CN112813961A - Layered double-channel underground grouting structure and method - Google Patents
Layered double-channel underground grouting structure and method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 61
- 239000002689 soil Substances 0.000 claims abstract description 38
- 239000011440 grout Substances 0.000 claims abstract description 23
- 230000002787 reinforcement Effects 0.000 claims abstract description 15
- 239000002002 slurry Substances 0.000 claims abstract description 11
- 230000002265 prevention Effects 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 239000004698 Polyethylene Substances 0.000 claims description 28
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000007789 sealing Methods 0.000 claims description 21
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- 239000011148 porous material Substances 0.000 claims description 15
- 230000000813 microbial effect Effects 0.000 claims description 14
- 230000008569 process Effects 0.000 claims description 14
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 13
- 230000035699 permeability Effects 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 11
- 244000005700 microbiome Species 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 9
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 6
- 230000006872 improvement Effects 0.000 claims description 6
- 238000011156 evaluation Methods 0.000 claims description 5
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 3
- 230000033558 biomineral tissue development Effects 0.000 claims description 3
- 239000001110 calcium chloride Substances 0.000 claims description 3
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- 238000005553 drilling Methods 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 101000965313 Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513) Aconitate hydratase A Proteins 0.000 abstract 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
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Abstract
The invention belongs to the technical field of grouting for reinforcing a soil foundation and seepage prevention and leakage stoppage, and particularly relates to a layered double-channel underground grouting structure and method. The structure comprises a slurry supply system, a grouting system and a monitoring system. The layered grouting of the soil body can be realized by the serially connected grouting sleeve and the tension fixing separator in the grouting system. The synergistic effect of the double-channel slurry supply, the openable grouting holes and the tension fixing separator can realize the time-sharing channel-divided grouting of different types of grouting liquid. The acoustic detector can monitor and evaluate the cementation degree of the soil body in real time. The structure of the invention can meet the requirements of different cementation degrees in stratum grouting reinforcement only by once hole forming, reduces the moving times of the grouting pipe, and improves the working efficiency and the utilization rate of slurry. The layered grouting and cementing degree real-time monitoring technology avoids the waste of grout and improves the utilization rate of the grout. The structure has important significance for popularizing the application of MICP underground grouting in projects such as foundation reinforcement, seepage prevention, leakage stoppage and the like.
Description
Technical Field
The invention belongs to the technical field of grouting reinforcement of soft soil foundations and seepage prevention and leakage stoppage, and relates to a layered double-channel underground grouting structure and method.
Background
The grouting method is a common foundation reinforcing, anti-seepage and leak-stopping treatment method. By injecting the cementing liquid into the target area, cracks of rocks and cement liner pipes can be successfully repaired, dam erosion is reduced, pipeline leakage is prevented, water source pollution is isolated, and soil permeability is reduced to reduce permeation deformation and the like. The traditional grouting liquid, such as cement grout, has high viscosity, is difficult to pour when being applied to fine soil reinforcement or tiny crack repair, and even can cause the splitting damage of the original structure due to higher grouting pressure. Although the chemical grout has better groutability, the existing grout material often has certain toxicity and is easy to cause serious damage to the environment.
Microbial induced calcium carbonate precipitation (MICP) is an emerging method of ground improvement. The main principle is to use the activity of microorganism to induce and generate calcium carbonate. The technology is a natural-imitating green high-efficiency ore-forming technology. The generated calcium carbonate is used as a cementing material to cement soil particles together, so that the strength of a soil body is improved, or the calcium carbonate is filled in pores or cracks of the soil body to reduce the permeability of the soil body, and plays roles in reinforcing the soil body and preventing seepage and stopping leakage.
