Device and method for repairing filling body based on acoustic-thermal effect induced microbial nanomaterial

Abstract

The invention discloses a device and a method for restoring a filling body by inducing a microbial nanomaterial based on an acoustic-thermal effect, and relates to the technical field of filling mining. Crack repair is performed on the underground filling stope zone crack filling body through filling body reinforcement, acoustic-thermal synergy, microbial repair, multifunctional monitoring and visual regulation and control, flora diffusion distribution is monitored and regulated and controlled by adopting acoustic signals, and uniform distribution and activity enhancement of flora are realized. Meanwhile, it is guaranteed that the damaged filling body is efficiently repaired through the non-water-based nanometer material containing the microorganisms, and finally long-term stable bearing of the underground filling body is achieved; a distribution blind area is avoided, and the problem of secondary degradation of a filling body caused by a water-based grouting material is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of filling mining, and specifically to a device and method for repairing a filling body by inducing microbial nanomaterials based on the acoustic-thermal effect. Background Art

[0002] In a long-term stress and strain environment, mine roadways and stope filling bodies often crack or fail, resulting in a decline in their bearing capacity and posing potential safety hazards. Currently, most repair technologies use water-based grouting materials, but water-based grouting repair materials have problems such as secondary softening, poor fluidity control, and difficulty in solidification regulation. In recent years, microbial repair technology has been studied in the repair of rocks with fractured surfaces. Microbial mineralization technology can generate precipitates such as calcium carbonate through microbial metabolism in fractures or heterogeneous regions, with good self-repairability and long-term stability. However, the distribution and precipitation efficiency of existing microbial grouting repair technologies are controlled by complex conditions. If the microbial flora is unevenly dispersed in actual engineering, the repair efficiency of damaged filling bodies will be greatly reduced.

[0003] Patent CN113323441A discloses a method for improving the self-repair width of concrete cracks, mainly by adding homogeneous sand powder soaked in nutrient solution and bacterial liquid to the cracks to increase the self-repair width of concrete. First, add homogeneous sand powder soaked in nutrient solution to the cracks, and then add bacterial liquid. Through continuous metabolism of microorganisms, calcium carbonate is produced, and the continuous enrichment of calcium carbonate crystal ions makes the generated calcium carbonate act as a gelling material, ultimately achieving crack repair.

[0004] Patent CN112299767A discloses a cheap and efficient microbial self-repairing concrete and its preparation method. The crack self-repairing concrete uses aerobic alkaliphilic mixed bacteria with mineralization deposition characteristics as a self-repairing agent, and whey and calcium acetate as nutrients for the metabolism of the mixed bacteria. Through the calcium carbonate precipitation generated by the microbial self-repairing agent during metabolism, the concrete cracks are efficiently self-repaired, improving the crack self-repairing ability of the concrete during service, and thus improving the durability of the concrete.

[0005] Meanwhile, patent CN111155960B discloses a method for sealing boreholes for coal seam gas drainage based on the MICP technology. By filling a sealing material inside the borehole to form a closed space, and periodically injecting nutrient solution and microorganisms, a large amount of carbonate is generated through reaction to repair the cracks, thereby preventing air leakage during the extraction of high-concentration gas. This technology is difficult to control the uniform flow and diffusion of the nutrient solution and microorganisms. If the distribution is uneven, local solidification will occur, and the crack repair effect will be poor.

[0006] Patent CN107446917A discloses a regulation method for improving the activity of yeast. By setting electromagnetic waves with a certain frequency and collocating with a sonic device to conduct resonance stimulation on yeast, the cell osmotic energy driving force is improved, the cell activity is enhanced, and the in-vivo chemical decomposition and synthesis are promoted. The medium of this technology is a solution environment, similar to the transmission of sound waves in a homogeneous environment. However, underground rock formations, rocks, etc. are heterogeneous, and the internal pore-fracture structure of the filling body becomes more complex after being damaged, resulting in poor sound wave transmission effects in some areas.

[0007] In practical applications, there are still many challenges in the technical level of repairing fractured coal and rock masses or stope filling bodies under load conditions by injecting microbial-containing repair grouting materials. On the one hand, the internal structure of fractured coal, rock masses or filling bodies is relatively complex, making it difficult to achieve targeted and uniform distribution of the microbial population in the fracture surface area, resulting in low repair efficiency. It is easy to cause blind hole aggregation of the microbial population in the pores, and the distribution uniformity is poor. In this case, only some densely populated areas of the microbial population can form local fracture repair efficiency enhancement areas, and the overall fracture repair area is limited. There are still a large number of weak structural planes inside, resulting in the risk of instability of the coal and rock masses, which in turn affects the long-term stable bearing capacity of the filling body. On the other hand, traditional microbial solutions are all carried by water-based grouting materials, which are likely to cause secondary softening of the filling body (coal and rock masses) again. At the same time, water will trigger a series of water lock reactions, etc., affecting the fluidity of the repair material, making it difficult for the repair material to penetrate all fractures and weak structural interfaces. Along with the gradual solidification of the grouting repair material, there are many unrepaired areas, seriously affecting the overall bearing capacity of the filling body after repair. At the same time, the in-situ stress state underground will cause local closure of the grouting channels, further affecting the diffusion of the grouting material. Therefore, there are still bottlenecks that are difficult to overcome in improving the overall repair efficiency of the existing technology, and further innovation and optimization are needed. Summary of the Invention

