Method for controlling differential settlement of large pool

Abstract

The invention discloses a method for controlling differential settlement of a large pool. The method comprises the following steps of: 1, pre-burying a pile foundation, namely pre-burying the pile foundation after geological exploration; 2, stabilizing a pile foundation; after the pile foundation is pre-buried, extending rods are inserted into the mounting holes, and then the extending rods penetrate through the mounting holes through hydraulic extrusion equipment and are inserted into a soil layer around the pile foundation; thirdly, pile foundation grouting is conducted, specifically, a reinforcement cage is hoisted into the pile foundation through hoisting equipment, and then grouting work is conducted; and 5, detecting optical fiber construction. The extension rods are additionally arranged in a traditional pile foundation, so that compared with a mode only depending on friction force, the pile foundation stability of the device can be greatly improved, the situation of uneven sedimentation of a large pool can be effectively prevented, meanwhile, the device is further provided with the optical fibers for detecting the sedimentation situation of the pool, and the device is convenient to use. And a worker can be timely notified to carry out maintenance when the pool settles.

Description

Technical Field

[0001] The invention relates to the technical field of sedimentation control, in particular to a method for controlling uneven sedimentation of a large water pool. Background Art

[0002] In the existing technology, when building a large water pool, it is necessary to consider the settlement of the water pool. Controlling the uneven settlement of a large water pool is the key to ensuring structural safety, normal function and service life. Large water pools are usually thin-walled reinforced concrete structures, which are extremely sensitive to uneven settlement of the foundation. Water pools are usually used to store water or other liquids and must have good sealing properties. Uneven settlement may cause cracks in the joints of the water pool, causing leakage and affecting the use function of the water pool. Uneven settlement will cause additional stress in the water pool structure, which may cause cracks, deformation and even overall damage. In the existing technology, the traditional solution is generally to use raft foundations or box foundations to increase the bottom area of the foundation, disperse the load and reduce the additional stress on the base. Alternatively, independent foundations or pile foundations are set up in local weak areas to enhance the foundation stiffness and control differential settlement.

[0003] However, such solutions in the prior art still have the following disadvantages:

[0004] 1. If there is still a risk of settlement during the construction of the pile foundation, the pile foundation can only rely on friction and friction between the foundation soil to prevent settlement, which is limited in effectiveness;

[0005] 2. Such uneven settlement control structures in the prior art cannot detect settlement in time, drain water in time and repair it in time, which can easily cause huge safety hazards. Therefore, a method for improving uneven settlement control of large water tanks is needed to address this problem. Summary of the Invention

[0006] The object of the present invention is to provide a method for controlling uneven sedimentation of a large water pool to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a large-scale water pool uneven settlement control structure; comprising a pile foundation, a steel cage cast inside the pile foundation, a water pool body cast on the upper end of the pile foundation through the steel cage, a plurality of mounting holes evenly fixed around the inside of the pile foundation, extension rods inserted inside the mounting holes so that they can be extended and inserted into the soil layer around the pile foundation to cooperate with the pile foundation to form a more solid foundation, and a connecting block fixed at one end of the extension rod.

[0008] A construction device for controlling uneven settlement of a large water pool; it includes a fixed frame, and a squeezing mechanism for squeezing an extension rod is provided on one side of the upper end of the fixed frame so that the extension rod is inserted into the soil layer around the pile foundation. The squeezing mechanism includes a slide rail, a slide table, an electric motor, a transmission rod, a sleeve, and a hydraulic cylinder. A slide rail is fixedly provided on one side of the upper end of the fixed frame, and a slider is movably sleeved on the outer surface of the slide rail. A motor is fixedly provided on the upper end of the slider surface, and a transmission rod is movably provided on the lower end of the slide table surface through a bearing, and a sleeve is fixedly provided on the end of the transmission rod away from the motor; a hydraulic cylinder is fixedly provided on one side of the upper end of the slide rail; a construction device matching this method is disclosed herein, so that the construction work of the extension rod can be facilitated.

[0009] Preferably, the power output shaft end of the motor is connected to the transmission rod through a coupling; the motor can drive the transmission rod to rotate, thereby driving the sleeve and the extension rod to rotate, so that the extension rod can be more easily inserted through the mounting hole into the soil layer around the pile foundation in conjunction with the extrusion of the hydraulic cylinder.