Successful application of MICP relies on the presence of microbial fluids as well as cementing fluids in the formation. The microorganism liquid and the cementing liquid can be smoothly injected into the soil body by a grouting method. However, with respect to current grouting techniques using MICP, a single grouting pipe is mostly used for grouting. Research has shown that when the microbial liquid is transported in a pipeline, part of the thallus is adsorbed on the pipeline wall. By adopting a single pipeline to inject the microbial liquid and the cementing liquid, the microorganisms adsorbed on the pipeline can induce the generation of calcium carbonate on the inner wall of the pipeline, which causes unnecessary MICP consumption and reduces the utilization rate of MICP. Meanwhile, calcium carbonate is generated in the pipeline for a long time, and the inner diameter of the pipeline is reduced, even the pipeline is blocked. Therefore, it is necessary to adopt a double-passage grouting. In addition, in the MICP reinforcement process, the grout holes are easily clogged due to the rapid generation of calcium carbonate, and the clogging of the grout holes must be considered in the design of the grouting process.
If only a single point source is used in the grouting process, the grout is injected into the target soil layer, which often results in an excessively long grouting time due to an excessively large flow path. In addition, research has shown that the adsorption of microorganisms in the porous medium is exponentially attenuated along the injection direction, and the adsorption amount of the microorganisms on the soil is reduced along the grouting direction, so that the yield of calcium carbonate is reduced along the grouting direction. Thus, relying on a single point source for a long time may result in an excessively high calcium carbonate production near the grout port, or even a complete blockage of the flow path, while in areas remote from the grout port, the calcium carbonate production may be insufficient. Moreover, in actual engineering, geological conditions of target areas needing reinforcement or seepage prevention and leakage stoppage are not consistent, and permeability difference is obvious. The flowing rule of grouting liquid in the formations with different permeability characteristics is complex, and the flowing path is difficult to determine and control.
Disclosure of Invention
Aiming at the problems, the invention provides a layered double-channel underground grouting structure and a layered double-channel underground grouting method.
The technical scheme of the invention is as follows:
a layered double-channel underground grouting structure mainly comprises a slurry supply system, a grouting system and a monitoring system;
the pulp supply system comprises a liquid reservoir 1, a constant pressure water pump 2, a PE hose 3, an electromagnetic flowmeter 4 and a pipeline adapter 5; the liquid reservoir 1 is used for containing grouting liquid; one end of the PE hose 3 is placed at the bottom of the liquid receiver 1, and the other end of the PE hose passes through the constant pressure water pump 2 and is connected to the pipeline adapter 5; the PE hose 3 is provided with an electromagnetic flowmeter 4 for measuring grouting amount; the constant pressure water pump 2 can adjust grouting pressure and adopt proper grouting pressure for target areas with different depths and different permeabilities;
the grouting system comprises a grouting inner pipe 6, a grouting outer pipe 7, a conical drill bit 8, a grouting hole 9 and a tension fixing barrier 16; the grouting inner pipe 6 is positioned in the grouting outer pipe 7, and the lower ends of the grouting inner pipe and the grouting outer pipe are respectively welded with a conical drill bit 8; a plurality of grouting hole groups 9 are arranged at a certain height from the lower end of the grouting inner pipe 6 upwards; each grouting hole group 9 includes a plurality of grouting holes 10 in the circumferential direction and the height direction as a flow passage of grouting liquid; a plurality of grouting holes 10 are arranged on the grouting outer pipe 7 at positions corresponding to the grouting inner pipe 6; the size of the grouting hole 10 is the same as that of the grouting hole 10 on the grouting inner pipe 6;
each grouting hole group 9 is provided with a series of electromagnetic valves 11, and the opening and closing of the grouting holes 10 are realized by controlling the electromagnetic valves 11; the electromagnetic valve 11 mainly comprises a sealing block 12, a magnetic control switch 13, a telescopic spring 14 and a protective shell 15; the electromagnetic switch 13 is connected with the sealing block 12 through a telescopic spring 14; the protective shell 15 is welded on the inner walls of the grouting inner pipe 6 and the grouting outer pipe 7; one end of the protective shell 15 close to the sealing block 12 is opened, and the size of the opening is the same as that of the sealing block 12; when the magnetic switch 13 is turned on, the sealing block 12 moves towards the protective shell 15 under the action of electromagnetic attraction, and the telescopic spring 14 is compressed at the moment; when the magnetic switch 13 is turned off, the sealing block 12 moves out of the protective shell 15 under the action of the telescopic spring 14 and completely covers the grouting hole 10; electromagnetic valves 11 are arranged on the inner walls of the grouting inner pipe 6 and the grouting outer pipe 7 at the position of the grouting hole group 9; a tension fixing barrier 16 is arranged between the adjacent grouting hole groups 9; the opening and closing of the tension fixing barrier 16 are used for carrying out layered grouting and preventing grout from continuously rising along the grouting outer pipe 7 when grouting is carried out by the grouting inner pipe 6;
the acoustic detector 17 is positioned in the protective shell 15 of the electromagnetic valve 11 and is fixed on the grouting outer pipe 7; the acoustic detector 17 mainly consists of an acoustic transmitter and an acoustic receiver; and the sound wave receiver receives the attenuated reflected wave, analyzes the target area after grouting reinforcement or seepage prevention and leakage stoppage according to the change of the waveform amplitude, and judges the improvement effect. According to the real-time monitoring result feedback, grouting reinforcement can be adjusted or stopped in time, excessive or ineffective grouting is avoided, and grouting efficiency is improved.