[0008] The purpose of the present invention is to provide a device and method for repairing a filling body by inducing microbial nanomaterials based on the acoustic-thermal effect. To achieve the above purpose, the present invention provides the following technical solutions: A device for repairing a filling body by inducing microbial nanomaterials based on the acoustic-thermal effect includes a filling body. The bottom of the filling column is a bottom plate, and the top of the filling column is a top plate. There is an overlying rock formation forming a load on the top plate. Taking the center of the grouting repair area in the middle of the filling body as the center, grouting drill holes are arranged in the filling body in the way of deep and shallow holes. Sonic monitoring probes are evenly distributed on the filling body. Each grouting drill hole is connected to a non-aqueous nano repair material A storage tank and a non-aqueous nano material B storage tank through pipelines respectively. The non-aqueous nano repair material A storage tank is used to input non-aqueous nano materials mixed with a microbial population into the grouting drill holes. The non-aqueous nano material B storage tank is used to input non-aqueous nano materials mixed with a quick-setting agent into the grouting drill holes. The non-aqueous nano material contains acoustic nanoparticles. A sound-thermal combined control device is provided at the bottom of the grouting borehole; the sound-thermal combined control device includes a multi-frequency acoustic wave array, an acoustic field modulation module, an auxiliary heat source, and a multi-functional monitoring sensor; the multi-frequency acoustic wave array and the acoustic field modulation module are combined to generate low, medium, and high-frequency acoustic fields for promoting the uniform distribution of acoustic nanoparticles and accelerating the microbial mineralization reaction; the auxiliary heat source is used to promote the fluidity of non-aqueous nano materials.

[0009] Furthermore, the acoustic wave monitoring probe is connected to the ground monitoring center through an information transfer and processing interface to process the acoustic wave monitoring data for generating a three-dimensional fracture space model of the filling body.

[0010] Furthermore, the grouting boreholes are arranged in a diffusion circle or spider-web shape on the plane.

[0011] Furthermore, the non-aqueous nano repair material A storage tank is connected to a microbial storage tank and a non-aqueous nano material storage tank; the non-aqueous nano material B storage tank is connected to a quick-setting agent storage tank and is also connected to the non-aqueous nano material storage tank; valves are provided on the outlet pipelines of the non-aqueous nano repair material A storage tank and the non-aqueous nano material B storage tank.

[0012] A method for repairing a filling body by inducing microbial nano materials based on the sound-thermal effect, using the device for repairing a filling body by inducing microbial nano materials based on the sound-thermal effect, includes the following steps: S1. Open the valve at the outlet of the non-aqueous nano repair material A storage tank and inject the non-aqueous nano repair material A containing microbial flora into the filling body through each grouting borehole; S2. Turn on the sound-thermal combined control device at the bottom of the grouting borehole, apply a low-frequency acoustic field with a frequency of 0.1~10 kHz, and at the same time turn on the auxiliary heat source with its temperature set at 40℃~45℃ to promote the flow and diffusion of the non-aqueous nano repair material A. The acoustic field change data is synchronized to the ground monitoring center for monitoring until the non-aqueous nano repair material A is evenly distributed in the imaging area of the three-dimensional fracture space model and the flow imaging of the non-aqueous nano repair material A covers the three-dimensional fracture space model imaging. Then, turn off the auxiliary heat source and turn on the multi-functional monitoring sensor to monitor the pH value at the bottom position of each grouting borehole; S3. By adjusting the multi-frequency acoustic wave array and the acoustic field modulation module, apply a medium-frequency acoustic field with a frequency of 100 kHz~1 MHz. Under the action of the medium-frequency acoustic wave, the acoustic nanoparticles of the non-aqueous nano repair material A start to agglomerate to form microbial-induced particles; then, alternate the acoustic field between medium-frequency and low-frequency to achieve the uniform distribution of the microbial-induced particles; synchronously monitor the migration of the microbial flora through the multi-functional monitoring sensor until the microbial flora density points are uniform; S5. Adjust the multi-frequency acoustic wave array and the acoustic field modulation module again, set a high-frequency acoustic field with a frequency of 1 MHz to 10 MHz to promote the further growth of the microbial flora in the non-aqueous nano-repair material A and increase the repair activity of the flora. Synchronously control the ground monitoring center to connect to the multi-functional monitoring sensor to monitor the change in the distribution area of the microorganisms. When the distribution area of the microbial flora gradually decreases until it disappears, end the repair work of the fracture filling body; S6. Open the storage tank of the non-aqueous nano material B, backfill the grouting borehole with the non-aqueous nano material B, and completely generate the solidified body of the grouting material B.

