CN110424449B - Microorganism control method for long-term stability of reinforced retaining wall - Google Patents
Microorganism control method for long-term stability of reinforced retaining wall Download PDFInfo
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- CN110424449B CN110424449B CN201910639538.XA CN201910639538A CN110424449B CN 110424449 B CN110424449 B CN 110424449B CN 201910639538 A CN201910639538 A CN 201910639538A CN 110424449 B CN110424449 B CN 110424449B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0225—Retaining or protecting walls comprising retention means in the backfill
- E02D29/0241—Retaining or protecting walls comprising retention means in the backfill the retention means being reinforced earth elements
Abstract
The invention relates to a reinforced earth retaining wall and a microorganism control method for long-term stability thereof, wherein the reinforced earth retaining wall comprises a reinforced earth structure, a pipeline structure and a detection structure, the reinforced earth structure comprises a plurality of transverse filling layers and geogrids arranged between the two filling layers, the pipeline structure comprises a plurality of guide pipes longitudinally penetrating through the whole reinforced earth structure, holes are formed in the guide pipes, plugs are arranged at the tops of the guide pipes, geotechnical cloth is wrapped at the peripheries of the guide pipes, the detection structure comprises sensors arranged between the guide pipes and used for detecting stress strain of the geogrids, gravel drainage layers are arranged on three surfaces of a wall surface, a wall back and a base of the reinforced earth structure, the geotechnical cloth is arranged between the gravel drainage layers and the reinforced earth structure, and a wall panel is arranged on the outer side of the gravel drainage layer positioned. The method has the advantages of simple construction and short construction period, organically combines the reinforced soil, the microorganism reinforcement and the monitoring system together, is green and environment-friendly, and can regulate and control the long-term stability of the reinforced retaining wall.
Description
Technical Field
The invention belongs to the technical field of geotechnical engineering, and particularly relates to a reinforced retaining wall and a long-term stability microbial control method thereof.
Background
The reinforced retaining wall is characterized in that a certain tension material (namely a tie bar) is embedded in a soil body, the tension stress in the soil body is transmitted to the adjacent tie bar through the interface friction action between the soil and the tie bar, and the method is equivalent to applying a lateral pressure increment to the soil body so as to limit the lateral displacement of the soil body. The reinforced retaining wall utilizes the frictional resistance between the soil body and the tie bars, and the tension between the tie bars and the panel forms an internal force stabilizing system, so that the soil body is changed from a traditional non-tensioned material into a composite material, and the strength and the stability of the soil body are improved. The reinforced retaining wall belongs to a flexible structure, and has the advantages of simple and quick construction, low cost, land saving, good adaptability to soft foundation, good deformation bearing capacity, good shock resistance and the like. When the length of the tie bar is insufficient or the friction between the tie bar and the surrounding soil body is too small, the damage form that the tie bar is pulled out can occur, so that the integral instability of the reinforced retaining wall is caused, the internal force exertion condition of the bar materials in the reinforced retaining wall needs to be monitored for a long time, and the long-term safety stability of the reinforced retaining wall is guaranteed. In addition, in order to save the earth cost or limit the space of a site under a plurality of working conditions, the reinforced retaining wall needs to be built in the limited space, the length of the tie bar at the moment often does not meet the design requirement, and the tie bar is easy to be pulled out to be damaged.
Whether the drainage treatment of the retaining wall is proper or not directly influences the safety and stability of the retaining wall. Therefore, the retaining wall should be provided with a drainage facility to dredge water in the filler behind the wall, prevent surface water from seeping into ponding behind the wall, thereby lead to the shear strength reduction of retaining wall banket, the soil pressure increase, the frost heaving pressure of filler in seasonally frozen region can be reduced in the drainage simultaneously, guarantees the safety and stability of retaining wall. Therefore, it is very important to improve the drainage ability of the reinforced retaining wall.