[0010] Preferably, the movable end of the hydraulic cylinder is fixedly connected to the slide, so that when the hydraulic cylinder is extended or retracted, the slide can be driven to slide along the slide rail; the extension of the hydraulic cylinder can push the slide along the slide rail, so that the extension rod can be squeezed through the mounting hole into the target position.

[0011] A method for controlling uneven sedimentation in a large water pool comprises the following steps:

[0012] The first step is pre-buried pile foundation. After geological exploration, the pile foundation is pre-buried. The pile diameter is 500mm. The pile length is determined according to the soil conditions in different areas. The length is 10 to 15m. The pile spacing is 1.2m and arranged in a square shape.

[0013] The second step is to stabilize the pile foundation. After the pile foundation is pre-buried, an extension rod is inserted into the installation hole. Then, a hydraulic extrusion device is used to push the extension rod through the installation hole and into the soil layer around the pile foundation. This allows the extension rod to be inserted around the pile foundation. This significantly improves the fixing effect of the pile foundation compared to the fixing method that relies solely on friction.

[0014] The third step is pile foundation grouting. The steel cage is hoisted into the pile foundation through the lifting equipment, and then the grouting work is carried out. The grouting material is cement and water glass double liquid slurry, and the grouting pressure is 0.5 to 1.5 MPa.

[0015] Step 4: Tank construction: Divide the sedimentation tank into 6 chambers, each with a plane size of 20m×20m. Set a 1000mm wide post-casting strip between adjacent chambers. Use the skipping method during construction, pouring concrete in chambers 1, 3, and 5 first, and then pouring concrete in chambers 2, 4, and 6 after a 10-day interval. 60 days after the concrete pouring on both sides is completed, the post-casting strip is poured with C40 slightly expansive concrete.

[0016] The fifth step involves installing a detection fiber. A detection fiber is laid along the perimeter of the sedimentation tank foundation using a combination of adhesive bonding and burial to ensure tight coupling with the surrounding medium. The detection principle is based on Brillouin optical time-domain analysis (BOTDA). The BOTDA system transmits two beams of light of different frequencies into the optical fiber: one serving as the pump light and the other as the probe light. When the frequency difference between the pump and probe lights equals the Brillouin frequency shift in the fiber, energy transfer occurs, generating Brillouin gain or loss. By measuring the Brillouin gain or loss at different locations, the strain at each point in the fiber can be determined. Since light takes time to propagate through an optical fiber, the system can determine the specific location of sedimentation based on the time it takes for light to reach different locations. Fiber is laid along the bottom of the tank, forming a sensing network. BOTDA equipment transmits pump and probe light and records the Brillouin gain or loss signals received at different time points. Based on the propagation speed and time of light in the fiber, the corresponding fiber position can be calculated, thereby pinpointing the specific location of sedimentation.

[0017] The power output shaft end of the motor is connected to the transmission rod through a coupling; the motor can drive the transmission rod to rotate, thereby driving the sleeve and the extension rod to rotate, so that the extension rod can be more easily inserted through the mounting hole into the soil layer around the pile foundation in conjunction with the extrusion of the hydraulic cylinder.

[0018] The movable end of the hydraulic cylinder is fixedly connected to the slide, so that when the hydraulic cylinder is extended or retracted, the slide can be driven to slide along the slide rail; the extension of the hydraulic cylinder can push the slide along the slide rail, so that the extension rod can be squeezed through the mounting hole into the target position.

[0019] Preferably, in the first step, pre-embedding of the pile foundation, it is necessary to monitor the verticality of the pile in real time, and use a theodolite to measure, and the verticality deviation is controlled within 1%; monitor the pile diameter, and use a steel ruler to measure, and the pile diameter deviation is controlled within ±20mm; monitor the pile length, and use the drill rod length marking method, and the pile length deviation is controlled within ±100mm, and piles that do not meet the requirements are promptly supplemented.

[0020] Preferably, in the fourth step, during the construction of the water pool, when pouring the post-cast strip, the concrete surface on both sides needs to be roughened to a depth of 5-10 mm, the floating slurry and debris need to be removed, and the surface needs to be rinsed with water and kept moist for 24 hours. When pouring, an inserted vibrator is used to vibrate and compact the surface for 20-30 seconds to ensure good bonding between the post-cast strip and the concrete on both sides.