[0013] Preferably, the time ratio of the alternating acoustic field conversion between the intermediate frequency and the low frequency is 2:1 to 3:1; the total is 3 to 5 h.

[0014] Preferably, in step S2, the pH range is 6.5 to 8.5.

[0015] Preferably, in step S5, after ending the repair work of the fracture filling body, let it stand for 2 to 3 days.

[0016] Preferably, the volume fraction of the acoustic nanoparticles is 10% to 30%, the initial particle size is 5 nm to 100 nm, and the particle size after aggregation into microbial-induced particles is 50 μm to 300 μm.

[0017] Preferably, the time for independently applying the low, medium, and high-frequency acoustic fields is 2 to 6 h.

[0018] The beneficial effects of the present invention compared with the prior art are as follows: 1. The present invention improves the fluidity of the non-aqueous nano material through the acoustic-thermal synergistic effect, promotes the uniform distribution of the grouting material, avoids the occurrence of distribution blind areas, and circumvents the problem of secondary deterioration of the filling body by the water-based grouting material. 2. The present invention uses the intermediate-frequency acoustic field to aggregate small-sized acoustic nanoparticles into large-sized microbial-induced particles, and at the same time plays a certain supporting role for the grouting channel, circumventing the shrinkage effect of the grouting channel caused by the creep effect under the action of the in-situ rock stress.

[0019] 3. The present invention realizes the uniform distribution of the microbial flora by synergistically regulating the distribution of the microbial-induced particles through the acoustic-thermal field, and realizes the acceleration of the multi-point mineralization repair. The metabolic activity of the flora is monitored by recording the change in the electrical signal, so as to flexibly regulate the diffusion range of the flora, and then realize the visual regulation of its diffusion process.

[0020] 4. Under the multi-stage synergistic action of the acoustic-thermal field, the present invention improves the transmission of nutrients in the fracture, promotes the proliferation of microorganisms, provides additional metabolic substrates for the microorganisms, accelerates the decomposition and mineralization of the mineralization raw materials, and at the same time the acoustic field regulation can promote the rapid transfer of the induced particles and the flora, and accelerate the repair efficiency of the filling body. Description of the Drawings

[0021] Figure 1 Figure 1 is the overall schematic diagram of the device for inducing microbial nanomaterials to repair the filling body based on the acoustic-thermal effect; Figure 2 Figure 2 Figure 1 is the left view of the grouting borehole in Figure 2; Figure 3 Figure 3 is the schematic diagram of the spider-web distribution of the grouting boreholes; Figure 4 Figure 4 is the distribution diagram of the acoustic wave probes; Figure 5 Figure 5 is the lateral sectional schematic diagram of the arrangement of the grouting boreholes and the distribution of the acoustic wave probes; Figure 6 Figure 6 is the front sectional schematic diagram of the arrangement of the grouting boreholes and the distribution of the acoustic wave probes; Figure 7 Figure 7 is the schematic diagram of increasing permeability by the acoustic-thermal effect; Figure 8 Figure 8 is the schematic diagram of the fracture space model in the state without injecting the filling material; Figure 9 Figure 9 is the schematic diagram of the stage of promoting the uniform diffusion of slurry A by the low-frequency sound field-assisted heating; Figure 10 Figure 10 is the schematic diagram of the stage of inducing particle generation, uniform distribution and microbial adsorption and migration by the medium-low frequency variable sound field; Figure 11 Figure 11 is the schematic diagram of the stage of microbial proliferation, activation and mineralization under the action of the high-frequency sound field; Figure 12 Figure 12 is the schematic diagram of the stage of microbial-enhanced mineralization backfilling and grouting boreholes under the action of the acoustic-thermal field.

[0022] In the figures: 1. Overlying strata; 2. Roof; 3. Filling column; 4. Floor; 5. Grouting borehole; 6. Acoustic wave monitoring probe; 7. Information transfer and processing interface; 8. Ground monitoring center; 9. Acoustic-thermal combined control device; 901. Multi-frequency acoustic wave array; 902. Sound field modulation module; 903. Auxiliary heat source; 904. Multi-functional monitoring sensor; 906. Thermal surge effect; 10. Three-dimensional fracture space model; 11. Microbial storage tank; 12. Non-aqueous nanomaterial storage tank; 13. Accelerator storage tank; 14. Non-aqueous nano repair material A storage tank; 1401. Non-aqueous nano repair material A; 1403. Solidified block of grouting material A; 1501. Non-aqueous nanomaterial B storage tank; 1503. Solidified body of grouting material B; 16. Microbial flora; 17. Microbial-induced particles; 1701. Acoustic nanoparticles; 18. Blank area; 19. Slurry flow intersection area. Detailed Description of the Invention

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail in combination with embodiments and drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solutions of the present invention will be described in detail below in combination with embodiments and drawings, but the protection scope is not limited by this.