In the last decade, geotechnical engineering issues related to microorganisms have received increasing research attention. The exploration in the field can expand the range of the geotechnical engineering theory and enrich the research means. More importantly, the microbial process can be controlled and utilized as a technical means to solve specific engineering problems.
The microbial grouting reinforcement technology is a novel soil body reinforcement method developed in recent years, and is characterized in that microbial liquid and nutrient salt are poured into loose soil bodies, gel with a cementing effect is rapidly generated among soil particles by utilizing the mineralization effect of microbes, the soil bodies are cemented, the soil body cohesive force is improved, and the physical and mechanical properties of the soil bodies are improved. The microorganism slurry is a solution or a suspension, and the microorganism reinforcing technology has the advantages of small construction disturbance, small grouting pressure, low viscosity of the grouting liquid, adjustable reaction rate, high permeability, controllable cementing strength, environmental friendliness, good ecological compatibility and the like.
Disclosure of Invention
In order to solve the problems, the invention provides a reinforced retaining wall and a microorganism control method for long-term stability of the reinforced retaining wall, which utilize microorganism slurry to reinforce, provide larger pulling force, ensure the exertion of the pulling force in the retaining wall and ensure the long-term stability of the reinforced retaining wall.
In order to achieve the purpose, the technical scheme of the invention is as follows:
as shown in fig. 1, 2 and 3, a reinforced earth retaining wall comprises a reinforced earth structure, a pipeline structure and a detection structure, wherein the reinforced earth structure comprises a plurality of transverse filling layers 12 and a geogrid 5 arranged between two filling layers, the pipeline structure comprises a plurality of guide pipes 1 longitudinally penetrating through the whole reinforced earth structure, holes 13 which are uniformly distributed are formed in the guide pipes 1, plugs 4 are arranged at the tops of the guide pipes 1, a geotextile 11 is wrapped at the periphery of the guide pipes 1, the detection structure comprises a sensor 6 which is arranged between the guide pipes 1 and is used for detecting the stress strain of the geogrid, gravel drainage layers 10 are arranged on three surfaces of a wall surface, a wall back and a base of the reinforced earth structure, the geotextile 11 is arranged between the gravel drainage layers 10 and the reinforced earth structure, a wall panel 7 is arranged on the outer side of the gravel drainage layer 10 positioned on the wall surface of the reinforced earth structure, and a panel, and a drainage ditch 9 is arranged at the toe of the reinforced retaining wall.
In the technical scheme, the guide pipes 1 are distributed on the plane of the retaining wall at intervals in a quincuncial pile shape, and the horizontal distance is 1-2 m.
Further, the guide pipe 1 comprises a plurality of short pipes with the same length, the adjacent short pipes are connected through a connecting pipe 2, the connecting pipe 2 is located at the position of the geogrid 5, and the outer diameter of the connecting pipe 2 is smaller than the grid width of the geogrid 5.
Furthermore, the material of the conduit 1, the connecting pipe 2, the conduit base 3 and the plug 4 is PVC or PE, the outer diameter of the conduit 1 is 20-30mm, and the wall thickness is 2-3 mm.
Furthermore, the aperture of the hole 13 is 3-5mm, the distance between the longitudinal holes is 100-300mm, and 4-6 holes are circumferentially arranged at the same height of the conduit 1.
Further, the bottom of the conduit 1 is connected with a conduit base 3, and the conduit base 3 and the bottom geotextile 11 are fixed by glue.
Further, the sensors 6 are flexible displacement meters or resistance strain gauges, the sensors 6 are arranged on a longitudinal plane containing the guide pipe 1 in a quincuncial pile type alternate mode, and the sensors are arranged at intervals of 1-3 filling layers 12.
Further, the thickness of the crushed stone drainage layer 10 is not less than 300 mm.
