CN109342135B - Indoor testing device and method for uniformly solidifying clay by microorganisms - Google Patents
Indoor testing device and method for uniformly solidifying clay by microorganisms Download PDFInfo
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- CN109342135B CN109342135B CN201811160392.2A CN201811160392A CN109342135B CN 109342135 B CN109342135 B CN 109342135B CN 201811160392 A CN201811160392 A CN 201811160392A CN 109342135 B CN109342135 B CN 109342135B
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Abstract
The invention discloses an indoor test device and method for uniformly curing clay based on a microbial technology, and belongs to the field of foundation treatment. The device comprises a power head, a stirring rod connector, a stirring rod, a stirring head, a mud jacking pump, a mud conveying pipe, a movable small hydraulic lifting support and a model box for placing clay samples; the upper end of the stirring rod is connected with the power head through a stirring rod connector, and the lower end of the stirring rod is connected with a stirring head; the power head is fixed on the movable lifting bracket; and the inside of the stirring rod connector, the stirring rod and the stirring head are all provided with a channel of MICP slurry. The method is based on the device, the clay is stirred through the stirring head, and meanwhile, the MICP grouting is carried out through the grouting pump. The method can quickly and uniformly reinforce the clay, improves the overall strength of the clay to a certain extent, and provides a reference basis for the application of a microorganism clay curing technology in practical engineering.
Description
Technical Field
The invention belongs to the field of foundation treatment, and particularly relates to an indoor test device and method for applying an MICP technology to clay treatment so as to perform a clay test for uniformly solidifying microorganisms.
Background
The microorganism solidification (MICP) technology is a new foundation treatment technology recently developed, and the urease in the bacteria is utilized to catalyze the decomposition of urea to generate CO3 2-Further react with Ca2+Combines to generate calcium carbonate, and plays a role in treating soil particlesThe cementing function is determined so as to improve the mechanical property of the soil body. The whole process has no pollution, low energy consumption and high reinforcement efficiency, and is widely researched.
In current geotechnical engineering applications, the main target of MICP technology is loose sandy soil. The sand has large pore volume, good permeability, and bacterial liquid and cementing liquid (urea and CaCl)2The mixed liquid) can uniformly treat the sandy soil sample, and the sandy soil treated by the MICP technology has a series of physical and mechanical properties such as strength, rigidity and the like.
The clay has small pore volume and extremely poor permeability, the surface soil body can only be treated by common grouting operation, and the inner soil body cannot be treated by slurry, so the clay treatment effect of the MICP technology is poor, and a proper test method is lacked.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides an indoor test method and device for uniformly solidifying clay by microorganisms, aiming at solving the problem of poor uniformity of clay treated by microorganism solidification in the prior art by configuring a movable stirring device and combining dead weight solidification and microorganism stirring, and providing a reference basis for applying MICP technology in the engineering of actually treating clay.
In order to achieve the above object, the present invention provides an indoor testing apparatus for uniformly curing clay based on a microbiological technique, comprising: the device comprises a power head, a stirring rod connector, a rotary joint, a stirring rod, a stirring head, a mud jacking pump, a mud conveying pipe, a movable lifting support and a model box for placing clay samples;
the power head is fixed on the movable lifting support, the upper end of the stirring rod is connected with the power head through a stirring rod connector, and the lower end of the stirring rod is connected with the stirring head; a slurry inlet is arranged on the side wall of the stirring rod connector and is connected with a slurry pressing pump through a slurry conveying pipe;
the stirring rod connector, the stirring rod and the stirring head are all internally provided with channels for slurry to flow; the lower part of the stirring head is provided with a stirring blade and a slurry spraying port, and the slurry inlet is connected with a slurry channel at the upper end of the stirring rod through a rotary joint.
Furthermore, the stirring rod connector is divided into an upper part and a lower part, the upper part is fixed relative to the power head, and the slurry inlet is positioned on the side wall of the upper part; the lower half part can rotate relative to the upper half part, the upper end of the lower half part is connected with the power head, the lower end of the lower half part is connected with the upper end of the stirring rod, and a channel opening at the upper end of the stirring rod is positioned in the lower half part; the channel opening at the upper end of the stirring rod is connected with the slurry inlet through a rotary joint.
Further, the stirring device also comprises at least one stirring extension rod; the stirring extension rod is used for connecting the stirring rod and the stirring head, and a channel for slurry to flow is arranged inside the stirring extension rod and is communicated with the channel in the stirring rod and the stirring head.