[0024] A device and method for repairing a fractured filling body with a non-aqueous nano material containing microorganisms assisted by the acousto-thermal effect controls the uniform diffusion form of the non-aqueous acoustic nano repair material and the microbial flora through a sound field, eliminates the repair blind area, greatly improves the repair efficiency of the filling body, avoids the influence of stress conditions and secondary deterioration, and finally realizes the stable bearing of the filling body.

[0025] Embodiment 1 Refer to Figures 1 to 12 , this embodiment proposes a device for repairing a filling body with a microbial nano material induced by the acousto-thermal effect, including a filling body 3. The bottom of the filling column 3 is a bottom plate 4, and the top of the filling column 3 is a top plate 2. There is an overlying rock stratum 1 forming a load on the top plate 2. Taking the middle part of the filling body 3 as the center of the grouting repair area, grouting drill holes 5 are arranged in the filling body 3 in the way of deep and shallow holes. The grouting drill holes 5 are distributed in a diffusion circle or spider web shape on the plane. The spacing between the diffusion circles of the grouting drill holes 5 is 0.5 - 6m, and the depth of the grouting drill holes 5 is 0 - 1.5m near the pore fracture surface.

[0026] Among them, the deep and shallow holes of the grouting drill holes 5 are set with the middle part as the center. When spreading to the surrounding, interval deep and shallow holes can also be set. In necessary cases, flush holes can be set, and adjusted according to the fracture space to ensure good diffusion effect of the filling material.

[0027] Diagonal (multi-row - multi-column) acoustic monitoring probes 6 are arranged on the filling body 3, with the row and column spacing of 1 - 3m. The acoustic wave is emitted to the fractured filling body 3 through multi-point acoustic monitoring for omnidirectional monitoring. The acoustic monitoring probes 6 are connected to the ground monitoring center 8 through the information transfer and processing interface 7 to process the acoustic monitoring data, which is used to generate the three-dimensional fracture space model 10 of the filling body 3 to accurately identify the fractures, heterogeneous regions and their position and size distributions in the filling body 3. Among them, the acoustic monitoring probes 6 emit acoustic waves with a frequency of 1 - 100Hz. Among them, the frequency within 10Hz measures medium and small-sized fractures, and the calculated wave velocity range is 0 - 7000m / s, which can identify the internal fracture space structure of the filling body 3.

[0028] Each grouting borehole 5 is respectively connected to a non-aqueous nano repair material A storage tank 14 and a non-aqueous nano material B storage tank 15 through pipelines; the non-aqueous nano repair material A storage tank 14 is connected to a microorganism storage tank 11 and a non-aqueous nano material storage tank 12; the non-aqueous nano material B storage tank 15 is connected to a quick-setting agent storage tank 13 and is also connected to the non-aqueous nano material storage tank 12; valves are provided on the outlet pipelines of the non-aqueous nano repair material A storage tank 14 and the non-aqueous nano material B storage tank 15; a microorganism flora 16 is placed in the microorganism storage tank 11, and the microorganism flora 16 is selected from carbonate mineralization strains, such as alkaliphilic bacteria, ammonia-philic bacteria, etc., and the microorganism concentration in the mixed slurry is 10 6 ~ 10 8 CFU / mL.

[0029] A non-aqueous nano material is placed in the non-aqueous nano material storage tank 12, using organic solvents such as alcohols or ketones as carriers, containing acoustic nanoparticles 1701, nutrients (urea, ordinary sugar, etc.), calcium nitrate or calcium sulfate, etc. Among them, the acoustic nanoparticles 1701 are selected from coated nano-calcium, nano-ferrite, etc., and can migrate and aggregate under the action of the sound field to generate microorganism-induced particles 17. The volume fraction of the acoustic nanoparticles 1701 is 10~30%, the initial particle size is 5nm~100nm, and the particle size after aggregating into microorganism-induced particles 17 is 50um to 300um. In addition to inducing the aggregation of microorganisms, it plays a role in supporting the grouting channel, and at the same time, it generates heat under the action of low-frequency sound waves to further promote the migration of the induced particles.