A use method of a layered double-channel underground grouting structure comprises the following steps:
firstly, drilling a grouting structure into a stratum; culturing a microbial solution and preparing a cementing solution; opening the magnetic control valves 11 of the grouting hole groups 9 on the grouting inner pipe 6 and the grouting outer pipe 7, wherein the grouting hole groups correspond to target soil layers, and opening the tension fixing barrier 16 between the grouting outer pipe 7 and the grouting inner pipe 6 to ensure that microbial fluid flows to the soil layer to be treated only through the grouting hole groups 9 corresponding to the target areas;
connecting a pulp supply system; putting one end of a PE hose 3 into the bottom of a liquid reservoir 1 filled with microorganism liquid, and connecting the other end of the PE hose 3 with a grouting pipe through a pipeline adapter 5; an electromagnetic flowmeter 4 is arranged on the PE hose 3; adjusting the grouting pressure of the constant pressure water pump 2; opening a constant pressure water pump 2, and injecting a preset volume of microbial liquid into a target soil layer or a leakage area to be blocked through a grouting outer pipe 7, wherein the preset volume is determined by the total volume of pores in an area to be reinforced, so that the total volume of the pores in the area to be treated is not less than the total volume of the pores in the area to be treated;
the constant pressure water pump 2 is closed; closing the electromagnetic valve 11 on the grouting inner pipe 6, and then closing the grouting hole group 9 on the grouting inner pipe 6; closing a tension fixing barrier 16 above the opened grouting hole group 9 on the grouting inner pipe 6, and communicating the grouting outer pipe 7 with a grouting channel of a grouting pipe orifice; placing a PE hose 3 at the bottom of a liquid reservoir 1 filled with stationary liquid; opening the constant pressure water pump 2, and immediately injecting a preset volume of stationary liquid into the soil body; the fixing solution consists of 50mM calcium chloride solution; stopping grouting for 4h to ensure that the thalli are fully adsorbed in the stratum;
placing one end of a PE (polyethylene) hose 3 in a liquid reservoir 1 filled with a cementing liquid, and injecting a cementing liquid with a preset volume into a target area; the cementing liquid consists of 1M calcium chloride and urea; stopping grouting for 4 hours after each grouting is finished; circulating the grouting process for multiple times; under the action of microorganisms, biomineralization reaction can occur in the stratum to generate calcium carbonate, so that pores are filled, the soil strength is improved, and the soil permeability is reduced; in the whole grouting process, the acoustic detector 17 is turned on, acoustic waves reflected by a target area are collected in real time, and the pore filling effect of the target area is evaluated; and grouting operation is adjusted or grouting is stopped in time according to the evaluation result, so that excessive grouting or ineffective grouting is avoided.
After the target area is processed, the grouting hole group 9 corresponding to the target stratum is closed, and the grouting hole group 9 corresponding to the other target stratum is opened. And performing all the grouting operation steps until grouting reinforcement of the whole area is completed.