[0021] Preferably, in the fifth step, during the construction of the detection optical fiber, the optical fiber is pasted on a pre-laid 100 mm thick C15 concrete cushion at the bottom of the pool and protected with a 50 mm thick C20 fine stone concrete; inside the pool wall, the optical fiber is buried in a concrete protective layer with a thickness of 30 mm, and a steel support is used to fix the optical fiber to prevent it from shifting. Subsequently, a data acquisition system is established, and a distributed optical fiber demodulator is used for data acquisition with a sampling frequency of 1 Hz. The data of the optical fiber sensor is collected in real time and transmitted to a data processing center for analysis. By establishing a settlement model, the strain data of the optical fiber is converted into actual settlement values.

[0022] Preferably, in the fifth step, during the optical fiber detection construction, when the optical fiber detection construction is completed and a sudden increase in the settlement rate in a certain area is detected, the foundation of the area should be grouting reinforced in time. The grouting material is cement-water glass double liquid slurry, the water-cement ratio of the cement slurry is 0.8, the modulus of the water glass is 2.8, and the volume ratio of the cement slurry to the water glass is 1:0.6. The grouting pressure is 1.0-1.5MPa, and the grouting volume and pressure changes are monitored in real time during the grouting process. A total of 30-50m 3 , which can effectively control the development of settlement.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention can greatly improve the stability of the pile foundation of the device by adding an extension rod to the pile foundation, compared with the method of relying solely on friction, thereby effectively preventing the occurrence of uneven settlement of large water pools. The extension rod improves the bearing capacity and uniformity of the pile foundation, reducing the occurrence of uneven settlement from the source.

[0025] 2. This invention incorporates fiber-optic settlement detection, which offers advantages such as high precision, strong real-time performance, and excellent anti-interference capabilities. It can accurately monitor settlement conditions in various parts of the pool, promptly identifying potential uneven settlement issues and providing an accurate basis for taking corrective measures. Compared to traditional settlement monitoring methods, fiber-optic settlement detection enables distributed and continuous monitoring, providing a more comprehensive picture of the pool's settlement distribution.

[0026] 3. The compartmentalized design and construction method of the present invention effectively reduces the planar dimensions of individual compartments, mitigating the impact of uneven foundation deformation. The use of post-cast strips and the skip-compartment method reduces cracks and uneven settlement caused by concrete shrinkage, improving the integrity of the tank structure. The compartmentalized design allows the tank structure to better adapt to uneven foundation deformation, while the post-cast strips and skip-compartment method effectively relieve concrete shrinkage stress, preventing the formation and development of cracks. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of a large-scale water tank uneven settlement control structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the overall structure of a large-scale water tank uneven settlement control construction device of the present invention;

[0029] Figure 3 For the present invention Figure 2 Side view of

[0030] Figure 4 The present invention is a flowchart of the construction steps of a method for controlling uneven sedimentation of a large water pool.

[0031] In the figure: 1. Pile foundation; 2. Steel cage; 3. Pool body; 4. Mounting hole; 5. Extension rod; 6. Connecting block; 7. Detection optical fiber; 8. Transmission optical fiber; 9. Detection instrument; 10. Fixed frame; 11. Slide rail; 12. Slide; 13. Motor; 14. Transmission rod; 15. Sleeve; 16. Hydraulic cylinder. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] See also Figure 1-4 The present invention provides a technical solution: a large-scale water pool uneven settlement control structure; comprising a pile foundation 1, a steel cage 2 is cast inside the pile foundation 1, a water pool body 3 is cast on the upper end of the pile foundation 1 through the steel cage 2, a plurality of mounting holes 4 are evenly fixed around the inside of the pile foundation 1, an extension rod 5 is inserted into the mounting hole 4, so that it can be extended and inserted into the soil layer around the pile foundation 1 to cooperate with the pile foundation 1 to form a more solid foundation, a connecting block 6 is fixed at one end of the extension rod 5, a detection optical fiber 7 is provided at the lower end of the water pool body 3, a transmission optical fiber 8 is provided on one side of the detection optical fiber 7, and a detection instrument 9 is provided at one end of the transmission optical fiber 8.