[0030] A sound-thermal combined control device 9 is provided at the bottom of the grouting borehole 5; The sound-thermal combined control device 9 includes four parts: a multi-frequency sound wave array 901, a sound field modulation module 902, an auxiliary heat source 903, and a multi-functional monitoring sensor 904, all of which are connected to the ground monitoring center 8 synchronously. The combination of the multi-frequency sound wave array 901 and the sound field modulation module 902 can generate low, medium, and high-frequency sound fields. The three sound field frequencies are 0.1~10kHz, 100kHz~1MHz, and 1MHz~10MHz respectively. Each stage of the sound field is applied for 2~6h. The low-frequency sound field generates a directional eddy current to reduce the viscosity of the non-aqueous material and at the same time promotes the uniform distribution of the nanoparticles; the medium-frequency sound field induces particle aggregation, adsorbs negatively charged microorganisms through electrostatic action, further ensures the uniformity of the microorganisms, and at the same time plays a role in supporting the grouting channel and resisting the compression effect of the in-situ stress; the high-frequency sound field accelerates the microbial mineralization reaction and accelerates the decomposition of reaction sources such as Ca + ions, etc.

[0031] The maximum temperature of the auxiliary heat source 903 is between 40℃ and 45℃, that is, a temperature difference is generated from the injection port to the distal low-temperature crack ΔT generates a thermal surge effect 906, further promoting the fluidity of the non-aqueous material; the multi-functional monitoring sensor 904 monitors multiple aspects, respectively monitoring the particle distribution density, microbial distribution, and real-time pH value through acoustic signals, multi-functional monitoring signals, etc. The monitoring data is synchronized with the ground monitoring center 8. The pH setting range is 6.5 - 8.5. When the mineralization reaction proceeds to a certain extent, a small amount of acid (such as hydrochloric acid) or base (such as calcium hydroxide) is added externally as needed to adjust the pH, ensuring the efficient progress of the microbial mineralization reaction.

[0032] The multi-frequency acoustic wave array 901 and the acoustic field modulation module 902 cooperate to adjust the acoustic field intensity. During the process of microbial-induced particle aggregation in the intermediate-frequency acoustic field, through cyclic alternation, the "aggregation - dispersion" process can be cycled in complex fractures, h 中频 : h 低频 = 2:1 - 3:1, (h is time); a total of 3 - 5h, gradually optimizing the distribution until the image displayed by the ground monitoring center 8 shows that the size and area of the density points are basically stable.

[0033] The medium-high frequency acoustic field of 1 - 10 MHz excites the local heat generation of the acoustic nanoparticles 1701, accelerating the decomposition of urea and the source of the mineralization reaction Ca + in the non-aqueous material, stimulating the activity of microorganisms, and promoting the efficient progress of the repair. The following are the relevant mineralization reaction formulas: Example 2 This example proposes a method for repairing a filling body using a sound-thermal effect-induced microbial nanomaterial. The repair object is the filling column 3 of a certain key bearing damaged cube with a height of 5m, a length of 5m, and a width of 5m; the bottom of the filling column 3 is the floor 4, the top of the filling column 3 is the roof 2, and there is an overlying rock formation 1 forming a load on the roof 2; a device for repairing a filling body using a sound-thermal effect-induced microbial nanomaterial as described in Example 1.

[0034] See Figure 1 、 Figure 2 、 Figures 4 to 12 , and the specific implementation steps are as follows: S1. Set 3×3 acoustic wave monitoring probes 6 on both sides of the filling body 3, with a row and column spacing of 2m. The acoustic wave is emitted to the fractured filling body 3 through multi-point acoustic wave monitoring for omnidirectional monitoring. The acoustic wave monitoring probe 6 is connected to the ground monitoring center 8 through the information transfer and processing interface 7, and the acoustic wave monitoring data can be processed to generate a three-dimensional fracture space model 10 of the filling body 3, identifying that the fractures and inhomogeneous regions in the filling body 3 are basically located in the region of 3m×4m×4m in the middle of the filling body 3.

[0035] S2. Taking the middle part of the filling body 3 as the center of the grouting repair area, drill holes in the filling body 3 in the arrangement mode of deep and shallow holes. The drill hole arrangement presents a diffusion circle distribution on the plane (see Figure 2). The distance between two adjacent grouting drill holes 5 in the diffusion circle is 2 m. The deepest grouting drill hole 5 (i.e., the drill hole located at the center of the diffusion circle) is 0.5 m deep in the hole fracture surface, and the shallowest grouting drill hole 5 (i.e., the drill hole located on the outermost circle of the diffusion circle) is 0.5 m shallow in the hole fracture surface. Connect all the grouting drill holes 5 to the non-aqueous nano repair material A storage tank 14 through pipelines. The non-aqueous nano repair material A storage tank 14 is respectively connected to the microorganism storage tank 11 and the non-aqueous nano material storage tank 12. Open the valve at the outlet of the non-aqueous nano repair material A storage tank 14, and inject the non-aqueous nano repair material A1401 containing the microbial flora 16 into the filling body 3 through each grouting drill hole 5. S3. Turn on the sound-thermal combined control device 9 at the bottom of the grouting drill hole 5, modulate the low-frequency sound field with a frequency of 80 kHz. At the same time, turn on the auxiliary heat source 903 with its temperature set at 40 °C and the working time set at 3 h to promote the flow and diffusion of the non-aqueous nano repair material A1401. The sound field change data is synchronized to the ground monitoring center 8 for monitoring until the non-aqueous nano repair material A1401 is evenly distributed in the imaging area of the three-dimensional fracture space model 10, and the flow imaging of the non-aqueous nano repair material A1401 basically covers the imaging of the three-dimensional fracture space model 10, that is, the slurry flow intersection area 19 gradually replaces the blank area 18 in the fracture. Synchronously turn off the auxiliary heat source 903, and turn on the multi-functional monitoring sensor 904 to immediately monitor the pH value at the bottom position of each grouting drill hole 5 to ensure that the pH value fluctuates between 7 and 8.