Over grouting at the same grouting site can result in over cementing in areas near the grout port and under cementing in areas away from the grout port. By adopting the layered grouting method, the grouting amount of single grouting is reduced, the blockage near a grouting opening is avoided, the slurry is more reasonably distributed, and the grouting efficiency is higher. And the grouting pipe does not need to be moved during layered grouting, so that the grouting reinforcement engineering quantity is greatly reduced. Meanwhile, the improvement effect of the target area is monitored in real time in the grouting process, accurate grouting is realized, the utilization rate of the slurry is improved, and the required construction period is greatly shortened. Has important significance for popularizing the application of MICP grouting in the aspect of reinforcing the foundation.
The invention has the beneficial effects that:
(1) the time-sharing opening and closing of each grouting component controlled by the electromagnetic valve can be controlled by the tension fixed breaker so as to respectively grout different stratums. The problem of different permeability stratum, the grout liquid mainly flows in high permeability soil, is difficult to permeate low permeability soil layer and results in poor grouting effect is solved.
(2) Through many grout punch combination and constant pressure water pump, can carry out the layering grout to different layering or individual layer high thick soil layer as far as possible after once the pore-forming, reduce the removal number of times of grout pipe, also avoided the thick liquid loss that remote infiltration caused, improved grout efficiency and thick liquid utilization ratio.
(3) The dual-channel grouting pipe is adopted, so that the interaction of different grouting liquids in a grouting pipeline is avoided, the loss of the grouting liquids in the transportation process is reduced, and the problem that grouting holes are easy to block is solved.
(4) The acoustic monitoring system is integrated in the magnetic control valve, real-time monitoring can be carried out on the treatment effect when the soil layer is treated in grouting, the grouting process can be adjusted in time according to the evaluation result, the grouting time can be controlled accurately, ineffective grouting and excessive grouting can be avoided, and the grouting efficiency can be improved.
(5) The whole grouting structure has rich functions, clear principle, low manufacturing cost and convenient construction operation, and has important significance for popularizing the application of MICP grouting in the aspects of foundation reinforcement and seepage prevention and leakage stoppage.
Drawings
Fig. 1 is a front view of a layered double passage grouting structure.
Fig. 2 is a front view of the solenoid valve.
In the figure: 1 liquid storage device; 2, a constant pressure water pump; 3PE hose; 4, an electromagnetic flowmeter; 5, pipeline adapter coupling; 6 grouting an outer pipe; 7 grouting an inner pipe; 8 a conical drill bit; 9 grouting hole groups; 10 grouting holes; 11 an electromagnetic valve; 12 sealing the block; 13 a magnetic control switch; 14 a telescoping spring; 15 a protective shell; 16 tension fixing the barrier; 17 an acoustic wave probe.
Detailed Description
In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings and the detailed description thereof:
as shown in fig. 1-2, in the present example, a layered double-passage underground grouting structure is disclosed, in which a liquid reservoir 1 is made of a large plastic bucket, and the volume thereof can be adjusted in real time according to the volume of a predetermined slurry. The PE hose 3 has an inner diameter of 32mm, and one end thereof is placed on the bottom of the liquid reservoir and the other end thereof is connected to the pipe joint 5 through the constant pressure water pump 2. The PE hose 3 is provided with an electromagnetic flowmeter 4. The constant pressure water pump 2 can adjust grouting pressure, and can adopt proper grouting pressure for areas to be grouted with different depths and different permeabilities. The grouting outer pipe 7 and the grouting inner pipe 6 are respectively welded with the conical drill bit 8. The outer grouting pipe 7 is a metal steel pipe with an inner diameter of 60mm and a wall thickness of 8mm, and the inner grouting pipe 6 is a metal steel pipe with an inner diameter of 32mm and a wall thickness of 8 mm. One grouting hole group 9 is provided upward at a certain distance from the lower end of the grouting inner pipe 6. Each of the grouting hole groups 9 includes a plurality of grouting holes 10 in a circumferential direction and a height direction, and the diameter of the grouting holes 10 is 5 mm. And a plurality of grouting holes 10 are arranged on the grouting outer pipe 7 at positions corresponding to the grouting inner pipe 6, and the diameter of the hole openings of the grouting holes 10 is 5 mm. An electromagnetic valve 11 is provided in each grouting hole group 9.