[0034] A construction device for controlling uneven settlement of a large water pool; it includes a fixed frame 10, and a squeezing mechanism for squeezing an extension rod 5 is provided on one side of the upper end of the fixed frame 10 so that the extension rod 5 is inserted into the soil layer around the pile foundation 1. The squeezing mechanism includes a slide rail 11, a slide table 12, a motor 13, a transmission rod 14, a sleeve 15, and a hydraulic cylinder 16. The slide rail 11 is fixedly provided on one side of the upper end of the fixed frame 10, and a slider is movably sleeved on the outer surface of the slide rail 11. The upper end of the slider is fixedly provided with a motor 13, and the lower end of the slide table 12 is movably provided with a transmission rod 14 through a bearing. The end of the transmission rod 14 away from the motor 13 is fixedly provided with a sleeve 15; the upper end of the slide rail 11 is fixedly provided with a hydraulic cylinder 16; a construction device matched with the present method is disclosed herein, so that the construction work of the extension rod 5 can be facilitated;

[0035] The power output shaft end of the motor 13 is connected to the transmission rod 14 through a coupling; the motor 13 can drive the transmission rod 14 to rotate, thereby driving the sleeve 15 and the extension rod 5 to rotate. In this way, the extension rod 5 can be more easily inserted through the mounting hole 4 into the soil layer around the pile foundation 1 by the extrusion of the hydraulic cylinder 16;

[0036] The movable end of the hydraulic cylinder 16 is fixedly connected to the slide 12 so that when the hydraulic cylinder 16 is extended or retracted, the slide 12 can be driven to slide along the slide rail 11; the extension of the hydraulic cylinder 16 can push the slide 12 to move along the slide rail 11, so that the extension rod 5 can be squeezed through the mounting hole 4 into the target position.

[0037] A method for controlling uneven sedimentation in a large water pool comprises the following steps:

[0038] The first step is to pre-buried pile foundations. After geological exploration, pile foundation 1 is pre-buried. The pile diameter is 500mm. The pile length is determined according to the soil conditions in different areas. The length is 10 to 15m. The pile spacing is 1.2m and the piles are arranged in a square shape.

[0039] The second step is to stabilize the pile foundation. After the pile foundation 1 is pre-buried, an extension rod 5 is inserted into the installation hole 4. Then, the extension rod 5 is inserted through the installation hole 4 by a hydraulic extrusion device and inserted into the soil layer around the pile foundation 1. In this way, the extension rod 5 is inserted around the pile foundation 1. This significantly improves the fixing effect of the pile foundation 1 compared to the fixing method that relies solely on friction.

[0040] The third step is pile foundation grouting. The steel cage 2 is hoisted into the pile foundation 1 through the lifting equipment, and then the grouting work is carried out. The grouting material is cement and water glass double liquid slurry, and the grouting pressure is 0.5 to 1.5 MPa.

[0041] Step 4: Tank construction: Divide the sedimentation tank into 6 chambers, each with a plane size of 20m×20m. Set a 1000mm wide post-casting strip between adjacent chambers. Use the skipping method during construction, pouring concrete in chambers 1, 3, and 5 first, and then pouring concrete in chambers 2, 4, and 6 after a 10-day interval. 60 days after the concrete pouring on both sides is completed, the post-casting strip is poured with C40 slightly expansive concrete.

[0042] Step 5: Fiber optic detection installation. A fiber optic detection system (7) is installed along the perimeter of the sedimentation tank foundation. The fiber is secured using a combination of adhesive bonding and burial to ensure tight coupling with the surrounding medium. The detection principle is based on Brillouin optical time-domain analysis (BOTDA). The BOTDA system transmits two beams of light of different frequencies into an optical fiber: one serving as pump light and the other as probe light. When the frequency difference between the pump and probe light equals the Brillouin frequency shift in the fiber, energy transfer occurs, generating Brillouin gain or loss. By measuring the Brillouin gain or loss at different locations, the strain at each point in the fiber can be determined. Since light takes time to propagate through an optical fiber, the system can determine the specific location of sedimentation based on the time it takes for light to reach different locations. Fiber optic sensors are laid along the bottom of the tank, forming a sensing network. BOTDA equipment transmits pump and probe light and records the Brillouin gain or loss signals received at different time points. Based on the propagation speed and time of light in the fiber, the fiber position corresponding to the signal can be calculated, thereby determining the specific location of sedimentation.