[0036] S4. By adjusting the multi-frequency acoustic wave array 901 and the sound field modulation module 902, apply a medium-frequency sound field for 2 h with a frequency of 500 kHz. Under the action of the medium-frequency acoustic wave, promote the acoustic nanoparticles 1701 of the non-aqueous nano repair material A1401 to start aggregating to form microbial-induced particles 17. Wait until the microbial-induced particles 17 are gradually formed, and perform alternating sound field conversion with 30 min of medium frequency and 15 min of low frequency for a total of 3 h to achieve the uniform distribution of the microbial-induced particles 17. Synchronously monitor the migration of the microbial flora 16 through the multi-functional monitoring sensor 904 until the microbial colony density points are relatively uniform.

[0037] S5. Readjust the multi-frequency acoustic wave array 901 and the sound field modulation module 902 again. Set the high-frequency sound field with a frequency of 3 MHz to promote the further growth of the number of microbial flora 16 in the non-aqueous nano-repair material A1401 and increase the repair activity of the flora. When the repair of pores and fissures is basically completed, synchronously control the ground monitoring center 8 to connect the multi-functional monitoring sensor 904 to monitor the change in the distribution area of microorganisms. When the distribution area of the microbial flora 16 gradually decreases until it disappears, end the repair work of the fissure filling body, and let it stand for 2 days to form the solidified block 1403 of the grouting material A.

[0038] S6. Backfill the grouting borehole 5 through the non-aqueous nano-material B storage tank 1501. Wait for it to stand for 1 day to completely generate the solidified body 1503 of the grouting material B. Then, use the acoustic wave monitoring probe 6 to monitor the repaired filling body 3 in all directions again. The maximum difference after repair in the initial pore and fissure space and the surrounding area is 100 m / s, and the repair work is completed.

[0039] Select matrix points of j×k×l from the repaired area of the fissure space and the surrounding area, and monitor the wave velocity of each point in real time as v 111 、…、 v jkl . Through the numerical values of the position points, a two-dimensional and three-dimensional cloud map can be constructed. The maximum difference Δ v = v max - v min . The difference range is 0 - 100 m / s, which proves that the wave velocity cloud map is relatively uniform and the repair effect is good.

[0040] Example 3 This example proposes a method for repairing a filling body based on acoustic-thermal effect-induced microbial nano-materials. The repair object is a certain key bearing damaged non-cubic filling column 3 with a height of 6 m, a length of 11 m, and a width of 12 m. The bottom of the filling column 3 is the floor 4, the top of the filling column 3 is the roof 2, and there is an overlying stratum 1 forming a load on the roof 2; a device for repairing a filling body based on acoustic-thermal effect-induced microbial nano-materials as described in Example 1.

[0041] See Figure 1 、 Figures 3 to 12 . The specific implementation steps are as follows: S1. Along the length direction, acoustic monitoring probes 6 arranged in rows and columns of 4×2 are set on both sides of the filling body 3, with row and column spacings of 3×2.5 m. Sound waves are emitted to the fractured filling body 3 through multi-point acoustic monitoring for omnidirectional monitoring. The acoustic monitoring probes 6 are connected to the ground monitoring center 8 through the information transfer and processing interface 7, and the acoustic monitoring data can be processed to generate a three-dimensional fracture space model 10 of the filling body 3, identifying the fractures and inhomogeneous regions within the filling body 3.