The electromagnetic valve 11 is composed of a sealing block 12, a magnetic switch 13, a telescopic spring 14 and a protective shell 15. The magnetic switch 13 is connected with the sealing block 12 through a telescopic spring 14. The protective shell 15 is a cuboid and is formed by welding steel plates and is welded with the inner wall of the grouting pipe. One end of the protective shell 15 close to the sealing block 12 is open, and the size of the opening is the same as that of the sealing block 12. The sealing block 12 is made of silica gel, has a length of 7mm, and is rectangular as a whole. When the magnetic switch 13 is opened, the sealing block 12 moves towards the protective shell 15 under the action of the electromagnetic attraction force. At which time the extension spring 14 is compressed. When the magnetic switch 13 is closed, the sealing block 12 moves outwards from the protective shell 15 under the action of the telescopic spring 14 and completely covers the grouting hole 10. A tension fixation barrier 16 is provided between adjacent grouted hole groups 9. By adjusting the opening and closing of the tension fixing barrier 16, the layered grouting can be performed, and the grouting liquid flowing out of the grouting inner tube 6 is prevented from continuously rising along the grouting outer tube.
The acoustic detector 17 is positioned in the protective shell 15 of the electromagnetic valve 11 and is fixed on the grouting outer pipe 7; the acoustic wave probe 17 is mainly composed of an acoustic wave transmitter and a receiver. The wave detector (17) mainly comprises an acoustic wave emitter and an acoustic wave receiver; and the sound wave receiver receives the attenuated reflected wave, analyzes the target area after grouting reinforcement or seepage prevention and leakage stoppage according to the change of the waveform amplitude, and judges the improvement effect. According to the evaluation result, grouting reinforcement can be adjusted or stopped in time, excessive grouting or ineffective grouting is avoided, and grouting efficiency is improved.
The operation method provided by the invention mainly comprises the following steps:
the grouting inner pipe 6 and the grouting outer pipe 7 are first drilled into the ground by means of a conical drill bit 8. And (3) culturing the microbial liquid in a mobile laboratory on site, and preparing the cementing liquid. And opening the electromagnetic valves 11 on the grouting inner pipe 6 and the grouting outer pipe 7, wherein the target soil layer corresponds to the grouting hole group 9. And opening the tension fixing barrier 16 between the grouting outer pipe 7 and the grouting inner pipe 6, so that the microbial liquid flows to the soil layer to be treated only through the grouting hole group 9 corresponding to the target area.
And connecting a pulp supply system. One end of the PE hose 3 is placed at the bottom of the liquid storage device 1, microbial liquid is placed in the liquid storage device 1, and the other end of the PE hose is connected with the grouting pipe through the pipeline adapter 5. The electromagnetic flowmeter 4 is arranged on the PE hose, and parameters such as grouting pressure of the constant pressure water pump 2 are adjusted. And (3) opening the constant pressure water pump 2, and injecting a preset volume of microbial liquid into the target soil layer or the leakage area to be blocked through the grouting inner pipe 6. The predetermined volume is determined by the total volume of the pores in the region to be consolidated, which is generally not less than the total volume of the pores in the region to be treated.
The constant pressure water pump 2 is turned off. The electromagnetic valve 11 on the grouting inner pipe 6 is closed, and the grouting hole group 9 on the grouting inner pipe 6 is closed. And closing the tension fixing barrier 16 above the opened grouting hole group 9 on the grouting inner pipe 6, and communicating the grouting outer pipe 7 to a grouting passage of the grouting pipe opening. The PE hose 3 is placed at the bottom of the stationary liquid reservoir 1. The whole conversion process is simple to operate, fast and convenient. And (3) opening the constant pressure water pump 2, and immediately injecting a preset volume of stationary liquid into the soil body. The fixative solution consisted of a 50mM calcium chloride solution. Stopping grouting for 4h to make the thallus be fully adsorbed on the soil particles.