A microorganism control method for long-term stability of a reinforced retaining wall comprises the following steps:
(1) leveling a field, paving a gravel drainage layer 10 and geotextile 11 at the position and behind a retaining wall to be built, fixing a conduit base 3 according to the designed position, installing a bottom conduit 1, filling a filling layer 12, and paving a geogrid 5;
(2) installing the next section of guide pipe 1 through the connecting pipe 2, backfilling a layer of filling layer 12 again, and laying a layer of geogrid 5;
(3) repeating the step 1 and the step 2 until the earth retaining wall is paved to the designed elevation, and synchronously installing a wall panel 7, a front gravel drainage layer 10, geotextile 11 and a matched sensor 6 when each layer of geogrid 5 is paved;
(4) the strength exertion situation of the reinforcement is evaluated according to the data transmitted to the monitoring equipment by the sensor 6, when the strength weakening phenomenon occurs at a certain position, the microorganism slurry 17 is used for grouting and reinforcing the specified position in the conduit 1, and the concentration and grouting times of the grouting slurry can be dynamically adjusted according to the restoration situation of the strength exertion of the reinforcement after the primary grouting and reinforcement.
As shown in fig. 4, in step 4, the grouting reinforcement method includes: a long thin rod 14 connected with a rubber plug 16 is sleeved in the sleeve 15, and the rubber plug 16 is plugged in the sleeve 15 to form a drawing device; the bottom of the drawing device is led to the lower end of the position to be reinforced, the long and thin rod 14 is used for ejecting the rubber plug 16 in the sleeve 15 to plug the section of the conduit 1; injecting microorganism slurry 17 from the annular gap between the sleeve 15 and the guide pipe 1 for grouting reinforcement; after the grouting is finished, the rubber stopper 16 is pulled back into the sleeve 15, and the whole pulling device is retracted simultaneously.
Advantageous effects
The method has the advantages of simple construction and short construction period, organically combines the reinforced soil, the microorganism reinforcement and the monitoring system together, is green, environment-friendly, economical and multipurpose, and can regulate and control the long-term stability of the reinforced retaining wall.
In the technical scheme, a plurality of guide pipes with holes and monitoring equipment are longitudinally arranged on a soil filling layer, the internal force exertion condition of the tie bars is monitored for a long time, when an overlarge bar material internal force weakening phenomenon appears at a certain position, the microorganism slurry reinforcement technology is utilized to inject microorganism reinforcement treatment liquid into the corresponding position of the retaining wall through the guide pipes pre-buried in the retaining wall, a microorganism cementing body is formed, the surrounding soil body is reinforced, the friction effect of the tie bars and the surrounding soil body is enhanced, and the stability of the retaining wall is improved. Compared with the traditional soil retaining wall, the novel reinforced soil retaining wall can provide larger pull-out resistance, ensures the exertion of the pull force of the pull bar in the retaining wall, and ensures the long-term stability of the reinforced soil retaining wall.
In the technical scheme, the drainage channel formed by the guide pipe is communicated with the gravel drainage layer at the bottom of the retaining wall when no grouting is performed, so that the overall drainage performance of the retaining wall can be enhanced, the stability of the retaining wall is improved, and the effect of one pipe for multiple purposes is achieved.
In the technical scheme, in the microbial reinforcement process, the concentration and grouting times of the reinforcement treatment liquid can be dynamically controlled according to the weakening degree of the internal force of the reinforcement material, wherein the utilized microbial slurry reinforcement technology is the natural biological reaction of microbes, is a process existing in the natural environment, particularly the ecological environment of a soil body, and has small influence on the environment and is more environment-friendly compared with the traditional grouting method.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a structural side view of the reinforced retaining wall of the present invention;
FIG. 2 is a top view of the structure of the reinforced retaining wall of the present invention;
FIG. 3 is a schematic view of the structure and connection of the conduit, connecting tube, plug, and base of the present invention;
fig. 4 is a structural diagram and a grouting schematic diagram of the long and thin rod, the sleeve and the rubber plug.