[0042] S2. Taking the middle part of the filling body 3 as the center of the grouting repair area, the filling body 3 is drilled using the arrangement method of deep and shallow holes. The drilling layout presents a spider web distribution on the plane (see Figure 3 ). The spacing between each grouting drill hole 5 is about 3 m. The deepest grouting drill hole 5 is located 1 m deep in the hole fracture surface, and the shallowest grouting drill hole 5 is located 1 m shallow in the hole fracture surface. All the grouting drill holes 5 are connected to the non-aqueous nano repair material A storage tank 14 through pipelines. The non-aqueous nano repair material A storage tank 14 is respectively connected to the microorganism storage tank 11 and the non-aqueous nano material storage tank 12. The valve at the outlet of the non-aqueous nano repair material A storage tank 14 is opened, and the non-aqueous nano repair material A1401 containing the microbial flora 16 is injected into the filling body 3 through each grouting drill hole 5. S3. The acoustic-thermal combined control device 9 at the bottom of the grouting drill hole 5 is turned on to modulate a low-frequency sound field with a frequency of 50 kHz. At the same time, the auxiliary heat source 903 is turned on, with its temperature set at 45 °C and the working time set at 4 h, to promote the flow and diffusion of the non-aqueous nano repair material A1401. The sound field change data is synchronized to the ground monitoring center 8 for monitoring until the non-aqueous nano repair material A1401 is evenly distributed in the imaging area of the three-dimensional fracture space model 10, and the flow imaging of the non-aqueous nano repair material A1401 basically covers the imaging of the three-dimensional fracture space model 10, that is, the slurry flow intersection area 19 gradually replaces the blank area 18 in the fracture. The auxiliary heat source 903 is synchronously turned off, and the multi-functional monitoring sensor 904 is turned on to immediately monitor the pH value at the bottom position of each grouting drill hole 5, ensuring that the pH value fluctuates between 7 and 8.

[0043] S4. By adjusting the multi-frequency acoustic wave array 901 and the sound field modulation module 902, a medium-frequency sound field with a frequency of 100 kHz is applied for 2 h. Under the action of the medium-frequency sound waves, the acoustic nanoparticles 1701 of the non-aqueous nano repair material A1401 begin to agglomerate to form microbial-induced particles 17. When the microbial-induced particles 17 are gradually formed, the sound field is alternately switched between medium frequency for 30 min and low frequency for 15 min, for a total of 4 h, to achieve the uniform distribution of the microbial-induced particles 17. The migration of the microbial flora 16 is synchronously monitored through the multi-functional monitoring sensor 904 until the microbial colony density points are relatively uniform.

[0044] S5. Adjust the multi-frequency acoustic wave array 901 and the sound field modulation module 902 again. Set the high-frequency sound field with a frequency of 3.5 MHz to promote the further growth of the number of microbial flora 16 in the non-aqueous-based nano-repair material A1401, and increase the repair activity of the flora. When the repair of pores and fissures is basically completed, synchronously control the ground monitoring center 8 to connect the multi-functional monitoring sensor 904 to monitor the change in the distribution area of microorganisms. When the distribution area of the microbial flora 16 gradually decreases until it disappears, end the repair work of the fissure filling body, and let it stand for 2 days to form the solidified block 1403 of the grouting material A.

[0045] S6. Backfill the grouting borehole 5 through the non-aqueous-based nano-material B storage tank 1501. Wait for it to stand for 1 day to completely generate the solidified body 1503 of the grouting material B. Then, use the acoustic wave monitoring probe 6 to conduct a full-range monitoring of the repaired filling body 3 again. When the maximum difference after repair in the initial pore-fissure space and the surrounding area is 100 m / s, the repair work is completed.

[0046] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific embodiments of the present invention are limited thereto. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the premise of the present invention, several simple deductions or substitutions can still be made, which should all be regarded as belonging to the patent protection scope determined by the claims submitted for the present invention.

Claims

1. A device for repairing a filling body by inducing microbial nanomaterials based on the acoustic-thermal effect, comprising a filling body (3), the bottom of the filling column (3) being a bottom plate (4), the top of the filling column (3) being a top plate (2), and an overlying rock layer (1) forming a load on the top plate (2); characterized in that: The middle of the filling body (3) is taken as the center of the grouting repair area, and grouting boreholes (5) are arranged in the filling body (3) in the form of deep and shallow holes; acoustic wave monitoring probes (6) are evenly distributed on the filling body (3); each grouting borehole (5) is connected to a non-aqueous nano-repairing material A storage tank (14) and a non-aqueous nano-repairing material B storage tank (15) through a pipeline; the non-aqueous nano-repairing material A storage tank (14) is used to input a non-aqueous nano-material mixed with a microbial flora (16) into the grouting borehole (5); the non-aqueous nano-material B storage tank (15) is used to input a non-aqueous nano-material mixed with an accelerator into the grouting borehole (5); and the non-aqueous nano-material contains acoustic nano-particles (1701); A sound-heat combination control device (9) is arranged at the bottom of the grouting borehole (5); the sound-heat combination control device (9) comprises a multi-frequency sound wave array (901), a sound field modulation module (902), an auxiliary heat source (903), and a multifunctional monitoring sensor (904); the multi-frequency sound wave array (901) and the sound field modulation module (902) are combined to generate low, medium, and high frequency sound fields for promoting uniform distribution of acoustic nanoparticles (1701) and accelerating microbial mineralization reactions; the auxiliary heat source (903) is used to promote the fluidity of non-aqueous nanomaterials.