Further, the movable lifting support is a hydraulic lifting frame, the bottom of the movable lifting support is provided with a universal wheel, and preferably, the universal wheel has a self-locking structure.
Furthermore, the lower part of the stirring head is provided with a plurality of groups of stirring blades, and the included angle formed between each stirring blade and the horizontal direction is 20-30 degrees.
Furthermore, three groups of stirring blades are arranged on the stirring head in a surrounding manner from top to bottom, and two stirring blades in each group are symmetrically distributed on two sides of the axis of the stirring head.
Further, the spouting port is located near the stirring vanes of the intermediate layer.
Further, the device also comprises a controller; the power head, the grouting pump and the lifting support are respectively and electrically connected with a controller, and the controller is used for controlling the rotating speed of the power head, the pressure of the grouting pump and the lifting speed and height of the lifting support.
In order to achieve the above object, the present invention also provides a method for performing a uniform curing test based on the above indoor test apparatus, the method comprising the steps of:
(1) filling the clay to be treated into a model box, and when the clay to be treated is filled to a preset height, leveling and standing the surface of a soil body to fully solidify the clay to be treated under the action of self weight;
(2) adjusting the length of the stirring rod according to the maximum treatment depth of the clay to be treated, and completing the installation of the stirring head (5);
(3) adjusting the height and the horizontal position of the stirring head to ensure that the stirring head is just above the point to be treated;
(4) preparing sufficient MICP slurry, and connecting a slurry pressing pump and a slurry inlet;
(5) opening the power head and a grouting pump, controlling the lifting support to descend at a preset speed, and stirring and grouting; when the stirring head descends to the maximum treatment depth, adjusting the power head to enable the stirring head to rotate reversely, adjusting the lifting support to ascend at the same speed when descending, and stirring and grouting;
(6) and (5) after the stirring head finishes the one-over-one stirring and grouting operation, closing the power head and the grouting pump, moving the stirring head to the position above the next point to be processed through the lifting support, and repeating the step (5) until all stirring is finished.
Further, the MICP slurry is prepared from bacterial liquid, urea and CaCl2Mixing the solutions in equal volumes; OD of bacterial liquid6000.5-2, the concentration of the urea solution is 0.5-2 mol/L, CaCl2The concentration of the solution is between 0.5 and 2 mol/L.
In general, compared with the prior art, the above technical solution contemplated by the present invention can obtain the following beneficial effects:
(1) the soil body injected with the MICP slurry is forcibly stirred, so that the slurry is more uniformly distributed, the subsequent microorganism curing process is more uniform, and the improvement of the soil body strength is facilitated;
(2) in the process that the stirring head is arranged one above the other, two stirring grouting operations are completed, the grout does not need to be permeated, and the efficiency is higher;
(3) the soil body is stirred for grouting, so that the soil body with poor permeability, which is difficult to treat in common grouting operation, can be subjected to microbial curing treatment, and the applicability is strong;
(4) the device of the invention can be reused.
Drawings
FIG. 1 is a schematic view of the overall structure of an indoor testing device for uniformly solidifying clay by microorganisms according to the present invention;
FIG. 2 is an enlarged front view of the stirring rod and the stirring head of the indoor testing device for uniformly solidifying clay by microorganisms according to the present invention;
fig. 3 is an enlarged structural side view of a stirring rod and a stirring head in the indoor testing device for uniformly solidifying clay by microorganisms according to the present invention.
The same reference numbers will be used throughout the drawings to refer to the same or like elements or structures, wherein:
the device comprises a power head 1, a stirring rod connector 2, a stirring rod 3, a stirring extension rod 4, a stirring head 5, a stirring blade 6, a grouting pump 7, a slurry conveying pipe 8, a movable small hydraulic lifting support 9, a model box 10 for placing clay samples, a slurry spraying port 11 and a slurry inlet 12.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention is described in detail below with reference to the figures and specific embodiments.