In the drawings:
1. conduit 2, connecting pipe 3, conduit base 4 and plug
5. Geogrid 6, sensor 7, shingle nail 8, panel basis
9. Drainage ditch 10, gravel drainage layer 11, geotextile 12 and fill layer
13. Hole 14, long and thin rod 15, sleeve 16 and rubber plug
17. Microbial slurry
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following 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.
Example 1:
a reinforced earth retaining wall comprises a reinforced earth structure, a pipeline structure and a detection structure, wherein the reinforced earth structure comprises a plurality of transverse filling layers 12 and geogrids 5 arranged between two filling layers, the pipeline structure comprises a plurality of guide pipes 1 longitudinally penetrating through the whole reinforced earth structure, holes 13 which are uniformly distributed are formed in the guide pipes 1, plugs 4 are arranged at the tops of the guide pipes 1, geotechnical cloth 11 is wrapped at the peripheries of the guide pipes 1, the detection structure comprises a sensor 6 for detecting the stress strain of the geogrids arranged between the guide pipes 1 and a wall surface of the reinforced earth structure, the back of a wall and trilateral rubble drainage blanket 10 that is provided with of basement, be provided with geotechnological cloth 11 between rubble drainage blanket 10 and the reinforced earth structure, the outside that is located the rubble drainage blanket 10 of reinforced earth structure wall is provided with shingle nail 7, and shingle nail 7 bottom is provided with panel basis 8, and the toe department of reinforced earth barricade is provided with escape canal 9.
The guide pipes 1 are distributed on the plane of the retaining wall in a quincuncial pile type alternate distribution, and the horizontal distance is 1 m.
The guide pipe 1 comprises a plurality of short pipes with the same length, the adjacent short pipes are connected through a connecting pipe 2, the connecting pipe 2 is located at the position of the geogrid 5, and the outer diameter of the connecting pipe 2 is smaller than the grid width of the geogrid 5.
The material of pipe 1, connecting pipe 2, pipe base 3 and stopper 4 is PVC, and the external diameter of pipe 1 is 20mm, and the wall thickness is 3 mm.
The aperture of the holes 13 is 3mm, the distance between the longitudinal holes is 100mm, and 6 holes are arranged in the circumferential direction at the same height of the conduit 1.
The bottom of the conduit 1 is connected with a conduit base 3, and the conduit base 3 and the bottom geotextile 11 are fixed through glue.
The sensors 6 are flexible displacement meters or resistance strain gauges, the sensors 6 are alternately arranged on a longitudinal plane containing the guide pipe 1 in a quincuncial pile shape, and one sensor is arranged at intervals of 1-3 filling layers 12.
The thickness of the macadam drainage layer 10 is not less than 320 mm.
A microorganism control method for long-term stability of a reinforced retaining wall comprises the following steps:
(1) leveling a field, paving a gravel drainage layer 10 and geotextile 11 at the position and behind a retaining wall to be built, fixing a conduit base 3 according to the designed position, installing a bottom conduit 1, filling a filling layer 12, and paving a geogrid 5;
(2) installing the next section of guide pipe 1 through the connecting pipe 2, backfilling a layer of filling layer 12 again, and laying a layer of geogrid 5;
(3) repeating the step 1 and the step 2 until the earth retaining wall is paved to the designed elevation, and synchronously installing a wall panel 7, a front gravel drainage layer 10, geotextile 11 and a matched sensor 6 when each layer of geogrid 5 is paved;
(4) the strength exertion situation of the reinforcement is evaluated according to the data transmitted to the monitoring equipment by the sensor 6, when the strength weakening phenomenon occurs at a certain position, the microorganism slurry 17 is used for grouting and reinforcing the specified position in the conduit 1, and the concentration and grouting times of the grouting slurry can be dynamically adjusted according to the restoration situation of the strength exertion of the reinforcement after the primary grouting and reinforcement.
