rod connector (2) is divide into upper part and lower part, and top split-phase is fixed for power head (1), and stock inlet (12) is located at
The side wall of upper part；Lower half portion can be rotated relative to top half, and the upper end of lower half portion connects power head (1), lower end
The upper end of stirring rod (3) is connected, and is located at the access portal of stirring rod (3) upper end inside lower half portion；Make on stirring rod (3)
The access portal at end is connect with stock inlet (12) by rotary joint.
3. a kind of laboratory testing rig based on the uniform curing clay of microbial technique as claimed in claim 1 or 2, feature
It is, further includes at least one stirring extension rod (4)；Stirring extension rod (4) is stirred for connecting stirring rod (3) and stirring-head (5)
The channel for being equipped with inside extension rod (4) and flowing for slurries is mixed, is connected to the channel in stirring rod (3) and stirring-head (5).
4. a kind of laboratory test dress based on the uniform curing clay of microbial technique as described in claims 1 to 3 any one
It sets, which is characterized in that mobile liftable bracket (9) is hydraulic lifting frame, and bottom is equipped with universal wheel, it is preferable that universal wheel tool
There is self-locking structure.
5. a kind of laboratory test dress based on the uniform curing clay of microbial technique as described in Claims 1 to 4 any one
It sets, which is characterized in that stirring-head (5) lower part is equipped with multiple groups stirring blade (6), stirring blade (6) and the be in angle of horizontal direction
It is 20 °~30 °.
6. a kind of laboratory testing rig based on the uniform curing clay of microbial technique as claimed in claim 5, feature exist
In, it shares three groups of stirring blades (6) and is from top to bottom arranged around on stirring-head (5), every group of two stirring blades (6), symmetrically
It is distributed in stirring-head (5) axis two sides.
7. a kind of laboratory testing rig based on the uniform curing clay of microbial technique as claimed in claim 6, feature exist
In mouth spray (11) is located near the stirring blade (6) of middle layer.
8. a kind of laboratory test dress based on the uniform curing clay of microbial technique as described in claim 1~7 any one
It sets, which is characterized in that further include controller；Power head (1), mudjack (7), lifting support (9) are electrically connected with the controller respectively,
Controller is used to control the lifting speed and height of the revolving speed of power head (1), the pressure of mudjack (7), the lifting support (9)
Degree.
9. based on the method that laboratory testing rig described in Claims 1 to 5 any one carries out uniform curing test, feature
It is, method includes the following steps:
(1) by clay to be processed filling model casing (10), when filling is to predetermined altitude, soil body surface is smoothed out, is stood,
Consolidate clay to be processed sufficiently under Gravitative Loads；
(2) according to the maximum processing depth of clay to be processed, stirring pole length is adjusted, the installation of stirring-head (5) is completed；
(3) height and the horizontal position for adjusting stirring-head (5), are placed exactly in it above point to be processed；
(4) prepare enough MICP slurries, and connect mudjack (7) and stock inlet (12)；
(5) power head (1) and mudjack (7) are opened, and controls lifting support (9) and is declined with scheduled rate, is stirred slip casting；
When stirring-head (5) is down to maximum processing depth, motivation of adjustment head (1) reversely rotates stirring-head (5), adjusts lifting support
(9) with according to decline phase same rate when rises, and is stirred slip casting；
(6) after head (5) to be mixed completes mixing-filling operation one on the other, power head and mudjack are closed, passes through lifting branch
Stirring-head is moved to above next point to be processed by frame, repeats step (5) until all stirring is completed.
10. method as claimed in claim 9, which is characterized in that MICP slurries are by bacterial solution, urea and CaCl2 solution etc.
Volume mixture composition；The OD of bacterial solution600Between 0.5~2, urea concentration is between 0.5~2mol/L, CaCl2It is molten
Liquid concentration is between 0.5~2mol/L.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110438975A (en) * | 2019-07-23 | 2019-11-12 | 河海大学 | A kind of microorganism grouting device and construction method for reinforcing deep soft clay |
| CN112813961A (en) * | 2021-01-13 | 2021-05-18 | 大连理工大学 | Layered double-channel underground grouting structure and method |
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| CN107840555A (en) * | 2017-12-21 | 2018-03-27 | 广东胜隆汉华实业有限公司 | A kind of mud dystopy curing process device and method |
| CN108220196A (en) * | 2018-01-10 | 2018-06-29 | 南京林业大学 | A kind of method that microbial composite bacteria group handles oil pollution clay ground |
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| CN110438975A (en) * | 2019-07-23 | 2019-11-12 | 河海大学 | A kind of microorganism grouting device and construction method for reinforcing deep soft clay |
| CN110438975B (en) * | 2019-07-23 | 2021-09-17 | 河海大学 | Microbial grouting device for reinforcing deep soft clay and construction method |
| CN112813961A (en) * | 2021-01-13 | 2021-05-18 | 大连理工大学 | Layered double-channel underground grouting structure and method |
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