FIG. 1 is a schematic view of the overall structure of an indoor testing device for uniformly solidifying clay by microorganisms according to the present invention; fig. 2 is an enlarged schematic structural view of a stirring rod and a stirring head in the indoor testing method for uniformly solidifying clay by microorganisms according to the present invention. As shown in fig. 1 and 2, the present embodiment provides an indoor testing method for uniformly solidifying clay by microorganisms, the whole set of apparatus includes: unit head 1, puddler connector 2, puddler 3, stirring extension rod 4, the stirring head 5, stirring vane 6, the mudjack 7, defeated thick liquid pipe 8, mobilizable small-size hydraulic pressure lifting support 9 and the mold box 10 of placing the clay sample, unit head 1 is fixed on lifting support 9, puddler 3 upper end is connected with the unit head through puddler connector 2, stirring extension rod 4 lower extreme is connected with stirring head 5, the grout inlet 12 of the lateral wall is connected with the mudjack 7 through defeated thick liquid pipe 8 on the puddler connector 2, puddler 3, all be equipped with the passageway that supplies the thick liquid to flow in stirring extension rod 4 and the puddler 5, 5 lower parts of puddler are equipped with stirring vane 6 and spouting mouth 11.
The stirring rod connector 2 is divided into an upper part and a lower part, a slurry channel is arranged in the upper part, the slurry inlet 12 is positioned on the side wall of the upper part, the outlet of the slurry channel is positioned in the center of the bottom of the tap joint at the upper part and is connected with the slurry channel of the stirring rod at the lower part, and the upper part of the stirring rod connector 2 is kept static under the action of the power head 1. The lower part of the stirring rod connector 2 is connected with the stirring rod 3, and the stirring rod 3, the stirring extension rod 4 and the stirring head 5 are driven to rotate together under the action of the power head 1.
Fig. 2 is an enlarged schematic structural view of a stirring rod and a stirring head in the indoor testing device for uniformly solidifying clay by microorganisms according to the present invention. As shown in fig. 2, the stirring rod is divided into two types: a stirring rod 3 and a stirring extension rod 4. Wherein the upper part of the stirring rod 3 is an expanded head, the side wall of the expanded head is provided with a plurality of grooves for connecting the stirring rod connector, and the lower part is connected with the lower stirring extension rod 4 through a bolt; a through slurry channel is arranged inside the stirring extension rod 4, and the slurry channel continues to extend above the expansion head until the slurry channel is connected with the outlet of the slurry channel at the bottom of the upper part of the stirring rod connector 2; the stirring extension rods 4 are internally provided with slurry channels which are communicated up and down, in actual operation, the treatment depth can be improved by increasing the number of the stirring extension rods 4, and the stirring extension rod 4 at the bottommost layer is connected with the stirring head 5; the stirring rod 3 and the stirring extension rod 4, and the stirring extension rod 4 and the stirring head 5 are connected through bolts.
3 groups of stirring blades 6 are arranged on the stirring head 5 in a surrounding way, each group comprises two blades, and the included angle formed between each blade and the horizontal direction is 20-30 degrees and is fixed in a welding way. The 3 groups of blades are uniformly distributed on the stirring head 5 at equal intervals, wherein the grout spraying port 11 is positioned near the middle blade group, and when the stirring head rotates and descends, the top blade group can timely stir the soil body sprayed with grout; when the stirring head 5 rotates and rises, the bottom blade group can timely stir the soil body sprayed with the slurry.
The grouting pump 7, the power head 1 and the lifting bracket 9 are respectively electrically connected with respective controllers. The speed of the MICP slurry sprayed into the soil body is regulated and controlled by operating the controller of the grouting pump 7; setting the rotation speed and the rotation direction of the stirring rod 3, the stirring extension rod 4 and the stirring head 5 by controlling a controller of the power head 1; the height of the stirring head 5 before stirring and grouting and the descending and ascending speed of the stirring head 5 in the stirring and grouting process are set by controlling the controller of the lifting bracket 9.
The universal wheels are arranged at the bottom of the lifting support 9, and can be horizontally moved at will, so that the horizontal position of the stirring head is changed, stirring grouting operation of a plurality of different positions is performed on a to-be-treated clay body on the premise of not changing the position of the model box, and the efficiency of improving the performance of the soil body is improved.