In step 4, the grouting reinforcement method comprises the following steps: a long thin rod 14 connected with a rubber plug 16 is sleeved in the sleeve 15, and the rubber plug 16 is plugged in the sleeve 15 to form a drawing device; the bottom of the drawing device is led to the lower end of the position to be reinforced, the long and thin rod 14 is used for ejecting the rubber plug 16 in the sleeve 15 to plug the section of the conduit 1; injecting microorganism slurry 17 from the annular gap between the sleeve 15 and the guide pipe 1 for grouting reinforcement; after the grouting is finished, the rubber stopper 16 is pulled back into the sleeve 15, and the whole pulling device is retracted simultaneously.
Example 2:
a reinforced earth retaining wall comprises a reinforced earth structure, a pipeline structure and a detection structure, wherein the reinforced earth structure comprises a plurality of transverse filling layers 12 and geogrids 5 arranged between two filling layers, the pipeline structure comprises a plurality of guide pipes 1 longitudinally penetrating through the whole reinforced earth structure, holes 13 which are uniformly distributed are formed in the guide pipes 1, plugs 4 are arranged at the tops of the guide pipes 1, geotechnical cloth 11 is wrapped at the peripheries of the guide pipes 1, the detection structure comprises a sensor 6 for detecting the stress strain of the geogrids arranged between the guide pipes 1 and a wall surface of the reinforced earth structure, the back of a wall and trilateral rubble drainage blanket 10 that is provided with of basement, be provided with geotechnological cloth 11 between rubble drainage blanket 10 and the reinforced earth structure, the outside that is located the rubble drainage blanket 10 of reinforced earth structure wall is provided with shingle nail 7, and shingle nail 7 bottom is provided with panel basis 8, and the toe department of reinforced earth barricade is provided with escape canal 9.
The guide pipes 1 are distributed on the plane of the retaining wall in a quincuncial pile type alternate distribution, and the horizontal distance is 1.5 m.
The guide pipe 1 comprises a plurality of short pipes with the same length, the adjacent short pipes are connected through a connecting pipe 2, the connecting pipe 2 is located at the position of the geogrid 5, and the outer diameter of the connecting pipe 2 is smaller than the grid width of the geogrid 5.
The material of pipe 1, connecting pipe 2, pipe base 3 and stopper 4 is PE, and the external diameter of pipe 1 is 25mm, and the wall thickness is 2.5 mm.
The aperture of the holes 13 is 4mm, the distance between the longitudinal holes is 200mm, and 5 holes are arranged in the circumferential direction at the same height of the guide pipe 1.
The bottom of the conduit 1 is connected with a conduit base 3, and the conduit base 3 and the bottom geotextile 11 are fixed through glue.
The sensors 6 are flexible displacement meters or resistance strain gauges, the sensors 6 are alternately arranged on a longitudinal plane containing the guide pipe 1 in a quincuncial pile shape, and one sensor is arranged at intervals of 1-3 filling layers 12.
The thickness of the gravel drainage layer 10 is not less than 340 mm.
A microorganism control method for long-term stability of a reinforced retaining wall comprises the following steps:
(1) leveling a field, paving a gravel drainage layer 10 and geotextile 11 at the position and behind a retaining wall to be built, fixing a conduit base 3 according to the designed position, installing a bottom conduit 1, filling a filling layer 12, and paving a geogrid 5;
(2) installing the next section of guide pipe 1 through the connecting pipe 2, backfilling a layer of filling layer 12 again, and laying a layer of geogrid 5;
(3) repeating the step 1 and the step 2 until the earth retaining wall is paved to the designed elevation, and synchronously installing a wall panel 7, a front gravel drainage layer 10, geotextile 11 and a matched sensor 6 when each layer of geogrid 5 is paved;
(4) the strength exertion situation of the reinforcement is evaluated according to the data transmitted to the monitoring equipment by the sensor 6, when the strength weakening phenomenon occurs at a certain position, the microorganism slurry 17 is used for grouting and reinforcing the specified position in the conduit 1, and the concentration and grouting times of the grouting slurry can be dynamically adjusted according to the restoration situation of the strength exertion of the reinforcement after the primary grouting and reinforcement.