Placing the end opening of the PE hose 3 in the cementing liquid reservoir 1, and injecting a preset volume of cementing liquid into the target area. The cementing liquid consists of 1M calcium chloride and urea. After each grouting, grouting was stopped for 4 hours. And (5) circulating the grouting process for multiple times. Under the action of microorganisms, biomineralization reaction can occur in the stratum to generate calcium carbonate, so that pores are filled, the soil strength is improved, and the soil permeability is reduced; . In the whole grouting process, the acoustic detector 17 is turned on, acoustic waves reflected back by the target area are collected in real time, and the pore filling effect of the target area is evaluated. And according to the evaluation result, the grouting method is adjusted or grouting is stopped in time, so that excessive grouting or ineffective grouting is avoided.
After the target area is treated, the grouting hole group 9 corresponding to the target stratum is closed, and the grouting hole group corresponding to the other target stratum is opened. And repeating all the grouting operation steps until the grouting treatment of the whole target area is completed.
Over grouting at the same grout site will result in over cementing near the grout port area, creating a blockage, while areas far from the grout port will be under reinforced. By adopting the layered grouting method, the grouting amount of single grouting is reduced, the blockage near a grouting opening is avoided, the slurry is more reasonably distributed, and the grouting efficiency is higher. And the grouting pipe does not need to be moved during layered grouting, so that the grouting reinforcement engineering quantity is greatly reduced. Meanwhile, the improvement effect of the target area is monitored in real time in the grouting process, accurate grouting is realized, the utilization rate of the slurry is improved, and the required construction period is greatly shortened. Has important significance for popularizing the application of MICP grouting in the aspect of reinforcing the foundation.
Claims (2)
1. A layered double-channel underground grouting structure is characterized in that the layered double-channel underground grouting structure mainly comprises a slurry supply system, a grouting system and a monitoring system;
the slurry supply system comprises a liquid reservoir (1), a constant pressure water pump (2), a PE (polyethylene) hose (3), an electromagnetic flowmeter (4) and a pipeline adapter (5); the liquid reservoir (1) is used for containing grouting liquid; one end of the PE hose (3) is arranged at the bottom of the liquid reservoir (1), and the other end of the PE hose passes through the constant pressure water pump (2) and is connected to the pipeline adapter (5); the PE hose (3) is provided with an electromagnetic flowmeter (4) for measuring the grouting amount; the constant pressure water pump (2) can adjust grouting pressure, and proper grouting pressure is adopted for target area soil layers with different depths and different permeabilities;
the grouting system comprises a grouting inner pipe (6), a grouting outer pipe (7), a conical drill bit (8), a grouting hole (9) and a tension fixing barrier (16); the grouting inner pipe (6) is positioned in the grouting outer pipe (7), and the lower ends of the grouting inner pipe and the grouting outer pipe are respectively welded with the conical drill bit (8); a plurality of grouting hole groups (9) are arranged at a certain height from the lower end of the grouting inner pipe (6) upwards; each grouting hole group (9) comprises a plurality of grouting holes (10) along the circumferential direction and the height direction and is used as a circulation channel of grouting liquid; a plurality of grouting holes (10) are arranged on the grouting outer pipe (7) at positions corresponding to the grouting inner pipe (6); the size of the grouting hole (10) is the same as that of the grouting hole (10) on the grouting inner pipe (6);
each grouting hole group (9) is provided with a series of electromagnetic valves (11), and the opening and closing of the grouting holes (10) are realized by controlling the electromagnetic valves (11); the electromagnetic valve (11) mainly comprises a sealing block (12), a magnetic control switch (13), a telescopic spring (14) and a protective shell (15); the electromagnetic switch 13 is connected with the sealing block (12) through a telescopic spring (14); the protective shell (15) is welded on the inner walls of the grouting inner pipe (6) and the grouting outer pipe (7); one end of the protective shell (15) close to the sealing block (12) is provided with an opening, and the size of the opening is the same as that of the sealing block (12); when the magnetic switch (13) is opened, the sealing block (12) moves towards the protective shell (15) under the action of electromagnetic attraction, and the telescopic spring (14) is compressed at the moment; when the magnetic switch (13) is closed, the sealing block (12) moves out of the protective shell (15) under the action of the telescopic spring (14) and completely covers the grouting hole (10); electromagnetic valves (11) are arranged on the inner walls of the grouting hole groups (9) of the grouting inner pipe (6) and the grouting outer pipe (7); a tension fixing barrier (16) is arranged between the adjacent grouting hole groups (9); the opening and closing of the tension fixing barrier (16) can be used for layered grouting; in addition, the tension fixing barrier can prevent the grout from rising along the grouting outer pipe (7) continuously when grouting is carried out by the grouting inner pipe (6);
the acoustic detector (17) is positioned in the protective shell (15) of the electromagnetic valve (11) and is fixed on the grouting outer pipe (7); the sound wave detector (17) mainly comprises a sound wave emitter and a sound wave receiver; and the sound wave receiver receives the attenuated reflected wave, analyzes the target area after grouting reinforcement or seepage prevention and leakage stoppage according to the change of the waveform amplitude, and judges the improvement effect.