[0043] In the first step, during the pre-embedding of the pile foundation 1, the verticality of the pile needs to be monitored in real time. The verticality deviation is controlled within 1% by using a theodolite; the pile diameter is monitored by using a steel ruler, and the pile diameter deviation is controlled within ±20mm; the pile length is monitored by using the drill rod length marking method, and the pile length deviation is controlled within ±100mm. Piles that do not meet the requirements are promptly supplemented;

[0044] In the fourth step, during the construction of the pool, when pouring the post-cast strip, it is necessary to roughen the concrete surface on both sides to a depth of 5-10 mm, remove the slurry and debris, and rinse with water, keep it moist for 24 hours, and when pouring, use an inserted vibrator to vibrate and compact it for 20-30 seconds to ensure good bonding between the post-cast strip and the concrete on both sides;

[0045] The fifth step, the detection optical fiber 7 is under construction; the optical fiber is pasted on the pre-laid 100mm thick C15 concrete cushion at the bottom of the pool and protected with 50mm thick C20 fine stone concrete; inside the pool wall, the optical fiber is buried in the concrete protective layer with a thickness of 30mm, and the optical fiber is fixed with a steel support to prevent the optical fiber from shifting. Subsequently, a data acquisition system is established, and a distributed optical fiber demodulator is used for data acquisition with a sampling frequency of 1Hz. The data of the optical fiber sensor is collected in real time and transmitted to the data processing center for analysis. By establishing a settlement model, the strain data of the optical fiber is converted into actual settlement values;

[0046] During the fifth step, when the optical fiber detection construction is completed and a sudden increase in the settlement rate in a certain area is detected, the foundation of the area should be grouting reinforced in time. The grouting material is cement-water glass double slurry, the water-cement ratio of the cement slurry is 0.8, the modulus of water glass is 2.8, and the volume ratio of cement slurry to water glass is 1:0.6. The grouting pressure is 1.0-1.5MPa. The grouting volume and pressure changes are monitored in real time during the grouting process. A total of 30-50m 3 , which can effectively control the development of settlement.

[0047] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0048] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A large-scale water pool uneven settlement control structure, comprising a pile foundation (1), characterized in that: A steel cage (2) is cast inside the pile foundation (1), and a pool body (3) is cast on the upper end of the pile foundation (1) through the steel cage (2). Several mounting holes (4) are evenly and fixedly arranged around the inside of the pile foundation (1). An extension rod (5) is inserted into the mounting hole (4) so as to extend and insert into the soil layer around the pile foundation (1) to form a more solid foundation for the pile foundation (1). A connecting block (6) is fixed at one end of the extension rod (5). A detection optical fiber (7) is provided at the lower end of the pool body (3), a transmission optical fiber (8) is provided on one side of the detection optical fiber (7), and a detection instrument (9) is provided at one end of the transmission optical fiber (8).

2. A large-scale water pool uneven settlement control construction device according to claim 1, comprising a fixed frame (10), characterized in that: A squeezing mechanism for squeezing the extension rod (5) so that the extension rod (5) is inserted into the soil layer around the pile foundation (1) is provided on one side of the upper end of the fixed frame (10). The squeezing mechanism comprises a slide rail (11), a slide table (12), a motor (13), a transmission rod (14), a sleeve (15), and a hydraulic cylinder (16). A slide rail (11) is fixedly provided on one side of the upper end of the fixed frame (10). A slider is movably sleeved on the outer surface of the slide rail (11). The upper end of the slider is fixedly provided with a motor (13). A transmission rod (14) is movably provided on the lower end of the slide table (12) via a bearing. A sleeve (15) is fixedly provided on the end of the transmission rod (14) away from the motor (13). The upper end of the slide rail (11) is fixedly provided with a hydraulic cylinder (16).

3. A large-scale water pool uneven settlement control construction device according to claim 2, characterized in that: The power output shaft end of the motor (13) is connected to the transmission rod (14) through a coupling.