In step 4, the grouting reinforcement method comprises the following steps: a long thin rod 14 connected with a rubber plug 16 is sleeved in the sleeve 15, and the rubber plug 16 is plugged in the sleeve 15 to form a drawing device; the bottom of the drawing device is led to the lower end of the position to be reinforced, the long and thin rod 14 is used for ejecting the rubber plug 16 in the sleeve 15 to plug the section of the conduit 1; injecting microorganism slurry 17 from the annular gap between the sleeve 15 and the guide pipe 1 for grouting reinforcement; after the grouting is finished, the rubber stopper 16 is pulled back into the sleeve 15, and the whole pulling device is retracted simultaneously.
Example 3:
a reinforced earth retaining wall comprises a reinforced earth structure, a pipeline structure and a detection structure, wherein the reinforced earth structure comprises a plurality of transverse filling layers 12 and geogrids 5 arranged between two filling layers, the pipeline structure comprises a plurality of guide pipes 1 longitudinally penetrating through the whole reinforced earth structure, holes 13 which are uniformly distributed are formed in the guide pipes 1, plugs 4 are arranged at the tops of the guide pipes 1, geotechnical cloth 11 is wrapped at the peripheries of the guide pipes 1, the detection structure comprises a sensor 6 for detecting the stress strain of the geogrids arranged between the guide pipes 1 and a wall surface of the reinforced earth structure, the back of a wall and trilateral rubble drainage blanket 10 that is provided with of basement, be provided with geotechnological cloth 11 between rubble drainage blanket 10 and the reinforced earth structure, the outside that is located the rubble drainage blanket 10 of reinforced earth structure wall is provided with shingle nail 7, and shingle nail 7 bottom is provided with panel basis 8, and the toe department of reinforced earth barricade is provided with escape canal 9.
The guide pipes 1 are distributed on the plane of the retaining wall in a quincuncial pile type alternate distribution, and the horizontal distance is 2 m.
The guide pipe 1 comprises a plurality of short pipes with the same length, the adjacent short pipes are connected through a connecting pipe 2, the connecting pipe 2 is located at the position of the geogrid 5, and the outer diameter of the connecting pipe 2 is smaller than the grid width of the geogrid 5.
The material of pipe 1, connecting pipe 2, pipe base 3 and stopper 4 is PVC, and the external diameter of pipe 1 is 30mm, and the wall thickness is 2 mm.
The aperture of the holes 13 is 5mm, the distance between the longitudinal holes is 300mm, and 4 holes are arranged in the circumferential direction at the same height of the catheter 1.
The bottom of the conduit 1 is connected with a conduit base 3, and the conduit base 3 and the bottom geotextile 11 are fixed through glue.
The sensors 6 are flexible displacement meters or resistance strain gauges, the sensors 6 are alternately arranged on a longitudinal plane containing the guide pipe 1 in a quincuncial pile shape, and one sensor is arranged at intervals of 1-3 filling layers 12.
The thickness of the macadam drainage layer 10 is not less than 350 mm.
A microorganism control method for long-term stability of a reinforced retaining wall comprises the following steps:
(1) leveling a field, paving a gravel drainage layer 10 and geotextile 11 at the position and behind a retaining wall to be built, fixing a conduit base 3 according to the designed position, installing a bottom conduit 1, filling a filling layer 12, and paving a geogrid 5;
(2) installing the next section of guide pipe 1 through the connecting pipe 2, backfilling a layer of filling layer 12 again, and laying a layer of geogrid 5;
(3) repeating the step 1 and the step 2 until the earth retaining wall is paved to the designed elevation, and synchronously installing a wall panel 7, a front gravel drainage layer 10, geotextile 11 and a matched sensor 6 when each layer of geogrid 5 is paved;
(4) the strength exertion situation of the reinforcement is evaluated according to the data transmitted to the monitoring equipment by the sensor 6, when the strength weakening phenomenon occurs at a certain position, the microorganism slurry 17 is used for grouting and reinforcing the specified position in the conduit 1, and the concentration and grouting times of the grouting slurry can be dynamically adjusted according to the restoration situation of the strength exertion of the reinforcement after the primary grouting and reinforcement.