The main test steps of the invention are as follows:
(1) taking the clay to be processed back from the site and putting the clay into a model box, and when the soil body in the model box reaches 2/3-3/4 of the height of the model box, leveling the surface of the soil body to solidify the clay to be processed for at least 30 days;
(2) according to the maximum treatment depth of the soil to be treated, selecting a proper number of stirring rods to complete the connection of the devices;
(3) adjusting the height and the horizontal position of the stirring head to ensure that the stirring head is just above the point to be treated;
(4) preparing MICP slurry, connecting a grouting pump, and setting the grouting pump to be at a lower pressure; the MICP slurry consists of bacterial liquid, urea solution and CaCl2The solution is mixed in equal volume. OD of bacterial liquid6000.5-2, the concentration of the urea solution is 0.5-2 mol/L, CaCl2The concentration of the solution is between 0.5 and 2 mol/L; the MICP slurry should be uniformly stirred at a low speed before being connected to a grouting pump so as to uniformly mix the bacterial liquid, the urea and the CaCl2The solution can prevent the delamination of MICP slurry and the rapid deposition of calcium carbonate, and avoid the blockage of pipelines, ports and the like of the device;
(5) opening the power head and a grouting pump, controlling the lifting support to descend at a preset speed, and stirring and grouting; when the stirring head is lowered to the maximum treatment depth, adjusting the power head to enable the stirring head to rotate reversely, adjusting the lifting support to ascend at the same speed, and stirring and grouting;
(6) and after the stirring head finishes the one-over-one stirring and grouting operation, closing the power head and the grouting pump, and moving the stirring head to the position above the next point to be processed through the lifting support.
The method of practicing the invention is described below in connection with a particular application:
(1) filling the clay to be processed into a model box, wherein the height of the filled soil body is about 2/3 of the height of the model box, after filling, performing trowelling processing on the surface of a soil body sample, and standing for 30 days to fully solidify the clay to be processed;
(2) selecting a proper number of stirring extension rods 4, connecting the stirring rods and the stirring heads by using bolts, and treating the bolt joints by using a sealant to avoid leakage of slurry at the joints;
(3) and positioning the stirring head. The universal wheel at the bottom of the lifting support is utilized to horizontally move the lifting support, and the horizontal position of the stirring head is adjusted to reach the position right above the point to be processed of the sample; adjusting the height of the lifting support to ensure that the bottom of the stirring head is just in contact with the surface of the clay body to be treated;
(4) and preparing the MICP slurry and connecting a grouting pump. Simultaneously opening a grouting pump, setting a lower pressure value, pumping the MICP slurry into a stirring device (a stirring rod connector, a stirring rod and a stirring head) through a slurry conveying pipe, and exhausting all gas in an MICP slurry channel in the device; the MICP slurry is prepared from bacterial liquid, urea and CaCl2The solution is mixed. Bacterial liquid concentration OD600The values expressed, taken as 1.0, ensure a sufficient bacterial count; the concentration of the urea solution is 1.5 mol/L; CaCl2The concentration is 2 mol/L.
(5) Stirring and grouting. When liquid flows out from a slurry spraying port on the stirring head, starting the power head to drive the stirring head and the stirring rod to rotate clockwise at a preset speed; increasing the pressure value of the grouting pump to a preset value, and increasing the flow rate of the MICP slurry; the controller for setting the lifting bracket controls the lifting bracket to descend at a preset speed. Along with the stirring head changes into the soil body into, the MICP thick liquid is spouted into in the clay of treating through the spouting mouth, and a set of stirring vane that is located the spouting mouth top simultaneously can cut the stirring immediately to the soil body that spouts the MICP thick liquid, guarantees the homogeneity of MICP thick liquid distribution. After the stirring head descends to a preset treatment depth, the stirring rod and the stirring head are controlled to rotate anticlockwise at the same speed by setting a controller of the power head; and the power head is controlled to ascend at the same speed by setting a controller of the lifting bracket. Along with the rotatory rising of stirring head, MICP thick liquid constantly spouts MICP thick liquid to pending clay through spouting the mouth, and a set of stirring vane that is located the spouting mouth below can cut the stirring to the soil body of spouting the thick liquid immediately, promotes the homogeneity that the thick liquid distributes. When the stirring head rises to be separated from the soil body, the grouting pump and the power head are closed, the lifting of the lifting support is stopped, and the surface of the treated soil body is trowelled, so that primary stirring grouting is completed;
(6) and moving the stirring head to the next soil body to-be-treated point by using the universal wheel of the lifting device, and repeating the operation until the stirring and grouting operation of all the to-be-treated points is completed.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The utility model provides an indoor test device based on little biotechnology homogeneous solidification clay which characterized in that includes: the device comprises a power head (1), a stirring rod connector (2), a rotary joint, a stirring rod (3), a stirring head (5), a mud jacking pump (7), a mud conveying pipe (8), a movable lifting support (9), a model box (10) for placing clay samples and at least one stirring extension rod (4);
the power head (1) is fixed on a movable lifting bracket (9), and the upper end of the stirring rod (3) is connected with the power head (1) through a stirring rod connector (2); a slurry inlet (12) is arranged on the side wall of the stirring rod connector (2), and the slurry inlet (12) is connected with a slurry pressing pump (7) through a slurry conveying pipe (8);
channels for slurry to flow are arranged in the stirring rod connector (2), the stirring rod (3) and the stirring head (5); the lower part of the stirring head (5) is provided with a stirring blade (6) and a slurry spraying port (11), and a slurry inlet (12) is connected with a slurry channel at the upper end of the stirring rod (3) through a rotary joint;
the stirring rod connector (2) is divided into an upper part and a lower part, the upper part is fixed relative to the power head (1), and the slurry inlet (12) is positioned on the side wall of the upper part; the lower half part can rotate relative to the upper half part, the upper end of the lower half part is connected with the power head (1), the lower end of the lower half part is connected with the upper end of the stirring rod (3), and a channel opening at the upper end of the stirring rod (3) is positioned in the lower half part; the opening of the channel at the upper end of the stirring rod (3) is connected with the slurry inlet (12) through a rotary joint;
the stirring extension rod (4) is used for connecting the stirring rod (3) and the stirring head (5), and a channel for slurry to flow is arranged inside the stirring extension rod (4) and is communicated with the channels in the stirring rod (3) and the stirring head (5).