2. The device for repairing a filling body by inducing microbial nanomaterials based on the acoustic-thermal effect according to claim 1 is characterized in that: The acoustic wave monitoring probe (6) is connected to a ground monitoring center (8) via an information transfer processing interface (7) to process the acoustic wave monitoring data for generating a three-dimensional fracture space model (10) of the filling body (3).

3. The device for repairing a filling body by inducing microbial nanomaterials based on the acoustic-thermal effect according to claim 1 is characterized in that: The grouting holes (5) are arranged in a plane in a diffusion circle or spider web-like distribution.

4. The device for repairing a filling body by inducing microbial nanomaterials based on the acoustic-thermal effect according to claim 1 is characterized in that: The non-aqueous nano-repairing material A storage tank (14) is connected to the microorganism storage tank (11) and the non-aqueous nano-material storage tank (12); the non-aqueous nano-material B storage tank (15) is connected to the quick-setting agent storage tank (13) and is also connected to the non-aqueous nano-material storage tank (12); valves are provided on the outlet pipelines of the non-aqueous nano-repairing material A storage tank (14) and the non-aqueous nano-material B storage tank (15).

5. A method for repairing a filling body by inducing microbial nanomaterials based on the acoustic-thermal effect, characterized in that: The device for repairing a filling body by using microbial nanomaterials induced by acoustic-thermal effect as described in any one of claims 1 to 4 comprises the following steps: S1, opening the valve at the outlet of the non-aqueous nano-repairing material A storage tank (14), and injecting the non-aqueous nano-repairing material A (1401) containing the microbial flora (16) into the filling body (3) through each grouting borehole (5); S2, turning on the acoustic-thermal combination control device (9) at the bottom of the grouting borehole (5), applying a low-frequency acoustic field with a frequency of 0.1-10 kHz, and simultaneously turning on the auxiliary heat source (903), with its temperature set at 40°C-45°C, to promote the flow and diffusion of the non-aqueous nano-repairing material A (1401), and synchronously transmitting the acoustic field change data to the ground monitoring center (8) for monitoring until the non-aqueous nano-repairing material A (1401) is evenly distributed in the imaging area of ​​the three-dimensional fracture space model (10), and the flow imaging of the non-aqueous nano-repairing material A (1401) covers the imaging of the three-dimensional fracture space model (10), and synchronously turning off the auxiliary heat source (903), and turning on the multifunctional monitoring sensor (904) to monitor the pH value at the bottom of each grouting borehole (5); S3, by adjusting the multi-frequency sound wave array (901) and the sound field modulation module (902), a medium frequency sound field is applied with a frequency of 100kHz~1MHz, and under the action of the medium frequency sound wave, the acoustic nanoparticles (1701) of the non-aqueous nano-repair material A (1401) begin to aggregate to form microbial induced particles (17); then, the sound field is alternately converted with the medium frequency and the low frequency to achieve uniform distribution of the microbial induced particles (17); and the migration of the microbial flora (16) is simultaneously monitored by the multifunctional monitoring sensor (904) until the flora density is uniform; S5, adjusting the multi-frequency sound wave array (901) and the sound field modulation module (902) again, setting a high-frequency sound field with a frequency of 1 MHz to 10 MHz to promote the further growth of the number of microbial flora (16) in the non-aqueous nano-repair material A (1401), and increase the repair activity of the flora, and synchronously controlling the ground monitoring center (8) to connect the multi-functional monitoring sensor (904) to monitor the change of the microbial distribution area, and when the distribution area of ​​the microbial flora (16) gradually decreases until it disappears, the repair work of the fracture filling body is ended; S6. Open the non-aqueous nanomaterial B storage tank (15), backfill the grouting borehole (5) with the non-aqueous nanomaterial B (1501), and completely generate a solidified body of the grouting material B (1503).

6. The method for repairing a filling body by using microbial nanomaterials induced by acoustic-thermal effect according to claim 5, characterized in that: The time ratio of alternating sound field conversion between medium frequency and low frequency is 2:1~3:1; the total time is 3~5 hours.

7. The method for repairing a filling body by using microbial nanomaterials induced by acoustic-thermal effect according to claim 5, characterized in that: In step S2, the pH range is 6.5-8.

5.

8. The method for repairing a filling body by using microbial nanomaterials induced by acoustic-thermal effect according to claim 5, characterized in that: In step S5, after the repair work of the fracture filling body is completed, it is left to stand for 2 to 3 days.

9. The method for repairing a filling body by using microbial nanomaterials induced by acoustic-thermal effect according to claim 5, characterized in that: The volume fraction of acoustic nanoparticles (1701) is 10-30%, the initial particle size is 5nm-100nm, and the particle size after aggregation into microbial induced particles (17) is 50um-300um.

10. The method for repairing a filling body by using microbial nanomaterials induced by acoustic-thermal effect according to claim 5, characterized in that: The low, medium and high frequency sound fields are applied independently for 2 to 6 hours.

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