In step 4, the grouting reinforcement method comprises the following steps: a long thin rod 14 connected with a rubber plug 16 is sleeved in the sleeve 15, and the rubber plug 16 is plugged in the sleeve 15 to form a drawing device; the bottom of the drawing device is led to the lower end of the position to be reinforced, the long and thin rod 14 is used for ejecting the rubber plug 16 in the sleeve 15 to plug the section of the conduit 1; injecting microorganism slurry 17 from the annular gap between the sleeve 15 and the guide pipe 1 for grouting reinforcement; after the grouting is finished, the rubber stopper 16 is pulled back into the sleeve 15, and the whole pulling device is retracted simultaneously.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (8)
1. A microorganism control method for long-term stability of a reinforced retaining wall is characterized by comprising the following steps: the reinforced earth retaining wall comprises a reinforced earth structure, a pipeline structure and a detection structure, wherein the reinforced earth structure comprises a plurality of transverse filling layers (12) and geogrids (5) arranged between two filling layers, the pipeline structure comprises a plurality of pipes (1) which vertically penetrate through the whole reinforced earth structure, holes (13) which are uniformly distributed are formed in the pipes (1), a plug (4) is arranged at the top of each pipe (1), geotextile (11) is wrapped at the periphery of each pipe (1), microorganism slurry (17) can be used for grouting reinforcement of the reinforced earth retaining wall at an appointed position in each pipe (1), the detection structure comprises a sensor (6) which is arranged between the pipes (1) and is used for detecting the stress strain of the geogrids, and drainage layers (10) are arranged on the wall surface, the wall back and the base of the reinforced earth structure on three sides, a geotextile (11) is arranged between the gravel drainage layer (10) and the reinforced earth structure, a wall panel (7) is arranged on the outer side of the gravel drainage layer (10) on the wall surface of the reinforced earth structure, a panel foundation (8) is arranged at the bottom of the wall panel (7), and a drainage ditch (9) is arranged at the toe of the reinforced earth retaining wall;
the microorganism control method for the long-term stability of the reinforced retaining wall comprises the following steps:
(1) leveling a field, paving a gravel drainage layer (10) and geotextile (11) at the position and behind a retaining wall to be built, fixing a guide pipe base (3) according to the designed position, installing a bottom guide pipe (1), filling a filling layer (12), and paving a geogrid (5);
(2) installing the next section of guide pipe (1) through the connecting pipe (2), backfilling a layer of filling layer (12) again, and laying a layer of geogrid (5);
(3) repeating the step (1) and the step (2) until the earth retaining wall is paved to the designed elevation, and synchronously installing a wall panel (7), a front gravel drainage layer (10), geotextile (11) and a matched sensor (6) when each layer of geogrid (5) is paved;
(4) evaluating the internal force exertion condition of the reinforcement according to data transmitted to monitoring equipment by a sensor (6), and when the internal force of the reinforcement is weakened at a certain position, grouting and reinforcing the specified position in the conduit (1) by using microbial grout (17), wherein the concentration and grouting times of the grouting liquid can be dynamically adjusted according to the restoration condition of the internal force exertion of the reinforcement after primary grouting and reinforcing; the grouting reinforcement method comprises the following steps: a long and thin rod (14) connected with a rubber plug (16) is sleeved in the sleeve (15), and the rubber plug (16) is plugged in the sleeve (15) to form a drawing device; the bottom of the drawing device is led to the lower end of a position to be reinforced, a long and thin rod (14) is used for ejecting a rubber plug (16) in a sleeve (15) to plug the section of the conduit (1); injecting microorganism slurry (17) from an annular gap between the sleeve (15) and the guide pipe (1) for grouting reinforcement; after the grouting is finished, the rubber plug (16) is pulled back into the sleeve (15), and the whole pulling device is withdrawn simultaneously.