4. A large-scale water pool uneven settlement control construction device according to claim 2, characterized in that: The movable end of the hydraulic cylinder (16) is fixedly connected to the slide (12), so that when the hydraulic cylinder (16) is extended or retracted, the slide (12) can be driven to slide with the slide rail (11).

5. A method for controlling uneven sedimentation in a large water pool according to claims 1-4, comprising the following steps, characterized in that: The first step is pre-buried pile foundation. After geological exploration, the pile foundation is pre-buried. The pile diameter is 500mm. The pile length is determined according to the soil conditions in different areas. The length is 10 to 15m. The pile spacing is 1.2m and arranged in a square shape. The second step is to stabilize the pile foundation. After the pile foundation is pre-buried, an extension rod is inserted into the installation hole. Then, a hydraulic extrusion device is used to push the extension rod through the installation hole and into the soil layer around the pile foundation. This allows the extension rod to be inserted around the pile foundation. This significantly improves the fixing effect of the pile foundation compared to the fixing method that relies solely on friction. The third step is pile foundation grouting. The steel cage is hoisted into the pile foundation through the lifting equipment, and then the grouting work is carried out. The grouting material is cement and water glass double liquid slurry, and the grouting pressure is 0.5 to 1.5 MPa. Step 4: Tank construction: Divide the sedimentation tank into 6 chambers, each with a plane size of 20m×20m. Set a 1000mm wide post-casting strip between adjacent chambers. Use the skipping method during construction, pouring concrete in chambers 1, 3, and 5 first, and then pouring concrete in chambers 2, 4, and 6 after a 10-day interval. 60 days after the concrete pouring on both sides is completed, the post-casting strip is poured with C40 slightly expansive concrete. The fifth step is to construct the detection optical fiber. A detection optical fiber is laid at the bottom of the sedimentation tank foundation along the circumference of the tank. The optical fiber is fixed by a combination of pasting and burying to ensure close coupling with the surrounding medium.

6. A method for controlling uneven sedimentation in a large water pool according to claim 5, characterized in that: During the first step of pre-embedding the pile foundation, it is necessary to monitor the verticality of the pile in real time by using a theodolite for measurement, and the verticality deviation is controlled within 1%; to monitor the pile diameter by using a steel ruler for measurement, the pile diameter deviation is controlled within ±20mm; to monitor the pile length by using the drill rod length marking method, the pile length deviation is controlled within ±100mm, and piles that do not meet the requirements are promptly supplemented.

7. A method for controlling uneven sedimentation in a large water pool according to claim 5, characterized in that: In the fourth step, during the construction of the pool, when pouring the post-cast strip, the concrete surface on both sides needs to be roughened to a depth of 5-10mm, the slurry and debris need to be removed, and the surface needs to be rinsed with water and kept moist for 24 hours. When pouring, an inserted vibrator is used to vibrate and compact the surface for 20-30 seconds to ensure good bonding between the post-cast strip and the concrete on both sides.

8. A method for controlling uneven sedimentation in a large water pool according to claim 5, characterized in that: The fifth step is to detect the construction of optical fiber; at the bottom of the pool, the optical fiber is pasted on the pre-laid 100mm thick C15 concrete cushion layer and protected with 50mm thick C20 fine stone concrete; inside the pool wall, the optical fiber is buried in the concrete protective layer with a thickness of 30mm, and the optical fiber is fixed with a steel support to prevent the optical fiber from shifting. Subsequently, a data acquisition system is established, and a distributed optical fiber demodulator is used for data acquisition with a sampling frequency of 1Hz. The data of the optical fiber sensor is collected in real time and transmitted to the data processing center for analysis. By establishing a settlement model, the strain data of the optical fiber is converted into actual settlement values.

9. A method for controlling uneven sedimentation in a large water pool according to claim 5, characterized in that: In the fifth step, during the optical fiber inspection construction, when the optical fiber inspection construction is completed and a sudden increase in the settlement rate in a certain area is detected, the foundation of the area should be grouting reinforced in time. The grouting material is cement-water glass double liquid slurry, the water-cement ratio of the cement slurry is 0.8, the modulus of water glass is 2.8, and the volume ratio of cement slurry to water glass is 1:0.

6. The grouting pressure is 1.0-1.5MPa. The grouting volume and pressure changes are monitored in real time during the grouting process. A total of 30-50m 3 , which can effectively control the development of settlement.

Images