2. The laboratory test device for uniformly curing clay based on microbiological technology as claimed in claim 1, wherein the movable lifting support (9) is a hydraulic lifting frame, and the bottom of the movable lifting support is provided with a universal wheel, and the universal wheel has a self-locking structure.
3. The laboratory test device for uniformly curing clay based on microbiological technology as claimed in claim 1, wherein a plurality of groups of stirring blades (6) are disposed under the stirring head (5), and an included angle between the stirring blades (6) and the horizontal direction is 20 ° to 30 °.
4. The laboratory test device for uniformly solidifying clay based on the microorganism technology as claimed in claim 3, wherein there are three groups of stirring blades (6) arranged on the stirring head (5) from top to bottom, and each group of two stirring blades (6) is symmetrically distributed on two sides of the axis of the stirring head (5).
5. The laboratory test device for uniformly curing clay based on microbiological technology as claimed in claim 4, wherein the spouting port (11) is located near the stirring blade (6) of the middle layer.
6. The laboratory test device for uniformly curing clay based on the microbiological technology as claimed in any one of claims 1 to 5, further comprising a controller; the power head (1), the grouting pump (7) and the lifting support (9) are respectively electrically connected with the controller, and the controller is used for controlling the rotating speed of the power head (1), the pressure of the grouting pump (7) and the lifting speed and the height of the lifting support (9).
7. A method of performing a homogeneous cure test on a laboratory test apparatus according to any one of claims 1 to 6, comprising the steps of:
(1) filling the clay to be treated into a model box (10), and when the clay to be treated is filled to a preset height, leveling and standing the surface of a soil body to fully solidify the clay to be treated under the action of self weight;
(2) selecting a proper number of stirring extension rods (4) to adjust the length of the stirring rods according to the maximum treatment depth of the clay to be treated, and completing the installation of the stirring head (5);
(3) adjusting the height and the horizontal position of the stirring head (5) to ensure that the stirring head is just above the point to be treated;
(4) preparing a sufficient amount of MICP slurry and connecting a slurry pump (7) and a slurry inlet (12); the MICP slurry is prepared from bacterial liquid, urea and CaCl2Mixing the solutions in equal volumes; OD of bacterial liquid6000.5-2, the concentration of the urea solution is 0.5-2 mol/L, CaCl2The concentration of the solution is between 0.5 and 2 mol/L;
(5) opening the power head (1) and the grouting pump (7), controlling the lifting support (9) to descend at a preset speed, and stirring and grouting; when the stirring head (5) is lowered to the maximum treatment depth, adjusting the power head (1) to enable the stirring head (5) to rotate reversely, adjusting the lifting support (9) to ascend at the same speed when the stirring head descends, and stirring and grouting;
(6) and (5) after the stirring head (5) finishes the stirring and grouting operation from top to bottom, closing the power head and the grouting pump, moving the stirring head to the position above the next point to be processed through the lifting support, and repeating the step (5) until all stirring is finished.
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| CN110438975B (en) * | 2019-07-23 | 2021-09-17 | 河海大学 | Microbial grouting device for reinforcing deep soft clay and construction method |
| CN112813961B (en) * | 2021-01-13 | 2024-06-14 | 大连理工大学 | Layered double-channel underground grouting structure and method |
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| 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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