2. The method of claim 1 for microbiological control of long term stability of a reinforced retaining wall, wherein: the guide pipes (1) are distributed on the plane of the retaining wall in a quincuncial pile type alternate distribution, and the horizontal distance is 1-2 m.
3. The method of claim 2 for microbiological control of long term stability of a reinforced retaining wall, wherein: the guide pipe (1) comprises a plurality of short pipes with the same length, the adjacent short pipes are connected through a connecting pipe (2), the connecting pipe (2) is located at the position of the geogrid (5), and the outer diameter of the connecting pipe (2) is smaller than the grid width of the geogrid (5).
4. The method of claim 3 for microbiological control of the long term stability of a reinforced retaining wall, wherein: the pipe (1), the connecting pipe (2), the pipe base (3) and the plug (4) are made of PVC or PE, the outer diameter of the pipe (1) is 20-30mm, and the wall thickness is 2-3 mm.
5. The method of claim 4 for microbiological control of long term stability of a reinforced retaining wall, wherein: the aperture of the hole (13) is 3-5mm, the distance between the longitudinal holes is 100-300mm, and 4-6 holes are arranged in the annular direction at the same height of the conduit (1).
6. The method of claim 5 for microbiological control of long term stability of a reinforced retaining wall, wherein: the bottom of the conduit (1) is connected with a conduit base (3), and the conduit base (3) and the bottom geotextile (11) are fixed through glue.
7. The method of claim 6 for microbiological control of long term stability of a reinforced retaining wall, wherein: the sensor (6) is a flexible displacement meter or a resistance strain gauge, the sensors (6) are alternately arranged on a longitudinal plane containing the guide pipe (1) in a quincuncial pile shape, and one filling layer (12) is arranged at intervals of 1-3 layers.
8. The method of claim 7 for microbiological control of long term stability of a reinforced retaining wall, wherein: the thickness of the gravel drainage layer (10) is not less than 300 mm.
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| CN113389210A (en) * | 2021-07-21 | 2021-09-14 | 重庆大学 | Landslide control method combining anti-sliding key and local point type reinforcement |
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| CN107780436A (en) * | 2017-09-26 | 2018-03-09 | 湖南大学 | Geogrid Reinforced Earth Retaining Wall and construction method based on architecture sediment |
| CN208816080U (en) * | 2018-09-13 | 2019-05-03 | 新汶矿业集团地质勘探有限责任公司 | A kind of same diameter casing antipriming of bored grouting |
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2019
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| CN1281083A (en) * | 1999-07-19 | 2001-01-24 | 扬州市勘测设计研究院土工新技术研究所 | Ribbed retaining wall |
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| KR20150074502A (en) * | 2013-12-24 | 2015-07-02 | (주)에스오씨산업 | Block-type reinforced earth retaining wall construction method and steel rod grid reinforcing material is installed |
| CN105649005A (en) * | 2016-01-27 | 2016-06-08 | 浙江大学 | Geogrid combined grouting electro-osmosis construction method for ultra-soft soil |
| CN106223348A (en) * | 2016-07-18 | 2016-12-14 | 河海大学 | A kind of microorganism GSZ associating reinforcement method |
| CN107780436A (en) * | 2017-09-26 | 2018-03-09 | 湖南大学 | Geogrid Reinforced Earth Retaining Wall and construction method based on architecture sediment |
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| CN110424449A (en) | 2019-11-08 |
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