2. An operation method of layered double-channel underground grouting is characterized by comprising the following steps:
firstly, drilling a grouting structure into a stratum; culturing a microbial solution and preparing a cementing solution; opening a magnetic control valve 11 of a grouting hole group 9 on the grouting inner pipe (6) and the grouting outer pipe (7), wherein the grouting hole group corresponds to a target soil layer; opening a tension fixing barrier (16) between the grouting outer pipe (7) and the grouting inner pipe (6) to enable microbial liquid to flow to a soil layer to be treated only through a grouting hole group (9) corresponding to a target area;
connecting a pulp supply system; one end of the PE hose (3) is placed at the bottom of the liquid reservoir (1) filled with microorganism liquid, and the other end of the PE hose (3) is connected with the grouting pipe through a pipeline adapter (5); an electromagnetic flowmeter (4) is arranged on the PE hose (3); adjusting the grouting pressure of the constant pressure water pump (2); opening a constant pressure water pump (2), and injecting a preset volume of microbial liquid into a target soil layer or a leakage area to be blocked through a grouting outer pipe (7), wherein the preset volume is determined by the total volume of pores of an area to be reinforced, so that the total volume of the pores of the area to be treated is not less than the total volume of the pores;
closing the constant pressure water pump (2); closing the electromagnetic valve (11) on the grouting inner pipe (6), and then sealing the grouting hole group (9) on the grouting inner pipe (6); closing a tension fixing barrier (16) above the opened grouting hole group (9) on the grouting inner pipe (6), and communicating the grouting outer pipe (7) with a grouting channel of a grouting pipe orifice; placing a PE hose (3) at the bottom of a liquid reservoir (1) filled with stationary liquid; opening the constant pressure water pump (2), and immediately injecting a preset volume of stationary liquid into the soil body; the fixing solution consists of 50mM calcium chloride solution; stopping grouting for 4h to ensure that the thalli are fully adsorbed in the stratum;
placing one end of a PE (polyethylene) hose (3) in a liquid reservoir (1) filled with a cementing liquid, and injecting a cementing liquid with a preset volume into a target area; the cementing liquid consists of 1M calcium chloride and urea; stopping grouting for 4 hours after each grouting is finished; circulating the grouting process for multiple times; under the action of microorganisms, biomineralization reaction can occur in the stratum to generate calcium carbonate, so that pores are filled, the soil strength is improved, and the soil permeability is reduced; opening a sound wave detector (17) in the whole grouting process, collecting sound waves reflected by a target area in real time, and evaluating the pore filling effect of the target area; the grouting operation is adjusted or stopped in time according to the evaluation result, so that excessive grouting or ineffective grouting is avoided;
after the target area is processed, closing the grouting hole group (9) corresponding to the target stratum, and opening the grouting hole group (9) corresponding to the other target stratum; and executing all the grouting operation steps until the layered grouting is finished.
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